Method for enhancing degradation of organic matter and power generation by coupling photocatalytic fuel cell with persulfate

Abstract

The present invention discloses a method for enhancing the degradation of organic matter and power generation by coupling a photocatalytic fuel cell with persulfate, comprising the following steps: Step 1, synthesis and preparation of Bi2WO6; Step 2, preparation of a binary composite; Step 3, synthesis of C3N4 qds; Step 4, preparation of a ternary composite; Step 5, synthesis of CuFe2O4; Step 6, preparation of a photoanode; Step 7, preparation of a photocathode; Step 8, construction of a coupling system; The present invention constructs a Bi2O4 / Bi2WO6 / C3N4 qds ternary Z-scheme heterojunction composite photoanode to improve the separation efficiency of photo-generated electron-hole pairs and enhance the sewage treatment and power generation performance of the battery. Using CuFe2O4 as the photocathode of the photocatalytic fuel cell to form a coupling system with persulfate, and utilizing its dual functions of enhancing the internal bias voltage due to the energy level difference with the photoanode and serving as a persulfate activation catalyst, further enhances the power generation performance of the coupling system and the degradation effect on organic matter.

Description

Technical Field

[0001] The invention relates to the technical field of photocatalytic fuel cells, in particular to a method for photocatalytic fuel cells coupled with persulfate to enhance organic matter degradation and electricity generation. Background Art

[0002] All countries in the world today are facing serious problems such as environmental pollution and energy shortage. Among them, antibiotic pollutants cannot be ignored. With the frequent detection of various antibiotics in water and soil environments, people have begun to realize that antibiotics remaining in the environment pose a huge threat to human health and ecosystem safety. Therefore, the treatment of this type of wastewater has become a hot topic in the field of water treatment research. Research in recent years has shown that organic wastewater contains a large amount of chemical energy. If energy recovery can be taken into account while efficiently removing pollutants, it will definitely be beneficial to the sustainable development of human society.

[0003] Photocatalytic fuel cells are a new technology with great application prospects. They have the functions of eliminating pollution and recycling energy. Under light, the photogenerated holes of the photoanode are used to oxidize and decompose organic matter. The generated photogenerated electrons are transferred to the cathode through an external circuit, thereby realizing the simultaneous degradation of organic matter and power generation. For photocatalytic fuel cells, the selection and design of electrode materials are crucial. Traditional photoanode materials mostly select single semiconductor materials. Due to the low separation efficiency of photogenerated electron-hole pairs, the pollution removal and power generation capabilities are not high. Studies have shown that compounding semiconductor materials with matching energy bands to construct Z-type heterojunction composite materials can not only effectively promote the separation of photogenerated electron-hole pairs, but also retain the stronger redox ability of the composite materials, thereby expected to improve the pollution removal and power generation performance of photocatalytic fuel cells. The three N-type semiconductor materials Bi2O4, Bi2WO6 and C3N4qds all have the advantages of non-toxicity, good stability and high photocatalytic activity, and are highly valued in the field of photocatalysis. However, the multi-component Z-type heterojunction composite materials composed of the three and their use as photoanodes for photocatalytic fuel cells have not been reported.

