89 results about "Tio2 photocatalyst" patented technology

The invention provides an Au nanocluster-Cu monatomic / titanium dioxide photocatalyst as well as a preparation method and application thereof, and belongs to the technical field of photocatalysis. According to the invention, the Cu monatomic atom is used as a catalyst for hydrogen evolution reaction, the Cu monatomic atom and the Au nano-cluster are loaded at the same time, the Cu monatomic atom can be used as an electron transport bridge to regulate the electronic structure of the Au nano-cluster, the synergistic effect of the Cu monatomic atom and the Au nano-cluster is realized, the catalytic activity is regulated and controlled together, and efficient series connection of multi-step reaction is realized; therefore, the product selectivity can be accurately regulated and controlled; the catalytic oxidation reaction can be dynamically adjusted through carrier mediation or direct contact by virtue of the electron interaction between the Cu monatomic and the Au nano-cluster, so that the electron distribution in the catalytic process is favorably optimized, the reaction energy barrier of C-C bond breakage and hydroxymethyl oxidation is regulated and controlled, and the dynamic performance of generating GA and hydrogen through photocatalytic oxidation of EG is improved.

The invention relates to the technical field of wind power and power grid equipment anti-icing, and discloses a fluorosilicone oil microcapsule anti-icing coating for wind power and power grid equipment. Comprising the following components which are independently subpackaged: a component A, namely a nano ceramic pre-dispersion: 20-30 parts of methyltrimethoxysilane, 5-8 parts of tetraethoxysilane, 40-60 parts of isopropanol and 10-15 parts of silicon dioxide nanoparticles with perfluoroalkyl grafted on the surfaces; the component B is microcapsule dry powder: 25-40 parts of mesoporous alumina microcapsules filled with fluorosilicone oil, 1-4 parts of amino modified carbon nanotubes and 2-5 parts of an oxygen vacancy defect type titanium dioxide photocatalyst, the microcapsules are triggered to release the fluorosilicone oil through the volume expansion rate of a thermal expansion layer and stress sensitive layer composite wall material at low temperature, and meanwhile, when ice pressure exists, the stress sensitive layer can release the fluorosilicone oil, so that the stress sensitive layer can release the fluorosilicone oil. And the polydopamine-coated aluminum oxide layer is elastically deformed to synergistically release the fluorosilicone oil to form a dual-mode anti-icing mechanism.

The utility model relates to an air purification module, three-dimensional printing equipment and a three-dimensional printing system. The air purification module comprises an air inlet channel, a carrier unit, an illumination unit and an exhaust channel, and the carrier unit is loaded with a titanium dioxide photocatalyst; the illumination unit corresponds to the carrier unit and is used for emitting ultraviolet light; the exhaust channel communicates with the air inlet channel to form an airflow channel, the carrier unit and the illumination unit are both arranged in the airflow channel, and the airflow channel is used for communicating with a printing space where the three-dimensional printing equipment is located. According to the air purification module, the ultraviolet light emitted by the illumination unit and the titanium dioxide photocatalyst in the carrier unit are subjected to photochemical reaction, volatile organic compounds can be purified, meanwhile, due to the fact that the titanium dioxide photocatalyst in the carrier unit cannot be consumed, frequent replacement of the carrier unit can be avoided, and the service life of the air purification module is prolonged. The replacement frequency of the carrier unit and the photocatalyst can be reduced while the purification effect of the air purification module is improved.

This invention discloses a method for preparing P-TiO2 photocatalyst and a method for recycling waste Pd / Al2O3 catalyst. The P-TiO2 photocatalyst is prepared by a hydrothermal method. This invention provides a method for recycling waste Pd / Al2O3 catalyst using photocatalytic technology, comprising the following steps: Step A: Obtaining P-TiO2 photocatalyst; Step B: Mixing waste Pd / Al2O3 catalyst with P-TiO2 photocatalyst and a photocatalytic solvent, and carrying out a photocatalytic reaction under stirring and xenon lamp irradiation conditions to dissolve Pd in ​​the waste Pd / Al2O3 catalyst. After sufficient reaction, the Al2O3 support is first separated, and then the remaining solution is centrifuged to obtain a Pd-containing solution and P-TiO2 photocatalyst. This invention can effectively improve the recovery rate of Pd metal, and the entire process is green, environmentally friendly, and low-cost.

