Gravity driven self-powered wastewater purification method

Abstract

The present application relates to the technical field of water pollution control and environmental purification, and discloses a gravity-driven self-powered sewage purification method.The method comprises: dispersing sewage containing organic pollutants to form continuous droplets with a single droplet volume of 20-100 muL, and making the continuous droplets drop on a multiphase interface reaction substrate under the action of their own gravity, wherein the drop height of the continuous droplets is > 30 cm, and the multiphase interface reaction substrate comprises a substrate and an electronegative dielectric material coated on the surface of the substrate.The method utilizes the synergistic effect of liquid-gas pre-charging during droplet falling and charge compression of three-phase contact line at the moment of impact to realize efficient in-situ generation of active oxygen free radicals without external power supply and chemical catalysts, and then complete the in-situ mineralization of organic pollutants in sewage.

Description

Technical Field

[0001] This invention relates to the field of water pollution control and environmental purification technology, specifically to a gravity-driven self-powered wastewater purification method. Background Technology

[0002] In the field of water pollution control and environmental purification, traditional advanced oxidation processes (such as photocatalytic oxidation, ozone oxidation, and Fenton oxidation) can effectively degrade recalcitrant pollutants in water, but their practical engineering applications have always faced two major bottlenecks: First, their high dependence on external energy. These processes often require a large amount of electrical energy, light energy, or chemical reagents to activate the oxidation reaction, which not only increases the operating cost of the equipment but also limits their application in scenarios lacking a stable energy supply. Second, the problem of recovering powdered catalysts. Powdered catalysts, which are widely used in traditional processes, have high catalytic activity, but are difficult to completely separate and recover from the water after the reaction. This not only wastes the catalyst but may also introduce secondary pollution due to residual catalysts, further increasing the complexity of the treatment process and the cost of operation and maintenance.

[0003] As a novel green catalytic technology, contact electrocatalysis (CEC) offers a new approach to addressing the aforementioned pain points thanks to its unique energy harvesting mechanism. This technology generates a contact potential difference through physical interactions such as contact friction and collision between materials, thereby achieving the efficient capture and conversion of dispersed kinetic energy in the environment (such as water flow impact, wind power, and mechanical vibration). It eliminates the need for additional external energy input, fundamentally reducing the energy consumption requirements of the process and aligning with the green and low-carbon industrial development trend. However, current research on contact electrocatalysis technology is still in the laboratory exploration stage, and its large-scale application still faces key technical bottlenecks. The most critical gap lies in how to achieve high efficiency and continuity of energy conversion in the contact electrocatalysis process through simple and low-cost physical structure design, breaking the limitations of "intermittent reaction" in laboratory pilot tests. More importantly, how to effectively adapt this technology to existing large-scale industrial scenarios (especially various water conservancy facilities, such as sewage treatment plants, reservoirs, water diversion canals, industrial circulating water systems, etc.) to solve the problem of transferring the technology from the laboratory to engineering applications and achieve large-scale and continuous purification of pollutants. This problem remains a key technical gap that has not yet been overcome in this field, and it also restricts the industrialization process of contact electrocatalysis technology. Summary of the Invention

[0004] The purpose of this invention is to overcome the problems of high energy consumption, reliance on auxiliary reagents, and complex treatment processes in existing wastewater treatment technologies containing organic pollutants, and to provide a gravity-driven, self-powered wastewater purification method. This method utilizes the synergistic effect of liquid-gas pre-charging during droplet descent and charge compression of the three-phase contact line at the moment of impact to achieve efficient in-situ generation of reactive oxygen free radicals without the need for external power sources or chemical catalysts, thereby completing the in-situ mineralization of organic pollutants in wastewater.

[0005] To achieve the above objectives, the present invention provides a gravity-driven self-powered wastewater purification method, the method comprising: dispersing wastewater containing organic pollutants to form continuous droplets with individual droplet volumes of 20-100 μL, and allowing the continuous droplets to fall onto a multiphase interface reaction substrate under their own gravity, wherein the droplet height is >30 cm, and the multiphase interface reaction substrate comprises a substrate and an electronegative dielectric material covering the surface of the substrate.

[0006] Preferably, the volume of a single droplet in the continuous droplet is 30-50 μL.

