63results about How to "Promotes photocatalytic reactions" patented technology

The invention discloses a preparation method of BiVO4-BiOBr photocatalyst has a visible-light response, wherein the catalyst may be used under visible light, ultraviolet light, or sunlight. The preparation method of BiVO4-BiOBr photocatalyst that is in a multilevel nest-like nanostructure and is formed by nanosheets is: heating for 8 to 24 h under an alcohol-heating temperature of 100 to 200 DEG C with pH of 5 to 10. The catalyst of the invention can decompose water-soluble organic pollutant containing chlorine and sulfur, water-soluble organic pollutant of azo, xanthene, and anthraquinone type, and biological contaminant microcystic toxins generated by harmful algal bloom.

The invention discloses an iron-based metal organic framework (MOFs) photocatalytic material and its preparation method and use. The preparation method comprises dissolving FeCl3.6H2O and terephthalic acid in a DMF solution, carrying out a hydro-thermal reaction process under temperature programmed control and orderly carrying out alcohol washing, filtration and vacuum drying on the precipitated solids. The photocatalytic material has excellent adsorption and enrichment effects on volatile organic chemicals (VOCs), can efficiently degrade VOCs under visible light action and can be used in an air VOCs photocatalytic purification reaction system. The preparation method has the characteristics of simple processes, good environmental friendliness, mild reaction conditions, high catalytic efficiency and no secondary pollution and can be massively promoted in the field of environmental protection.

The invention relates to preparation of a composite photocatalyst, and particularly relates to a photocatalytic material which is formed by loading a P25 type nano TiO2/V2O5 composite on foamed nickel having large specific surface area and has high catalytic degradation performance. The preparation method comprises the following steps: dissolving ammonium metavanadate in water, performing wet milling together with P25, impregnating, loading onto the foamed nickel, drying, and calcining at 500 DEG C for 1 hour, thus obtaining the foamed nickel loaded V2O5/P25 photocatalytic material. According to the invention, the preparation method is simple; no expensive equipment is required; the raw materials are low in price; the mechanical performance is favorable; and the photocatalytic degradation rate and visible light response range of the prepared catalyst are greatly improved in comparison with P25. When the composite photocatalyst is used for degrading harmful gas such as formaldehyde and the like in rooms and automobiles, the problems that the powdery photocatalyst is difficult to recover and regenerate after use and the like can be avoided.

The invention belongs to the technical field of transportation facilities, and particularly relates to a functional road marking and a preparation method thereof. The functional road marking comprises, by weight, 10 to 20 parts of film-forming material, 1 to 10 parts of solvent, 1 to 10 parts of pigment, 30 to 60 parts of filler, 1 to 5 parts of additives, 1 to 5 parts of plasticizer and 1 to 10 parts of photocatalytic material; and the film-forming material is a solvent-based film-forming substance or a hot-melt type film-forming material. Compared with the prior art, the functional road marking and the preparation method thereof have the following advantages: 1) the material utilization rate is improved, and since the marking line is applied only to the road surface, it can fully contact with the light source, the utilization of photocatalytic materials can be improved; 2) materials can be conveniently replenished, when the material is used for a long time to make the material loss, the functional marking can be compensated at any time to avoid inconvenience in replenishing the nano-photocatalytic material loaded on the road.

The invention provides a novel rapid determining method of COD by photocatalytic digestion, which adopts a compound system combined by colored oxidant and nano-photocatalyst in acidic medium to carrying out illuminating oxidation digestion for water samples, and realizes the determination of COD by optically detecting the consumption of the colored oxidant, wherein the colored oxidant is of an oxidation substance which has absorption and good optical stability in an ultraviolet visible range, and the nano-photocatalyst is of a nano-size semi-conductor material which can absorb light energy and generate electron-hole pairs. In the process of photocatalytic digestion, the colored oxidant not only oxidizes reducing substances in water and receives photo-induced electrons, and the consumption of the colored oxidant corresponds to the amount of COD. The colored oxidant and the nano-photocatalyst are combined to generate extremely strong oxidation efficiency, and can oxidize a plurality of reducing substances, so that the oxidation digestion is quickly and efficiently carried out at room temperature under non-concentrated acid conditions. The invention can solve the problems that the existing determining method of COD has complicated process, time and energy consumption, requirement for high temperature and concentrated acid conditions, and can not realize rapid field determination.

