209 results about "Catalytic membrane" patented technology

The invention relates to the technical field of industrial wastewater deep purification, and discloses an industrial wastewater deep purification system based on nano catalytic membrane separation, which comprises a pretreatment module, a catalytic degradation module, a membrane separation module, an intelligent control module and a regeneration maintenance module which are sequentially connected according to a treatment flow, the pretreatment module adjusts the water quality of inlet water to a range suitable for subsequent treatment through pH adjustment and suspended matter interception, that is, the pH is 2-11, and the turbidity is less than or equal to 50NTU; the catalytic degradation module is used for decomposing organic pollutants and mineralizing refractory substances under the excitation of ultraviolet / visible light by utilizing the photocatalytic characteristic of a nano catalytic membrane. The TiO2 / WO3 heterojunction nano catalytic membrane is adopted, so that deep oxidation of refractory pollutants such as phenol and sulfonamide antibiotics is realized, finally, the COD removal rate of 98.7% is achieved, and compared with a traditional photocatalytic process, the energy consumption is reduced by 54%.

The invention discloses a method for producing formic acid by reducing carbon dioxide through a hydrogen-driven hollow fiber catalytic membrane reactor, and relates to the technical field of carbon dioxide resource utilization. In order to solve the problems of low formic acid product selectivity, low CO2 conversion efficiency and high cost in the prior art, hydrogen is used as the only energy source, and a hollow fiber non-porous membrane is utilized to realize bubble-free efficient mass transfer of H2 to form a compact hydrogen-rich layer on the surface; the nano-metal particle catalyst loaded on the surface of the membrane synergistically activates hydrogen at a gas-liquid-solid three-phase interface to generate active hydrogen atoms, and CO2 transferred in a dissolved state or a gas phase is subjected to directional catalytic reduction to form formic acid with high selectivity. The method is operated at normal temperature and normal pressure, so that the H2 utilization efficiency and the CO2 mass transfer efficiency are remarkably improved, and the byproduct separation cost and the operation energy consumption are effectively reduced; the produced formic acid can be used as an important chemical raw material and intermediate, an excellent liquid hydrogen storage carrier, a formic acid fuel cell fuel and a microbial carbon source, and has wide application value.

The invention discloses a preparation method of a catalytic membrane for organic wastewater treatment, which comprises the following steps: dissolving polyvinylidene fluoride (PVDF), a pore-forming agent and plant polyphenol in an organic solvent, and stirring to obtain a membrane casting solution, wherein the PVDF accounts for 12-20%, the pore-forming agent accounts for 1-8%, and the plant polyphenol accounts for 1-6%; standing and defoaming the membrane casting solution, blade-coating the membrane casting solution on a support body to form a membrane, and performing phase inversion in a water bath to obtain the plant polyphenol modified PVDF membrane; and immersing the membrane in a 3-10 mmol / L metal chloride aqueous solution, and reacting at 40-80 DEG C for 6-48 hours, so that metal ions and polyphenol are coordinated and crosslinked, and a metal-polyphenol network layer is formed on the surface of the membrane and the inner walls of membrane pores, thereby obtaining the catalytic membrane. The catalytic membrane can activate peroxymonosulfate (PMS) and synergistically degrade organic pollutants in water under a differential pressure filtration working condition, active sites are anchored stably, metal precipitation is reduced, and flux and catalytic efficiency are both considered.

This invention discloses an electrically controlled enrichment catalytic membrane, its preparation method, and its application in water treatment, belonging to the field of environmental organic pollution remediation technology. The electrically controlled enrichment catalytic membrane comprises a substrate layer and a copolymer coating layer with reversible electro-oxidation-reduction properties. The substrate layer is a titanium suboxide conductive ceramic membrane with a pore size of less than 1 micrometer, and the copolymer coating layer is an organic blend polymer TMA containing nitro radical functional groups. x -co-TMPMA (1‑x) Where x% represents the degree of oxidation. This invention also provides an application of the above-mentioned electrically controlled enrichment catalytic membrane in water treatment for the removal of organic pollutants. The electrically controlled enrichment catalytic membrane is used as a filter membrane in an electrochemical water treatment device. Two filter membranes are connected to the two poles of an AC power system, with the positive and negative poles reversing during a cycle. The polluted solution is controlled to flow sequentially through the two filter membranes. By adjusting the positive and negative bias parameters on the filter membranes, hydrophobic organic pollutants in the polluted solution are adsorbed and oxidized for removal. This method is energy-saving, environmentally friendly, and easy to operate.

