Sponge photo-thermal interface evaporation device with antibacterial effect as well as preparation method and application of sponge photo-thermal interface evaporation device

Abstract

The invention discloses a sponge photo-thermal interface evaporation device with an antibacterial effect and a preparation method and application of the sponge photo-thermal interface evaporation device. The sponge photo-thermal interface evaporation device comprises a photo-thermal layer and a water supply layer which are arranged up and down, and the photo-thermal layer is laid on the water supply layer; the photo-thermal layer is printing paper modified by a CPTS solution, and the CPTS solution is prepared from the following components in parts by weight: 0.03 to 0.07 part of nano titanium dioxide particles, 0.15 to 0.35 part of carbon nanotubes, 0.08 to 0.18 part of polyvinyl alcohol, 0.04 to 0.10 part of lauryl sodium sulfate and 20 to 30 parts of deionized water; and the water supply layer is obtained by soaking sponge in a 10-25g / L tea polyphenol aqueous solution for modification. The tea polyphenol is creatively applied to sponge modification to prepare the interface evaporation material, on one hand, the tea polyphenol plays a role in bacteriostasis, and on the other hand, the tea polyphenol serves as a hydrophilic modifier to enhance the hydrophilicity of the sponge material, and the interface evaporation efficiency is improved.

Description

Technical Field

[0001] The invention relates to the technical field of photothermal interface evaporation material preparation, and in particular to a sponge photothermal interface evaporation device with antibacterial effect, and a preparation method and application thereof. Background Art

[0002] People from all walks of life are actively researching and trying to develop a variety of effective freshwater generation methods. Among these well-developed technologies, solar-driven seawater desalination technology has attracted the attention of many scholars due to its relatively simple structure and low cost. In a typical solar-driven seawater desalination process, water is injected into the solar evaporator with the help of the capillary action of the evaporator holes. However, there are actually a large number of various bacteria and organic matter distributed in the water. Their presence will not only affect the water evaporation rate of the solar interface evaporation material, but also some of the pathogenic bacteria and organic matter may enter the evaporated fresh water during the water evaporation process, which seriously affects the safety of people drinking fresh water.

[0003] At present, some people have made some solar interfacial evaporation materials with antibacterial properties, but most of their methods use expensive silver ions to make antibacterial materials, which is not very helpful for the research that needs to develop materials that can be mass-produced and have higher antibacterial properties. Therefore, in view of the shortcomings of the existing technology, it is necessary to develop a cheap interfacial evaporation material with antibacterial function, which is of great significance for the subsequent research on antibacterial materials and drinking water treatment. Summary of the invention

[0004] The purpose of the present invention is to provide a sponge photothermal interface evaporation device with antibacterial effect and its preparation method and application in view of the above problems.

[0005] In order to achieve its purpose, the present invention adopts the following technical solution:

[0006] The first aspect of the present invention provides a sponge photothermal interface evaporation device with antibacterial effect, comprising a photothermal layer and a water supply layer arranged up and down, wherein the photothermal layer is laid on the water supply layer;

[0007] The photothermal layer is a printing paper modified by a CPTS solution, which is obtained by soaking the printing paper in a CPTS solution and drying it, wherein the CPTS solution comprises the following components by weight: 0.03-0.07 parts of nano titanium dioxide particles, 0.15-0.35 parts of carbon nanotubes, 0.08-0.18 parts of polyvinyl alcohol, 0.04-0.10 parts of sodium dodecyl sulfate, and 20-30 parts of deionized water;

[0008] The water supply layer is modified by soaking the sponge in a 10-25g / L tea polyphenol aqueous solution.

[0009] Preferably, the sponge is a polyurethane sponge or a polyvinyl alcohol sponge.

[0010] Preferably, the thickness of the sponge is 0.5 to 5 cm, preferably 0.5 to 2 cm or 1.0 to 1.5 cm; the area of ​​the photothermal layer is greater than or equal to the area of ​​the sponge, covering the upper surface of the sponge.