The invention discloses a photo-catalytic air purifier of nanometer TiO2, which comprises the following parts: case, fan and purifying core, wherein the inlet and outlet are opened on the case; the purifying core is set in the case between inlet and outlet, which is cylinder-shaped porous ceramics with TiO2 in the ceramics; the fan is set in the inlet of case; the ultraviolet light source is set on the axial line of cylinder-shaped porous ceramics, which uniforms the ultraviolet strength. The invention avoids the generation of dead angle, which enlarges the touching area of air and nanometer TiO2 to strengthen the optical catalytic reaction.

The invention discloses a cellulose nanofibril aerogel loaded with a photocatalyst and a preparation method thereof. The preparation method comprises the steps of: (1) dissolving bismuth nitrate in a cellulose nanofibril suspension liquid, and mixing the substances evenly to obtain a mixed solution; (2) drying the mixed solution obtained in step (1) to obtain cellulose nanofibril aerogel loaded with bismuth ions; (3) dissolving a soluble bromide salt and a soluble chloride salt in deionized water, stirring the substances fully to obtain a halide salt solution; and (4) impregnating the cellulose nanofibril aerogel loaded with bismuth ions obtained in step (2) in the halide salt solution obtained in step (3), then taking the cellulose nanofibril aerogel out for drying, and conducting calcinations, thus obtaining the cellulose nanofibril aerogel loaded with the photocatalyst. The aerogel can achieve catalytic degradation of organic matters under visible light, also has high light utilization rate and good photocatalytic effect, and the nano-photocatalytic material is easy for recycling.

The invention discloses an interior wall coating having multiple functions of temperature and humidity regulation and photocatalysis and a preparation method thereof and belongs to the technical field of photocatalytic coatings and building energy saving. The coating is prepared from a photocatalytic packing, a temperature and humidity regulating packing, a film-forming material, a dispersing agent, a stabilizing agent, a wetting agent, a mildew preventive, a defoaming agent, a flatting agent, a thickener, a drier, a drying assistant, water and the like, wherein the photocatalytic packing is Eu-Ce/TiO2, and the temperature and humidity regulating packing is a SiO2 based hexadecanol-palmitic acid-lauric acid microcapsule temperature and humidity regulation material. The preparation method of the coating comprises the steps of (1) preparation of the photocatalytic packing, (2) preparation of the temperature and humidity regulating packing and (3) preparation of the interior wall coating having the multiple functions of temperature and humidity regulation and photocatalysis. The coating can conduct photocatalytic degradation on formaldehyde gas and regulate indoor temperature and humidity in the presence of a visible light source, effectively improves the indoor environment comfort and the quality of indoor air, reduces building energy consumption and conforms to the development trend of national green ecological building materials.

The invention discloses a method for rapidly synthesizing a molecular sieve supported nanometer photocatalyst, belonging to the technical field of photocatalysis. The method comprises the steps of adsorbing titanium dioxide and a precursor of metal nanoparticles by virtue of a capillary force of mesopores of a molecular sieve in a negative pressure environment, and supplementing a microwave-assisted alcohol thermal reduction method, so as to rapidly obtain the molecular sieve supported nanometer photocatalyst with high catalytic activity and stability. The preparation method is simple, feasible and beneficial to large-scale popularization.

The invention discloses a heterogenous photocatalyst with a multichannel carrier separation function and a preparation method and application of the heterogenous photocatalyst with the multichannel carrier separation function.The heterogenous photocatalyst 100% in total, comprises, by weight, 0.1-10% of ZnO and the balance mixed-phase titanium dioxide P25.The ZnO serving as a compound-phase component is dispersed in the catalyst uniformly, two phases are sufficiently mixed together, electron-hole produced by ultraviolet excitation of the P25 can be separated effectively, and the ZnO/P25 heterogenous photocatalyst demonstrates more excellent photocatalytic performance than the P25.When the heterogenous photocatalyst is applied to ultraviolet light catalytic reaction of low-concentration methylbenzene organic gas, methylbenzene in a system can be completely oxidized into carbon dioxide and water at room temperature.The preparation method is simple, mild in preparation conditions, convenient to operate and convenient for enlarged industrialized production.

The invention discloses a preparation method and an application of a copper-doped CQD (carbon quantum dot)/bismuth tungstate composite photocatalyst. The preparation method comprises the following steps: (1) preparation of copper-doped CQDs; (2) preparation of the copper-doped CQD/bismuth tungstate composite system. Photocatalytic performance of the prepared composite is tested by visible light, and superior photocatalytic performance of the material is proved by degradation of antibiotic ceftiofur sodium; the composite photocatalyst has good catalytic activity and stability, because electrontransfer in the photocatalytic process is enhanced by the copper-doped CQDs, capacity of an electron acceptor and an electron donor is improved, and the copper-doped CQDs act heterogeneously and synergistically with bismuth tungstate; after irradiation with visible light for 30 min, the degradation rate of ceftiofur sodium by the composite photocatalyst is remarkably increased as compared with thedegradation rate of the single copper-doped CQD and single bismuth tungstate.