The invention belongs to the technical field of advanced oxidation and membrane separation, and particularly relates to a PES / CP / CoCo-PBA composite catalytic membrane and a preparation method and application thereof.The PES / CP / CoCo-PBA composite catalytic membrane comprises a PES basement membrane and a catalytic activity layer combined on the PES basement membrane in situ through a phase inversion method, the catalytic activity layer is made of a CP / CoCo-PBA composite material, and the preparation method of the composite catalytic membrane comprises the steps that the PES basement membrane and the catalytic activity layer are combined in situ through a phase inversion method; the CP / CoCo-PBA composite material is formed by enabling catalytic particles CoCo-PBA to grow on a carbon material in situ through a hydrothermal method. The PES / CP / CoCo-PBA composite catalytic membrane provided by the invention has excellent catalytic degradation performance and good stability, not only has conductivity to realize the effect of electrochemically activating PMS, but also can keep higher mechanical strength and pollution resistance to meet the requirements of long-term operation and large-scale industrial application.

The invention relates to the technical field of composite materials, in particular to a graphite carbon nitride catalytic membrane material and a preparation method and application thereof. The preparation method comprises the following steps: mixing melamine, a halogen source and water, drying, and carrying out heat treatment to obtain the halogen intercalation carbon nitride composite material; mixing the halogen intercalation carbon nitride composite material dispersion liquid with a metal salt solution, then adjusting the pH value to be alkaline, carrying out an in-situ coprecipitation reaction to obtain a metal oxide / halogen intercalation carbon nitride heterojunction, and carrying out vacuum calcination on the metal oxide / halogen intercalation carbon nitride heterojunction to obtain metal oxide / halogen intercalation carbon nitride heterojunction composite powder; mixing the metal oxide / halogen intercalation carbon nitride heterojunction composite powder, a polymer carrier and N, N-dimethylformamide to obtain a spinning solution, and performing electrostatic spinning to obtain a nascent fiber membrane; and calcining the nascent fiber membrane to obtain the graphite carbon nitride catalytic membrane material. The preparation method is high in operability, and the prepared material has the characteristics of stable structure and high catalytic efficiency.

The invention relates to the technical field of catalytic membrane materials, and discloses a recyclable piezoelectric photocatalytic membrane material for uranium extraction and a preparation method and application thereof.The preparation method comprises the steps that S1, nanosheets are prepared, specifically, urea is prepared into the nanosheets, then the nanosheets and KSCN powder are ground and heated, and after cooling, washing is conducted to obtain cyanated C3N4 nanosheets; and S2, preparing a composite fiber membrane, namely ultrasonically dispersing cyanated C3N4 nanosheets with different masses in DMF (Dimethyl Formamide), then adding PVDF (Polyvinylidene Fluoride) and PVP (Polyvinyl Pyrrolidone), stirring to prepare a spinning solution, sucking and fixing the spinning solution on an electrostatic spinning device by using an injector, and spinning to prepare the composite fiber membrane doped with cyanated C3N4 with different proportions. The required recyclable piezoelectric photocatalytic membrane material prepared by spinning is high in uranium extraction efficiency and has a good antibacterial effect and an excellent application prospect, and in preparation of a catalytic material, a piezoelectric-photocatalytic technology is combined with a recyclable technology and antibacterial performance, so that the performance of the catalytic material is comprehensively improved.

