Spongy composite membrane material based on micro-flower-shaped catalyst and application of spongy composite membrane material in room-temperature formaldehyde degradation
By combining Pt@δ-MnO2@MnCo2O4 microflower catalyst with sponge-like conductive cotton and applying a tiny voltage, the problem of insufficient catalytic degradation activity of existing composite film materials at room temperature is solved, and efficient and stable formaldehyde removal is achieved without light activation.
Patent Information
- Application Number
- CN202510066401.5
- Authority / Receiving Office
- CN · China
- Patent Type
- Applications(China)
- Current Assignee / Owner
- Filing Date
- 2025-01-16
- Publication Date
- 2025-05-06
AI Technical Summary
The existing composite film materials have insufficient catalytic degradation activity for low concentrations of formaldehyde at room temperature, and are highly dependent on light and heat, which cannot meet application needs.
The Pt@δ-MnO2@MnCo2O4 microflower catalyst is used to combine with the spongy conductive cotton film, and the catalytic oxidation and degradation of formaldehyde at room temperature is achieved by applying a small voltage to activate the catalyst.
It can significantly catalyze the oxidation of formaldehyde at room temperature, reduce the formaldehyde concentration to the internationally stipulated safe range, and does not require light activation, and has high stability and sustainable use.
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Figure CN119926422A_ABST
Abstract
Description
Technical Field
[0001] The invention relates to the field of composite membrane materials, in particular to a novel sponge-like composite membrane material with room temperature electrocatalytic formaldehyde degradation activity. Background Art
[0002] In the prior art, a variety of mature methods have been developed for the treatment of formaldehyde, such as absorption, adsorption and catalytic degradation. However, how to further reduce the formaldehyde concentration from a lower level to an extremely low concentration that meets human health standards remains a key challenge in the field of indoor formaldehyde pollution control. This technical difficulty is regarded as the last step to achieve safe air quality. Previous studies have shown that transition metal oxides, especially MnO2 catalysts, are widely used in the catalytic oxidation treatment of formaldehyde. Among them, δ-MnO2 has attracted much attention due to its superior catalytic performance. However, the catalytic degradation activity of δ-MnO2 for formaldehyde at room temperature is not sufficient and cannot meet application requirements. Although the catalytic temperature can be significantly reduced and even room temperature catalysis can be achieved by loading precious metal catalysts such as platinum (Pt), such catalysts are often highly dependent on light conditions, which is a major limitation in their use.
[0003] In view of the above problems, it is urgent to develop a catalyst that can catalyze the oxidation degradation of low-concentration formaldehyde at room temperature, especially in indoor conditions with insufficient light. The n-type semiconductor MnCo2O4 has attracted widespread attention due to its narrow band gap, high catalytic activity, excellent chemical stability and environmental friendliness, and is regarded as an ideal carrier material due to its excellent oxygen reduction reaction (ORR) activity and high stability. Pt@δ-MnO2 is loaded on micro-flower-like MnCo2O4 to form a Pt@δ-MnO2@MnCo2O4 micro-flower-like catalyst, which is then combined with a sponge-like conductive cotton film to construct a sponge-like composite film material with catalytic activity. When a small voltage is applied to the composite film material, the sponge-like conductive cotton can transfer electrons to MnCo2O4, which, as a carrier, can effectively transfer electrons to δ-MnO2 through uniformly dispersed Pt nanoparticles, thereby activating oxygen vacancies on the catalyst surface and promoting the catalytic reaction. This design can effectively reduce the dependence of traditional formaldehyde catalysts on light and heat.
[0004] Therefore, this patent discloses a sponge-like composite membrane material based on a micro-flower-like catalyst, aiming to effectively solve the problem of catalytic degradation of low-concentration formaldehyde at room temperature. Summary of the invention
[0005] In view of this, the technical problem to be solved by the present invention is that the existing composite membrane materials have the problems of complex preparation process, poor catalytic degradation performance of pollutants, and high dependence on light and heat.
[0006] In view of the above technical problems, the present invention proposes a sponge-like composite membrane material based on a micro-flower-like catalyst and a preparation method thereof, which can significantly catalyze the oxidation of formaldehyde at room temperature and reduce the concentration of formaldehyde.