The invention relates to the technical field of glass material preparation, in particular to a preparation method of efficient photocatalytic self-cleaning glass. The preparation method comprises thefollowing steps: mixing butyl ester titanate and absolute ethyl alcohol; doping ferric chloride and polyvinyl alcohol under an acid condition; hydrolyzing to obtain titanium dioxide sol; coating a glass plate to obtain efficient photocatalytic self-cleaning glass, wherein iron ions are reacted with titanium dioxide, so that the photocatalytic efficiency of the titanium dioxide is increased; underthe action of titanium dioxide loaded with a layer of silicon dioxide film, increases the adsorption of to a degradation product is increased; stronger hydroxyl groups are formed on the surface, and block the combination of electron hole pairs to generate strongly oxidizing active hydroxy, so that the photocatalytic reaction rate is increased; the titanium dioxide is partially compounded with thesilicon dioxide, so that a film becomes rough, the adsorption performance is enhanced, the efficient photocatalytic self-cleaning glass can change from hydrophobic to hydrophilic quickly and keeps a smaller contact angle, and the hydrophilic property of the self-cleaning glass is improved; and the efficient photocatalytic self-cleaning glass has a wide application prospect.

The invention relates to a preparation method of a porphyrin-based metal organic framework material sensitized oxide type catalyst. The porphyrin-based metal organic framework material sensitized oxide type catalyst is used for visible light catalytic degradation treatment of organic pollutants in water. A porphyrin-based metal organic framework material is used as a sensitizer, silver-cerium double-doped zinc oxide is used, and a sensitizing auxiliary agent is introduced, so that a photo-generated charge transmission channel is constructed, and the photocatalytic degradation performance undera visible light condition is enhanced. By investigating the degradation performance of the composite catalyst on a typical organic pollutant methylene blue in water under a visible light condition, the catalyst has good capacity of degrading organic matters in water under visible light.

The invention discloses a method for purifying air by combining electrochemical degradation with a photocatalysis technique. A device for implementing the method mainly consists of a filtering device, a flow type electrolytic bath which is formed by using Ti/PbO2 as an anode and a stainless steel plate as a cathode, and a photocatalysis reactor which is based on a zeolite-titanium dioxide photocatalyst. The method comprises the following steps: air containing pollutants and dust particles is subjected to fiber filtration firstly, then is subjected to an electrocatalysis oxidation reaction at the anode of the flow type electrolytic bath, and enters the photocatalysis reactor for further degradation after electrolysis. Through the combination of three kinds of technologies, the filtration effect of air is improved, the problem of low speed of a photocatalysis reaction is solved, the method thoroughly solves the problem of poor efficiency of a single module, and the air purification effect is not less than 90%.

The invention discloses a visible light response AgCl-Ag-Ag2CO3 composite photocatalyst, and a preparation method and application thereof. The composite photocatalyst is formed by compounding the following materials by mass percent: 30 to 60 percent of AgCl, 5 to 15 percent of Ag and 25 to 65 percent of Ag2CO3. The preparation method comprises the following steps: taking a certain volume of thermal spring water and stirring at the room temperature; slowly adding a certain volume of AgNO3 solution into the solution; after dropwise addition is finished, continuously stirring for 1 to 2 hours; centrifugally washing the obtained product by using deionized water; and drying to obtain the AgCl-Ag-Ag2CO3 composite photocatalyst. The method provided by the invention is simple in operating process and short in period; the used raw material thermal spring water is clean, cheap, distributed widely and low in cost; the synthesized AgCl-Ag-Ag2CO3 has high dispersibility. The AgCl-Ag-Ag2CO3 composition serves as a photocatalyst for degrading pollutants through photocatalysis, and the result shows that the AgCl-Ag-Ag2CO3 composite photocatalyst has excellent visible light degradation activity, can completely degrade methylene blue within 15 minutes, and has a good application prospect in the environmental protection fields of waste water treatment and the like.

The invention provides a catalytic ceramic membrane reactor. The reactor comprises a reactor body, wherein a catalytic ceramic membrane assembly, a catalytic energy supply system, an aeration system and a catalyst recovery system are arranged in the reactor body; the catalytic ceramic membrane assembly is arranged in the middle of the reactor body; the catalytic energy supply system is arranged onthe outer side of the catalytic ceramic membrane assembly; the aeration system and the catalyst recovery system are sequentially arranged below the catalytic ceramic membrane assembly; the reactor body is filled with a photocatalyst-containing sol system. The catalytic ceramic membrane reactor can effectively decompose organic matter, control membrane pollution, retain the catalyst, reduce membrane cleaning cost, achieve advanced treatment and improve effluent quality standards.