[0011] Preferably, the CPTS solution comprises the following components by weight: 0.04-0.06 parts of nano titanium dioxide particles, 0.20-0.30 parts of carbon nanotubes, 0.10-0.15 parts of polyvinyl alcohol, 0.06-0.08 parts of sodium lauryl sulfate, and 23-27 parts of deionized water;

[0012] The concentration of the tea polyphenols aqueous solution is 15-22 g / L.

[0013] The second aspect of the present invention provides a method for preparing the sponge photothermal interface evaporation device described in any one of the above items, comprising the following steps:

[0014] (1) Preparation of tea polyphenol modified sponge water supply layer: soaking the sponge in tea polyphenol aqueous solution to allow the sponge to fully absorb the solution, and after the sponge is fully absorbed by the solution, taking it out and drying it to obtain a tea polyphenol modified sponge:

[0015] (2) Preparing a photothermal layer of printing paper modified with a CPTS solution: soaking the printing paper in a CPTS solution until the paper fully absorbs the solution and then drying it to obtain a printing paper modified with a CPTS solution;

[0016] (3) Preparation of modified interface evaporation device: The printing paper modified with CPTS solution is spread on the surface of the sponge modified with tea polyphenols to obtain a photothermal interface evaporation device.

[0017] Preferably, in step (1), the sponge is immersed in the tea polyphenol aqueous solution for 1 to 10 hours each time, and after immersion, the sponge is taken out and dried in an oven at 50 to 70° C. for 2 to 4 hours until it is dry;

[0018] Step (1) is repeated 1 to 5 times.

[0019] Preferably, in step (2), the printing paper is immersed in the CPTS solution for 1 to 10 hours;

[0020] Step (2) is repeated 1 to 5 times.

[0021] Preferably, steps (1) and (2) are repeated 2 to 4 times.

[0022] The third aspect of the present invention provides the application of the sponge photothermal interface evaporation device described in any of the above items in solar-driven interface evaporation, photothermal seawater desalination, and sewage treatment.

[0023] The application is to allow the water supply layer of the sponge photothermal interface evaporation device to contact the water to be treated, and the water supply layer sponge transfers the water upward to the photothermal layer.

[0024] The beneficial effects of the present invention are:

[0025] 1. The present invention innovatively applies tea polyphenols to the sponge modification to prepare the interface evaporation material. By immersing the sponge in the tea polyphenol solution, the tea polyphenols can play an antibacterial function on the one hand, which greatly reduces the cost compared with the interface evaporation material in the prior art that uses expensive silver ions to achieve the antibacterial function; on the other hand, it acts as a hydrophilic modifier to enhance the hydrophilicity of the sponge material itself, greatly enhancing the water transmission capacity of the sponge material, so that the water in contact with the lower part of the sponge material is continuously transmitted to the photothermal layer, thereby improving the efficiency of interface evaporation.

[0026] 2. At present, the production process of most carbon-based biomass interface evaporation materials such as carbonized wax gourd, carbonized eggplant, carbon-based aerogel, etc. is relatively complicated, and the production process requires the use of expensive and energy-consuming equipment such as muffle furnaces and freeze dryers, which is costly; while the interface evaporation device of the present invention is to lay a layer of printing paper with photocatalytic effect on the surface of the modified sponge. The sponge is easy to obtain and has a wide source. The photothermal layer can be made of waste paper, which can recycle waste on the one hand and reduce environmental pollution on the other hand; the preparation method is simple, does not require cumbersome and energy-consuming processes such as high-temperature carbonization and freeze drying, is low-cost, can be mass-produced, has high interface evaporation efficiency, can be applied to seawater desalination, degradation of organic wastewater and other fields, and has a wide range of applications.

[0027] 3. The interfacial evaporation device of the present invention achieves a better balance between water supply and heat transfer through the layered structure design of super hydrophilic layer-hydrophobic photothermal layer, so that more heat is concentrated on the surface of the material to achieve an excellent interfacial evaporation rate. BRIEF DESCRIPTION OF THE DRAWINGS

[0028] Figure 1 This is a picture of the product prepared in Example 1 after being cultured on a potato culture medium covered with bacteria for 72 hours ( Figure 1 Right) and the actual picture of the potato culture medium filled with bacteria without any product after one week of culture ( Figure 1 Left).