[0007] The present invention provides the following technical solutions:
[0008] The composite membrane material is composed of Pt@δ-MnO2@MnCo2O4 micro-flower-like catalyst particles and sponge-like conductive cotton film. By applying a small voltage to the composite membrane, a catalytic reaction is carried out at room temperature without the need for light activation, which can effectively remove trace formaldehyde gas in the room.
[0009] The Pt@δ-MnO2@MnCo2O4 catalyst is composed of micro-flower-shaped MnCo2O4 stably loaded with δ-MnO2 particles and Pt nanoparticles. The specific preparation method includes the following steps:
[0010] Step 1, preparation of MnCo2O4 carrier: Mn(CH3COO)2·4H2O and Co(CH3COO)2·4H2O are used as raw materials and a MnCo2O4 precursor is prepared by a solvothermal method, and then a MnCo2O4 micro-flower is obtained by heat treatment in an air atmosphere;
[0011] Step 2, preparation of δ-MnO2@MnCo2O4: δ-MnO2 is loaded on MnCo2O4 microflowers by a deposition-precipitation method, and a heterojunction is formed between δ-MnO2 and MnCo2O4, and then δ-MnO2@MnCo2O4 is obtained after centrifugation, washing, and vacuum drying;
[0012] Step 3. Preparation of Pt@δ-MnO2@MnCo2O4: Use H2PtCl6·6H2O and NaBH4 to in situ synthesize Pt nanoparticles on the surface of δ-MnO2@MnCo2O4 to prepare Pt@δ-MnO2@MnCo2O4 micro-flower-like composite catalyst.
[0013] The composite membrane material is a sponge-like composite membrane material with electrocatalytic activity formed by uniformly dispersing the Pt@δ-MnO2@MnCo2O4 catalyst prepared by the above steps in the conductive cotton.
[0014] In the composite film material, the conductive cotton is anti-interference electromagnetic shielding cotton, and the overall thickness is 0.8 mm.
[0015] The said small voltage is applied to the composite film, and the said small voltage can be realized by a button battery, a lithium-ion battery or a USB step-down power supply. (Applied voltage range: 0.5V to 3.0V)
[0016] The composite membrane material of the present invention can be treated with electrocatalysis for 12 hours at room temperature (20°C to 25°C) to reduce the initial concentration of 0.80 mg / m 3 The formaldehyde content was reduced to 0.07mg / m 3 , reaching the internationally prescribed safety concentration range.
[0017] The composite film material according to the present invention does not need to be activated and can be used continuously, thereby solving the environmental pollution problem of building decoration materials that continuously release formaldehyde.
[0018] The present invention discloses the following technical effects:
[0019] (1) The composite membrane material prepared by the present invention has both high stability and catalytic activity, providing good conditions for subsequent catalysis.
[0020] (2) The present invention studies the catalytic performance of the composite membrane material electrocatalyst at different voltages and different initial formaldehyde concentrations at room temperature (20°C to 25°C). The results show that when a voltage of 3.0V is applied and the initial formaldehyde concentration is 0.80mg / m 3 The catalyst has good formaldehyde removal performance.
[0021] (3) The process of the present invention has a simple preparation route and mild reaction conditions. The reaction process is highly controllable, and materials with different properties can be obtained as needed by changing the reaction conditions and various experimental variables. BRIEF DESCRIPTION OF THE DRAWINGS
[0022] Figure 1 This is a physical picture of the new sponge-like composite membrane material with electrocatalytic activity prepared in Example 1 of the present invention. DETAILED DESCRIPTION
[0023] The specific embodiments of the present invention are given below. The specific embodiments are only used to further illustrate the present invention in detail and do not limit the protection scope of the claims of the present invention.
[0024] A sponge-like composite membrane material based on micro-flower-like catalyst,
[0025] The composite membrane material is composed of Pt@δ-MnO2@MnCo2O4 micro-flower-shaped catalyst particles and sponge-like conductive cotton film;
[0026] By applying a small voltage to the composite membrane and undergoing a catalytic reaction at room temperature, without the need for light activation, trace formaldehyde gas in the room can be effectively removed, so that the indoor formaldehyde concentration reaches the safe concentration range specified in the national standard GB / T18883-2022.