The invention relates to preparation of a composite photocatalyst and particularly relates to a composite photocatalyst loading P25 type nanometer TiO2-WO3 composite on nickel foam with a large specific surface area and having a good catalytic degradation effect. The preparation method comprises: dissolving ammonium tungstate in hot ammonia water, wet grinding the solution with P25, soaking and loading the product on nickel foam, drying the product at 100 DEG C, and calcining the product at 500 DEG C for 1 h to obtain a nickel foam loaded WO3/P25 photocatalytic material. The preparation method provided by the invention is simple, no expensive equipment is needed, the cost of the raw materials is low, the mechanical property is good; the photocatalytic degradation speed of the prepared catalyst is greatly improved compared with that of P25, and the prepared catalyst is used for degrading such harmful gases indoors or in automobiles as formaldehyde, and the like, and effectively solving the problems that a powdery photocatalyst is difficult to recycle and regenerate after being used.

The invention provides a BiOCl/graphite-like phase carbon nitride composite photocatalyst with a (010) crystal face exposed and a preparation method and application thereof. A light composite method is adopted, BiOCl is illuminated to generate electrons on the (010) crystal face, and holes are formed in the (100) and (001) crystal faces. The holes attract the layered structures g-C3N4 with negative charge through static electricity, the layered structures g-C3N4 are loaded on the (100) and (001) crystal faces with P4/nmm (129) BiOCl as tetragonal phases and space point groups, and the BiOCl (010) crystal face is exposed to form the BiOCl/g-C3N4 composite photocatalyst with the (010) crystal face exposed. The formed BiOCl/g-C3N4 composite photocatalyst with the (010) crystal face exposed has relatively high photocatalytic activity.

The invention discloses a photocatalytic gas-solid-liquid three-phase interface with adjustable wettability. The photocatalytic gas-solid-liquid three-phase interface comprises a hydrophobic carbon paper layer, a hydrophilic photocatalyst layer coated on a carbon paper, and a hydrophobic agent layer formed on the photocatalyst layer through grafting, wherein the hydrophobic agent layer is subjected to plasma treatment. In the application of the three-phase interface, the amount of water reaching the photocatalyst layer is regulated and controlled by regulating and controlling the wettability of the hydrophobic agent layer, so that the gas, the water and the photocatalyst layer reach a state beneficial to photocatalytic reaction, the photocatalytic reaction is promoted, and the applicationeffect of the three-phase interface in water treatment and sterilization is improved. Meanwhile, the invention further provides a preparation method of the three-phase interface and an application ofthe three-phase interface in water treatment and sterilization.

The invention discloses a preparation method of a carbon-coated synergistic carbon-sulfur codoped SnO2 photocatalyst. The preparation method comprises the following steps: (1) adding a tin source anda sulfur source to deionized water, performing ultrasonic dispersion for achieving uniformity, adding an organic solvent while stirring, transferring the obtained mixed solution into a reaction kettle, carrying out a solvothermal reaction, and washing, drying and grinding the obtained precipitate after the reaction is completed to form a uniform powder that is an MOF precursor; and (2) placing andcalcining the prepared MOF precursor powder prepard in step (1) in a muffle furnace, cooling the obtained sample to room temperature, and taking out and uniformly grinding the sample to obtain the carbon-coated synergistic carbon-sulfur codoped SnO2 photocatalyst. The photocatalyst of the invention has the advantages of simple preparation method, easy availability and low cost of raw materials, high yield, high photocatalytic carbon dioxide reduction performance and strong light corrosion resistance, and has a broad application prospect in the photocatalysis field.

The invention discloses an air purification method combined with electrochemical degradation and photocatalysis technology, which mainly consists of a filter device, a flow electrolytic cell with Ti/PbO2 as the anode and a stainless steel plate as the cathode, and a photocatalysis based on zeolite-titanium dioxide photocatalyst The reactor is composed of air containing pollutants and dust particles firstly filtered by fibers, and then electrocatalytic oxidation reaction occurs at the anode of the flow electrolytic cell, and then enters the photocatalytic reactor for further degradation after electrolysis. The present invention improves the air filtering effect through the combination of three processes, and improves the problem of low photocatalytic reaction rate. This method greatly improves the problem of poor efficiency of individual modules, so that the air purification effect is no less than 90%.