144 results about "Catalytic membrane" patented technology

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.

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.

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 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 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 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.

The application provides a core-shell structure composite adsorbent, a preparation method and application thereof; the core-shell structure composite adsorbent is prepared by adopting a one-step co-precipitation-thermal immersion process to prepare a core-shell structure from ZIF-8 and UiO-66-NH2, and then performing sulfonation modification, dispersing in a polyvinyl alcohol solution, drying and performing thermal solidification to complete coating; the preparation process is environment-friendly and efficient, and can realize gradient capture of aldehydes, ketones, carboxylic acid esters, aromatic hydrocarbons and metal ions. When the core-shell structure composite adsorbent is regenerated, a low-pressure steam and hydrogen / nitrogen mixed gas blowing combination mode is adopted, and the adsorption capacity attenuation is small after multiple cycles, the defects that the existing single MOF material or adsorption technology cannot simultaneously remove polar, non-polar impurities and metal ions are solved, the application limitations of the existing catalytic membrane or single coating technology are avoided, and the core-shell structure composite adsorbent has a good industrial application prospect.

Methods and systems or devices for synthesis of valuable chemicals from carbon dioxide and hydrogen are provided. A high surface area hollow fiber catalytic membrane reactor such as with hollow fibers coated with a water permeable membrane material is used. The reactor also contains methanol synthesis component, and as needed, a dehydration catalyst component such that the two-step reaction takes place on the catalyst surface. Produced water permeates through the membrane, exiting the reactor immediately after it is formed. Unreacted reactants and products flow to the reactor exit. The valuable chemicals can be liquefied petroleum gas (LPG), dimethyl either (DME), methanol, ethanol, olefin, jet fuel or a combination thereof.

The invention discloses an iron / graphene oxide composite membrane for stable and complete dehalogenation, a preparation method of the iron / graphene oxide composite membrane and application of the iron / graphene oxide composite membrane in a self-circulation reduction system, and belongs to the field of catalytic membrane technologies and water treatment materials. According to the composite membrane, superfine zero-valent iron nanoparticles are uniformly loaded on a graphene oxide sheet layer through an in-situ growth method, and a ferrous iron-ferric iron-reduced graphene oxide cyclic catalytic system is constructed by utilizing a nano confinement effect in the membrane. The ferrous iron activates the sulfite to generate sulfite free radicals and ferric iron, and meanwhile, the ferric iron is reduced and regenerated into the ferrous iron by electrons provided by the reduced graphene oxide, so that a self-sustaining self-circulation catalytic system is formed. The system can realize efficient, rapid and stable degradation and complete dehalogenation of halogenated organic pollutants in a water body. The preparation process is simple, the material stability is high, the catalytic efficiency is remarkable, and the good practical application prospect is achieved.

The invention belongs to the technical field of separation membrane materials, and relates to a preparation method and application of a one-step bionic beetle catalytic membrane, and the preparation method comprises the following steps: directly dispersing a hydrophilic nano-catalyst in a trifluoroacetic acid membrane casting solution of PET, and carrying out one-step molding through a non-solvent induced phase separation technology. In the phase inversion process, the catalyst spontaneously segregates and is anchored on the surface of the membrane and in pore channels to form a'hydrophilic bulge-hydrophobic substrate 'heterogeneous wetting structure simulating the backs of desert beetles, so that one-step in-situ integration of a membrane matrix, bionic morphology and a catalytic function is realized. The prepared membrane has excellent oil-water separation performance and catalytic degradation capability, the water-in-oil emulsion separation efficiency is greater than 99.5%, and organic pollutants can be rapidly degraded in the presence of hydrogen peroxide. The invention has the advantages of simple and efficient process, low cost and stable structure, and is suitable for advanced treatment and synchronous purification of complex oily wastewater.

