Preparation method of an electro-driven piezoelectric catalytic electrode and method for deep dehydration of organic solid waste using the same

Abstract

The present invention discloses a preparation method of an electro-driven piezoelectric catalytic electrode and a method for deep dehydration of organic solid waste using the same. The preparation method of the electro-driven piezoelectric catalytic electrode for deep dehydration of organic solid waste disclosed by the present invention comprises the following steps: S1. Mixing a molybdenum source, a sulfur source and a solvent and performing a solvothermal reaction to obtain a MoS 2 -based piezoelectric material; the MoS 2 -based piezoelectric material includes any one of MoS 2 piezoelectric material, sulfur-rich defect MoS 2 piezoelectric material, molybdenum-rich defect MoS 2 piezoelectric material; S2. Mixing the MoS 2 -based piezoelectric material, a titanium-based ruthenium-iridium electrode and water and performing a hydrothermal reaction to obtain the product. By utilizing the strong piezoelectric performance of MoS 2 , the present invention can regulate the Zeta potential at the interface between the organic solid waste and the solution and destroy the extracellular polymer structure on the surface of the organic solid waste without adding chemical agents, release the bound water and interstitial water, and achieve the purpose of deep dehydration of the organic solid waste, providing an efficient solution for the deep dehydration of organic solid wastes such as kitchen waste, river-lake bottom mud, and engineering slurry.

Description

Technical Field

[0001] The present invention belongs to the technical field of deep dehydration and volume reduction of organic solid waste, and more specifically, relates to a method for deep dehydration of organic solid waste, a piezoelectric catalytic electrode used therefor, and a preparation method of the electrode. Background Art

[0002] Reducing the moisture content of organic solid waste, especially enhancing the deep dehydration ability of organic solid waste, is a key issue that urgently needs to be broken through in solid waste volume reduction in China. Traditional dehydration technologies have strong removal ability for free water with weak binding ability, but the removal effect on bound water and interstitial water with strong binding ability is not ideal. Therefore, developing new technologies for deep dehydration of organic solid waste has extremely important practical significance.

[0003] Piezoelectric dehydration is a new dehydration technology that uses the piezoelectric effect to generate a polarization electric field, destroy extracellular polymers, release bound water, and achieve deep dehydration of river and lake bottom mud. Currently, the reports related to piezoelectric dehydration mainly focus on barium titanate, but it has problems such as the need for chemical agents (promoters, flocculants, and coagulants, etc.) in composite piezoelectric catalytic materials (201911289167.3, 202010972300.1, Water Res. , 209 (2022) 117922) or harsh operating conditions (202311791903.1, Nat. Commun. 15 (2024) 4845), etc.

[0004] The piezoelectric effect is a physical phenomenon, which means that under the action of an external stress, the deformation of a piezoelectric material will cause the material to undergo spontaneous polarization, form a built-in electric field, and induce charges on the surface of the material. When a piezoelectric material deforms to generate a built-in electric field, its energy band structure changes, so that the material has catalytic activity. MoS 2 has a two-dimensional S-Mo-S layered structure, and the layers are attracted to each other by van der Waals forces. Currently, there are no reports on using the piezoelectric properties of MoS 2 for the deep dehydration of organic solid waste. Summary of the Invention

[0005] The purpose of the present invention is to provide a method for deep dehydration and volume reduction of organic solid waste, an electro-driven piezoelectric catalytic electrode material used therefor, and a preparation method thereof. This method utilizes the strong piezoelectric properties of MoS 2 to achieve the purpose of regulating the Zeta potential at the interface of organic solid waste and solution, destroying the extracellular polymer structure on the surface of organic solid waste, releasing bound water and interstitial water, and achieving deep dehydration of organic solid waste without adding chemical agents, thereby solving the technical problem of difficult deep dehydration of organic solid waste.

[0006] To achieve the above purpose, the present invention adopts the following technical solutions:

[0007] In a first aspect, the present invention provides a method for preparing an electro-driven piezoelectric catalytic electrode for deep dehydration of organic solid waste, comprising the following steps:

[0008] S1. Mix a molybdenum source, a sulfur source and a solvent and carry out a solvothermal reaction to obtain a MoS 2 -based piezoelectric material;

[0009] The MoS 2 -based piezoelectric material includes any one of MoS 2 piezoelectric material, sulfur-rich defect MoS 2 piezoelectric material, molybdenum-rich defect MoS 2 piezoelectric material;

[0010] S2. Mix the MoS 2 -based piezoelectric material, a titanium-based ruthenium-iridium electrode and water and carry out a hydrothermal reaction to obtain the electro-driven piezoelectric catalytic electrode for deep dehydration of organic solid waste.

[0011] In the above method for preparing an electro-driven piezoelectric catalytic electrode for deep dehydration of organic solid waste, the addition amounts of the molybdenum source and the sulfur source are controlled such that the molar ratio of molybdenum to sulfur is (0.2 - 2.0):1;

[0012] The molybdenum source is one of sodium molybdate and ammonium molybdate;

[0013] The sulfur source is one of sulfur powder, thiourea, thioacetamide, thiol, L-cysteine, and sodium sulfate;

[0014] The solvent is water or an aqueous solution of ethanol; as an example, the mass concentration of the aqueous solution of ethanol is 10%;

[0015] As an example, the mass-volume ratio of the sulfur source to the solvent is 1.2 g:60 mL.

[0016] In the above method for preparing an electro-driven piezoelectric catalytic electrode for deep dehydration of organic solid waste, the solvothermal reaction is carried out in a reaction kettle, the reaction temperature is 180°C - 220°C, the reaction time is 18 - 24 h, and preferably the reaction is carried out at 220°C for 22 - 24 h;

[0017] The method further includes a step of vacuum drying the product after the solvothermal reaction.

[0018] In the above method for preparing an electro-driven piezoelectric catalytic electrode for deep dehydration of organic solid waste, for every 50 × 50× 0.1 mm 3 the titanium-based ruthenium-iridium electrode is mixed with 0.5 - 2.5 g of the MoS 2 -based piezoelectric material; preferably, for every 50 × 50× 0.1 mm 3The titanium-based ruthenium-iridium electrode is mixed with 2.5 g of the 2 MoS-based piezoelectric material.

[0019] In the above preparation method of the electro-driven piezoelectric catalytic electrode for deep dehydration of organic solid waste, the hydrothermal reaction is carried out in a reaction kettle at a temperature of 180°C to 220°C and a reaction time of 12 to 16 h;

[0020] The method further includes a step of drying the product after the hydrothermal reaction.

[0021] In a second aspect, the present invention provides a piezoelectric catalytic electrode for deep dehydration of organic solid waste obtained by the preparation method described in any one of the above.

[0022] In a third aspect, the present invention provides a method for deep dehydration of organic solid waste, including the following steps:

[0023] Using the electro-driven piezoelectric catalytic electrode for deep dehydration of organic solid waste as the anode plate and the cathode plate respectively, and using the organic solid waste to be treated as the electrolyte, applying a voltage can achieve deep dehydration of the organic solid waste.

[0024] Based on the above technical solutions, the present invention prepares a nano-flower-like MoS 2 piezoelectric material with strong piezoelectric response ability and rich edge defect structure through directional regulation, and composits it with a commercial titanium-based ruthenium-iridium electrode to prepare a piezoelectric catalytic electrode material. On this basis, through an electrocatalytic system, the Zeta potential at the interface between the organic solid waste and the solution is effectively regulated, the extracellular polymer structure on the surface of the organic solid waste is destroyed, the bound water and interstitial water are released, and the efficiency of deep dehydration and reduction of the organic solid waste is improved, having good market application potential.

