249 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 relates to the technical field of catalysis, in particular to a green preparation process for synthesizing 4 '-chloro-2-aminobiphenyl through a membrane method.A palladium-based catalytic membrane is prepared through an impregnation method, by means of the multi-pore-channel advantage of a ceramic membrane, active components can be well distributed on the surface and in the membrane, contact of a reaction substrate and active sites is promoted, and the catalytic activity of 4'-chloro-2-aminobiphenyl is improved. The reaction effect is enhanced, the reaction efficiency is improved, the preparation process is simple, the preparation environment is mild, and large-scale production can be realized; meanwhile, the 4 '-chloro-2-aminobiphenyl is prepared by adopting a method for carrying out Suzuki-Miyaura coupling reaction by adopting the catalytic membrane, tedious steps in the traditional industry are omitted, compared with a traditional heterogeneous catalyst, the trouble of recovery is avoided, the cost is saved, the harm to the environment is greatly reduced, and compared with the prior art, the 4'-chloro-2-aminobiphenyl has a wide application prospect.

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 an efficient flocculation, ozone catalysis and membrane distillation combined process which is suitable for treating high-salinity wastewater, especially desulfurization wastewater of a coal-fired power plant and coal chemical wastewater. According to the technology, efficient flocculation, ozone catalysis and membrane distillation technologies are ingeniously fused, a specially-made chitosan-based flocculant is added in the flocculation stage, and suspended solids and heavy metal ions in wastewater are effectively removed by means of the excellent adsorption and flocculation efficiency of the specially-made chitosan-based flocculant; in the ozone catalysis stage, an ozone decomposition process is accelerated by adding a self-developed ternary composite catalyst, so that organic pollutants are deeply purified; in the membrane distillation stage, a self-made antifouling and moisture-resistant composite membrane is used for efficient desalination and concentration, and finally efficient purification and recycling of the high-salinity wastewater are achieved. The process can significantly improve the wastewater treatment effect, reduce the concentration of salt and harmful substances in the wastewater, also reduce the operation cost, and is suitable for large-scale industrial wastewater treatment.

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 discloses a preparation method and application of an open carbon nanotube composite film of two-dimensional graphene oxide intercalation one-dimensional packaged cobalt ferrite, and belongs to the technical field of preparation of two-dimensional material films. The invention aims to solve the problems that the catalytic effect of the existing catalytic membrane is easily interfered by natural organic matters and the selectivity on target pollutants is poor. The method comprises the following steps of: 1, preparing an open carbon nano tube for packaging cobalt ferrite; and 2, preparing the composite membrane by intercalating the two-dimensional graphene oxide. The method is used for removing organic pollutants in water. The preparation method is used for preparation and application of the open carbon nanotube composite film of the two-dimensional graphene oxide intercalation and one-dimensional packaging cobalt ferrite.

The invention discloses a preparation and use method of a silicon carbide catalytic membrane for treating refractory organic wastewater, and belongs to the technical field of wastewater treatment. The preparation method comprises the following steps: reacting a high-performance silicon carbide ceramic membrane prepared by taking silicon manganese slag and silicon carbide powder as raw materials with a hydrotalcite precursor, and calcining to form the hydrotalcite-loaded silicon carbide catalytic membrane. The preparation process is simple in technology and short in period, the high-performance silicon carbide ceramic membrane is obtained through optimization of a grain composition method, meanwhile, the hydrotalcite-loaded silicon carbide ceramic membrane has the characteristic of catalytic oxidation, ozone micro-nano bubbles are coupled, and refractory organic pollutants in water can be effectively removed.