[0004] In recent years, advanced oxidation technologies based on the oxidation and decomposition of organic matter in water by sulfate radicals have developed rapidly. This technology has the advantages of fast reaction speed and wide application range. In addition, sulfate radicals have a high oxidation potential, strong oxidation ability, a long lifespan, which increases the chance of contact with pollutants and is conducive to the reaction. Moreover, it is less affected by pH and can be obtained by activating persulfate with various activation methods. The coupling technology with fuel cells has gradually emerged. The cathode of traditional photocatalytic fuel cells mostly uses the catalytic reduction of oxygen to establish an internal bias voltage through chemical reaction potential and drive electron transfer. Its function is single and it does not have the function of activating persulfate, so the improvement of the overall sewage treatment and power generation performance of photocatalytic fuel cells is limited. To solve this problem, a P-type semiconductor material with the function of activating persulfate can be selected as the photocathode. The energy level difference between the photoanode and the photocathode is used to enhance the internal bias voltage, promote the transfer of photo-generated electrons in the external circuit, and at the same time catalytically activate persulfate to generate strongly oxidizing sulfate radicals, which synergistically promote the degradation of organic matter and further improve the power generation ability with the photoanode. CuFe2O4 is a good transition metal composite material for activating persulfate and is also a P-type semiconductor. When used as a photocathode, it can simultaneously play the dual roles of transition metal activation and electroactivation in the activation of persulfate, thereby greatly improving the sewage treatment and power generation performance of the photocatalytic fuel cell coupled with the persulfate system. The use of CuFe2O4 as the photocathode of a photocatalytic fuel cell to activate persulfate to enhance the degradation of organic matter and power generation has not been reported. Summary of the Invention

[0005] The purpose of the present invention is to provide a method for enhancing the degradation of organic matter and power generation by coupling a photocatalytic fuel cell with persulfate to solve the problems raised in the above background technology.

[0006] To achieve the above purpose, the present invention provides the following technical solutions: A method for enhancing the degradation of organic matter and power generation by coupling a photocatalytic fuel cell with persulfate, including the following steps: Step 1, synthesis and preparation of Bi2WO6; Step 2, preparation of binary composite; Step 3, synthesis of C3N4 qds; Step 4, preparation of ternary composite; Step 5, synthesis of CuFe2O4; Step 6, preparation of photoanode; Step 7, preparation of photocathode; Step 8, construction of the coupling system;

[0007] Among them, in the above Step 1, 1-3 g of Bi(NO3)3·5H2O and 0.34-1.02 g of Na2WO4·2H2O are placed in 50 mL of deionized water, the pH of the solution is adjusted to 2, and after magnetic stirring for 0.5 h, the suspension is placed in a hydrothermal reaction kettle and hydrothermally treated at 170-190 °C for 16-24 h. After cooling to room temperature, the precipitate is collected by centrifugation, washed several times with ethanol and deionized water, and dried at 60 °C to obtain Bi2WO6;

[0008] In the above step 2, after the preparation of Bi2WO6 in step 1 is completed, 0.05 g of Bi2WO6 and 0.5 - 2 g of NaBiO3 are placed in 50 mL of deionized water. After magnetic stirring for 0.5 h, the suspension is placed in a hydrothermal reaction kettle. After cooling to room temperature, the precipitate is collected by centrifugation, washed several times with ethanol and deionized water, and then dried at 60 °C to obtain Bi2O4 / Bi2WO6;

[0009] In the above step 3, after the preparation of Bi2O4 / Bi2WO6 in step 2 is completed, 1 - 3 g of dicyandiamide is placed in a covered alumina crucible and calcined at 550 - 650 °C for 3 - 5 h in an air atmosphere. After cooling to room temperature, it is heated to 550 - 650 °C again for secondary calcination for 1 - 3 h to obtain a yellow sample. After thorough grinding, 0.1 - 0.3 g is taken and placed in a beaker. 15 - 25 mL of concentrated sulfuric acid and 50 - 70 mL of concentrated nitric acid are added successively, and ultrasonic treatment is carried out for 6 - 10 h. The obtained suspension is slowly poured into 400 mL of deionized water. After stirring for 0.5 h, it is filtered through a 0.1 μm membrane. The obtained solid is dispersed in 32 mL of deionized water and then poured into a hydrothermal reaction kettle for hydrothermal reaction. The obtained suspension is filtered through a 0.01 μm membrane, and the filtrate is freeze-dried at -80 °C to obtain C3N4qds;

[0010] In the above step 4, after the preparation of C3N4qds in step 3 is completed, 0.05 - 0.2 g of Bi2O4 / Bi2WO6 and C3N4qds are placed in 15 - 30 mL of methanol solution, and ultrasonic treatment is carried out for 0.5 - 1 h. Then it is evaporated to dryness in a water bath at 60 °C to obtain Bi2O4 / Bi2WO6 / C3N4qds;