[0025] In the above method for deep dehydration of organic solid waste, the organic solid waste comes from one or more of kitchen waste, river and lake bottom mud, and engineering slurry;

[0026] The moisture content of the organic solid waste is 40% to 60%.

[0027] In the above method for deep dehydration of organic solid waste, the distance between the anode plate and the cathode plate is 1 to 5 cm.

[0028] In the above method for deep dehydration of organic solid waste, the electrolysis treatment adopts the following mode 1) or mode 2):

[0029] 1) Constant voltage mode, the voltage intensity is 0.50 to 1.25 V, preferably 0.75 to 1 V, and the running time is 5 to 10 min, preferably 5 min;

[0030] 2) Pulse voltage mode, with a voltage intensity of ±1 V, a pulse period of 10 s, a running time of 5 - 10 min, preferably 8 min.

[0031] The basic principle and advantages of the present invention: The piezoelectric catalytic electrode material is composed of nano - flower - shaped MoS with a defective structure 2 piezoelectric material and a commercial titanium - based ruthenium - iridium electrode compounded. By regulating the molybdenum - sulfur molar ratio, MoS piezoelectric materials with rich - molybdenum defects and rich - sulfur defects are constructed 2 piezoelectric materials, especially MoS piezoelectric materials with rich - molybdenum defects 2 piezoelectric materials, improve the self - polarization performance of the piezoelectric material under the drive of an electric field, and generate a piezoelectric local amplification effect at the defective structure, enhancing the piezoelectric electric field and the residual electric field intensity, promoting the generation of active species. Without adding chemical agents, it can adjust the Zeta potential at the interface between the organic solid waste and the solution, destroy the extracellular polymer structure on the surface of the organic solid waste, release bound water and interstitial water, and improve the efficiency of deep dehydration and volume reduction of the organic solid waste. The overall moisture content of the organic solid waste is further reduced from 40% - 60% to 30.7% - 46.3%, and the deep dehydration efficiency is as high as 9.3% - 13.7%. This technical solution has the advantages of low cost and energy consumption, no risk of secondary pollution, and simple device and easy implementation, providing an efficient solution for the deep dehydration of organic solid waste, and can be used for the deep dehydration of organic solid wastes such as kitchen waste, river and lake bottom mud, and engineering mud. Brief Description of the Drawings

[0032] By reading the following detailed description of the preferred embodiments, various other advantages and benefits will become clear to those of ordinary skill in the art. The drawings are only for the purpose of showing the preferred embodiments and are not considered to be a limitation of the present invention. In the drawings:

[0033] Figure 1 is the X - ray diffraction pattern of the MoS 2 , MoS with rich - molybdenum defects 2 , MoS with rich - sulfur defects 2 piezoelectric materials.

[0034] Figure 2 is the atomic force micrograph of the MoS 2 piezoelectric material prepared in Example 1 of the present invention.

[0035] Figure 3 is the atomic force - piezoelectric response diagram of the MoS 2 piezoelectric material prepared in Example 1 of the present invention.

[0036] Figure 4 is the hysteresis loop - piezoelectric butterfly curve diagram of the MoS 2 piezoelectric material prepared in Example 1 of the present invention.

[0037] Figure 5 This is the sulfur-rich defective MoS prepared in Example 2 of the present invention 2 Atomic force micrograph of the piezoelectric material.

[0038] Figure 6 This is the sulfur-rich defective MoS prepared in Example 2 of the present invention 2 Atomic force-piezoelectric response map of the piezoelectric material.

[0039] Figure 7 This is the molybdenum-rich defective MoS prepared in Example 3 of the present invention 2 Atomic force micrograph of the piezoelectric material.

[0040] Figure 8 This is the molybdenum-rich defective MoS prepared in Example 3 of the present invention 2 Atomic force-piezoelectric response map of the piezoelectric material.

[0041] Figure 9 This is the molybdenum-rich defective MoS prepared in Example 3 of the present invention 2 Hysteresis loop-piezoelectric butterfly curve graph of the piezoelectric material. Detailed implementation manners

[0042] The present invention will be further described in detail below in conjunction with the specific implementation manners. The provided embodiments are only for clarifying the present invention, rather than limiting the scope of the present invention. The following provided embodiments can be used as a guide for those of ordinary skill in the art to make further improvements, and do not constitute any limitation to the present invention in any way.

[0043] The methods used in the following embodiments are all conventional methods unless otherwise specified, and are carried out according to the techniques or conditions described in the literature in this field or according to the product specifications. The materials, reagents, etc. used in the following embodiments can be obtained from commercial channels unless otherwise specified.

[0044] The commercial titanium-based ruthenium-iridium electrode in the following embodiments is a handleless ruthenium-iridium titanium mesh produced by Suzhou Shulte Industrial Technology Co., Ltd., and is cut into 50 mm × 50 mm × 1 mm for standby.

[0045] The kitchen waste in the following embodiments comes from the cafeteria kitchen waste.

[0046] Example 1: Preparation of a piezoelectric catalytic electrode material and its application to the deep dehydration of organic solid waste

[0047] I. Preparation of the piezoelectric catalytic electrode material

[0048] Sodium molybdate with a molybdenum to sulfur molar ratio of 0.5:1 and thiourea (1.2 g) were thoroughly mixed with 60 mL of a 10 wt% ethanol aqueous solution. The mixed solution was placed in a reaction kettle with a polytetrafluoroethylene inner lining and reacted at 220 °C for 24 h. After the solid product was dried under vacuum, nano-flower-shaped MoS 2 piezoelectric material (see the XRD pattern in Figure 1 , and the atomic force micrograph in Figure 2 ). Combining the atomic force-piezoelectric response map of the MoS 2 piezoelectric material (attached Figure 3 ), the piezoelectric response is concentrated at the edges of the MoS 2 particles, and the piezoelectric coefficient d 33 is 17.61 pm / V. The complete butterfly ring and hysteresis loop prove the piezoelectric properties of the MoS 2 catalytic material (attached Figure 4 ).

[0049] 0.5 g of the piezoelectric material and a commercial titanium-based ruthenium-iridium electrode (50 × 50 × 0.1 mm 3 ) were placed in 50 mL of deionized aqueous solution. After thorough mixing, they were transferred to a reaction kettle with a polytetrafluoroethylene inner lining and hydrothermally reacted at 180 °C for 12 h. After the reaction, the commercial titanium-based ruthenium-iridium electrode was taken out and dried in an oven at 80 °C for 2 h to obtain the MoS 2 piezoelectric catalytic electrode material for standby.

[0050] II. Deep dehydration of organic solid waste

[0051] The above piezoelectric catalytic electrode material was used as the anode and cathode, the plate spacing was 5 cm, and the electrolyte was organic solid waste (food waste) with a moisture content of 40% - 45%. Under the constant voltage mode of a regulated power supply (DH1766-2), the voltage intensity was 0.50 V, and it was operated for 5 min.

[0052] After the operation, the moisture content of the organic solid waste decreased from 40% - 45% to 30.5% - 35.5%, and the calculated deep dehydration rate of the organic solid waste was 9.5%.

[0053] Example 2. Preparation of a piezoelectric catalytic electrode material and its application in the deep dehydration of organic solid waste

[0054] I. Preparation of a piezoelectric catalytic electrode material

[0055] Sodium molybdate with a molybdenum to sulfur molar ratio of 2:1 and thiourea (1.2 g) were thoroughly mixed with 60 mL of a 10 wt% ethanol aqueous solution. The mixed solution was placed in a reaction kettle with a polytetrafluoroethylene inner lining and reacted at 220 °C for 24 h. After the solid product was dried under vacuum, sulfur-deficient nano-flower-shaped MoS 2Piezoelectric material (XRD pattern shown in Figure 1 , atomic force microscopy image shown in Figure 5 ). Combining the atomic force-piezoelectric response image of sulfur-deficient MoS 2 piezoelectric material (attached Figure 6 ), the piezoelectric response is still concentrated on the edges of MoS 2 particles.