The invention discloses a preparation method of an inorganic piezoelectric catalytic membrane and application of the inorganic piezoelectric catalytic membrane in water treatment by coupling an advanced oxidation technology, and belongs to the technical field of environmental functional materials and water treatment. Technical breakthrough is achieved through a synergistic mechanism of an inorganic piezoelectric material and an advanced oxidation technology, the inorganic piezoelectric catalytic membrane is prepared by taking the piezoelectric material as a core piezoelectric component through ball-milling mixing, dry-pressing forming and high-temperature calcination processes, a multi-stage pore channel structure (the pore diameter is 50-100 nm) is formed, and a piezoelectric electric field larger than or equal to 0.5 V is generated under dynamic mechanical energy; the electric field is used for directionally activating the oxidant to generate high-selectivity singlet oxygen (1O2) by adjusting an electron structure on the surface of the catalyst, and the selectivity of the singlet oxygen reaches 95% or above; the mass transfer efficiency is remarkably improved through the synergistic effect of the membrane confinement effect and the piezoelectric micro-current, efficient removal of refractory pollutants such as sulfamethoxazole and bisphenol A is achieved (the degradation rate within 30 minutes is larger than or equal to 99%), and the self-cleaning function is achieved (the flux recovery rate is larger than or equal to 98%).

The application discloses a method for activating persulfate for improving the degradation performance of organic pollutants based on a flow-through electrocatalytic membrane, which comprises two steps of preparing a boron nitride electrocatalytic membrane loaded with bimetallic nanoparticles and carrying out a flow-through degradation reaction. Compared with a traditional mode, the flow-through mode provided by the application realizes effective coupling of a membrane catalytic system and a conventional electro-activated persulfate system, breaks through the limitation of low mass transfer efficiency, significantly improves the utilization rate of persulfate, and thus improves the degradation efficiency of organic pollutants. The flow-through reactor provided by the application has the advantages of simple structure, strong operability, low catalyst loss and good stability, has a wide industrial application prospect, and provides an efficient, economical and sustainable solution for the degradation of organic pollutants.

The application provides a method for treating fluorine-containing quinolone antibiotic wastewater by using an electrochemical membrane reactor, and belongs to the technical field of antibiotic wastewater treatment. The fluorine-containing quinolone antibiotic wastewater is introduced into the electrochemical membrane reactor for electrolysis treatment, wherein the electrochemical membrane reactor has an anode membrane and a cathode membrane, and the anode membrane is a titanium-based electrocatalytic membrane loaded with an electrocatalyst. The specific surface area of the anode membrane can be effectively increased by doping boron elements, the stability of the electrode membrane is improved, and then the electrocatalytic activity of the anode membrane is improved, and the degradation rate reaches 100% after electrolysis for 1h.

A printed ceramic catalyst support for a catalytic membrane and method of forming the same. The support includes a plurality of printed ceramic layers, wherein each printed ceramic layer includes a hexagonal grid having a plurality of hexagonal openings, and wherein adjacent printed ceramic layers are offset from each other such that the hexagonal openings of adjacent printed ceramic layers are misaligned; and a plurality of printed ceramic posts that connect adjacent printed ceramic layers.

This invention discloses a method for preparing a porous layered catalytic membrane and its application, belonging to the field of wastewater treatment technology. Using MgCl2 as an etchant, this invention achieves mild control over the crystal structure by regulating the etching time and concentration of two-dimensional CoCo PBAs nanosheets in MgCl2 solution. This method successfully forms an in-plane porous structure while maintaining the original aspect ratio and crystal integrity of the two-dimensional nanosheets. The resulting two-dimensional nanosheets further self-assemble to form a porous layered catalytic membrane, constructing a dual mass transfer channel that works synergistically between interlayers and in-plane. During dynamic operation, the membrane flux is approximately 1.5 times higher than that of the unpored sample, and pollutant degradation maintains a consistently high rate. This method has advantages such as mild reaction conditions, good structure preservation, simple process, and high reproducibility, effectively solving the problems of structural damage and difficulties in large-scale preparation in existing etching technologies.