[0011] In the above step 5, after the preparation of Bi2O4 / Bi2WO6 / C3N4qds in step 4 is completed, 0.01 - 0.03 mol of Cu(NO3)2·3H2O and 0.02 - 0.06 mol of Fe(NO3)3·9H2O are dissolved in 40 mL of deionized water. The mixed solution is magnetically stirred at 60 °C for 2 h, and then evaporated to dryness in a water bath at 90 °C. The precipitate is thoroughly ground and placed in a covered alumina crucible and calcined at 380 - 420 °C for 3 - 5 h in an air atmosphere. After cooling to room temperature, CuFe2O4 is obtained;

[0012] In the above step 6, after the synthesis of CuFe2O4 in step 5, 25 - 75 mg of Bi2O4 / Bi2WO6 / C3N4qds is placed in a beaker. 50 μL of Nafion solution and 500 μL of isopropanol are added successively, and ultrasonic treatment is carried out for 1 h. The dispersion is evenly drop-coated onto FTO conductive glass, and then sintered at 110 - 130 °C for 1 - 3 h. After cooling to room temperature, the Bi2O4 / Bi2WO6 / C3N4qds photoanode is obtained;

[0013] In the above step seven, after the photoanode is prepared in step six, 25-75 mg of CuFe2O4 is placed in a beaker, 50 μL of Nafion solution and 500 μL of isopropanol are added in sequence, sonicated for 1 h, and the dispersion is evenly drop-coated onto the FTO conductive glass. Then, it is sintered at 110-130 °C for 1-3 h. After cooling to room temperature, the CuFe2O4 photocathode is obtained.

[0014] In the above step eight, the Bi2O4 / Bi2WO6 / C3N4 qds photoanode and the CuFe2O4 photocathode are placed in a single-chamber quartz reactor containing organic wastewater, and are connected by wires to form a closed-loop circuit. Stir for 30 min under dark conditions for dark adsorption, and then turn on the light source to directly irradiate the surfaces of the photoanode and the photocathode to start the reaction, thus constructing a photocatalytic fuel cell. Before turning on the light source for irradiation, persulfate is added to the reactor, which is a coupled system of the photocatalytic fuel cell and persulfate.

[0015] Preferably, in the above step one, the molar ratio of Bi(NO3)3·5H2O to Na2WO4·2H2O is 2:1.

[0016] Preferably, in the above step two, the temperature of the hydrothermal reaction kettle is 150-170 °C, and the heating time is 8-12 h.

[0017] Preferably, in the above step three, the temperature of the hydrothermal reaction kettle is 190-210 °C, and the heating time is 8-12 h.

[0018] Preferably, in the above step four, the mass ratio of C3N4 qds is 1%-10%.

[0019] Preferably, in the above step five, the molar ratio of Cu(NO3)2·3H2O to Fe(NO3)3·9H2O is 1:2.

[0020] Preferably, in the above step eight, the persulfate is sodium persulfate or potassium persulfate, and the initial concentration of the persulfate is 0.5-2 mM.

[0021] Compared with the prior art, the beneficial effects of the present invention are as follows: By constructing a Bi2O4 / Bi2WO6 / C3N4qds ternary Z-scheme heterojunction composite photoanode, the present invention improves the separation efficiency of photogenerated electron-hole pairs, thereby enhancing the sewage treatment and power generation performance of the photocatalytic fuel cell. At the same time, using CuFe2O4 as the photocathode of the photocatalytic fuel cell and combining it with persulfate to form a coupling system, taking advantage of its energy level difference with the photoanode to enhance the internal bias voltage and its dual function as a persulfate activation catalyst, further strengthening the power generation and organic matter degradation effects of the coupling system. The photoanode material obtained by the present invention has a higher separation efficiency of photogenerated electron-hole pairs, the photocathode of the photocatalytic fuel cell has diverse functions, the coupling system with persulfate has stronger power generation ability and better pollutant degradation effect, and has potential application value in the field of wastewater treatment and resource utilization technology. BRIEF DESCRIPTION OF THE DRAWINGS