[0056] Mix 0.5 g of the piezoelectric material with a commercial titanium-based ruthenium-iridium electrode (50 × 50 × 0.1 mm 3 ) in 50 mL of deionized aqueous solution. After thorough mixing, transfer it to a reaction kettle with a polytetrafluoroethylene liner. Under the condition of 180 °C, carry out hydrothermal reaction for 12 h. After the reaction, take out the commercial titanium-based ruthenium-iridium electrode and place it in an oven at 80 °C for drying for 2 h to obtain sulfur-deficient MoS 2 piezoelectric catalytic electrode material for standby.

[0057] II. Deep dehydration of organic solid waste

[0058] Use the above piezoelectric catalytic electrode material as the anode and cathode, with the plate spacing of 5 cm and the electrolyte being organic solid waste (food waste) with a water content of 40% - 45%. Under the constant voltage mode of a regulated power supply (DH1766-2), the voltage intensity is 0.50 V, and run for 5 min.

[0059] After the operation, the water content of the organic solid waste decreases from 40% - 45% to 30.4% - 35.4%. The deep dehydration rate of the organic solid waste is calculated to be 9.6%.

[0060] Example 3: Preparation of piezoelectric catalytic electrode material and its application in deep dehydration of organic solid waste

[0061] I. Preparation of piezoelectric catalytic electrode material

[0062] Mix sodium molybdate with a molybdenum to sulfur molar ratio of 0.2:1 and thiourea (1.2 g) with 60 mL of 10 wt% ethanol aqueous solution thoroughly. Place the mixed solution in a reaction kettle with a polytetrafluoroethylene liner and react at 220 °C for 24 h. After the solid product is vacuum dried, obtain molybdenum-deficient nanoflower-like MoS 2 piezoelectric material (XRD pattern shown in Figure 1 , atomic force microscopy image shown in Figure 7 ). Combining the atomic force-piezoelectric response image of molybdenum-deficient MoS 2 piezoelectric material (attached Figure 8 ), the piezoelectric response is concentrated on the surface of MoS 2 particles, and the piezoelectric coefficient d 33 is 51.58 pm / V. The good butterfly ring and hysteresis loop prove that molybdenum-deficient MoS 2Piezoelectric Properties of Catalytic Materials (Appended Figure 9 ).

[0063] Mix 0.5 g of piezoelectric material with a commercial titanium-based ruthenium-iridium electrode (50 × 50 × 0.1 mm 3 ) in 50 mL of deionized aqueous solution. After thorough mixing, transfer it to a reaction kettle with a polytetrafluoroethylene lining. Under the condition of 180 °C, carry out hydrothermal reaction for 12 h. After the reaction, take out the commercial titanium-based ruthenium-iridium electrode and place it in an oven to dry at 80 °C for 2 h to obtain molybdenum-deficient MoS 2 piezoelectric catalytic electrode material for standby use.

[0064] II. Deep Dehydration of Organic Solid Wastes

[0065] Use the above piezoelectric catalytic electrode material as the anode and cathode, with the plate spacing of 5 cm. The electrolyte is organic solid waste (food waste) with a water content of 40% - 45%. Under the constant voltage mode of a regulated power supply (DH1766-2), the voltage intensity is 0.50 V, and run for 5 min.

[0066] After the operation, the water content of the organic solid waste drops from 40% - 45% to 29.8% - 34.8%. Calculate that the deep dehydration rate of the organic solid waste is 10.2%.

[0067] It can be seen from Example 1 - Example 3 that the molar ratio of molybdenum source to sulfur source can be adjusted within the range of (0.2 - 2):1, and the nano-flower-shaped MoS with different defect structures prepared from molybdenum sources and sulfur sources with different molar ratios 2 piezoelectric materials all have good piezoelectric properties. Further, the piezoelectric catalytic electrodes compounded with titanium-based ruthenium-iridium electrodes can all achieve deep dehydration of organic solid wastes. Among them, when the molar ratio of molybdenum to sulfur is 0.2:1, the prepared piezoelectric material is molybdenum-deficient nano-flower-shaped MoS 2 piezoelectric material, which has the best piezoelectric properties and the highest dehydration rate for organic solid wastes.

[0068] Example 4. Preparation of Piezoelectric Catalytic Electrode Material and Its Application in Deep Dehydration of Organic Solid Wastes

[0069] I. Preparation of Piezoelectric Catalytic Electrode Material

[0070] Mix sodium molybdate with a molybdenum-to-sulfur molar ratio of 0.2:1 and thiourea (1.2 g) with 60 mL of 10 wt% ethanol aqueous solution thoroughly. Place the mixed solution in a reaction kettle with a polytetrafluoroethylene lining and react at 220 °C for 22 h. After the solid product is vacuum-dried, obtain molybdenum-deficient nano-flower-shaped MoS 2 piezoelectric material.

[0071] Mix 0.5 g of the piezoelectric material with a commercial titanium-based ruthenium-iridium electrode (50 × 50 × 0.1 mm 3 ), place it in 50 mL of deionized aqueous solution. After thorough mixing, transfer it to a reaction kettle with a polytetrafluoroethylene lining. Under the condition of 180 °C, carry out hydrothermal reaction for 12 h. After the reaction, take out the commercial titanium-based ruthenium-iridium electrode, place it in an oven and dry it at 80 °C for 2 h to obtain a molybdenum-deficient MoS 2 piezoelectrocatalytic electrode material for standby.

[0072] II. Deep dehydration of organic solid waste

[0073] Use the above-mentioned piezoelectrocatalytic electrode material as the anode and cathode, with the plate spacing of 5 cm. The electrolyte is organic solid waste (food waste) with a moisture content of 40% - 45%. Under the constant voltage mode of a regulated power supply (DH1766-2), the voltage intensity is 0.50 V, and operate for 5 min.

[0074] After the operation, the moisture content of the organic solid waste changes from 40% - 45% to 29.9% - 34.9%. Calculate that the deep dehydration rate of the organic solid waste is 10.1%.

[0075] Example 5. Preparation of piezoelectrocatalytic electrode material and its application in deep dehydration of organic solid waste

[0076] I. Preparation of piezoelectrocatalytic electrode material

[0077] Mix sodium molybdate with a molybdenum to sulfur molar ratio of 0.2:1 and thiourea (1.2 g) with 60 mL of 10 wt% ethanol aqueous solution thoroughly. Place the mixed solution in a reaction kettle with a polytetrafluoroethylene lining. React at 220 °C for 20 h. After the solid product is dried in vacuum, obtain a molybdenum-deficient nanoflower-like MoS 2 piezoelectric material.

[0078] Mix 0.5 g of the piezoelectric material with a commercial titanium-based ruthenium-iridium electrode (50 × 50 × 0.1 mm 3 ), place it in 50 mL of deionized aqueous solution. After thorough mixing, transfer it to a reaction kettle with a polytetrafluoroethylene lining. Under the condition of 180 °C, carry out hydrothermal reaction for 12 h. After the reaction, take out the commercial titanium-based ruthenium-iridium electrode, place it in an oven and dry it at 80 °C for 2 h to obtain a molybdenum-deficient MoS 2 piezoelectrocatalytic electrode material for standby.

[0079] II. Deep dehydration of organic solid waste

[0080] The above-mentioned piezoelectric catalytic electrode material was used as the anode and cathode, the plate spacing was 5 cm, the electrolyte was organic solid waste (kitchen waste) with a water content of 40% to 45%, and the voltage intensity was 0.50 V in the constant voltage mode of the voltage-stabilized power supply (DH1766-2) for 5 min.