[0029] Figure 2 The degradation rate of CPTS@paper-tea polyphenols@polyurethane sponge in different concentrations of methyl orange solution under one sun and the removal rate of 7 mg / L methyl orange in 5 consecutive hours.

[0030] Figure 3 The products obtained in Examples 1-5 and Comparative Examples 1-2 were exposed to one sunlight (1000W / m 2) is the water evaporation rate under irradiation.

[0031] Figure 4 The photothermal layer of the product obtained in Example 1 ( Figure 4 Left) and water supply layer ( Figure 4 Contact angle test picture (right)

[0032] Figure 5 This is a scanning electron microscope image of polyurethane sponge before tea polyphenol modification.

[0033] Figure 6 This is a scanning electron microscope image of the polyurethane sponge after modification with tea polyphenols. DETAILED DESCRIPTION

[0034] The present invention will be further described below in conjunction with embodiments, but the present invention is not limited thereto.

[0035] The experimental methods in the following examples are conventional methods unless otherwise specified.

[0036] Example 1 :

[0037] The modified interfacial evaporation device CPTS@paper-tea polyphenols@polyurethane sponge was prepared by following the steps below:

[0038] (1) Preparation of tea polyphenol modified polyurethane sponge: Cut the polyurethane sponge into circular slices with a thickness of 1 cm and a diameter of 5 cm. Immerse the polyurethane sponge slice in a tea polyphenol (CAS No.: 84650-60-2) aqueous solution for 8 h, the concentration of the tea polyphenol aqueous solution is 20 g / L, and then take it out and put it in a 60°C oven for 3 h. After drying, immerse it in the tea polyphenol solution again, repeat the tea polyphenol immersion-oven drying operation, and repeat it 3 times in total, so that the tea polyphenol is fully covered on the surface of the polyurethane sponge, and obtain a tea polyphenol modified polyurethane sponge: tea polyphenol @ polyurethane sponge.

[0039] (2) Preparation of printing paper modified with CPTS solution: Cut the waste A4 printing paper into discs with a diameter of 5 cm (can be larger, as long as it can cover the sponge), soak them in the CPTS solution for 8 hours, then take them out and dry them naturally at room temperature. Repeat the CPTS solution soaking-drying operation for a total of three times to allow the CPTS solution to fully coat the surface of the waste A4 paper. The formula of the CPTS solution is: 0.05g nano-titanium dioxide particles, 0.25g carbon nanotubes, 0.13g polyvinyl alcohol, 0.07g sodium dodecyl sulfate, and 25ml deionized water, mix well.

[0040] (3) Preparation of modified interface evaporation device: Spread the waste printing paper modified by CPTS solution on the surface of tea polyphenols@polyurethane sponge to obtain the modified interface evaporation device: CPTS@paper-tea polyphenols@polyurethane sponge.

[0041] Embodiment 2: Preparation of modified interfacial evaporation device CPTS@paper-tea polyphenols@polyvinyl alcohol sponge: except that the polyurethane sponge in Example 1 is replaced by polyvinyl alcohol sponge, the other operating steps are exactly the same.

[0042] Embodiment 3: Preparation of modified interfacial evaporation device CPTS@paper-tea polyphenols@waste mop sponge: except that the polyurethane sponge in Example 1 is replaced by the waste mop sponge, the other operating steps are exactly the same.

[0043] Embodiment 4: Preparation of modified interfacial evaporation device CPTS@paper-tea polyphenols@polyurethane sponge: Except for the size of the polyurethane sponge being different from that in Example 1, the remaining operation steps are exactly the same. The polyurethane sponge used in Example 4 is a circular sheet with a thickness of 0.5 cm and a diameter of 5 cm.

[0044] Embodiment 5: Preparation of modified interfacial evaporation device CPTS@paper-tea polyphenols@polyurethane sponge: Except that the size of the polyurethane sponge is different from that in Example 1, the remaining operation steps are exactly the same. The polyurethane sponge used in Example 5 is a circular sheet with a thickness of 1.5 cm and a diameter of 5 cm.