The invention belongs to the technical field of environmental pollution treatment and water treatment, and particularly relates to a method for degrading organic pollutants by coupling a nano confinement catalytic membrane with micro-nano bubbles. The method comprises the following steps: adding micro-nano bubble water and an oxidizing agent into an organic pollutant solution, regulating the pH value to prepare a pretreatment mixed solution, and enabling the pretreatment mixed solution to pass through a nano confinement catalytic membrane to catalytically degrade the organic pollutants, the nano confinement catalytic membrane comprises an organic polymer membrane substrate and a catalyst loaded in the organic polymer membrane substrate; the loading capacity of the catalyst is 5 to 30 mg. The problems that antibiotics are difficult to degrade, pollutant concentration is easily caused by membrane separation, a catalyst is difficult to recycle, and membrane flux and catalytic activity are difficult to balance are solved, the method has the advantages of being high in degradation efficiency, stable in membrane flux, easy to recycle the catalyst and wide in application range, and wastewater containing organic pollutants can be efficiently treated.

Disclosed is a method of dehydrogenation of hydrogen-containing compounds in a reactor comprising a catalytic chamber, an electrochemical chamber, and an H-conductive membrane, comprising dehydrogenating the hydrogen-containing compound to produce hydrogen atom equivalents and oxidizing the hydrogen atom equivalents on the anodic H-conductive membrane. The reaction between the protons and a molten electrolyte in the electrochemical chamber generates water, which is decomposed on a counter electrode producing hydrogen. The hydrogen can be used in hydrogenation reactions. Also disclosed is a method of reducing a substrate, for example, a substrate dissolved or dispersed in the molten electrolyte.

The present invention relates to an enhanced catalytic nickel oxide sheet having an organic part which includes non-stoichiometric nickel oxides dispersed in an organic matrix, wherein the catalytic sheet is supported on a substrate. The invention also relates to a method for obtaining the catalytic film and to its uses as an electrode in electrocatalysis of water or in photocatalysis.

The column type catalytic membrane component comprises a shell, a membrane core is inserted into the shell, a catalyst is arranged in the membrane core, an end cover is arranged on the right side face of the shell through a fixing bolt, a supporting seat is arranged in an inner cavity of the shell, the left end of the membrane core is inserted into the supporting seat, and a water return cavity and a water production cavity are formed in the supporting seat. The water return cavity is communicated with the interior of the membrane core, the water production cavity is communicated with an inner cavity of the shell, a return water outlet pipe and a water production outlet pipe are arranged on the left side face of the shell, the return water outlet pipe is inserted into the return water cavity, and the water production outlet pipe is inserted into the water production cavity; the produced water inlet pipe and the backwater inlet pipe are both communicated with the inner cavity of the membrane core; the produced water inlet pipe, the backwater inlet pipe, the backwater outlet pipe and the produced water outlet pipe are all provided with dosing ports; the device has the advantages of small size and high treatment efficiency.

The invention discloses a method for removing trace or trace N-nitrosodimethylamine in water by using a self-assembled metal coordination polymer catalytic membrane. The self-assembled metal coordination polymer catalytic membrane material is added into a reaction flask of an N-nitrosodimethylamine solution subjected to nitrogen deoxidation treatment, the amount of loaded zero-valent iron is 25.7 mg / g to 171.4 mg / g, and the initial concentration of N-nitrosodimethylamine is 47.4 mu g / L to 196.5 mu g / L. The reaction bottle is sealed and then placed on a multi-point intelligent magnetic stirrer for magnetic stirring reaction, the rotating speed is 200 rpm, the temperature is 25 DEG C, the pH is 2.5-9.5, and stirring is conducted for 1.5 h. A carboxylated high-molecular polyacrylonitrile membrane is used as a base material, poly (diallyldimethylammonium chloride) polycation and polyacrylic acid polyanion electrolyte are assembled on the surface of the base membrane by adopting an electrostatic self-assembly technology, and the high-molecular self-assembled composite membrane with a large number of carboxyl groups is prepared. And preparing the self-assembled metal coordination polymer catalytic membrane through a metal-polycation electrolyte coordination technology and a classical liquid phase reduction method. The content of iron in the self-assembly metal coordination polymer catalytic membrane and the thickness of a surface functional layer are conveniently and effectively regulated and controlled by controlling the number of assembly layers, the concentration of iron ions in coordination reaction, the pH value of the solution and the like, high activity and stability are kept, and the method has the advantages of being simple in preparation process, low in cost, high in removal rate and the like.