The invention relates to a porphyrin iron-based biomimetic enzyme catalytic membrane for water treatment as well as preparation and application thereof, and belongs to the technical field of catalytic membranes. The porphyrin iron-based biomimetic enzyme catalytic membrane comprises a microfiltration membrane basement membrane and a porphyrin iron-based biomimetic enzyme catalyst loaded on the surface of the basement membrane in a chemical crosslinking mode, and the porphyrin iron-based biomimetic enzyme catalyst contains a catalytic activity center structure of 'Fe-N' coordination. The porphyrin iron-based biomimetic enzyme prepared by the invention is similar to a catalytic active center structure of natural peroxidase, has high affinity with hydrogen peroxide, and can greatly improve the utilization rate of hydrogen peroxide and the steady-state concentration of reactive oxygen free radicals; the constructed bionic enzyme-membrane reactor integrates dual functions of membrane separation and enzyme catalysis, realizes efficient combination of mass transfer and reaction, and greatly improves the removal performance of new pollutants in water.

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.

A supported carbon molecular sieve membrane having aluminum atomically distributed in it, wherein: the aluminum is present in an amount of equal to or lower than 15 wt. % of the carbon molecular sieve membrane; the membrane comprises a pore size distribution in which at least 70% of the pores have a pore size from 0.25 to 0.7 nm; and which is obtainable by dip-coating a support with a solution comprising a phenolic-resin and aluminum ions, followed by carbonization. The carbon content of the carbon molecular sieve membrane is from 75 wt. % to 95 wt. %, the oxygen content is from 2.5 wt. % to 8 wt. %, and the hydrogen content is from 1.5 wt. % to 6% wt. %. These CMSMs are useful for gas separation, H2 recovery from natural gas grids, H2 production from biomass, solvent dehydration, obtaining oxygen-enriched air, or dehydrogenation of methylcyclohexane, and as a catalytic membrane reactor or part of a catalytic membrane reactor.

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 invention discloses a ceramic catalytic membrane as well as a preparation method and application thereof in regeneration of a CO2-rich alcohol amine solution, the ceramic catalytic membrane comprises a ceramic membrane, and sulfated zirconium oxide is loaded on the surface of the ceramic membrane, in membrane pore channels and in a supporting layer. The preparation method of the ceramic catalytic membrane comprises the following steps: soaking a ceramic membrane in a zirconium sulfate solution, washing, drying and roasting. A membrane contactor constructed by using the prepared ceramic catalytic membrane can remarkably improve the regeneration performance of a CO2-rich alcohol amine solution, effective combination of the structure and the performance is realized, the preparation method is simple and convenient, the condition is mild, and the ceramic catalytic membrane with relatively high catalytic activity can be prepared at relatively low concentration.

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 invention belongs to the technical field of membrane catalysis, and relates to a method for reducing the Co particle size of a multi-channel Co / CM catalytic membrane. And coating the surface of the Co / CM catalytic membrane with a polydopamine coating, and then drying and calcining the Co / CM catalytic membrane. According to the method for reducing the particle size of Co in the Co / CM catalytic membrane, the particle size of Co can be effectively reduced, so that the active component Co in the catalytic membrane is re-dispersed, and the activity of the catalytic membrane in a p-nitrophenol catalytic hydrogenation reaction is obviously improved.

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 invention provides an electrically-enhanced Fenton-like water treatment method and device system.The electrically-enhanced Fenton-like water treatment device system comprises an electrically-enhanced Fenton-like catalytic membrane reaction unit, and the electrically-enhanced Fenton-like catalytic membrane reaction unit comprises a sealed insulating shell; the interior of the insulating shell is divided into a cathode part and an anode part by an insulating part, a water inlet is formed in the surface of the insulating shell of the cathode part, and a water outlet is formed in the surface of the insulating shell of the anode part; the cathode part is provided with a cathode, and the anode part is provided with an anode; the cathode is connected with the cathode of the direct-current power supply; the anode is connected with the positive pole of the direct-current power supply; and the material of the cathode comprises a CoFeP / CNTs (CoFeP / Carbon Nanotubes) catalytic membrane. Electrochemistry, a Fenton-like technology and a membrane technology are organically combined, so that the degradation efficiency is effectively improved; the long-term stable operation of the electric strengthening Fenton-like water treatment device system is realized.

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.