[0007] Preferably, the process of dispersing wastewater containing organic pollutants is carried out in a fluid distributor, which includes a discrete droplet generator with a porous array structure, wherein the inner diameter of a single outlet hole of the fluid distributor is 0.5-5 mm.

[0008] Preferably, the droplet height of the continuous droplets is 40-120 cm, and more preferably 80-110 cm.

[0009] Preferably, in the multiphase interface reaction substrate, the thickness of the electronegative dielectric material is 20-100 μm.

[0010] Preferably, in the multiphase interface reaction substrate, the electronegative dielectric material is selected from at least one of fluorinated ethylene propylene copolymer, polyvinyl chloride, polytetrafluoroethylene, polydimethylsiloxane, polyimide, and polypropylene.

[0011] Preferably, in the wastewater containing organic pollutants, the concentration of the organic pollutants is 1-100 mg / L, more preferably 1.5-50 mg / L.

[0012] Preferably, the organic pollutant is selected from at least one of gentian violet, rhodamine B, methyl red, malachite green and acid yellow G.

[0013] Preferably, when the organic pollutant is Rhodamine B, the electronegative dielectric material is a fluorinated ethylene propylene copolymer.

[0014] Preferably, when the organic pollutant is gentian violet, the electronegative dielectric material is polyvinyl chloride.

[0015] The method described in this invention first disperses anhydrous materials containing organic pollutants to form liquid droplets with a volume of 20-100 μL. Then, the droplets undergo a pre-charging stage at the liquid-gas interface during their free fall under their own gravity, allowing the droplet surface to initially accumulate charge. When the pre-charged droplets collide at high speed with the multiphase interface reaction substrate, the three-phase contact line formed by the droplets, substrate, and air experiences an instantaneous charge compression effect. This synergistic effect of pre-charging and charge compression enables the efficient in-situ generation of reactive oxygen species (ROS) without any external power supply or chemical catalysts. The generated ROS are highly active and stable, and can rapidly react with various organic pollutants in wastewater to undergo oxidative degradation reactions, ultimately achieving complete in-situ mineralization of organic pollutants. Attached Figure Description

[0016] Figure 1 This is a schematic diagram of an apparatus for implementing the method described in this invention; Figure 2 This is a microscopic evolution diagram of the pre-charging process of droplet falling and the charge compression process of impacting the TPCL; Figure 3 This is a comparison chart of the degradation rates of organic pollutants under conditions of no pre-charge (blank group) and pre-charged additional charge. Figure 4 This is a schematic diagram of the structure of the fluid distributor described in this invention; Figure 5 The curves showing the current change when droplets of different volumes rub against FEP material (a) and the voltage change when droplets of different volumes rub against FEP film (b) are shown.

[0017] Explanation of reference numerals in the attached figures 1. Fluid guiding unit; 101. Continuous fluid inlet; 102. Water distribution main pipe; 103. Flexible hose; 2. Multiphase interface reaction substrate; 3. Water collection unit. Detailed Implementation

[0018] The following provides a detailed description of specific embodiments of the present invention. It should be understood that the specific embodiments described herein are for illustrative and explanatory purposes only and are not intended to limit the scope of the invention.

[0019] The endpoints and any values ​​of the ranges disclosed herein are not limited to the precise ranges or values, and these ranges or values ​​should be understood to include values ​​close to these ranges or values. For numerical ranges, the endpoint values ​​of the various ranges, the endpoint values ​​of the various ranges and individual point values, and individual point values ​​can be combined with each other to obtain one or more new numerical ranges, which should be considered as specifically disclosed herein.

[0020] The gravity-driven self-powered wastewater purification method of the present invention includes: dispersing wastewater containing organic pollutants to form continuous droplets with a single droplet volume of 20-100 μL, and allowing the continuous droplets to fall onto a multiphase interface reaction substrate under their own gravity, wherein the droplet height of the continuous droplets is >30 cm, and the multiphase interface reaction substrate includes a substrate and an electronegative dielectric material covering the surface of the substrate.

[0021] In some embodiments, the process of dispersing wastewater containing organic pollutants is carried out in a fluid distributor, which is a discrete droplet generator with a porous array structure, wherein the inner diameter of a single outlet hole of the fluid distributor is 0.5-5 mm. The fluid distributor includes a continuous fluid inlet, a distribution main pipe, and a flexible hose; a structural schematic diagram is shown below. Figure 4 As shown. The inner diameter of a single outlet of the hose is between 0.5 and 5 mm.