[0022] Figure 1 is a flowchart of the method of the present invention;

[0023] Figure 2 is a comparison chart of the degradation effects and power generation performances of different photoanodes of the photocatalytic fuel cell of the present invention;

[0024] Figure 3 is a diagram of the photocatalytic fuel cell of the present invention coupling with persulfate to enhance organic matter degradation and power generation. DETAILED DESCRIPTION OF THE EMBODIMENTS

[0025] The following will clearly and completely describe the technical solutions in the embodiments of the present invention with reference to the accompanying drawings in the embodiments of the present invention. Obviously, the described embodiments are only a part of the embodiments of the present invention, rather than all the embodiments. All other embodiments obtained by those of ordinary skill in the art based on the embodiments of the present invention without creative efforts shall fall within the protection scope of the present invention.

[0026] Please refer to Figures 1-3 , a method for photocatalytic fuel cell coupling with persulfate to enhance organic matter degradation and power generation, comprising the following steps: Step 1, synthesis and preparation of Bi2WO6; Step 2, preparation of binary composite; Step 3, synthesis of C3N4qds; Step 4, preparation of ternary composite; Step 5, synthesis of CuFe2O4; Step 6, preparation of photoanode; Step 7, preparation of photocathode; Step 8, construction of coupling system;

[0027] Among them, in the above Step 1, 2 g of Bi(NO3)3·5H2O and 0.68 g of Na2WO4·2H2O are placed in 50 mL of deionized water, the pH of the solution is adjusted to 2, after magnetic stirring for 0.5 h, the suspension is placed in a hydrothermal reaction kettle, hydrothermally reacted at 180 °C for 20 h, cooled to room temperature, the precipitate is collected by centrifugation, washed several times with ethanol and deionized water, and dried at 60 °C to obtain Bi2WO6;

[0028] In the above step 2, after the preparation of Bi2WO6 in step 1 is completed, 0.05 g of Bi2WO6 and 1.0 g of NaBiO3 are placed in 50 mL of deionized water. After magnetic stirring for 0.5 h, the suspension is placed in a hydrothermal reaction kettle, and the temperature of the hydrothermal reaction kettle is 160 °C, and the heating time is 10 h. After cooling to room temperature, the precipitate is collected by centrifugation, washed several times with ethanol and deionized water, and then dried at 60 °C to obtain Bi2O4 / Bi2WO6;

[0029] In the above step 3, after the preparation of Bi2O4 / Bi2WO6 in step 2 is completed, 2 g of dicyandiamide is placed in a covered alumina crucible and calcined at 600 °C for 4 h in an air atmosphere. After cooling to room temperature, it is heated to 600 °C again for secondary calcination for 2 h to obtain a yellow sample. After thorough grinding, 0.2 g is taken and placed in a beaker, and 20 mL of concentrated sulfuric acid and 60 mL of concentrated nitric acid are added in sequence. After ultrasonic treatment for 8 h, the obtained suspension is slowly poured into 400 mL of deionized water. After stirring for 0.5 h, it is filtered through a 0.1 μm membrane. The obtained solid is dispersed in 32 mL of deionized water and then poured into a hydrothermal reaction kettle for hydrothermal reaction. The temperature of the hydrothermal reaction kettle is 200 °C, and the heating time is 10 h. The obtained suspension is filtered through a 0.01 μm membrane, and the filtrate is freeze-dried at -80 °C to obtain C3N4qds;