[0045] Comparative Example 1:

[0046] Prepare the interfacial evaporation apparatus and follow the steps below:

[0047] (1) Cut the polyurethane sponge into circular sheets with a thickness of 1 cm and a diameter of 5 cm.

[0048] (2) Soak the waste A4 printing paper in the CPTS solution for 8 hours, then take it out and dry it naturally at room temperature. Repeat the CPTS solution soaking-drying operation for a total of three times to allow the CPTS solution to be fully coated on the surface of the waste A4 paper. The formula of the CPTS solution is: 0.05g nano-titanium dioxide particles, 0.25g carbon nanotubes, 0.13g polyvinyl alcohol, 0.07g sodium dodecyl sulfate, and 25ml deionized water, mix well.

[0049] (3) The waste A4 paper modified with CPTS solution is spread on the surface of the polyurethane sponge and used as a photothermal layer.

[0050] The difference between Comparative Example 1 and Example 1 is that the polyurethane sponge is not coated with tea polyphenols. The results show that its hydrophilicity and antibacterial properties are far inferior to those of tea polyphenols@polyurethane sponge, and its water evaporation rate in pure water is only 0.92 kg / m 2 / h.

[0051] Comparative Example 2:

[0052] Prepare the interfacial evaporation apparatus and follow the steps below:

[0053] (1) Preparation of tea polyphenols @ polyurethane sponge: Cut the polyurethane sponge into circular slices with a thickness of 1 cm and a diameter of 5 cm. Immerse the polyurethane sponge slice in a tea polyphenol (CAS No.: 84650-60-2) solution for 8 h, the concentration of the tea polyphenol solution is 20 g / L, and then take it out and put it in a 60°C oven for 3 h. After drying, immerse it in the tea polyphenol solution again, repeat the tea polyphenol immersion-oven drying operation, and repeat it 3 times in total, so that the tea polyphenol is fully covered on the surface of the polyurethane sponge, and obtain tea polyphenols @ polyurethane sponge.

[0054] (2) The CPTS solution in Example 1 was prepared, and the tea polyphenols@polyurethane sponge was directly immersed in the CPTS solution. The results showed that the structure of the tea polyphenols@polyurethane sponge was deformed after being immersed in the CPTS solution. The CPTS solution would destroy the structure of the sponge, and its water evaporation rate in pure water was only 1.81 kg / m 2 / h.

[0055] Performance Testing

[0056] 1. Antibacterial experimental analysis

[0057] The CPTS@paper-tea polyphenols@polyurethane sponge of Example 1 was placed in a potato culture medium containing bacteria for 72 hours, and a control group was also prepared. The results showed that almost no bacteria were observed in the potato culture medium containing CPTS@A4 paper-tea polyphenols@polyurethane sponge after 72 hours, while the control group was evenly distributed with well-growing bacteria, which indicates that the product of the present invention has good antibacterial properties.

[0058] 2. Photocatalytic experimental analysis

[0059] First, prepare 10 mg / L, 7 mg / L, 5 mg / L, 3 mg / L, and 1 mg / L methyl orange solutions, then use a UV spectrophotometer to measure the absorbance at a wavelength of 464 nm, record the data, and then make a fitting curve. The graph shows that the solution prepared this time has a good standard curve.

[0060] Take a 100 ml beaker, add an appropriate amount of 10 mg / L methyl orange solution into it, and then put the modified interface evaporation device prepared in Example 1 into the beaker. Irradiate under the condition of 1 sun for 1 hour, collect the evaporated water with a condensation device, collect samples at 10 minutes, 20 minutes, 30 minutes, 40 minutes, 50 minutes, and 60 minutes, and then put them into a UV spectrophotometer to measure the absorbance change.