[0022] In the method described in this invention, the fluid distributor is not a simple water storage container, but a droplet shaper that divides and restricts the fluid through tiny orifices. Compared to natural water flow, this structure, by reducing the outlet radius, forcibly alters the force balance during droplet detachment, resulting in droplets with smaller volumes and higher specific surface areas. This limitation of structural parameters aims to maximize the surface charge accumulation efficiency of the droplets during liquid-gas electrostatics and provide more extreme physical conditions for TPCL charge compression. In this invention, the material is preferably a corrosion-resistant polymer; specifically, the water distribution main and the flexible hose are PVC pipes.

[0023] In some preferred embodiments, the volume of a single droplet of the continuous droplet is 30-95 μL, preferably 40-90 μL. As a specific example, the volume of a single droplet of the continuous droplet can be 40 μL, 50 μL, 60 μL, 70 μL, 80 μL, or 90 μL.

[0024] In the method described in this invention, the continuous droplets can generate initial charge accumulation through friction with the air during the dripping process under their own gravity, so that the surface of the droplets initially accumulates charge, resulting in charged droplets.

[0025] In some preferred embodiments, the droplet height of the continuous liquid droplets is 40-120 cm, preferably 80-110 cm. As a specific example, the droplet height of the continuous liquid droplets can be 80 cm, 85 cm, 90 cm, 95 cm, 100 cm, 105 cm, or 110 cm.

[0026] In this invention, the substrate material constituting the multiphase interface reaction substrate can be selected from a variety of solid substrates with suitable interface properties, including but not limited to mica (MICA), single crystal silicon wafers (Si), ITO conductive glass, stainless steel sheets, polyvinyl chloride (PVC) sheets, and various industrial filler supports.

[0027] In this invention, the electronegative dielectric material coated on the substrate surface has excellent charge locking and binding capabilities, and does not generate or excite electrons during operation; the negative charge enriched on the material surface mainly comes from free charges in the environmental system, electrostatic accumulation charges in the air, and local electrons captured by defect sites and trap states on the material surface and can be stably bound for a long time.

[0028] In a preferred embodiment, the electronegative dielectric material in the multiphase interfacial reactive substrate is selected from at least one of fluorinated ethylene propylene copolymer, polyvinyl chloride, polytetrafluoroethylene, polydimethylsiloxane, polyimide, and polypropylene. In a further preferred embodiment, the electronegative dielectric material is fluorinated ethylene propylene copolymer and / or polyvinyl chloride.

[0029] In some embodiments, the thickness of the electronegative dielectric material in the multiphase interface reaction substrate is 20-100 μm, preferably 22-80 μm, and more preferably 25-60 μm. As a specific example, the thickness of the electronegative dielectric material in the multiphase interface reaction substrate can be 25 μm, 30 μm, 35 μm, 40 μm, 45 μm, 50 μm, 55 μm, or 60 μm.

[0030] In the method described in this invention, when a charged droplet impacts a multiphase interface reaction substrate, the droplet spreads and deforms within a very short time, evolving synchronously with the overall fluid motion. During this dynamic process, the charge carried on the surface of the charged droplet significantly enriches and highly accumulates in the liquid-gas-solid three-phase contact line (TPCL) region, thereby forming a localized high-intensity instantaneous electric field at the three-phase interface. This electric field strength is sufficient to break the chemical bond energy of water molecules, providing the necessary electron source for subsequent redox reactions. Simultaneously, at the instant of impact, the enormous impact pressure shortens the interatomic distance at the liquid-solid interface to the order of atomic radius. At this point, the originally independent atomic potential wells overlap, resulting in a significant reduction in the interfacial potential barrier, allowing electrons to overcome the work function constraint and be released from the electronegative material surface and transferred to the liquid phase interface. The microscopic evolution diagram of the droplet's pre-charging during fall and the charge compression process during impact with the TPCL is shown below. Figure 2 As shown.

[0031] In the method described in this invention, electrons (e) transferred from the electronegative material to the interface - Holes (or electron-losing sites) directly participate in multiphase reactions in water, and the specific chemical pathways are as follows: ① Superoxide radicals (·O 2- The generation of ) Oxygen molecules dissolved in the droplet act as electron acceptors, capturing electrons transferred from the electronegative material and undergoing a reduction reaction: O2+e - → O 2 ; ② Generation of hydroxyl radicals (·OH): Due to the instantaneous high potential formed after electron transfer occurs on the surface of the electronegative material (or through the hole path of water molecules), water molecules or hydroxide ions at the interface lose electrons and are oxidized: H2O-e - → OH+H + ; Alternatively, the generated superoxide radicals may be transformed through further disproportionation reactions. O2 - +2H + +e - →H2O2→2 OH.