[0027] The Pt@δ-MnO2@MnCo2O4 catalyst is composed of micro-flower-like MnCo2O4 stably loaded with δ-MnO2 particles and Pt nanoparticles. The specific preparation method includes the following steps:
[0028] Step 1, preparation of MnCo2O4 carrier: Mn(CH3COO)2·4H2O and Co(CH3COO)2·4H2O are used as raw materials and a MnCo2O4 precursor is prepared by a solvothermal method, and then a MnCo2O4 micro-flower is obtained by heat treatment in an air atmosphere;
[0029] Step 2, preparation of δ-MnO2@MnCo2O4: δ-MnO2 is loaded on MnCo2O4 microflowers by a deposition-precipitation method, and a heterojunction is formed between δ-MnO2 and MnCo2O4, and then δ-MnO2@MnCo2O4 is obtained after centrifugation, washing, and vacuum drying;
[0030] Step 3. Preparation of Pt@δ-MnO2@MnCo2O4: Use H2PtCl6·6H2O and NaBH4 to in situ synthesize Pt nanoparticles on the surface of δ-MnO2@MnCo2O4 to prepare Pt@δ-MnO2@MnCo2O4 micro-flower-like composite catalyst.
[0031] Furthermore, the Pt@δ-MnO2@MnCo2O4 catalyst prepared in the above steps is uniformly dispersed in the conductive cotton to form a sponge-like composite membrane material with electrocatalytic activity.
[0032] Furthermore, in the prepared composite film material, the conductive cotton is anti-interference electromagnetic shielding cotton, and the overall thickness is 0.8 mm.
[0033] Furthermore, when applying a small voltage to the composite film, the applied voltage can be realized by a button battery, a lithium-ion battery or a USB step-down power supply. (Applied voltage range: 0.5V to 3.0V)
[0034] Furthermore, the application of the prepared composite membrane material under room temperature conditions is characterized in that: under room temperature (20°C to 25°C), electrocatalysis for 12 hours can reduce the initial concentration of 0.80 mg / m 3 The formaldehyde content was reduced to 0.07mg / m 3 , reaching the internationally prescribed safety concentration range.
[0035] Furthermore, the application of the prepared composite membrane material under room temperature conditions is characterized in that: the catalyst does not need to be activated and can be used continuously, thereby solving the environmental pollution problem of building decoration materials that continuously release formaldehyde.
[0036] In the embodiment of the present invention, the electrocatalytic oxidation of formaldehyde test analysis is as follows: the composite membrane material has significant catalytic performance at room temperature (20°C to 25°C) at different voltages and different initial formaldehyde concentrations. The results show that when a voltage of 3V is applied and the initial formaldehyde concentration is 0.80mg / m 3 After catalytic reaction, the formaldehyde concentration can be reduced to 0.07 mg / m 3 , the catalytic efficiency is 91%. Even after 7 cycles of experiments, the catalytic efficiency of the catalyst can still be maintained at 90%.
[0037] The morphology characterization test methods of the composite membrane materials are transmission electron microscopy (TEM), scanning electron microscopy (SEM), Fourier transform infrared spectroscopy (FTIR), X-ray diffraction (XRD), X-ray photoelectron surface spectroscopy (XPS), BET, electrochemical impedance spectroscopy (EIS), and cyclic voltammetry (CV).
[0038] Catalytic test: According to the national standard GB18580-2017, the 1m 3 In the box, the formaldehyde catalytic performance test was carried out using a completely mixed batch mode.
[0039] Example 1
[0040] (1) First, take a clean 250mL round-bottom flask and add 2.5mL deionized water and 200mL ethylene glycol. Weigh 0.6125g manganese acetate (Mn(CH3COO)2·4H2O) and 1.245g cobalt acetate (Co(CH3COO)2·4H2O) and add them to the round-bottom flask. Seal the round-bottom flask with sealing glue and stir it on a magnetic stirrer until a transparent solution is obtained. Add 0.5475g polyvinyl pyrrolidone (PVP) to the above solution, transfer the resulting solution to a Teflon-lined stainless steel autoclave, place it in an oven, and react at 180℃ for 12h. After cooling naturally to room temperature, take out the autoclave, pour the solution in the liner into a centrifuge tube, set the speed to 10000r / min, centrifuge for 10min, obtain the cobalt-manganese compound by centrifugation, and continue to centrifuge and wash it 4 times with distilled water and ethanol. Dry the precipitate in air at 80℃ for 10h. The temperature was raised to 500°C in air at a heating rate of 2°C / min, and then heat-treated for 4 hours (a total of 8 hours and 10 minutes), and then naturally cooled to room temperature to obtain micro-flower-like MnCo2O4.