The present disclosure provides a preparation method of an efficient and stable catalytic membrane based on a multi-scale hollow molecular sieve fiber, and belongs to the technical field of molecular sieve preparation. The preparation method includes the following steps: mixing a silicon source, an aluminum source, water, and an organic template, and stirring; heating, and adding deionized water; conducting a reaction by hydrothermal synthesis; conducting centrifugation on an obtained suspension, loading by mixing an obtained powder free of a mother liquor with an iron source, and washing and drying; dissolving a treated powder in anhydrous ethanol and conducting an ultrasonic treatment; adding a surfactant to an obtained dispersion, stirring, and conducting the ultrasonic treatment; and conducting coaxial electrospinning and calcination in sequence to obtain the membrane based on a hollow molecular sieve fiber.

This invention provides an easily recyclable, floating cyano-modified carbon nitride catalytic reactor for the natural photodegradation of polluted water bodies from dyeing and printing industries, along with its preparation method and application, belonging to the field of photocatalytic water treatment. Addressing the problems of difficult recovery and low carrier separation efficiency of traditional powder photocatalysts, this invention provides a carbon nitride photocatalytic material co-modified with cyano and sodium ions. This material is loaded onto graphite felt to form a photocatalytic film, which is then wrapped and fixed by an anti-floating mesh to constitute a floating catalytic reactor. The strong electron-withdrawing effect of cyano groups and the intercalation coordination effect of sodium ions synergistically promote the separation and migration of photogenerated carriers. This reactor is self-floating and easily recyclable, and can efficiently degrade organic dye pollutants in dyeing and printing water bodies under natural light, making it suitable for the remediation of static or slow-flowing water bodies such as rivers in dyeing and printing industrial parks. This invention features a stable structure, easy recovery, and modular deployment, providing a feasible solution for the transformation of photocatalytic technology into practical dyeing and printing water treatment projects.

This invention relates to a method for preparing a molecular sieve-type SCR catalytic membrane. The method utilizes an α-Al₂O₃ ceramic membrane tube as a carrier. The ceramic membrane tube is subjected to alkaline washing and acid washing, followed by drying to remove impurities. Simultaneously, a membrane-forming solution is prepared. First, a molecular sieve is mixed with a metal compound exhibiting SCR efficiency. Deionized water is added to prepare a mixture with a catalytic metal content of 0.1-0.3 mol / L, and the pH is adjusted. An ion exchange reaction is then carried out by heating and ultrasonication. A binder is added to prepare the membrane-forming solution. The molecular sieve catalyst is loaded onto the inner side of the α-Al₂O₃ ceramic membrane tube using an impregnation coating method. Next, the membrane tube is dried and calcined. The outer surface of the ceramic membrane tube is then modified to be hydrophobic, thus obtaining the molecular sieve SCR catalytic membrane. This invention achieves a highly efficient molecular sieve SCR catalytic membrane through a single calcination process, simultaneously realizing waste gas dewatering and dust removal as well as SCR catalysis, and reducing NO emissions at low temperatures. x It has a high conversion rate, and the whole process is safe and environmentally friendly.

This invention provides an Ag-doped photocatalytic composite membrane, its preparation method, and its application, relating to the field of water treatment membrane technology. The Ag-doped photocatalytic composite membrane of this invention has a composite functional structure consisting of a polyester nonwoven fabric support layer, a PVDF base membrane core layer, an Ag-BaTiO3 / ZnIn2S4 piezoelectric-photocatalytic functional layer, and a polydopamine hydrophilic protective layer, arranged sequentially. By constructing an Ag-doped dual piezoelectric coupled heterojunction system, introducing the surface plasmon resonance effect of Ag ions, and combining plasma-assisted deposition technology with the composite functional structure, this invention achieves a wide spectral response (UV to near-infrared), highly efficient piezoelectric-photocatalytic synergistic degradation, robust catalyst adhesion to prevent detachment, and multiple effects of "separation-degradation-self-cleaning." This solves the problems of traditional piezoelectric-photocatalytic membranes in terms of catalytic efficiency, long-term stability, and industrial adaptability, and has good application prospects.