[0032] In the method described in this invention, the reactive oxygen species generated in the above process, especially hydroxyl radicals, can efficiently carry out in-situ mineralization and degradation of organic pollutants in the system, gradually decomposing them into inorganic small molecule products such as carbon dioxide and water, thereby achieving deep removal and harmless transformation of organic pollutants.

[0033] In the method described in this invention, the source of the wastewater containing organic pollutants is not specifically limited, and its application scenarios are wide-ranging, including but not limited to industrial cooling tower packing circulation systems, building drainage pipe networks, urban rainwater collection and utilization systems, and various water environments such as artificial landscape waterfalls.

[0034] In the method described in this invention, the type of organic pollutant is not particularly limited. Common organic compounds that can be oxidized and decomposed by reactive oxygen species all fall within the scope of protection of this invention. Preferably, the organic pollutant is selected from at least one of gentian violet, rhodamine B, methyl red, malachite green, and acid yellow G. More preferably, the organic pollutant is gentian violet and / or rhodamine B.

[0035] In some embodiments, the concentration of the organic pollutants in the wastewater containing organic pollutants is 1-100 mg / L, preferably 1.5-50 mg / L, and more preferably 2-15 mg / L. As a specific example, the concentration of the organic pollutants in the wastewater containing organic pollutants can be 2 mg / L, 3 mg / L, 5 mg / L, 7 mg / L, 9 mg / L, 10 mg / L, 12 mg / L, 14 mg / L, or 15 mg / L.

[0036] In some preferred embodiments, the organic pollutant is Rhodamine B, and the electronegative dielectric material is fluorinated ethylene propylene copolymer, wherein the thickness of the fluorinated ethylene propylene copolymer is 25-50 μm.

[0037] In some preferred embodiments, the organic pollutant is gentian violet, and the electronegative dielectric material is fluorinated ethylene propylene copolymer, wherein the thickness of the fluorinated ethylene propylene copolymer is 25-50 μm.

[0038] In some embodiments, the method further includes: pretreating the wastewater containing organic pollutants to remove suspended or deposited solid impurities from the water body, so as to avoid the impurities interfering with the subsequent interface reaction process.

[0039] The present invention also provides Figure 1 The schematic diagram shown is of an apparatus for implementing the method of the present invention. The apparatus includes: a fluid guiding unit 1, a multiphase interface reaction substrate 2, and an effluent collection unit 3. The fluid guiding unit 1 is used to disperse the anhydrous material containing organic pollutants into continuous droplets. The multiphase interface reaction substrate 2 is disposed directly below the fluid guiding unit 1, and includes a substrate comprising a substrate and an electronegative dielectric material covering the surface of the substrate; The effluent collection unit 3 is located below the multiphase interface reaction substrate 2 and is used to collect the fluid purified by the in-situ oxidation-reduction reaction.

[0040] In some embodiments, the specific composition of the fluid guiding unit 1 is not strictly limited, and any device in the art that can disperse the wastewater containing organic pollutants and form it into continuous droplets is applicable.

[0041] In some preferred embodiments, the fluid guiding unit 1 employs a fluid distributor, wherein the fluid distributor includes a continuous fluid inlet 101, a water distribution main pipe 102, and a flexible hose 103.

[0042] The gravity-driven self-powered sewage purification method of the present invention will be further illustrated below through embodiments. These embodiments are implemented based on the technical solution of the present invention, providing detailed implementation methods and specific operating procedures; however, the scope of protection of the present invention is not limited to the following embodiments.

[0043] Unless otherwise specified, the experimental methods used in the following embodiments are conventional methods in the art. Unless otherwise specified, the experimental materials used in the following embodiments are commercially available.

[0044] In the following examples and comparative examples, aqueous solutions of Rhodamine B dye, Gentian Violet, Methyl Red, and Acid Yellow G were used as simulation systems to replace actual wastewater containing organic pollutants for relevant experiments and performance tests.