The invention relates to a method for green, mild and efficient synthesis of methylamine hydrochloride based on photocatalysis. According to the method, methanol and ammonium chloride which are wide in source and low in price are used as raw materials, under the anaerobic condition, a Pd / TiO2 photocatalyst is adopted for a photocatalytic reaction, and target methylamine hydrochloride products including monomethylamine hydrochloride, dimethylamine hydrochloride and trimethylamine hydrochloride are synthesized in one step. Compared with traditional industrial synthesis, the photocatalysis technology has the advantages of mild reaction conditions, simplicity and convenience in operation, environmental friendliness and the like, provides an efficient and feasible way for green synthesis of methylamine hydrochloride, and has a wide application prospect.

The invention discloses an application of a Pd / TiO2 photocatalyst in preparation of glycolaldehyde by selective oxidation of glycerol, and in the Pd / TiO2 photocatalyst, the particle size range of Pd is 0.5-25 nm. The Pd / TiO2 photocatalyst is used for preparing glycolaldehyde through selective oxidation of glycerol, the particle size of Pd is regulated and controlled, then the adsorption configuration of glycerol molecules is regulated and controlled, selective fracture of C-C bonds is promoted, along with increase of the particle size of Pd, the glycerol conversion rate, the glycolaldehyde selectivity and the formation rate are in a remarkable rising trend, and the stability is good and is far superior to that of an existing reported catalytic system.

The preparation method comprises the following steps: dissolving titanium potassium oxalate in water, sequentially adding ammonium sulfate and sodium chlorite, uniformly stirring to obtain a homogeneous mixed solution, and dropwise adding concentrated sulfuric acid to obtain a precursor solution; and carrying out hydrothermal reaction on the precursor solution, alternately washing the obtained precipitate with water and ethanol, and drying to obtain the efficient titanium dioxide photocatalyst. By accurately regulating and controlling the use amount of sodium chlorite, accurate regulation and control on the crystal phase composition of the product are successfully realized, and the prepared powder is in a blocky particle shape and has excellent monodispersity. According to the preparation process, subsequent high-temperature calcination or complex modification steps are not needed, energy consumption is reduced, doped element loss is avoided, the preparation process is simple and economical, and meanwhile the photocatalytic performance of titanium dioxide is remarkably improved. Compared with a commercial P25 photocatalyst, the double-phase titanium dioxide photocatalyst prepared by the invention has efficient degradation performance.

The invention discloses a transition metal modified carbon fiber loaded titanium dioxide photocatalyst as well as a preparation method and application thereof. The preparation method comprises the following steps: dispersing a first transition metal salt, a second transition metal salt, a coupling agent and biomass cellulose in a solvent for hydrothermal reaction to obtain transition metal modified composite biomass cellulose; then dispersing the transition metal modified composite biomass cellulose, titanium salt and urea in a solvent for a coupling reaction to obtain a titanium dioxide photocatalyst precursor; finally, the titanium dioxide photocatalyst precursor is sequentially subjected to pyrolysis treatment and lower activation treatment, and the titanium dioxide photocatalyst is obtained. According to the preparation method provided by the invention, a mode of first loading and then pore forming is adopted, so that the prepared titanium dioxide photocatalyst has excellent photocatalytic performance and stability.

The invention relates to the technical field of inorganic pigments, and particularly discloses a rutile type titanium dioxide pigment special for polycarbonate (PC). The rutile type TiO2 photocatalyst comprises a rutile type TiO2 core; the inner coating layer is a composite oxide of Al2O3 and ZrO2, and the molar ratio of Al to Zr is 1: (0.3-0.5); the middle coating layer is prepared from MgO nano particles; the outer coating layer is organic silicon resin containing epoxy groups; and the middle coating layer and the outer coating layer are coupled by adopting triisostearoyl titanate. The problems that in the prior art, a rutile titanium dioxide surface modification auxiliary (such as aluminum oxide) is extremely hydrophilic and easily adsorbs water molecules to initiate a hydrolysis reaction, a polysiloxane layer needs to be additionally arranged outside an aluminum oxide layer to prevent water, but the dense aluminum oxide layer prevents polysiloxane from permeating to the titanium dioxide surface, and the service life of the titanium dioxide surface is affected are solved. The anchoring efficiency of the modifier is reduced, a polysiloxane layer is easy to fall off, and the weather resistance is poor.