[0081] At the end of the operation, the moisture content of organic solid waste changed from 40%-45% to 30.1%-35.1%, and the calculated deep dehydration rate of organic solid waste was 9.9%.

[0082] Example 6: Preparation of piezoelectric catalytic electrode material and its application in deep dehydration of organic solid waste

[0083] 1. Preparation of piezoelectric catalytic electrode materials

[0084] Sodium molybdate and thiourea (1.2 g) with a molar ratio of molybdenum to sulfur of 0.2:1 were fully mixed with 60 mL of 10 wt% ethanol aqueous solution. The mixed solution was placed in a polytetrafluoroethylene-lined reactor and reacted at 220 °C for 18 h. The solid product was vacuum dried to obtain molybdenum-defective nanoflower-like MoS 2 Piezoelectric materials.

[0085] 0.5 g of piezoelectric material was placed on a commercial titanium-based ruthenium-iridium electrode (50 × 50 × 0.1 mm 3 ) was added to 50 mL of deionized water solution, mixed thoroughly, and then transferred to a reactor lined with polytetrafluoroethylene. The reaction was carried out at 180 °C for 12 h. After the reaction, the commercial titanium-based ruthenium-iridium electrode was taken out and dried in an oven at 80 °C for 2 h to obtain the molybdenum-deficient MoS 2 Piezoelectric catalytic electrode material, ready for use.

[0086] 2. Deep dehydration of organic solid waste

[0087] The above-mentioned piezoelectric catalytic electrode material was used as the anode and cathode, the plate spacing was 5 cm, the electrolyte was organic solid waste (kitchen waste) with a water content of 40% to 45%, and the voltage intensity was 0.50 V in the constant voltage mode of the voltage-stabilized power supply (DH1766-2) for 5 min.

[0088] At the end of the operation, the moisture content of organic solid waste changed from 40%~45%b to 30.2%~35.2%, and the calculated deep dehydration rate of organic solid waste was 9.8%.

[0089] It can be seen from Examples 3 to 6 that the solvothermal reaction time can be adjusted within 18 to 24 hours. 2 The piezoelectric catalytic electrode obtained by combining the catalytic material with the titanium-based ruthenium-iridium electrode can achieve deep dehydration of organic solid waste.

[0090] Example 7: Preparation of piezoelectric catalytic electrode material and its application in deep dehydration of organic solid waste

[0091] 1. Preparation of piezoelectric catalytic electrode materials

[0092] Sodium molybdate and thiourea (1.2 g) with a molar ratio of molybdenum to sulfur of 0.2:1 were fully mixed with 60 mL of 10 wt% ethanol aqueous solution. The mixed solution was placed in a polytetrafluoroethylene-lined reactor and reacted at 220 °C for 22 h. The solid product was vacuum dried to obtain molybdenum-defective nanoflower-like MoS 2 Piezoelectric materials.

[0093] 1.5 g of piezoelectric material was placed on a commercial titanium-based ruthenium-iridium electrode (50 × 50 × 0.1 mm 3 ) was added to 50 mL of deionized water solution, mixed thoroughly, and then transferred to a reactor lined with polytetrafluoroethylene. The reaction was carried out at 180 °C for 12 h. After the reaction, the commercial titanium-based ruthenium-iridium electrode was taken out and dried in an oven at 80 °C for 2 h to obtain the molybdenum-deficient MoS 2 Piezoelectric catalytic electrode material, ready for use.

[0094] 2. Deep dehydration of organic solid waste

[0095] The above-mentioned piezoelectric catalytic electrode material was used as the anode and cathode, the plate spacing was 5 cm, the electrolyte was organic solid waste (kitchen waste) with a water content of 40% to 45%, and the voltage intensity was 0.50 V in the constant voltage mode of the voltage-stabilized power supply (DH1766-2) for 5 min.

[0096] At the end of the operation, the moisture content of organic solid waste changed from 40% to 45% to 28.7% to 33.7%, and the calculated deep dehydration rate of organic solid waste was 11.3%.

[0097] Example 8: Preparation of piezoelectric catalytic electrode material and its application in deep dehydration of organic solid waste

[0098] 1. Preparation of piezoelectric catalytic electrode materials

[0099] Sodium molybdate and thiourea (1.2 g) with a molar ratio of molybdenum to sulfur of 0.2:1 were fully mixed with 60 mL of 10 wt% ethanol aqueous solution. The mixed solution was placed in a polytetrafluoroethylene-lined reactor and reacted at 220 °C for 22 h. The solid product was vacuum dried to obtain molybdenum-defective nanoflower-like MoS 2 Piezoelectric materials.

[0100] 2.5 g of piezoelectric material was placed on a commercial titanium-based ruthenium-iridium electrode (50 × 50 × 0.1 mm 3)Into 50 mL of deionized aqueous solution, after thorough mixing, it was transferred to a reaction kettle with a polytetrafluoroethylene lining. Under the condition of 180 °C, a hydrothermal reaction was carried out for 12 h. After the reaction, the commercial titanium-based ruthenium-iridium electrode was taken out and placed in an oven to be dried at 80 °C for 2 h, obtaining molybdenum-deficient MoS 2 Piezoelectrocatalytic electrode material, reserved for use.

[0101] II. Deep dehydration of organic solid waste

[0102] Using the above piezoelectrocatalytic electrode material as the anode and cathode, with the plate spacing of 5 cm and the electrolyte being organic solid waste (food waste) with a moisture content of 40% - 45%, under the constant voltage mode of a regulated power supply (DH1766 - 2), the voltage intensity was 0.50 V, and it was operated for 5 min.

[0103] After the operation ended, the moisture content of the organic solid waste changed from 40% - 45% to 28.1% - 33.1%. The calculated deep dehydration rate of the organic solid waste was 11.9%.

[0104] It can be seen from Example 3, Example 7 and Example 8 that for the titanium-based ruthenium-iridium electrode (50 × 50 × 0.1 mm 3 ), the dosage of the piezoelectric material can be adjusted within the range of 0.5 - 2.5 g. The piezoelectrocatalytic electrode materials obtained by compounding piezoelectric materials with different dosages with the titanium-based ruthenium-iridium electrode can all achieve the deep dehydration of organic solid waste.

[0105] Example 9. Preparation of piezoelectrocatalytic electrode material and its application in the deep dehydration of organic solid waste

[0106] I. Preparation of piezoelectrocatalytic electrode material

[0107] Sodium molybdate with a molybdenum-to-sulfur molar ratio of 0.2:1 and thiourea (1.2 g) were thoroughly mixed with 60 mL of 10 wt% ethanol aqueous solution. The mixed solution was placed in a reaction kettle with a polytetrafluoroethylene lining and reacted at 220 °C for 22 h. After the solid product was vacuum dried, molybdenum-deficient nanoflower-like MoS 2 Piezoelectric material was obtained.

[0108] 2.5 g of the piezoelectric material and a commercial titanium-based ruthenium-iridium electrode (50 × 50 × 0.1 mm 3 )were put into 50 mL of deionized aqueous solution. After thorough mixing, it was transferred to a reaction kettle with a polytetrafluoroethylene lining. Under the condition of 180 °C, a hydrothermal reaction was carried out for 12 h. After the reaction, the commercial titanium-based ruthenium-iridium electrode was taken out and placed in an oven to be dried at 80 °C for 2 h, obtaining molybdenum-deficient MoS 2 Piezoelectrocatalytic electrode material, reserved for use.

[0109] II. Deep dehydration of organic solid waste

[0110] The above piezoelectric catalytic electrode material is used as the anode and cathode, the plate spacing is 5 cm, the electrolyte is organic solid waste (food waste) with a moisture content of 45% - 50%, and under the constant voltage mode of a regulated power supply (DH1766-2), the voltage intensity is 0.50 V, and it operates for 5 min.