[0041] (2) Weigh 0.2g of the synthesized micro-flower-like MnCo2O4 powder into a 50mL round-bottom flask, add 30mL of deionized water, and stir magnetically for 15min to make it uniformly dispersed. After uniform dispersion, add 0.05g of KMnO4 and MnSO4·H2O, heat and stir in a 60℃ water bath for 3h, transfer the precipitate produced after the reaction to a 50mL centrifugal tube, centrifuge at a speed of 10000r / min for 10min, wash with deionized water by centrifugation 4 times, and transfer the material after the last centrifugation to a vacuum drying oven and vacuum dry at 25℃ for 12h.
[0042] (3) Dissolve 1g of chloroplatinic acid hexahydrate (H2PtCl6·6H2O) in 20mL of water to obtain a chloroplatinic acid solution with a concentration of 0.09654mol / L. Weigh 0.5g of the MnCo2O4 powder loaded with δ-MnO2 in the above step into a 50mL round-bottom flask, stir magnetically for 15min, disperse in 10mL of deionized water, measure a certain volume of 0.09654mol / L chloroplatinic acid solution (Pt loading is 0.1wt%), insert the needle below the liquid level of the round-bottom flask, add it, seal it and avoid light, stir magnetically for 12h. Weigh 0.0189g of NaBH4 and 0.02g of NaOH in a 50mL beaker, add 5mL of deionized water, stir thoroughly to dissolve, quickly add it to the round-bottom flask, seal it and stir it for 30min. The above solution was centrifuged at a speed of 10000r / min, and washed with deionized water for 4 times. Ultrasonic dispersion treatment was performed for 10 minutes between each washing. After the last centrifugation, the supernatant was poured out and the obtained product was placed in an oven and dried at 80°C for 8h.
[0043] 1.0 g of the Pt@δ-MnO2@MnCo2O4 catalyst prepared in the above steps was uniformly dispersed in a 5 cm × 8 cm conductive cotton to form a sponge-like composite membrane material with electrocatalytic activity, such as Figure 1 shown.
[0044] Effect experiment:
[0045] The prepared composite membrane material was placed at a temperature of 25°C, a humidity of 50%, an applied voltage of 3.0 V, and an initial formaldehyde concentration of 0.80 mg / m 3 The catalytic performance of formaldehyde was tested under the conditions of . The catalytic efficiency of formaldehyde within 12 hours was 91%, reaching 0.07mg / m 3 After 7 cycles of experiments, the formaldehyde removal rate can still reach 90%.
[0046] Example 2
[0047] (1) First, take a clean 250mL round-bottom flask and add 2.5mL deionized water and 200mL ethylene glycol. Weigh 0.6125g manganese acetate (Mn(CH3COO)2·4H2O) and 1.245g cobalt acetate (Co(CH3COO)2·4H2O) and add them to the round-bottom flask. Seal the round-bottom flask with sealing glue and stir it on a magnetic stirrer until a transparent solution is obtained. Add 0.5475g polyvinyl pyrrolidone (PVP) to the above solution, transfer the resulting solution to a Teflon-lined stainless steel autoclave, place it in an oven, and react at 180℃ for 12h. After cooling naturally to room temperature, take out the autoclave, pour the solution in the liner into a centrifuge tube, set the speed to 10000r / min, centrifuge for 10min, obtain the cobalt-manganese compound by centrifugation, and continue to centrifuge and wash it 4 times with distilled water and ethanol. Dry the precipitate in air at 80℃ for 10h. The temperature was raised to 500°C in air at a heating rate of 2°C / min, and then heat-treated for 4 hours (a total of 8 hours and 10 minutes), and then naturally cooled to room temperature to obtain micro-flower-like MnCo2O4.
[0048] (2) Weigh 0.2g of the synthesized micro-flower-like MnCo2O4 powder into a 50mL round-bottom flask, add 30mL of deionized water, and stir magnetically for 15min to make it uniformly dispersed. After uniform dispersion, add 0.05g of KMnO4 and MnSO4·H2O, heat and stir in a 60℃ water bath for 3h, transfer the precipitate produced after the reaction to a 50mL centrifugal tube, centrifuge at a speed of 10000r / min for 10min, wash with deionized water by centrifugation 4 times, and transfer the material after the last centrifugation to a vacuum drying oven and vacuum dry at 25℃ for 12h.