The utility model relates to the technical field of explosive explosion heat testing, and particularly discloses an explosion heat bomb gas replacement system which comprises a first electromagnetic valve, a second electromagnetic valve, a third electromagnetic valve, a pressure sensor, a nitrogen cylinder, an exhaust valve, a vacuum pump and a controller. The air outlet end of the second solenoid valve is connected with the vacuum pump through a pipeline. According to the utility model, the ultraviolet light catalytic reactor and the titanium dioxide photocatalyst are utilized to decompose combustible gas or harmful impurities; a filter is used for filtering gas exhausted from the explosion heat bomb, solid particles on the gas are intercepted, after gas replacement is finished, a sixth electromagnetic valve and a fifth electromagnetic valve are opened, a gas adding pump and a gas extracting pump are started at the same time, gas generated by the gas adding pump blows up the solid particles attached to the top and the bottom of a filter plate, and the solid particles on the gas are removed. And blown solid particles are sucked away by using the sucking pump, so that the cleanliness of the interior of the filter is improved.

The invention belongs to the field of environmental protection and air purification, and particularly relates to a nitrogen-doped titanium dioxide loaded copper nanoparticle photocatalyst as well as a preparation method and application thereof. The preparation method comprises the following steps: synthesizing an N-TiO2 carrier through a low-temperature hydrolysis method, and loading Cu NPs on the N-TiO2 carrier through a wet impregnation method to prepare the Cu / N-TiO2 catalyst. The Cu / N-TiO2 photocatalyst obtained by the invention can effectively catalyze and remove NO and CO under the conditions of 120-210 DEG C and visible light, and has good stability and NH3 selectivity. Compared with an N-TiO2 carrier, the performance of removing NO and CO through photocatalysis and the NH3 selectivity are obviously improved. The high-cost limitation of a traditional noble metal catalyst is broken through, an innovative solution is provided for low-temperature photo-thermal synergistic purification of motor vehicle exhaust, and application and popularization are facilitated.

The invention provides a method for preparing a dopamine-coated titanium dioxide photocatalyst based on a hydrothermal method, which comprises the following steps: dispersing titanium dioxide powder in deionized water, and carrying out ultrasonic treatment to obtain a uniform titanium dioxide suspension; dissolving a buffer agent in deionized water to prepare a buffer solution, or directly adopting an alkaline solution to adjust the pH value of the titanium dioxide suspension to 7.5-10.0; dopamine hydrochloride is added into the titanium dioxide suspension liquid with the pH value adjusted, stirring is conducted till dopamine is fully dispersed, and a mixed precursor solution is obtained; transferring the mixed precursor solution into a hydrothermal reaction kettle for reaction; after the reaction is finished, naturally cooling to room temperature, collecting a reaction product, and centrifuging, washing and drying to obtain a titanium dioxide photocatalyst coated with polydopamine; by constructing a polydopamine-titanium dioxide core-shell structure, the coupling of adsorption enrichment and photocatalytic degradation is realized, and the purification efficiency of the catalyst on volatile organic compounds in a visible light environment in a cabin is improved.

This invention provides an AgBi alloy-modified titanium dioxide photocatalyst, its preparation method, and its application, belonging to the field of materials preparation technology. The AgBi alloy-modified titanium dioxide photocatalyst provided by this invention includes a titanium dioxide support and AgBi alloy loaded on the surface of the titanium dioxide support. x Bi y Alloy. Experimental studies have shown that the AgBi alloy-modified titanium dioxide photocatalyst can significantly reduce the types of byproducts in the CO2-CH4 conversion, while significantly improving the selectivity and formation rate of CH4.

A method for in situ construction of a wide-band visible / ultraviolet dual heterostructure of titanium dioxide @ sodium titanate and titanium dioxide @ tungsten trioxide on a titanium surface, relating to methods for constructing dual heterostructures. The present invention addresses the problem of existing TiO2 photocatalysts having poor degradation capabilities for organic dye wastewater and being non-recyclable. The method includes: 1. micro-arc oxidation treatment; 2. microwave hydrothermal treatment; 3. ion deposition exchange treatment; and 4. de-crystallization treatment. The present invention is used to in situ construct a wide-band visible / ultraviolet dual heterostructure of titanium dioxide @ sodium titanate and titanium dioxide @ tungsten trioxide on a titanium surface.