[0111] After the operation, the moisture content of the organic solid waste changes from 45% - 50% to 32.7% - 37.7%, and the calculated deep dehydration rate of the organic solid waste is 12.3%.

[0112] Example 10: Preparation of a piezoelectric catalytic electrode material and its use in the deep dehydration of organic solid waste

[0113] I. Preparation of the piezoelectric catalytic electrode material

[0114] Sodium molybdate with a molybdenum to sulfur molar ratio of 0.2:1 and thiourea (1.2 g) are fully mixed with 60 mL of a 10 wt% ethanol aqueous solution. The mixed solution is placed in a reaction kettle with a polytetrafluoroethylene lining and reacted at 220 °C for 22 h. After the solid product is vacuum dried, molybdenum-deficient nanoflower-shaped MoS 2 piezoelectric material is obtained.

[0115] 2.5 g of the piezoelectric material and a commercial titanium-based ruthenium-iridium electrode (50 × 50 × 0.1 mm 3 ) are placed in 50 mL of deionized aqueous solution. After full mixing, it is transferred to a reaction kettle with a polytetrafluoroethylene lining and hydrothermally reacted at 180 °C for 12 h. After the reaction, the commercial titanium-based ruthenium-iridium electrode is taken out and dried in an oven at 80 °C for 2 h to obtain the molybdenum-deficient MoS 2 piezoelectric catalytic electrode material for standby.

[0116] II. Deep dehydration of organic solid waste

[0117] The above piezoelectric catalytic electrode material is used as the anode and cathode, the plate spacing is 5 cm, the electrolyte is organic solid waste (food waste) with a moisture content of 50% - 55%, and under the constant voltage mode of a regulated power supply (DH1766-2), the voltage intensity is 0.50 V, and it operates for 5 min.

[0118] After the operation, the moisture content of the organic solid waste changes from 50% - 55% to 37.5% - 42.5%, and the calculated deep dehydration rate of the organic solid waste is 12.5%.

[0119] Example 11: Preparation of a piezoelectric catalytic electrode material and its use in the deep dehydration of organic solid waste

[0120] I. Preparation of the piezoelectric catalytic electrode material

[0121] Sodium molybdate with a molybdenum to sulfur molar ratio of 0.2:1 and thiourea (1.2 g) were thoroughly mixed with 60 mL of a 10 wt% ethanol aqueous solution. The mixed solution was placed in a reaction kettle with a polytetrafluoroethylene liner and reacted at 220 °C for 22 h. After the solid product was dried under vacuum, molybdenum-deficient nanoflower-like MoS 2 piezoelectric material.

[0122] 2.5 g of the piezoelectric material and a commercial titanium-based ruthenium-iridium electrode (50 × 50 × 0.1 mm 3 ) were placed in 50 mL of deionized aqueous solution. After thorough mixing, it was transferred to a reaction kettle with a polytetrafluoroethylene liner and hydrothermally reacted at 180 °C for 12 h. After the reaction, the commercial titanium-based ruthenium-iridium electrode was taken out and dried in an oven at 80 °C for 2 h to obtain molybdenum-deficient MoS 2 piezoelectric catalytic electrode material for standby.

[0123] II. Deep dehydration of organic solid waste

[0124] The above piezoelectric catalytic electrode material was used as the anode and cathode, the plate spacing was 5 cm, and the electrolyte was organic solid waste (food waste) with a moisture content of 55% - 60%. Under the constant voltage mode of a regulated power supply (DH1766-2), the voltage intensity was 0.50 V and it ran for 5 min.

[0125] After the operation ended, the moisture content of the organic solid waste changed from 55% - 60% to 42.1% - 47.1%, and the calculated deep dehydration rate of the organic solid waste was 12.9%.

[0126] It can be seen from Examples 8 - 11 that the moisture content of the organic solid waste (food waste) can be adjusted within the range of 40% - 60%, and the method of the present invention can achieve deep dehydration of the organic solid waste within this moisture content range.

[0127] Example 12. Preparation of a piezoelectric catalytic electrode material and its application to the deep dehydration of organic solid waste

[0128] I. Preparation of a piezoelectric catalytic electrode material

[0129] Sodium molybdate with a molybdenum to sulfur molar ratio of 0.2:1 and thiourea (1.2 g) were thoroughly mixed with 60 mL of a 10 wt% ethanol aqueous solution. The mixed solution was placed in a reaction kettle with a polytetrafluoroethylene liner and reacted at 220 °C for 22 h. After the solid product was dried under vacuum, molybdenum-deficient nanoflower-like MoS 2 piezoelectric material.

[0130] 2.5 g of the piezoelectric material and a commercial titanium-based ruthenium-iridium electrode (50 × 50 × 0.1 mm 3)Into 50 mL of deionized aqueous solution, after thorough mixing, it was transferred to a reaction kettle with a polytetrafluoroethylene lining, and under the condition of 180 °C, hydrothermal reaction was carried out for 12 h. After the reaction, the commercial titanium-based ruthenium-iridium electrode was taken out, placed in an oven and dried at 80 °C for 2 h, and then molybdenum-deficient MoS 2 piezoelectrocatalytic electrode material was obtained and reserved for use.

[0131] II. Deep dehydration of organic solid waste

[0132] Using the above piezoelectrocatalytic electrode material as the anode and cathode, the plate spacing was 3 cm, and the electrolyte was organic solid waste (food waste) with a moisture content of 55% - 60%. Under the constant voltage mode of a regulated power supply (DH1766 - 2), the voltage intensity was 0.50 V, and the operation was carried out for 5 min.

[0133] After the operation ended, the moisture content of the organic solid waste changed from 55% - 60% to 41.8% - 46.8%, and the calculated deep dehydration rate of the organic solid waste was 13.2%.

[0134] Example 13: Preparation of piezoelectrocatalytic electrode material and its application in deep dehydration of organic solid waste

[0135] I. Preparation of piezoelectrocatalytic electrode material

[0136] Sodium molybdate with a molybdenum-to-sulfur molar ratio of 0.2:1 and thiourea (1.2 g) were thoroughly mixed with 60 mL of 10 wt% ethanol aqueous solution. The mixed solution was placed in a reaction kettle with a polytetrafluoroethylene lining, and reacted at 220 °C for 22 h. After the solid product was vacuum dried, molybdenum-deficient nanoflower-like MoS 2 piezoelectric material was obtained.

[0137] 2.5 g of the piezoelectric material and a commercial titanium-based ruthenium-iridium electrode (50 × 50 × 0.1 mm 3 )Into 50 mL of deionized aqueous solution, after thorough mixing, it was transferred to a reaction kettle with a polytetrafluoroethylene lining, and under the condition of 180 °C, hydrothermal reaction was carried out for 12 h. After the reaction, the commercial titanium-based ruthenium-iridium electrode was taken out, placed in an oven and dried at 80 °C for 2 h, and then molybdenum-deficient MoS 2 piezoelectrocatalytic electrode material was obtained and reserved for use.

[0138] II. Deep dehydration of organic solid waste

[0139] Using the above piezoelectrocatalytic electrode material as the anode and cathode, the plate spacing was 1 cm, and the electrolyte was organic solid waste (food waste) with a moisture content of 55% - 60%. Under the constant voltage mode of a regulated power supply (DH1766 - 2), the voltage intensity was 0.50 V, and the operation was carried out for 5 min.

[0140] At the end of the operation, the moisture content of organic solid waste changed from 55%-60% to 41.6%-46.6%, and the calculated deep dehydration rate of organic solid waste was 13.4%.

[0141] It can be seen from Examples 1-13 that the plate spacing in the present invention can be adjusted within the range of 1 to 5 cm, and the method of the present invention can achieve deep dehydration of organic solid waste within this substrate spacing.