The invention belongs to the technical field of membrane separation, and provides a nano confinement catalytic membrane as well as a preparation method and application thereof. The preparation method of the nano confinement catalytic membrane comprises the following steps: immersing a porous ceramic substrate membrane into a first mixed solution for seed crystal induction; and placing in a second mixed solution for secondary growth, and finally calcining to obtain the nano confinement catalytic membrane with graded pores and a monatomic cobalt site as a catalytic activity center. The nano confinement catalytic membrane provided by the invention has a hierarchical pore structure, can effectively purify wastewater when being used for treating organic pollutant wastewater, and shows high water flux at the same time.

The invention discloses a multi-stage plate-type electro-catalytic membrane reactor for degrading organic matters in reverse osmosis concentrated water of coking wastewater and application of the multi-stage plate-type electro-catalytic membrane reactor. The multi-stage plate-type electro-catalytic membrane reactor is internally provided with a chamber for electrochemical reaction, and consists of a plurality of cathode chambers and anode chambers which are the same in number and are uniformly alternated, a conductive contact pin, a water inlet end and a water outlet end, the distance between every two cavities is 10 mm, the multiple cathode chambers and the multiple anode chambers which are the same in number and are evenly and alternately arranged are detachable plate faces, operation is convenient, and environment friendliness is achieved. The multi-stage plate-type electro-catalytic membrane reactor is simple in design, wastewater runs in the reactor in a circulation mode, mass transfer can be improved, the electrochemical active surface area can be increased, the current utilization efficiency can be improved through a parallel power connection mode, and the service life of the reactor is prolonged. The device has the advantages of high organic matter removal efficiency, convenience in actual operation, automatic management, good stability, low operation energy consumption, reusability and the like, and has research significance in the field of electrochemical water treatment.

The invention relates to an electro-catalysis assembly for recycling grey water and a water treatment system, and belongs to the technical field of grey water treatment, the electro-catalysis assembly comprises a membrane cylinder, a water guide net pipe, an electro-catalysis membrane and an anode bar, a water inlet end cover is fixed at a water inlet port of the membrane cylinder, a water outlet end cover is fixed at a water outlet port of the membrane cylinder, a water inlet and an anode hole are formed in the water inlet end cover, and a water outlet hole is formed in the water outlet end cover; the closed end of the water guide net pipe is fixed on the water inlet end cover, and the other open end of the water guide net pipe is fixed and communicated with the water outlet hole; the electro-catalysis membrane is wrapped and fixed on the outer side pipe wall of the water guide net pipe; and one end of the anode bar penetrates through the anode hole, extends into the membrane cylinder and is electrically connected with the electro-catalysis membrane through grey water in the membrane cylinder. According to the invention, the electro-catalytic membrane is wrapped and fixed outside the water guide net pipe, and when grey water flows in from the water inlet of the water inlet end cover, the grey water can flow out from the water outlet of the water outlet end cover through the filtration of the electro-catalytic membrane and the guidance of the pipe holes of the water guide net pipe, so that organic matters can be effectively removed, microorganisms can be effectively killed, the membrane pollution can be delayed, and the service life of the membrane can be prolonged.

The invention provides a bimetallic nanofiber catalytic membrane and a preparation method and application thereof, and the preparation method of the bimetallic nanofiber catalytic membrane comprises the following steps: 1) preparing a base membrane containing cobalt element; 2) sequentially soaking in a solution A containing 2-methylimidazole for first reaction; soaking in a solution B for second reaction, wherein the solution B is formed by adding a second cobalt source into the solution A; soaking in a solution C containing a manganese source for third reaction; and (3) carrying out high-temperature carbonization, so as to finally prepare the bimetallic nanofiber catalytic membrane. According to the prepared bimetallic nanofiber catalytic membrane, through the synergistic effect of Co and Mn, the catalytic degradation performance of the catalytic membrane is effectively improved, and when the bimetallic nanofiber catalytic membrane is applied to degradation of organic pollutants in a water body, the catalytic performance is good, stability is good, the service life is long, and various organic pollutants in the water body can be degraded.