The invention belongs to the technical field of air purification functional materials, and relates to a degradable particulate matter and VOCs protective laminated cellulose paper-based material and a preparation method thereof. The material comprises a physical adsorption layer, a catalytic decomposition layer and a chemical adsorption layer, the physical adsorption layer is a paper-based material formed by compounding cellulose fibers and montmorillonite, the catalytic decomposition layer is a paper-based material formed by compounding cellulose fibers and titanium dioxide, and the chemical adsorption layer is a paper-based material formed by modifying cellulose fibers through amino silane. The physical adsorption layer not only preliminarily adsorbs the VOCs, but also prolongs the residence time of the VOCs in the catalytic layer, and provides more sufficient conditions for photocatalytic reaction. Then, VOCs enter a catalytic decomposition layer and are efficiently degraded into harmless substances under the action of a titanium dioxide photocatalyst. The photocatalytic reaction efficiency and the overall removal rate of VOCs are remarkably improved, and meanwhile, the problem of incomplete catalysis caused by too fast airflow is solved.

The application discloses a kind of stable crystal form photocatalyst and its preparation method, application, belong to photocatalyst technical field, the catalyst is 1-ethyl-3-methyl imidazole tetrafluoroborate ion liquid assisted La doped TiO2 Photocatalyst, La doping ratio 0.12-0.13%, ion liquid content 12-13 mL / mg.It is prepared using sol-gel method, by precisely controlling A, B liquid ratio and 595-605 DEG C, 1.8-2.2h calcination process, realize lattice defect controllable and crystal form stable.When applied, the mass ratio of catalyst and rhodamine B is 99-101:1, and rhodamine B in wastewater can be efficiently degraded under illumination for ≥80 min, with a degradation rate of ≥92%.The degradation rate is still ≥88% after being reused for 5 times.The catalyst has stable crystal form, high photocatalytic efficiency, environmental protection and economy, and is suitable for treating wastewater containing rhodamine B in multiple industries.

This invention discloses a method for preparing a silver-cobalt bimetallic single-atom supported titanium carbide / titanium dioxide photocatalyst and its application in the selective photocatalytic reduction of carbon dioxide to methane. The method uses layered titanium carbide (Ti3C2 MXene) as a substrate, utilizing its abundant titanium vacancies to achieve in-situ anchoring of silver and cobalt atoms under mild conditions, obtaining atomically dispersed Ag and Co bimetallic single-atom active sites. Subsequently, a titanium dioxide (TiO2) layer is grown in-situ on the Ti3C2 MXene surface through hydrothermal treatment, constructing a tightly coupled Ti3C2 / TiO2 heterostructure, thereby forming a bimetallic single-atom photocatalytic interface with a synergistic effect. The prepared photocatalyst is applied for the first time in the field of photocatalytic carbon dioxide reduction, exhibiting excellent carbon dioxide photoreduction performance under visible light irradiation without sacrificial reagents, and showing high selectivity and a high methane formation rate. The preparation process of this invention is simple and highly controllable, and the obtained bimetallic single-atom photocatalyst provides a new catalyst design concept and technical solution for the high-selectivity conversion of carbon dioxide and the development of related new energy technologies.

The present invention relates to a photocatalyst and a preparation method therefor. The photocatalyst according to the present invention comprises titanium dioxide with a bronze crystal phase and an anatase crystal phase so as to have high photoactivity, and thus is suitable for removing odors and toxic gases. In addition, the titanium dioxide included in the photocatalyst, according to the present invention, has a novel crystal phase having a charge separation effect superior to those of other crystal phases, and thus has improved photoactivity. Additionally, the photocatalyst of the present invention has high photoactivity, and thus is suitable for removing odors and toxic gases. In addition, the photocatalyst of the present invention has excellent durability against catalytic poisons formed on the surface of a catalyst during removal of VOCs and toxic gases (acetaldehyde, isovaleraldehyde, isovaleric acid and toluene).

The application discloses a corn straw modified titanium dioxide photocatalyst, a preparation method and application thereof. The preparation method comprises the following steps: (1) crushing corn straw, calcining the crushed corn straw, and obtaining calcined corn straw; (2) mixing the calcined corn straw, ethanol and water to obtain a mixed solution A; mixing tetrabutyl titanate, glacial acetic acid and ethanol to obtain a mixed solution B; adding the mixed solution A into the mixed solution B to react, and then standing to obtain a gel; wherein the mass ratio of the corn straw to the tetrabutyl titanate is 0.05-0.15:100; wherein the mass of the tetrabutyl titanate is calculated based on the mass of completely formed titanium dioxide; (3) drying the gel to obtain a dry gel; and calcining the dry gel to obtain the corn straw modified titanium dioxide photocatalyst. The modified titanium dioxide photocatalyst can be used for degrading organic dye sewage, and can effectively degrade methyl violet in particular.