[0142] Example 14: Preparation of piezoelectric catalytic electrode material and its application in deep dehydration of organic solid waste

[0143] 1. Preparation of piezoelectric catalytic electrode materials

[0144] Sodium molybdate and thiourea (1.2 g) with a molar ratio of molybdenum to sulfur of 0.2:1 were fully mixed with 60 mL of 10 wt% ethanol aqueous solution. The mixed solution was placed in a polytetrafluoroethylene-lined reactor and reacted at 220 °C for 22 h. The solid product was vacuum dried to obtain molybdenum-defective nanoflower-like MoS 2 Piezoelectric materials.

[0145] 2.5 g of piezoelectric material was placed on a commercial titanium-based ruthenium-iridium electrode (50 × 50 × 0.1 mm 3 ) was added to 50 mL of deionized water solution, mixed thoroughly, and then transferred to a reactor lined with polytetrafluoroethylene. The reaction was carried out at 180 °C for 12 h. After the reaction, the commercial titanium-based ruthenium-iridium electrode was taken out and dried in an oven at 80 °C for 2 h to obtain the molybdenum-deficient MoS 2 Piezoelectric catalytic electrode material, ready for use.

[0146] 2. Deep dehydration of organic solid waste

[0147] The above-mentioned piezoelectric catalytic electrode material was used as the anode and cathode, the distance between the plates was 1 cm, the electrolyte was organic solid waste (kitchen waste) with a water content of 55% to 60%, and the voltage intensity was 0.75 V under the constant voltage mode of the voltage-stabilized power supply (DH1766-2) for 5 min.

[0148] At the end of the operation, the moisture content of organic solid waste changed from 55%-60% to 41.5%-46.5%, and the calculated deep dehydration rate of organic solid waste was 13.5%.

[0149] Example 15: Preparation of piezoelectric catalytic electrode material and its application in deep dehydration of organic solid waste

[0150] 1. Preparation of piezoelectric catalytic electrode materials

[0151] Sodium molybdate with a molybdenum to sulfur molar ratio of 0.2:1 and thiourea (1.2 g) were thoroughly mixed with 60 mL of a 10 wt% ethanol aqueous solution. The mixed solution was placed in a reaction kettle with a PTFE liner and reacted at 220 °C for 22 h. After the solid product was dried under vacuum, molybdenum-deficient nanoflower-shaped MoS 2 piezoelectric material was obtained.

[0152] 2.5 g of the piezoelectric material and a commercial titanium-based ruthenium-iridium electrode (50 × 50 × 0.1 mm 3 ) were placed in 50 mL of deionized aqueous solution. After thorough mixing, it was transferred to a reaction kettle with a PTFE liner and hydrothermally reacted at 180 °C for 12 h. After the reaction, the commercial titanium-based ruthenium-iridium electrode was taken out and dried in an oven at 80 °C for 2 h to obtain molybdenum-deficient MoS 2 piezoelectrocatalytic electrode material for standby.

[0153] II. Deep dehydration of organic solid waste

[0154] Using the above piezoelectrocatalytic electrode material as the anode and cathode, with a plate spacing of 1 cm and an electrolyte of organic solid waste (food waste) with a moisture content of 55% - 60%, under the constant voltage mode of a regulated power supply (DH1766-2), the voltage intensity was 1 V and it was operated for 5 min.

[0155] After the operation ended, the moisture content of the organic solid waste changed from 55% - 60% to 41.5 - 46.5%. The deep dehydration rate of the organic solid waste was calculated to be 13.5%.

[0156] Example 16: Preparation of a piezoelectrocatalytic electrode material and its application in the deep dehydration of organic solid waste

[0157] I. Preparation of the piezoelectrocatalytic electrode material

[0158] Sodium molybdate with a molybdenum to sulfur molar ratio of 0.2:1 and thiourea (1.2 g) were thoroughly mixed with 60 mL of a 10 wt% ethanol aqueous solution. The mixed solution was placed in a reaction kettle with a PTFE liner and reacted at 220 °C for 22 h. After the solid product was dried under vacuum, molybdenum-deficient nanoflower-shaped MoS 2 piezoelectric material was obtained.

[0159] 2.5 g of the piezoelectric material and a commercial titanium-based ruthenium-iridium electrode (50 × 50 × 0.1 mm 3 ) were placed in 50 mL of deionized aqueous solution. After thorough mixing, it was transferred to a reaction kettle with a PTFE liner and hydrothermally reacted at 180 °C for 12 h. After the reaction, the commercial titanium-based ruthenium-iridium electrode was taken out and dried in an oven at 80 °C for 2 h to obtain molybdenum-deficient MoS 2Piezoelectric catalytic electrode material, ready for use.

[0160] 2. Deep dehydration of organic solid waste

[0161] The above-mentioned piezoelectric catalytic electrode material was used as the anode and cathode, the distance between the plates was 1 cm, the electrolyte was organic solid waste (kitchen waste) with a water content of 55% to 60%, and the voltage intensity was 1.25 V in the constant voltage mode of the voltage-stabilized power supply (DH1766-2) for 5 min.

[0162] At the end of the operation, the moisture content of organic solid waste changed from 55% to 60% to 41.7% to 46.7%, and the calculated deep dehydration rate of organic solid waste was 13.3%.

[0163] It can be seen from Examples 13-16 that, under the constant voltage mode, the voltage intensity can be adjusted within the range of 0.50 to 1.25 V, and the method of the present invention can achieve deep dehydration of organic solid waste under this voltage intensity.

[0164] Example 17: Preparation of piezoelectric catalytic electrode material and its application in deep dehydration of organic solid waste

[0165] 1. Preparation of piezoelectric catalytic electrode materials

[0166] Sodium molybdate and thiourea (1.2 g) with a molar ratio of molybdenum to sulfur of 0.2:1 were fully mixed with 60 mL of 10 wt% ethanol aqueous solution. The mixed solution was placed in a polytetrafluoroethylene-lined reactor and reacted at 220 °C for 22 h. The solid product was vacuum dried to obtain molybdenum-defective nanoflower-like MoS 2 Piezoelectric materials.

[0167] 2.5 g of piezoelectric material was placed on a commercial titanium-based ruthenium-iridium electrode (50 × 50 × 0.1 mm 3 ) was added to 50 mL of deionized water solution, mixed thoroughly, and then transferred to a reactor lined with polytetrafluoroethylene. The reaction was carried out at 180 °C for 12 h. After the reaction, the commercial titanium-based ruthenium-iridium electrode was taken out and dried in an oven at 80 °C for 2 h to obtain the molybdenum-deficient MoS 2 Piezoelectric catalytic electrode material, ready for use.

[0168] 2. Deep dehydration of organic solid waste

[0169] The above-mentioned piezoelectric catalytic electrode material was used as the anode and cathode, the distance between the plates was 1 cm, the electrolyte was organic solid waste (kitchen waste) with a water content of 55% to 60%, and the voltage intensity was 0.75 V in the constant voltage mode of the voltage-stabilized power supply (DH1766-2) for 8 min.

[0170] The operation is completed. The moisture content of the organic solid waste changes from 55% - 60% to 41.7% - 46.7%. The calculated deep dehydration rate of the organic solid waste is 13.3%.

[0171] Example 18: Preparation of a piezoelectric catalytic electrode material and its application in the deep dehydration of organic solid waste

[0172] I. Preparation of the piezoelectric catalytic electrode material

[0173] Sodium molybdate with a molybdenum to sulfur molar ratio of 0.2:1 and thiourea (1.2 g) were fully mixed with 60 mL of a 10 wt% ethanol aqueous solution. The mixed solution was placed in a reaction kettle with a polytetrafluoroethylene liner and reacted at 220 °C for 22 h. After the solid product was dried under vacuum, molybdenum-deficient nanoflower-like MoS 2 piezoelectric material was obtained.