[0030] In the above step 4, after the preparation of C3N4qds in step 3 is completed, 0.1 g of Bi2O4 / Bi2WO6 and C3N4qds are placed in 20 mL of methanol solution, and the mass ratio of C3N4qds is 2.5%. After ultrasonic treatment for 0.5 h, it is then evaporated to dryness in a water bath at 60 °C to obtain Bi2O4 / Bi2WO6 / C3N4qds;

[0031] In the above step 5, after the preparation of Bi2O4 / Bi2WO6 / C3N4qds in step 4 is completed, 0.02 mol of Cu(NO3)2·3H2O and 0.04 mol of Fe(NO3)3·9H2O are dissolved in 40 mL of deionized water. The mixed solution is magnetically stirred at 60 °C for 2 h, and then evaporated to dryness in a water bath at 90 °C. The precipitate is thoroughly ground and placed in a covered alumina crucible and calcined at 400 °C for 4 h in an air atmosphere. After cooling to room temperature, CuFe2O4 is obtained;

[0032] Among them, in the above step six, after the synthesis of CuFe2O4 in step five, 50 mg of Bi2O4 / Bi2WO6 / C3N4 qds is placed in a beaker, 50 μL of Nafion solution and 500 μL of isopropanol are added in sequence, ultrasonicated for 1 h, and the dispersion is evenly drop-coated onto the FTO conductive glass. Then, it is sintered at 120 °C for 2 h. After cooling to room temperature, the Bi2O4 / Bi2WO6 / C3N4 qds photoanode is obtained.

[0033] Among them, in the above step seven, after the preparation of the photoanode in step six, 50 mg of CuFe2O4 is placed in a beaker, 50 μL of Nafion solution and 500 μL of isopropanol are added in sequence, ultrasonicated for 1 h, and the dispersion is evenly drop-coated onto the FTO conductive glass. Then, it is sintered at 120 °C for 2 h. After cooling to room temperature, the CuFe2O4 photocathode is obtained.

[0034] Among them, in the above step eight, the Bi2O4 / Bi2WO6 / C3N4 qds photoanode and the CuFe2O4 photocathode are placed in a single-chamber quartz reactor containing the organic wastewater tetracycline, and are connected with wires to form a closed-loop circuit. Stir for 30 min under dark conditions for dark adsorption, and then turn on the light source to directly irradiate the surfaces of the photoanode and the photocathode to start the reaction, thus constructing a photocatalytic fuel cell. Before turning on the light source for irradiation, sodium persulfate is added to the reactor, and the initial concentration is 1 mM, which is the photocatalytic fuel cell and persulfate coupling system.

[0035] Based on the above, as Figure 2 shown, the Bi2O4 / Bi2WO6 / C3N4 qds photoanode fuel cell has the best degradation effect, and the pseudo-first-order kinetic constants are 1.25, 1.69, and 2.70 times those of the Bi2O4 / Bi2WO6, Bi2O4, and Bi2WO6 photoanode fuel cells, respectively. Similarly, the Bi2O4 / Bi2WO6 / C3N4 qds photoanode fuel cell has the strongest power generation performance, and its maximum power density is 1.56, 2.89, and 3.63 times those of the Bi2O4 / Bi2WO6, Bi2O4, and Bi2WO6 photoanode fuel cells, respectively; as Figure 3As shown, after adding 1 mM sodium persulfate to the reactor and constructing a photocatalytic fuel cell and persulfate coupling system, the sewage treatment and power generation capacity are greatly improved. Compared with the degradation rate of 51.9% of tetracycline by the single Bi2O4 / Bi2WO6 / C3N4 qds photoanode fuel cell, the sewage treatment effect of the coupling system is significantly improved, reaching 94.5%, and the power generation performance is simultaneously increased by 90%. The advantages of the present invention are as follows: when the present invention is used, a ternary Z-type heterojunction composite photoanode is constructed by combining three N-type semiconductors, Bi2O4, Bi2WO6, and C3N4 qds. The Z-type heterojunction is used to promote the separation of photo-generated electron-hole pairs, solving the problem of low separation efficiency of photo-generated electron-hole pairs in the photoanode of traditional photocatalytic fuel cells, thereby improving the sewage treatment and power generation performance of photocatalytic fuel cells. The present invention uses p-type semiconductor copper ferrite as the photocathode. While enhancing the internal bias voltage and promoting the transfer of photo-generated electrons in the external circuit, it is used as a persulfate activation catalyst. Under the dual activation of transition metal activation and electroactivation, the generation of strongly oxidizing sulfate radicals is promoted, solving the problems of single function and low efficiency of the cathode of traditional photocatalytic fuel cells. Under the dual functions of the CuFe2O4 photocathode, the sewage treatment and power generation performance of the photocatalytic fuel cell coupling persulfate system are greatly improved.