This invention discloses a carbon nanotube / ZIF-67 derived Co-C / CNT catalytic membrane, its preparation method, and its application. The method involves acidifying carbon nanotubes to immobilize the growth of ZIF-67 on the carbon nanotubes. ZIF-67 serves as the Co source. The carbon nanotube / ZIF-67 composite material is first acidified, then ground with a eutectic mixture, and finally carbonized. This effectively inhibits the aggregation of Co elements in ZIF-67 during pyrolysis, achieving high dispersion of metal active sites while preventing metal ion leaching. This improves the catalytic activity of the Co-C / CNT catalytic membrane, achieving highly efficient PMS activation, effectively inhibiting the loss of Co active components, and preventing Co degradation. 2+ The problem of secondary heavy metal pollution caused by leaching.

The invention belongs to the technical field of electro-catalysis membrane electrode reactors, and relates to a membrane electrode reactor based on an electro-catalysis double-electric-layer interface water structure reconstruction strategy. The invention discloses a membrane electrode reactor based on an electrocatalytic double-electrode-layer interface water structure reconstruction strategy. The membrane electrode reactor comprises a cathode electrode, an anode electrode and a diaphragm, the cathode electrode is a platinum-based electrode loaded with a single hexagonal boron nitride layer, and the anode electrode is a NiFe-LDH electrode; when external voltage is applied to the membrane electrode reactor for electrocatalytic reaction, an interface water structure is reconstructed, and the current density of the membrane electrode reactor is improved. The invention also discloses an application of the membrane electrode reactor in interface water structure reconstruction.

The invention discloses a preparation method and application of a porous layered catalytic membrane, and belongs to the technical field of wastewater treatment. According to the method, MgCl2 is used as an etching agent, and mild regulation and control of a crystal structure are realized by regulating and controlling the etching time and concentration of the two-dimensional CoCo PBAs nanosheet in a MgCl2 solution. According to the method, the hole structure can be successfully formed in the plane on the premise of keeping the original width-to-thickness ratio and crystal integrity of the two-dimensional nanosheet. The obtained two-dimensional nanosheets are further self-assembled to form a porous layered catalytic membrane, and interlayer and in-plane synergistic double mass transfer channels are constructed. In the dynamic operation process, the flux of the membrane is improved by about 1.5 times compared with that of a non-perforated sample, and the pollutant degradation is always kept at a relatively high rate. The method has the advantages of mild reaction conditions, good structure retentivity, simple and convenient process, high repeatability and the like, and effectively solves the problems of structural damage and difficulty in large-scale preparation in the existing etching technology.

The invention discloses a catalytic membrane capable of repeatedly self-growing an active layer. A flaky solid of a layered double hydroxide micro / nano active layer is self-grown in situ on a geopolymer inorganic membrane; the invention also discloses a preparation method and application of the catalytic membrane. According to the catalytic membrane, the layered double hydroxide active layer with the micro / nano structure is subjected to in-situ hydro-thermal synthesis, the multifunctional catalytic membrane with the repeatable self-growing active layer is obtained, the repeatable and self-growing active layer can be achieved for multiple times, and micro / nano particles are not prone to falling off from a carrier in the using process.

The application relates to the technical field of fuel cells, and discloses a fuel cell membrane electrode assembly and a proton exchange membrane fuel cell, wherein an auxiliary frame is arranged at the butt joint of a main polyester frame of the fuel cell membrane electrode assembly and a gas diffusion layer, and the auxiliary frame is connected with a catalytic membrane electrode. The proton exchange membrane fuel cell comprises the above-mentioned membrane electrode assembly. The fuel cell membrane electrode assembly and the proton exchange membrane fuel cell can effectively resist differential pressure stress, dry-wet cycle stress and mechanical puncture risk, and significantly improve the durability and reliability of the membrane electrode assembly.