[0174] 2.5 g of the piezoelectric material and a commercial titanium-based ruthenium-iridium electrode (50 × 50 × 0.1 mm 3 ) were placed in 50 mL of deionized aqueous solution. After full mixing, it was transferred to a reaction kettle with a polytetrafluoroethylene liner and hydrothermally reacted at 180 °C for 12 h. After the reaction, the commercial titanium-based ruthenium-iridium electrode was taken out and dried in an oven at 80 °C for 2 h to obtain the molybdenum-deficient MoS 2 piezoelectric catalytic electrode material for standby.

[0175] II. Deep dehydration of organic solid waste

[0176] The above piezoelectric catalytic electrode material was used as the anode and cathode, the plate spacing was 1 cm, and the electrolyte was organic solid waste (food waste) with a moisture content of 55% - 60%. Under the constant voltage mode of a regulated power supply (DH1766-2), the voltage intensity was 0.75 V, and it was operated for 10 min.

[0177] The operation is completed. The moisture content of the organic solid waste changes from 55% - 60% to 41.6% - 46.6%. The calculated deep dehydration rate of the organic solid waste is 13.4%.

[0178] It can be seen from Examples 14, 17, and 18 that under the constant voltage mode, the operation time can be adjusted within the range of 5 - 10 min, and deep dehydration of the organic solid waste can be achieved within this operation time.

[0179] Example 19: Preparation of a piezoelectric catalytic electrode material and its application in the deep dehydration of organic solid waste

[0180] I. Preparation of the piezoelectric catalytic electrode material

[0181] Sodium molybdate with a molybdenum to sulfur molar ratio of 0.2:1 and thiourea (1.2 g) were thoroughly mixed with 60 mL of a 10 wt% ethanol aqueous solution. The mixed solution was placed in a reaction kettle with a polytetrafluoroethylene liner and reacted at 220 °C for 22 h. After the solid product was dried under vacuum, molybdenum-deficient nanoflower-like MoS was obtained. 2 Piezoelectric material.

[0182] 2.5 g of the piezoelectric material and a commercial titanium-based ruthenium-iridium electrode (50 × 50 × 0.1 mm 3 ) were placed in 50 mL of deionized aqueous solution. After thorough mixing, they were transferred to a reaction kettle with a polytetrafluoroethylene liner and hydrothermally reacted at 180 °C for 12 h. After the reaction, the commercial titanium-based ruthenium-iridium electrode was taken out and dried in an oven at 80 °C for 2 h to obtain a molybdenum-deficient MoS 2 Piezoelectric catalytic electrode material for standby.

[0183] II. Deep dehydration of organic solid waste

[0184] The above piezoelectric catalytic electrode material was used as the anode and cathode, the plate spacing was 1 cm, and the electrolyte was organic solid waste (food waste) with a moisture content of 55% - 60%. Under the pulsed voltage mode of a regulated power supply (DH1766-2), the voltage intensity was ±1 V, with a pulse period of 10 s and an operating time within 5 min.

[0185] After the operation ended, the moisture content of the organic solid waste changed from 55% - 60% to 41.5% - 46.5%, and the calculated deep dehydration rate of the organic solid waste was 13.5%.

[0186] Example 20: Preparation of a piezoelectric catalytic electrode material and its application in the deep dehydration of organic solid waste

[0187] I. Preparation of a piezoelectric catalytic electrode material

[0188] Sodium molybdate with a molybdenum to sulfur molar ratio of 0.2:1 and thiourea (1.2 g) were thoroughly mixed with 60 mL of a 10 wt% ethanol aqueous solution. The mixed solution was placed in a reaction kettle with a polytetrafluoroethylene liner and reacted at 220 °C for 22 h. After the solid product was dried under vacuum, molybdenum-deficient nanoflower-like MoS was obtained. 2 Piezoelectric material.

[0189] 2.5 g of the piezoelectric material and a commercial titanium-based ruthenium-iridium electrode (50 × 50 × 0.1 mm 3)Into 50 mL of deionized aqueous solution, after thorough mixing, it was transferred to a reaction kettle with a polytetrafluoroethylene lining, and hydrothermal reaction was carried out at 180 °C for 12 h. After the reaction, the commercial titanium-based ruthenium-iridium electrode was taken out and dried in an oven at 80 °C for 2 h to obtain molybdenum-deficient MoS 2 Piezoelectric catalytic electrode material for standby.

[0190] II. Deep dehydration of organic solid waste

[0191] Using the above piezoelectric catalytic electrode material as the anode and cathode, the plate spacing was 1 cm, and the electrolyte was organic solid waste (food waste) with a moisture content of 55% - 60%. Under the pulsed voltage mode of a regulated power supply (DH1766-2), the voltage intensity was ±1V, with a pulse period of 10 s, and the running time was within 8 min.

[0192] After the operation ended, the moisture content of the organic solid waste changed from 55% - 60% to 41.3% - 46.3%, and the deep dehydration rate of the organic solid waste was calculated to be 13.7%.

[0193] Example 21: Preparation of piezoelectric catalytic electrode material and its application in deep dehydration of organic solid waste

[0194] I. Preparation of piezoelectric catalytic electrode material

[0195] Sodium molybdate and thiourea (1.2 g) with a molybdenum-to-sulfur molar ratio of 0.2:1 were thoroughly mixed with 60 mL of 10 wt% ethanol aqueous solution. The mixed solution was placed in a reaction kettle with a polytetrafluoroethylene lining and reacted at 220 °C for 22 h. After the solid product was vacuum dried, molybdenum-deficient nanoflower-like MoS 2 Piezoelectric material was obtained.

[0196] 2.5 g of the piezoelectric material and a commercial titanium-based ruthenium-iridium electrode (50 × 50 × 0.1 mm 3 )Into 50 mL of deionized aqueous solution, after thorough mixing, it was transferred to a reaction kettle with a polytetrafluoroethylene lining, and hydrothermal reaction was carried out at 180 °C for 12 h. After the reaction, the commercial titanium-based ruthenium-iridium electrode was taken out and dried in an oven at 80 °C for 2 h to obtain molybdenum-deficient MoS 2 Piezoelectric catalytic electrode material for standby.

[0197] II. Deep dehydration of organic solid waste

[0198] Use the above piezoelectric catalytic electrode material as the anode and cathode, with the plate spacing of 1 cm. The electrolyte is organic solid waste (food waste) with a water content of 55% - 60%. Under the pulsed voltage mode of a regulated power supply (DH1766 - 2), the voltage intensity is ±1 V, with a pulse period of 10 s, and the running time is within 10 min.

[0199] After the operation, the water content of the organic solid waste changes from 55% - 60% to 41.3% - 46.3%, and the calculated deep dehydration rate of the organic solid waste is 13.7%.

[0200] It can be seen from Examples 19 - 21 that under the pulsed voltage mode, the running time can be adjusted within the range of 5 - 10 min, and deep dehydration of the organic solid waste can be achieved within this running time.

[0201] Example 22: Prepare a piezoelectric catalytic electrode material and use it for deep dehydration of organic solid waste

[0202] I. Preparation of piezoelectric catalytic electrode material

[0203] Fully mix sodium molybdate with a molybdenum to sulfur molar ratio of 0.2:1 and thiourea (1.2 g) with 60 mL of water. Place the mixed solution in a reaction kettle with a polytetrafluoroethylene inner lining and react at 220 °C for 22 h. After the solid product is vacuum dried, molybdenum - defect nanosheet - like MoS 2 piezoelectric material is obtained.