[0036] For those skilled in the art, it is obvious that the present invention is not limited to the details of the above exemplary embodiments, and the present invention can be implemented in other specific forms without departing from the spirit or basic characteristics of the present invention. Therefore, from any point of view, the embodiments should be regarded as exemplary and non-limiting. The scope of the present invention is defined by the appended claims rather than the above description. Therefore, all changes falling within the meaning and scope of the equivalent elements of the claims are intended to be included in the present invention. Any reference signs in the claims should not be regarded as limiting the claims involved.

Claims

1. A method for enhancing the degradation of organic matter and power generation by coupling photocatalytic fuel cells with persulfate, comprising the following steps: Step 1: Synthesis and preparation of Bi2WO6; Step 2: Preparation of binary composite; Step 3: Synthesis of C3N4qds; Step 4: Preparation of ternary composite; Step 5: Synthesis of CuFe2O4; Step 6: Preparation of photoanode; Step 7: Preparation of photocathode; Step 8: Assembly of coupling system; It is characterized in that: In the above Step 1, 1 - 3 g of Bi(NO3)3·5H2O and 0.34 - 1.02 g of Na2WO4·2H2O are placed in 50 mL of deionized water. The pH of the solution is adjusted to 2. After magnetic stirring for 0.5 h, the suspension is placed in a hydrothermal reaction kettle and hydrothermally treated at 170 - 190 °C for 16 - 24 h. After cooling to room temperature, the precipitate is collected by centrifugation, washed several times with ethanol and deionized water, and then dried at 60 °C to obtain Bi2WO6. In the above Step 2, after the preparation of Bi2WO6 in Step 1 is completed, 0.05 g of Bi2WO6 and 0.5 - 2 g of NaBiO3 are placed in 50 mL of deionized water. After magnetic stirring for 0.5 h, the suspension is placed in a hydrothermal reaction kettle. After cooling to room temperature, the precipitate is collected by centrifugation, washed several times with ethanol and deionized water, and then dried at 60 °C to obtain Bi2O4 / Bi2WO6. In the above Step 3, after the preparation of Bi2O4 / Bi2WO6 in Step 2 is completed, 1 - 3 g of dicyandiamide is placed in a covered alumina crucible and calcined at 550 - 650 °C for 3 - 5 h in an air atmosphere. After cooling to room temperature, it is heated to 550 - 650 °C again for secondary calcination for 1 - 3 h to obtain a yellow sample. After sufficient grinding, 0.1 - 0.3 g is taken and placed in a beaker. 15 - 25 mL of concentrated sulfuric acid and 50 - 70 mL of concentrated nitric acid are added successively. After ultrasonic treatment for 6 - 10 h, the obtained suspension is slowly poured into 400 mL of deionized water. After stirring for 0.5 h, it is filtered through a 0.1 μm membrane. The obtained solid is dispersed in 32 mL of deionized water and then poured into a hydrothermal reaction kettle for hydrothermal reaction. The obtained suspension is filtered through a 0.01 μm membrane, and the filtrate is freeze-dried at -80 °C to obtain C3N4qds. In the above Step 4, after the preparation of C3N4qds in Step 3 is completed, 0.05 - 0.2 g of Bi2O4 / Bi2WO6 and C3N4qds are placed in 15 - 30 mL of methanol solution. After ultrasonic treatment for 0.5 - 1 h, it is then evaporated to dryness in a water bath at 60 °C to obtain Bi2O4 / Bi2WO6 / C3N4qds. In the above Step 5, after the preparation of Bi2O4 / Bi2WO6 / C3N4qds in Step 4 is completed, 0.01 - 0.03 mol of Cu(NO3)2·3H2O and 0.02 - 0.06 mol of Fe(NO3)3·9H2O are dissolved in 40 mL of deionized water. The mixed solution is magnetically stirred at 60 °C for 2 h, and then evaporated to dryness in a 90 °C water bath. The precipitate is sufficiently ground and placed in a covered alumina crucible and calcined at 380 - 420 °C for 3 - 5 h in an air atmosphere. After cooling to room temperature, CuFe2O4 is obtained. In the above step six, after the synthesis of CuFe2O4 in step five, 25 - 75 mg of Bi2O4 / Bi2WO6 / C3N4 qds is placed in a beaker, 50 μL of Nafion solution and 500 μL of isopropanol are added in sequence, sonicated for 1 h, and the dispersion is evenly drop-coated onto the FTO conductive glass. Then, it is sintered at 110 - 130 °C for 1 - 3 h. After cooling to room temperature, the Bi2O4 / Bi2WO6 / C3N4 qds photoanode is obtained. In the above step seven, after the preparation of the photoanode in step six, 25 - 75 mg of CuFe2O4 is placed in a beaker, 50 μL of Nafion solution and 500 μL of isopropanol are added in sequence, sonicated for 1 h, and the dispersion is evenly drop-coated onto the FTO conductive glass. Then, it is sintered at 110 - 130 °C for 1 - 3 h. After cooling to room temperature, the CuFe2O4 photocathode is obtained. In the above step eight, the Bi2O4 / Bi2WO6 / C3N4 qds photoanode and the CuFe2O4 photocathode are placed in a single-chamber quartz reactor containing organic wastewater, connected with wires to form a closed-loop circuit, stirred for 30 min under dark conditions for dark adsorption, and then the light source is turned on to directly irradiate the surfaces of the photoanode and the photocathode to start the reaction, thus constructing a photocatalytic fuel cell. Before turning on the light source for irradiation, persulfate is added to the reactor, which is a photocatalytic fuel cell and persulfate coupling system.