This invention relates to a catalytic membrane for HCl oxidation reaction, the preparation method of which includes: Step 1: reacting silica particles with SiO2. ­2 A mixture of ZrO2 sol and silica gel is coated onto a hollow fiber carrier and calcined to obtain a transition layer for the membrane. Step two: A silsesquioxane sol is applied to the transition layer obtained in step one and calcined to obtain a silica membrane. Step three: The silica membrane obtained in step two is subjected to impurity removal treatment. Step four: A solution of silane coupling agent (A) and a metal salt solution (B) are prepared separately and mixed to obtain solution C. The silica membrane treated in step three is immersed in solution C and grafted with nano-metal particles using ultrasonic assistance, followed by a high-temperature reaction to obtain a catalytic membrane. The catalytic membrane designed in this invention, when applied to the HCl oxidation reaction, can separate reactants and products simultaneously, causing the reaction to shift forward, increasing the reaction conversion rate, reducing the reaction temperature, and extending the catalyst lifetime.

The application relates to a cathode catalytic membrane and a preparation method thereof, a membrane electrode and a fuel cell. The cathode catalytic membrane comprises a first catalytic layer, a second catalytic layer and a third catalytic layer which are stacked in sequence, the components of the first catalytic layer, the second catalytic layer and the third catalytic layer all comprise ion polymers and carbon-supported catalysts, and all have porous structures; the carbon-supported catalysts comprise carbon carriers and catalysts supported on the carbon carriers; the mass ratio of the ion polymer to the carbon carrier in the first catalytic layer is > the mass ratio of the ion polymer to the carbon carrier in the second catalytic layer > the mass ratio of the ion polymer to the carbon carrier in the third catalytic layer; the average pore diameter of the porous structure in the first catalytic layer and the third catalytic layer is larger than the average pore diameter of the porous structure in the second catalytic layer. The catalytic membrane can improve the activity of the membrane electrode, and further improve the efficiency of the fuel cell.

The application discloses in-situ growth coated catalytic proppant and a preparation method and application thereof, and the preparation method of the proppant comprises the following steps: dispersing a proppant matrix in a salt solution containing one or more transition metal precursors to form a solid-liquid suspension system; adding a precipitator to the suspension system to induce in-situ heterogeneous nucleation and growth of the metal precursors on the surface of the proppant matrix, thereby forming a precursor-coated proppant with a core-shell structure; and performing high-temperature calcination on the precursor-coated proppant to obtain the in-situ growth coated catalytic proppant. The application utilizes in-situ growth and high-temperature reactivity sintering technology to construct a firm high-entropy ceramic catalytic film on the surface of the proppant, thereby solving the problems that a traditional impregnated proppant coating is easy to fall off and has poor temperature resistance; meanwhile, the high-entropy effect and lattice oxygen vacancies are utilized to achieve a technical breakthrough that the proppant can efficiently catalyze thick oil viscosity reduction without an organic modifier.

The vibration catalytic water treatment device comprises a peristaltic pump, an analysis pump, a rotational flow mixer and spindle-shaped reaction cavities, the peristaltic pump and the analysis pump are both communicated with the rotational flow mixer, and the multiple sets of spindle-shaped reaction cavities are communicated in series end to end through circular flanges to form a Venturi tube structure; the cyclone mixer is communicated with an inlet of the spindle-shaped reaction cavity, a rotating sleeve is vertically and rotatably mounted at a middle wide opening in the spindle-shaped reaction cavity, a plurality of groups of composite flexible catalytic membrane assemblies are fixedly mounted in the middle of the rotating sleeve, and an injection pump is arranged on one side, close to the cyclone mixer, of the spindle-shaped reaction cavity; and two groups of ultrasonic vibrators are fixedly mounted on the outer sides of narrow openings on the two sides of each group of spindle-shaped reaction cavities. The device has the advantages that the device is integrated with a coupled structure, integrates the effects of hydrodynamic cavitation, ultrasonic cavitation, sound-induced inverse piezoelectric catalysis, flow-induced positive piezoelectric catalysis, contact electrification catalysis, friction piezoelectric type nano generator and the like, and enhances the water treatment effect.