[0204] Put 2.5 g of the piezoelectric material and a commercial titanium - based ruthenium - iridium electrode (50 × 50 × 0.1 mm 3 ) into 50 mL of deionized aqueous solution. After full mixing, transfer it to a reaction kettle with a polytetrafluoroethylene inner lining and carry out a hydrothermal reaction at 180 °C for 12 h. After the reaction, take out the commercial titanium - based ruthenium - iridium electrode and dry it in an oven at 80 °C for 2 h to obtain molybdenum - defect MoS 2 piezoelectric catalytic electrode material for standby.

[0205] II. Deep dehydration of organic solid waste

[0206] Use the above piezoelectric catalytic electrode material as the anode and cathode, with the plate spacing of 1 cm. The electrolyte is organic solid waste (food waste) with a water content of 55% - 60%. Under the constant voltage mode of a regulated power supply (DH1766 - 2), the voltage intensity is 0.75 V, and run for 5 min.

[0207] After the operation, the water content of the organic solid waste changes from 55% - 60% to 41.5% - 46.5%, and the calculated deep dehydration rate of the organic solid waste is 13.5%.

[0208] Example 23: Preparation of a Piezoelectrocatalytic Electrode Material and Its Application in Deep Dehydration of Organic Solid Wastes

[0209] I. Preparation of the Piezoelectrocatalytic Electrode Material

[0210] Sodium molybdate with a molybdenum to sulfur molar ratio of 0.2:1 and thiourea (1.2 g) were thoroughly mixed with 60 mL of water. The mixed solution was placed in a reaction kettle with a polytetrafluoroethylene inner lining and reacted at 220 °C for 22 h. After the solid product was dried under vacuum, molybdenum-deficient nanoflower-shaped MoS 2 piezoelectric material was obtained.

[0211] 2.5 g of the piezoelectric material and a commercial titanium-based ruthenium-iridium electrode (50 × 50 × 0.1 mm 3 ) were placed in 50 mL of deionized aqueous solution. After thorough mixing, it was transferred to a reaction kettle with a polytetrafluoroethylene inner lining and hydrothermally reacted at 180 °C for 12 h. After the reaction, the commercial titanium-based ruthenium-iridium electrode was taken out and dried in an oven at 80 °C for 2 h to obtain the molybdenum-deficient MoS 2 piezoelectrocatalytic electrode material for standby.

[0212] II. Deep Dehydration of Organic Solid Wastes

[0213] The above-mentioned piezoelectrocatalytic electrode material was used as the anode and cathode, the plate spacing was 1 cm, and the electrolyte was organic solid waste (food waste) with a moisture content of 55% - 60%. Under the pulsed voltage mode of a regulated power supply (DH1766-2), the voltage intensity was ±1 V, with a pulse period of 10 s and an operating time within the range of 8 min.

[0214] After the operation ended, the moisture content of the organic solid waste changed from 55% - 60% to 41.3% - 46.3%, and the calculated deep dehydration rate of the organic solid waste was 13.7%.

[0215] It can be seen from Examples 14, 20, 22, and 23 that the catalytic electrode materials prepared from different precursors can achieve deep dehydration of organic solid wastes under different voltage modes.

[0216] The above has detailed the present invention. For those skilled in the art, within the scope not departing from the purpose and spirit of the present invention, the present invention can be implemented within a relatively wide range under equivalent parameters, concentrations, and conditions. Although specific examples of the present invention are given, it should be understood that the present invention can be further improved. In short, according to the principle of the present invention, this application intends to include any changes, uses, or improvements to the present invention, including changes made using conventional techniques known in the art that are outside the scope disclosed in this application.

Claims

1. A method for deep dehydration of organic solid waste, characterized in that: The steps include: The electrically driven piezoelectric catalytic electrode for deep dehydration of organic solid waste is used as the anode plate and the cathode plate respectively, and the organic solid waste to be treated is used as the electrolyte, and voltage is applied to achieve deep dehydration of the organic solid waste; The method for preparing the electrically driven piezoelectric catalytic electrode for deep dehydration of organic solid waste comprises the following steps: S1, mixing a molybdenum source, a sulfur source and a solvent for a solvothermal reaction to obtain a nanoflower-shaped MoS2-based piezoelectric material; The MoS2-based piezoelectric material includes any one of a MoS2 piezoelectric material, a sulfur-defective MoS2 piezoelectric material, and a molybdenum-defective MoS2 piezoelectric material, wherein the molybdenum-sulfur molar ratio is regulated to construct a MoS2 piezoelectric material with molybdenum defects and sulfur-rich defects; S2. Mix the MoS2-based piezoelectric material, titanium-based ruthenium-iridium electrode and water to carry out a hydrothermal reaction to obtain the electrically driven piezoelectric catalytic electrode for deep dehydration of organic solid waste.

2. The method for deep dehydration of organic solid waste according to claim 1, characterized in that: The addition amounts of the molybdenum source and the sulfur source are controlled so that the molar ratio of molybdenum to sulfur is (0.2-2.0):1; The molybdenum source is one of sodium molybdate and ammonium molybdate; The sulfur source is one of sulfur powder, thiourea, thioacetamide, mercaptan, L-cysteine, and sodium sulfate; The solvent is water or an aqueous solution of ethanol.

3. The method for deep dehydration of organic solid waste according to claim 2, characterized in that: The added amounts of the molybdenum source and the sulfur source are controlled so that the molar ratio of molybdenum to sulfur is 0.2:

1.

4. The method for deep dehydration of organic solid waste according to any one of claims 1-2, characterized in that: The solvent thermal reaction is carried out in a reaction vessel at a reaction temperature of 180°C to 220°C and a reaction time of 18 to 24 hours; The method further comprises the step of vacuum drying the product after the solvothermal reaction.

5. The method for deep dehydration of organic solid waste according to claim 4, characterized in that: The solvent thermal reaction is carried out at 220° C. for 22 to 24 hours.

6. The method for deep dehydration of organic solid waste according to any one of claims 1-2, characterized in that: Each 50 × 50 × 0.1 mm 3 The titanium-based ruthenium-iridium electrode is mixed with 0.5 to 2.5 g of the MoS2-based piezoelectric material.

7. The method for deep dehydration of organic solid waste according to claim 6, characterized in that: Each 50 × 50 × 0.1 mm 3 The titanium-based ruthenium-iridium electrode is mixed with 2.5 g of the MoS2-based piezoelectric material.

8. The method for deep dehydration of organic solid waste according to any one of claims 1-2, characterized in that: The hydrothermal reaction is carried out in a reactor at a temperature of 180°C to 220°C and a reaction time of 12 to 16 hours; The method further comprises a step of drying the product after the hydrothermal reaction.

9. The method for deep dehydration of organic solid waste according to claim 1, characterized in that: The organic solid waste is one or more of kitchen waste, river and lake sediment, and engineering mud; The moisture content of the organic solid waste is 40% to 60%.

10. The method for deep dehydration of organic solid waste according to claim 1 or 9, characterized in that: The distance between the anode plate and the cathode plate is 1 to 5 cm.

11. The method for deep dehydration of organic solid waste according to claim 10, characterized in that: The distance between the anode plate and the cathode plate is 1 cm.

12. The method for deep dehydration of organic solid waste according to claim 1 or 9, characterized in that: The electrolytic treatment adopts the following mode 1) or mode 2): 1) Constant voltage mode, voltage intensity is 0.50~1.25 V, running time is 5~10 min; 2) Pulse voltage mode: the voltage intensity is ±1 V, the pulse cycle is 10 s, and the operating time is 5 to 10 min.

13. The method for deep dehydration of organic solid waste according to claim 12, characterized in that: In the constant voltage mode, the voltage intensity is 0.75-1 V and the operation time is 5 min.

14. The method for deep dehydration of organic solid waste according to claim 12, characterized in that: In the pulse voltage mode, the operating time is 8 minutes.

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