2. The method for enhancing the degradation of organic matter and power generation by photocatalytic fuel cell coupled with persulfate according to claim 1, characterized in that: In the above step one, the molar ratio of Bi(NO3)3·5H2O to Na2WO4·2H2O is 2:

1.

3. The method for enhancing the degradation of organic matter and power generation by photocatalytic fuel cell coupled with persulfate according to claim 1, wherein: In the above step two, the temperature of the hydrothermal reaction kettle is 150 - 170 °C, and the heating time is 8 - 12 h.

4. The method for enhancing the degradation of organic matter and power generation by coupling photocatalytic fuel cell with persulfate according to claim 1, wherein: In the above step three, the temperature of the hydrothermal reaction kettle is 190 - 210 °C, and the heating time is 8 - 12 h.

5. The method for enhancing the degradation of organic matter and power generation by coupling photocatalytic fuel cell with persulfate according to claim 1, characterized in that: In the above step four, the mass ratio of C3N4 qds is 1% - 10%.

6. The method for photocatalytic fuel cell coupled with persulfate to enhance the degradation of organic matter and power generation according to claim 1, characterized in that: In the above step five, the molar ratio of Cu(NO3)2·3H2O to Fe(NO3)3·9H2O is 1:

2.

7. The method for enhancing the degradation of organic matter and power generation by coupling photocatalytic fuel cells with persulfate according to claim 1, wherein: In the above step eight, the persulfate is sodium persulfate or potassium persulfate, and the initial concentration of the persulfate is 0.5 - 2 mM.

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