[0061] When testing the photocatalytic effect, evaporated water samples were taken at different time periods to test the concentration of organic pollutant methyl orange. Photocatalytic experiments were conducted on water bodies with different pollutant concentrations of 1mg / L, 3mg / L, 5mg / L, 7mg / L, and 10mg / L, and the concentration of water pollutants within 1 hour was recorded. Figure 2 As shown. At a concentration of 1 mg / L, the pollutant reduction effect over time is not obvious, and the photocatalytic removal rate after 1 hour is about 5%. As the concentration of pollutants in the evaporated water increases, the removal rate within one hour increases from 5% at 1 mg / L to 12% at 7 mg / L, but when it rises to 10 mg / L, the catalytic effect decreases. This is attributed to the excessive concentration of organic pollutants, which hinders the photocatalytic group from receiving light and the attachment and degradation of methylene blue. The concentration with the best removal effect was further selected for a continuous 5-hour photocatalytic experiment, and evaporated water samples were extracted in different time periods to detect the concentration of methyl orange. It can be observed that the photocatalytic effect was obvious in the first 4 hours, and the hourly removal rate was about 17%. By the fifth hour, the removal rate reached 84%. It can be seen that the material has obvious effects in the field of photocatalytic degradation and excellent durability.

[0062] 3. Comparison of water evaporation experiments

[0063] The prepared modified interfacial evaporation device was placed in a beaker containing 100 ml of water and irradiated with simulated sunlight using a xenon lamp (Cel-S500) equipped with an AM 1.5 filter. At the same time, a solar meter (SM206-Solar) was used to calibrate the sunlight intensity to maintain it at one sun (1000 W / m 2 ), an electronic balance (AX224ZH / E) records the mass loss of water in the beaker to measure the interfacial evaporation capacity of the sample. Another beaker is filled with 100 ml of water and placed on the balance. The natural evaporation of the system after 1 hour is recorded in a dark field environment as a control group to calculate its actual evaporation efficiency.

[0064] The products obtained in Example 1, Example 2, Example 3, Example 4, Example 5, Comparative Example 1 and Comparative Example 2 were subjected to water evaporation tests. The evaporation rates of the different samples after continuous evaporation for one hour under the irradiation of one sun were as follows: Figure 3As shown in the figure, under the condition of sunlight irradiation, the water mass in the beaker of pure water and different samples changes with the increase of irradiation time. Among them, the water evaporation rate and efficiency of each product are as follows:

[0065] The water evaporation rate and efficiency of the product obtained in Example 1 can reach 2.52 kg / m 2 / h and 93.82%;

[0066] The water evaporation rate and efficiency of the product obtained in Example 2 are 2.09 kg / m 2 / h and 90.24%;

[0067] The water evaporation rate and efficiency of the product obtained in Example 3 are 2.29 kg / m 2 / h and 88.67%;

[0068] The water evaporation rate and efficiency of the product obtained in Example 4 are 2.03 kg / m 2 / h and 89.93%;

[0069] The water evaporation rate and efficiency of the product obtained in Example 5 are 2.46 kg / m 2 / h and 85.46%;

[0070] The water evaporation rate and efficiency of the product obtained in Comparative Example 1 are 0.92 kg / m 2 / h and 84.62%;

[0071] The water evaporation rate and efficiency of the product obtained in Comparative Example 2 are 1.81 kg / m 2 / h and 83.54%.

[0072] The above results show that the CPTS@paper-tea polyphenols@sponge interface evaporation device of the present invention has excellent water evaporation effect.

[0073] 4. Contact angle test comparison

[0074] The contact angle test was carried out on each part of the product obtained in Example 1, and the results were as follows: Figure 4 As shown, Figure 4 The left picture shows the contact angle test of the printing paper modified with CPTS solution (CPTS@paper, used as the photothermal layer). Figure 4 (Right) is a picture of the contact angle test of the polyurethane sponge (as the water supply layer) modified with tea polyphenols.

[0075] from Figure 4(Left) The contact angle image shows that the hydrophilicity of CPTS@paper is not good, with a contact angle of 103.657°. The photothermal layer is more hydrophobic, which can slow down the water transmission of the photothermal layer, thereby preventing the water in the water supply layer from rushing into the surface of the photothermal layer too quickly, causing heat loss. Figure 4 (Right) It can be seen that the hydrophilicity of the polyurethane sponge is significantly enhanced after modification with tea polyphenols, which greatly enhances the water transmission capacity of the material, so that the water at the bottom of the material is continuously transmitted to the photothermal interface, providing a water source guarantee for the efficient interface evaporation of the material.