[0045] Example 1 This implementation is in Figure 1 The device shown in the schematic diagram includes: a fluid guiding unit 1, a multiphase interface reaction substrate 2, and an effluent collection unit 3. The fluid guiding unit 1 is a fluid distributor, which includes a continuous fluid inlet 101, a water distribution main pipe 102, and a hose 103. The substrate of the multiphase interface reaction substrate 2 is a 200mm×200mm flexible polyvinyl chloride (PVC) board, and the electronegative dielectric material covering the surface of the substrate is fluorinated ethylene propylene copolymer (FEP, purchased from Suzhou Zeyou Fluoroplastics Technology Co., Ltd.), and the thickness of the fluorinated ethylene propylene copolymer is 30μm. The water collection unit 3 is a PVC box.

[0046] The specific method is as follows: A 5 mg / L aqueous solution of Rhodamine B dye was dispersed using a fluid distributor to form a continuous droplet with a single drop volume of 40 μL; and the continuous droplet was dropped from a height of 40 cm onto the multiphase interface reaction substrate 2 under its own gravity.

[0047] Examples 2-8 The method described in Example 1 is implemented, except that the droplet drop heights are 50cm, 60cm, 70cm, 80cm, 100cm, 110cm, and 120cm.

[0048] Examples 9-12 The method described in Example 6 is implemented, except that the electronegative dielectric material coated on the substrate surface is polyvinyl chloride (purchased from Yide Industrial Technology Co., Ltd.), and the concentrations of the RhB solution are 2 mg / L, 5 mg / L, 8 mg / L and 15 mg / L, respectively.

[0049] Example 13 The method described in Example 6 is implemented, except that polydimethylsiloxane is used instead of fluorinated ethylene propylene copolymer.

[0050] Example 14 The method described in Example 6 is implemented, except that polyimide is used instead of fluorinated ethylene propylene copolymer.

[0051] Example 15 The method described in Example 6 is implemented, except that the organic pollutant is a gentian violet aqueous solution with a concentration of 5 mg / L, and the electronegative dielectric material is polyvinyl chloride.

[0052] Example 16 The method described in Example 6 is implemented, except that the organic pollutant is a methyl red aqueous solution with a concentration of 5 mg / L, and the electronegative dielectric material is polyvinyl chloride.

[0053] Example 17 The method described in Example 6 is implemented, except that the organic pollutant is an aqueous solution of acidic light yellow G with a concentration of 5 mg / L, and the electronegative dielectric material is polyvinyl chloride.

[0054] Comparative Examples 1-4 The method described in Example 1 is implemented, except that the droplet heights are 0cm, 10cm, 20cm and 30cm.

[0055] Comparative Example 5 The method described in Example 2 is implemented, except that the 5 mg / L Rhodamine B dye aqueous solution is not dispersed, but instead allowed to fall directly.

[0056] Test case (1) The present invention precharges the falling droplet (50cm high) with an additional charge (60V, 2A) using a DC power supply.

[0057] in, Figure 3 A comparison chart of the degradation rates of organic pollutants is presented between the blank test group (CK, corresponding to Example 6) without pre-charged additional charge and the test group pre-charged with additional charge. The results show that, under the same physical impact force, the degradation efficiency of the substrate with increased charge jumped from 45% to over 68%. This eliminates the contribution of physical mechanical impact to degradation and establishes the decisive role of charge density.

[0058] (2) This invention uses a droplet drop experiment to test the current and voltage signals generated by the friction between droplets of different volumes and the FEP film. The test results are as follows: Figure 5 As shown.

[0059] in, Figure 5 In the figure, (a) shows the current variation curves of different volume droplets rubbing against the FEP material, and (b) shows the voltage variation curves of different volume droplets rubbing against the FEP film. The test results show that when the droplet volume is too small, the amount of charge obtained through current integration is low; when the droplet volume is too large, it easily forms a water flow and splashes, which not only significantly reduces the amount of charge accumulation but also greatly reduces the effective utilization rate of the droplets. In the figure, "flow" represents water droplets falling directly without dispersion.

[0060] (3) The present invention uses the electrostatic induction measurement method based on the Faraday cup to measure the charge accumulation at the moment of impact in the test and comparative examples. The specific test process is as follows: The Faraday cup is placed below the reaction substrate and connected to a 6514 electrometer (Keithley). After the falling droplet interacts with the substrate and detaches, it enters the Faraday cup. The electrometer records the charge jump value caused by each droplet entering the cup. The average value of multiple measurements is taken as the net charge accumulation of a single impact. The results are shown in Table 1.