[0049] (3) Dissolve 1g of chloroplatinic acid hexahydrate (H2PtCl6·6H2O) in 20mL of water to obtain a chloroplatinic acid solution with a concentration of 0.09654mol / L. Weigh 0.5g of the MnCo2O4 powder loaded with δ-MnO2 in the above step into a 50mL round-bottom flask, stir magnetically for 15min, disperse in 10mL of deionized water, measure a certain volume of 0.09654mol / L chloroplatinic acid solution (Pt loading is 0.1wt%), insert the needle below the liquid level of the round-bottom flask, add it, seal it and avoid light, stir magnetically for 12h. Weigh 0.0189g of NaBH4 and 0.02g of NaOH in a 50mL beaker, add 5mL of deionized water, stir thoroughly to dissolve, quickly add it to the round-bottom flask, seal it and stir it for 30min. The above solution was centrifuged at a speed of 10000r / min, and washed with deionized water for 4 times. Ultrasonic dispersion treatment was performed for 10 minutes between each washing. After the last centrifugation, the supernatant was poured out and the obtained product was placed in an oven and dried at 80°C for 8h.
[0050] 1.0 g of the Pt@δ-MnO2@MnCo2O4 catalyst prepared in the above steps was uniformly dispersed in 5 cm×8 cm conductive cotton to form a sponge-like composite membrane material with electrocatalytic activity.
[0051] Effect experiment:
[0052] The prepared composite membrane material was placed at a temperature of 25°C, a humidity of 50%, an applied voltage of 2.0 V, and an initial formaldehyde concentration of 0.80 mg / m 3 The catalytic performance of formaldehyde was tested under the conditions of . The catalytic efficiency of formaldehyde within 12 hours was 89%, reaching 0.096mg / m 3 After 7 cycles of experiments, the formaldehyde removal rate was 88%.
[0053] Example 3
[0054] (1) First, take a clean 250mL round-bottom flask and add 2.5mL deionized water and 200mL ethylene glycol. Weigh 0.6125g manganese acetate (Mn(CH3COO)2·4H2O) and 1.245g cobalt acetate (Co(CH3COO)2·4H2O) and add them to the round-bottom flask. Seal the round-bottom flask with sealing glue and stir it on a magnetic stirrer until a transparent solution is obtained. Add 0.5475g polyvinyl pyrrolidone (PVP) to the above solution, transfer the resulting solution to a Teflon-lined stainless steel autoclave, place it in an oven, and react at 180℃ for 12h. After cooling naturally to room temperature, take out the autoclave, pour the solution in the liner into a centrifuge tube, set the speed to 10000r / min, centrifuge for 10min, obtain the cobalt-manganese compound by centrifugation, and continue to centrifuge and wash it 4 times with distilled water and ethanol. Dry the precipitate in air at 80℃ for 10h. The temperature was raised to 500°C in air at a heating rate of 2°C / min, and then heat-treated for 4 hours (a total of 8 hours and 10 minutes), and then naturally cooled to room temperature to obtain micro-flower-like MnCo2O4.
[0055] (2) Weigh 0.2g of the synthesized micro-flower-like MnCo2O4 powder into a 50mL round-bottom flask, add 30mL of deionized water, and stir magnetically for 15min to make it uniformly dispersed. After uniform dispersion, add 0.05g of KMnO4 and MnSO4·H2O, heat and stir in a 60℃ water bath for 3h, transfer the precipitate produced after the reaction to a 50mL centrifugal tube, centrifuge at a speed of 10000r / min for 10min, wash with deionized water by centrifugation 4 times, and transfer the material after the last centrifugation to a vacuum drying oven and vacuum dry at 25℃ for 12h.
[0056] (3) Dissolve 1g of chloroplatinic acid hexahydrate (H2PtCl6·6H2O) in 20mL of water to obtain a chloroplatinic acid solution with a concentration of 0.09654mol / L. Weigh 0.5g of the MnCo2O4 powder loaded with δ-MnO2 in the above step into a 50mL round-bottom flask, stir magnetically for 15min, disperse in 10mL of deionized water, measure a certain volume of 0.09654mol / L chloroplatinic acid solution (Pt loading is 0.1wt%), insert the needle below the liquid level of the round-bottom flask, add it, seal it and avoid light, stir magnetically for 12h. Weigh 0.0189g of NaBH4 and 0.02g of NaOH in a 50mL beaker, add 5mL of deionized water, stir thoroughly to dissolve, quickly add it to the round-bottom flask, seal it and stir it for 30min. The above solution was centrifuged at a speed of 10000r / min, and washed with deionized water for 4 times. Ultrasonic dispersion treatment was performed for 10 minutes between each washing. After the last centrifugation, the supernatant was poured out and the obtained product was placed in an oven and dried at 80°C for 8h.