The invention discloses a porous catalyst based on a biomineralization template, a composite catalytic membrane and preparation and application thereof, and the porous catalyst is prepared by the following method: adding a metal chloride into a transition metal salt solution, then adding the biomineralization template, and stirring in a water bath for reaction; after the reaction is finished, performing suction filtration and drying, and grinding to obtain solid powder; wherein the biomineralization template is selected from one or two of waste pearls and shells; and fully calcining the solid powder in an air or nitrogen atmosphere, naturally cooling the solid powder to room temperature, and washing and drying the solid powder to obtain the porous catalyst based on the biomineralization template. According to the porous catalyst based on the biomineralization template, the magnesium oxide or zinc oxide loaded Co or Cu porous catalyst is synthesized through high-temperature conversion and washing of the biological template, and the performance efficiency of degrading organic pollutants can be improved. The method adopts simple dipping and calcining methods for preparation, and the process flow is short.

This invention belongs to the field of composite materials and wastewater treatment technology, and discloses a method for preparing a dual-effect catalytic membrane through swelling-induced retention and immobilization, and its application. The method first prepares a dual-effect catalyst, then uses organic reagents to induce membrane swelling, enlarging the membrane pores and fixing the dual-effect catalyst. Subsequently, the membrane is naturally dried overnight, achieving adhesive-free assembly and fixation of the membrane and catalyst. This invention can be applied to the removal of tetracycline from water through persulfate advanced oxidation and photocatalytic oxidation. This invention has advantages such as simple preparation process, inexpensive and readily available raw materials, easy separation and recovery of the product membrane, and green and efficient operation. The tetracycline degradation rate reaches 98.09% in 60 minutes using persulfate advanced oxidation technology, with up to 5 recycling cycles. Furthermore, within 60 minutes, photocatalytic oxidation of tetracycline degrades it to 82.60%. This solves the problems of difficult recovery, high risk of secondary pollution, and inability to remove organic pollutants using multiple catalytic methods associated with traditional powdered catalysts, providing broad industrial application prospects for the treatment of tetracycline-containing wastewater.

The invention discloses a preparation method of a photoelectric catalytic membrane, and belongs to the technical field of collaborative treatment and directional conversion of flue gas pollution and carbon reduction and wastewater denitrification. The Cu / Cu2O / CF / PTFE catalytic membrane is prepared by adopting wet chemical reduction and electrostatic spinning methods, and is used for coupling CO2 in flue gas and NO3 <-> in wastewater and producing high-added-value chemicals. The catalytic membrane has the advantages of high dust aerosol filtering efficiency, low gas resistance and the like. According to the preparation method, the catalyst is prevented from falling off in a blending electrostatic spinning mode, the conductivity of the fiber membrane is enhanced by the carbon nano tubes, the carbonized catalytic membrane has good conductivity, and meanwhile, the Cu / Cu2O catalyst nano particles forming a Schottky heterogeneous interface in situ can effectively improve the photo-generated charge separation efficiency and promote coupling of CO2 and NO3 <-> to form urea. Due to the characteristics, the prepared catalytic membrane can realize efficient interception of dust aerosol, and also has efficient and stable synthesis of urea.

The invention discloses a preparation method of a novel tubular Ti-NATA / SnO2-Sb electro-catalytic membrane added with a titanium dioxide nanotube array (TiO2-NATA) as a middle layer. The preparation method comprises the following steps: taking SnCl4H2O and SbCl3 as raw materials, carrying out alkali washing oil removal and oxalic acid etching, putting into an ethylene glycol solution containing 0.25 wt.% of NH4F and 2wt.% of H2O for positive polarization, then carrying out cathodization in a NaClO4 solution, carrying out high-temperature calcination to obtain an intermediate layer, then preparing an ethylene glycol, citric acid, SnCl4H2O and SbCl3 composite sol-gel solution, brushing the sol-gel solution loaded metal oxide catalyst layer by using a brush according to a certain weight, and finally preparing the SnCl4H2O / SbCl3 composite sol-gel catalyst layer. And drying in a drying oven, calcining in a muffle furnace, circulating to a certain weight, and calcining for 2 hours in the muffle furnace at the temperature of 500 DEG C to obtain the tubular Ti-NATA / SnO2-Sb electro-catalytic membrane. The TiO2 nanotube array intermediate layer has good conductivity, catalytic activity and large specific surface area, and can provide more active sites and improve the electrode activity when being used for modifying the electrode; and meanwhile, the service life of the electrode can be prolonged by introducing the TiO2 nanotube array intermediate layer.