[0061] (4) The production of hydroxyl radicals in Example 6 and Comparative Example 1 was tested by high performance liquid chromatography (HPLC), and the results are shown in Table 1.

[0062] (5) The present invention uses ultraviolet-visible spectrophotometry to quantitatively analyze the concentration of pollutants in water samples before and after treatment. By using the different characteristic absorption peaks of each organic molecule, the type and concentration of dyes are determined, and the degradation rate of organic pollutants is further calculated. The results are shown in Table 1.

[0063] Table 1

[0064] As shown in Table 1, under static contact at 0 cm (Comparative Example 1), due to the lack of kinetic energy to trigger the rapid expansion of the three-phase contact line (TPCL), the system only produces weak background degradation (34%) and extremely low free radical production (23.79 µM). With increasing drop height, the increased droplet kinetic energy leads to enhanced interfacial charge compression, resulting in a significant positive correlation between degradation rate and free radical production. Performance peaks at 100 cm, where the degradation rate increases to 86% and hydroxyl radical production reaches 583.23 µM. This strongly demonstrates that the area around 100 cm is the optimal operating range for converting kinetic energy into a strong local electric field at the interface. However, when the height continues to increase to 110-120 cm... At a height of 80 cm, the excessive impact kinetic energy causes droplets to sputter and affects the continuous evolution path of TPCL, resulting in a decrease in charge accumulation and a drop in degradation rate to below 71%. This inverted U-shaped trend of "first rising and then falling" fully confirms that the present invention is not a simple triboelectric superposition, but a non-catalytic water purification achieved by precisely controlling the gravitational potential energy to trigger the SMIET mechanism. Its preferred height operating range is 80 cm to 110 cm.

[0065] The preferred embodiments of the present invention have been described in detail above; however, the present invention is not limited thereto. Within the scope of the inventive concept, various simple modifications can be made to the technical solutions of the present invention, including combinations of various technical features in any other suitable manner. These simple modifications and combinations should also be considered as the content disclosed in the present invention and are all within the protection scope of the present invention.

Claims

1. A gravity-driven, self-powered wastewater purification method, characterized in that, The method includes: dispersing wastewater containing organic pollutants to form continuous droplets with individual droplet volumes of 20-100 μL, and allowing the continuous droplets to fall onto a multiphase interface reaction substrate under their own gravity, wherein the droplet height of the continuous droplets is >30 cm, and the multiphase interface reaction substrate includes a substrate and an electronegative dielectric material covering the surface of the substrate.

2. The method according to claim 1, characterized in that, The volume of a single droplet in the continuous droplet is 30-50 μL.

3. The method according to claim 1 or 2, characterized in that, The process of dispersing wastewater containing organic pollutants is carried out in a fluid distributor, which is a discrete droplet generator with a porous array structure, wherein the inner diameter of a single outlet hole of the fluid distributor is 0.5-5 mm.

4. The method according to any one of claims 1-3, characterized in that, The droplet height of the continuous droplets is 40-120 cm, preferably 80-110 cm.

5. The method according to any one of claims 1-4, characterized in that, In the multiphase interface reaction substrate, the thickness of the electronegative dielectric material is 20-100 μm.

6. The method according to any one of claims 1-5, characterized in that, In the multiphase interfacial reaction substrate, the electronegative dielectric material is selected from at least one of fluorinated ethylene propylene copolymer, polyvinyl chloride, polytetrafluoroethylene, polydimethylsiloxane, polyimide, and polypropylene.

7. The method according to any one of claims 1-6, characterized in that, In the wastewater containing organic pollutants, the concentration of the organic pollutants is 1-100 mg / L, preferably 1.5-50 mg / L.

8. The method according to any one of claims 1-7, characterized in that, The organic pollutant is selected from at least one of gentian violet, rhodamine B, methyl red, malachite green, and acid yellow G.

9. The method according to claim 8, characterized in that, When the organic pollutant is Rhodamine B, the electronegative dielectric material is fluorinated ethylene propylene copolymer.

10. The method according to claim 8, characterized in that, When the organic pollutant is gentian violet, the electronegative dielectric material is fluorinated ethylene propylene copolymer.

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