[0057] 1.0 g of the Pt@δ-MnO2@MnCo2O4 catalyst prepared in the above steps was uniformly dispersed in 5 cm×8 cm conductive cotton to form a sponge-like composite membrane material with electrocatalytic activity.
[0058] Effect experiment:
[0059] The prepared composite membrane material was placed at a temperature of 25°C, a humidity of 50%, an applied voltage of 3.0 V, and an initial formaldehyde concentration of 0.50 mg / m 3 The catalytic performance of formaldehyde was tested under the conditions of . The catalytic efficiency of formaldehyde was 87% within 12 hours, reaching 0.065mg / m 3 After 7 cycles of experiments, the formaldehyde removal rate was 86%.
[0060] The above description is only a preferred embodiment of the present invention, and is not intended to limit the protection scope of the present application. Any technician familiar with the field can make equivalent substitutions or changes based on the technical solutions and inventive concepts of the present invention within the technical content disclosed in the present invention, which should be covered by the protection scope of the present invention.
Claims
1. A sponge-like composite membrane material based on a micro-flower-like catalyst for catalytic degradation of indoor formaldehyde, characterized in that: The composite membrane material is composed of Pt@δ-MnO2@MnCo2O4 micro-flower-shaped catalyst particles and sponge-like conductive cotton film; By applying a small voltage to the composite membrane and undergoing a catalytic reaction at room temperature, without the need for light activation, trace formaldehyde gas in the room can be effectively removed, so that the indoor formaldehyde concentration reaches the safe concentration range specified in the national standard GB / T18883-2022.
2. The novel composite membrane material according to claim 1, wherein the Pt@δ-MnO2@MnCo2O4 catalyst is a composite of micro-flower-shaped MnCo2O4 stably loaded with δ-MnO2 particles and Pt nanoparticles, and the diameter of the micro-flower is 1.5μm to 2.0μm; The specific preparation method comprises the following steps: Step 1: Preparation of MnCo2O4 carrier: Mn(CH3COO)2·4H2O and Co(CH S COO)2·4H2O was used as raw material and MnCo2O4 precursor was prepared by solvothermal method, and MnCo2O4 microflowers were obtained by heat treatment in air atmosphere. Step 2, preparation of δ-MnO2@MnCo2O4: δ-MnO2 is loaded on MnCo2O4 microflowers by a deposition-precipitation method, and a heterojunction is formed between δ-MnO2 and MnCo2O4, and then δ-MnO2@MnCo2O4 is obtained after centrifugation, washing, and vacuum drying; Step 3. Preparation of Pt@δ-MnO2@MnCo2O4: Use H2PtCl6·6H2O and NaBH4 to in situ synthesize Pt nanoparticles on the surface of δ-MnO2@MnCo2O4 to prepare Pt@6-MnO2@MnCo2O4 micro-flower-like composite catalyst.
3. The material according to claim 1, characterized in that: The prepared Pt@δ-MnO2@MnCo2O4 catalyst is uniformly dispersed in the conductive cotton to form a sponge-like composite membrane material with electrocatalytic activity.
4. The conductive cotton according to claim 3, characterized in that: The sponge-like conductive cotton film is an anti-interference electromagnetic shielding cotton with an overall thickness of 0.8mm.
5. The micro voltage according to claim 1, characterized in that: The applied voltage can be achieved by a button battery, lithium-ion battery or USB step-down power supply. (Applied voltage range: 0.5V ~ 3.0V) 6. The use of the composite membrane material according to claim 1 at room temperature, characterized in that: Under room temperature (20℃~25℃), electrocatalysis for 12 hours can reduce the initial concentration of 0.80mg / m 3 The formaldehyde content was reduced to 0.07mg / m 3 , reaching the internationally prescribed safety concentration range.
7. The use of the composite membrane material electrocatalyst according to claim 1 at room temperature, characterized in that: The catalyst does not need to be activated and can be used continuously, thereby solving the environmental pollution problem of building decoration materials that continuously release formaldehyde.