[0076] 5. Comparison of the structure of polyurethane sponge before and after modification

[0077] from Figure 5-6 It can be seen that the polyurethane sponge has a uniformly distributed pore structure before modification, and the tea polyphenol immersion treatment makes the sponge's meridian structure more wrinkled. Therefore, the sponge not only has a large number of criss-crossing irregular pore structures, but also has a larger specific surface area, and a large number of tea polyphenol molecules are attached to the surface, making it more hydrophilic, thereby enhancing the evaporation efficiency of the material.

Claims

1. A sponge photothermal interface evaporation device with antibacterial effect, characterized in that: It comprises a photothermal layer and a water supply layer arranged up and down, wherein the photothermal layer is laid on the water supply layer; The photothermal layer is a printing paper modified by a CPTS solution, which is obtained by soaking the printing paper in a CPTS solution and drying it, wherein the CPTS solution comprises the following components by weight: 0.03-0.07 parts of nano titanium dioxide particles, 0.15-0.35 parts of carbon nanotubes, 0.08-0.18 parts of polyvinyl alcohol, 0.04-0.10 parts of sodium dodecyl sulfate, and 20-30 parts of deionized water; The water supply layer is modified by soaking the sponge in a 10-25g / L tea polyphenol aqueous solution.

2. The sponge photothermal interface evaporation device according to claim 1, characterized in that: The sponge is a polyurethane sponge or a polyvinyl alcohol sponge.

3. The sponge photothermal interface evaporation device according to claim 1, characterized in that: The thickness of the sponge is 0.5 to 5 cm, preferably 0.5 to 2 cm or 1.0 to 1.5 cm; the area of ​​the photothermal layer is greater than or equal to the area of ​​the sponge, covering the upper surface of the sponge.

4. The sponge photothermal interface evaporation device according to claim 1, characterized in that: The CPTS solution comprises the following components by weight: 0.04-0.06 parts of nano titanium dioxide particles, 0.20-0.30 parts of carbon nanotubes, 0.10-0.15 parts of polyvinyl alcohol, 0.06-0.08 parts of sodium lauryl sulfate, and 23-27 parts of deionized water; The concentration of the tea polyphenols aqueous solution is 15-22 g / L.

5. The method for preparing the sponge photothermal interface evaporation device according to any one of claims 1 to 4, characterized in that: The steps include: (1) Preparation of tea polyphenol modified sponge water supply layer: soaking the sponge in tea polyphenol aqueous solution to allow the sponge to fully absorb the solution, and after the sponge is fully absorbed by the solution, taking it out and drying it to obtain a tea polyphenol modified sponge: (2) Preparing a photothermal layer of printing paper modified with a CPTS solution: soaking the printing paper in a CPTS solution until the paper fully absorbs the solution and then drying it to obtain a printing paper modified with a CPTS solution; (3) Preparation of modified interface evaporation device: The printing paper modified with CPTS solution is spread on the surface of the sponge modified with tea polyphenols to obtain a photothermal interface evaporation device.

6. The preparation method according to claim 5, characterized in that: In step (1), the sponge is immersed in the tea polyphenol aqueous solution for 1 to 10 hours each time, and after immersion, the sponge is taken out and dried in an oven at 50 to 70° C. for 2 to 4 hours until it is dry; Step (1) is repeated 1 to 5 times.

7. The preparation method according to claim 5, characterized in that: In step (2), the printing paper is immersed in the CPTS solution for 1 to 10 hours; Step (2) is repeated 1 to 5 times.

8. The preparation method according to claim 5, characterized in that: Steps (1) and (2) are repeated 2 to 4 times.

9. Application of the sponge photothermal interface evaporation device according to any one of claims 1 to 4 in solar-driven interface evaporation, photothermal seawater desalination, and sewage treatment.

10. The use according to claim 9, characterized in that: The water supply layer of the sponge photothermal interface evaporation device is brought into contact with the water to be treated, and the water supply layer sponge transfers the water upward to the photothermal layer.

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