The utility model discloses a novel landfill leachate treatment system which comprises a high-density sedimentation tank, an outdoor regulating tank, an activated carbon and sand added high-density sedimentation tank, a denitrification and nitrification tank, a denitrification tank, a biological rotary disc filter and a nanofiltration system which are connected in sequence. Then enabling the filtrate to enter an adjusting tank containing a titanium dioxide photocatalyst at the periphery for photocatalysis, and degrading part of refractory organic matters into CO2 and H2O; effluent enters Actiflocarb, and particulate matters, heavy metals, organic matters, chromaticity and the like are removed through combination of activated carbon and coagulation and flocculation; then entering a Biostyr NDN and a Biostyr PDN, and carrying out biochemical treatment, so as to degrade ammonia nitrogen; effluent enters nanofiltration through the biological rotating disc, so that organic matters, multivalent ions, chromaticity and SS in water are further removed, and the effluent is discharged after reaching the standard.

The invention discloses a BiOCl / TiO2 photocatalyst prepared by an electrochemical method as well as a preparation method and application thereof, and the preparation method of the BiOCl / TiO2 photocatalyst comprises the following steps: 1) placing a Ti sheet subjected to surface pretreatment in an aqueous solution containing F <-> for anodic oxidation, and then placing the Ti sheet in a muffle furnace for heat treatment to obtain an anatase type TiO2 nanotube; 2) taking the TiO2 nanotube as a working electrode, and obtaining Bi nanocrystals in a water solution containing Bi (NO3) 3 with a certain concentration, lignin calcium benzenesulfonate and an emulsifier OP-10 by adopting a pulse electrodeposition method; 3, the sample with the Bi nanocrystals deposited is subjected to electrooxidation in a Cl <-> solution under the specific pH condition, and the BiOCl / TiO2 photocatalyst is obtained.The BiOCl / TiO2 photocatalyst prepared through the electrochemical method has the advantages of being stable in structure, high in CO2 photocatalytic reduction activity and high in product selectivity.

The application discloses an air water making direct drinking machine, which comprises a filter part, the filter part comprises a first activated carbon filter layer, a second activated carbon filter layer, a nano Ag + coating layer, a TiO2 photocatalyst filter screen and an ultraviolet light emitting device, one side of the first activated carbon filter layer is provided with the nano Ag + coating layer without gap, one side of the nano Ag + coating layer is provided with the TiO2 photocatalyst filter screen without gap, one side of the TiO2 photocatalyst filter screen is provided with the second activated carbon treatment layer with gap, and the ultraviolet light emitting device is arranged in the gap; the application further discloses a preparation process of the filter part and an air water making direct drinking machine adopting the filter part. By tightly pressing the activated carbon treatment layer, the nano Ag + coating layer and the TiO2 photocatalyst filter screen together, the gap between different layers is cancelled, the nano Ag + coating layer is sprayed on the TiO2 photocatalyst filter screen in a certain thickness, bacteria and viruses are attached to the nano Ag + coating layer at the same time, and the bacteria and viruses are killed by the nano Ag + coating layer and the TiO2 photocatalyst, and the killing effect is large and sufficient.

The application discloses a carbon-coated nitrogen-doped titanium dioxide photocatalyst for removing ammonia and a preparation method thereof. In the synthesis process, TiO2 is first subjected to crystal modification, nitrogen-containing substances such as ethylenediamine and urea are used as nitrogen sources, and nitrogen-doped TiO2 is first synthesized through a one-step solvothermal method. Then, the surface of the nitrogen-doped TiO2 is coated on the basis of the nitrogen-doped TiO2, organic substances are used as carbon sources, the organic substances and the N-doped TiO2 powder are fully mixed in an ethanol solution through mechanical stirring, and then the mixture is dried and finally calcined in a tube furnace under an inert gas atmosphere to obtain the photocatalyst. The photocatalyst can maintain a high NH3 removal rate for a long time, can obtain high N2 selectivity, can remove pollutants, and can reduce secondary pollution to the environment. The catalyst has low preparation and application costs, and can be applied to the photocatalytic oxidation removal of NH3 under room temperature conditions.

The utility model discloses a factory-like circulating water fish culture system which comprises an artificial culture container, a settling pond, a first filter, a photocatalytic degradation device, a biochemical pond and a second filter which are sequentially connected, and a water outlet of the second filter is communicated with a water inlet of the artificial culture container. The photocatalytic degradation device comprises a tank body, a lower-layer filter plate, an upper-layer filter plate, a transparent tube group, an ultraviolet lamp tube and a transparent filler. The lower-layer filter plate is horizontally fixed in an inner cavity of the tank body, the upper-layer filter plate is positioned above the lower-layer filter plate, a transparent tube group is arranged between the lower-layer filter plate and the upper-layer filter plate, and the ultraviolet lamp tube is sealed in the transparent tube group. The spherical transparent filler is filled in a space between the lower-layer filter plate and the upper-layer filter plate, and a titanium dioxide photocatalyst is loaded on the surface of the transparent filler. The culture system can accelerate the removal efficiency of organic matters in culture circulating water, so that the treatment rate of a microbial purification link is accelerated, and the treatment process of the whole circulating water is accelerated.

This invention discloses a method for preparing a high-efficiency photocatalyst and a method for enhancing Fenton flue gas denitrification using a photocatalyst, belonging to the field of photocatalytic-oxidative wet denitrification technology. First, tetrabutyl titanate is used as a Ti source, and hydrofluoric acid solution is used as a crystal facet modifier. Through a solvothermal reaction, F-TiO2 with a high (001) crystal facet is obtained. Then, sodium iodate is used as an electron sacrificial agent, cobalt salt is used as a Co precursor, and the F-TiO2 with the high (001) crystal facet is used as a support. After uniform mixing, cobalt oxide selectively loaded on the (001) crystal facet of high (001) crystal facet titanium dioxide is generated under ultraviolet light, yielding CoO. x @F-TiO2 photocatalyst. And F-TiO2 and CoO x @F-TiO2 photocatalyst is used for Fenton denitrification of flue gas. It solves the problem of excessive Fe(III) accumulation in Fenton denitrification, accelerates the iron cycle in the reaction, and improves the denitrification capacity of the Fenton reaction.

The invention relates to the technical field of membrane separation, and discloses a multi-stage membrane separation coupling photocatalytic oxidation system and application thereof.The multi-stage membrane comprises a composite membrane base material, a microporous polymer layer and an ultrathin polyamide layer, and the composite membrane base material is prepared from, by mass, 15-20 parts of polyvinylidene fluoride, 2-6 parts of polyvinylpyrrolidone, 1-3 parts of N, N-dimethylformamide, 1-3 parts of a coupling agent, 1-3 parts of a coupling agent and 1-3 parts of a coupling agent; the oxidation system comprises a sedimentation tank, a sewage treatment tank, an ultraviolet lamp, a multi-stage membrane and an effluent buffer tank. In the photocatalytic oxidation stage, a TiO2 nanotube array loaded with precious metal platinum (Pt) is innovatively selected as a catalyst, and different from a traditional TiO2 photocatalyst, the composite material not only improves the photocatalytic efficiency, but also enhances the stability of the catalyst, and the improvement can significantly improve the degradation capacity of refractory organics, so that the photocatalytic performance of the composite material is improved. Particularly, the removal efficiency of pollutants such as antibiotics and endocrine disruptors in water is outstanding.

The invention discloses a Bi2MoO6 / Au / TiO2 photocatalyst containing an S-type heterojunction and plasma Au as well as a preparation method and application of the Bi2MoO6 / Au / TiO2 photocatalyst, and belongs to the technical field of chemical catalysis. The preparation method disclosed by the invention comprises the following steps: S1, stirring and mixing Na2MoO4. 2H2O and Bi (NO3). 5H2O, then carrying out solvothermal reaction to obtain a Bi2MoO6 solution, and carrying out post-treatment to obtain a Bi2MoO6 photocatalyst; s2, dissolving the Bi2MoO6 photocatalyst, adding HAuBr4, carrying out ultrasonic treatment, stirring, illuminating under a xenon lamp to obtain a Bi2MoO6 / Au solution, and carrying out post-treatment to obtain a Bi2MoO6 / Au photocatalyst; and S3, stirring and mixing the Bi2MoO6 / Au photocatalyst and tetrabutyl titanate, carrying out a water bath heating reaction to obtain a Bi2MoO6 / Au / TiO2 solution, and carrying out post-treatment to obtain the Bi2MoO6 / Au / TiO2 photocatalyst containing the S-type heterojunction and the plasma Au. According to the method, the separation efficiency of photon-generated carriers is improved, the absorption range of visible light is widened, the capability of photocatalytic conversion of sodium lignin sulfonate is improved, and the technical problems that when an existing Bi2MoO6 catalyst is used for photocatalytic conversion of lignin, the visible light response range is small, and electrons and holes are easy to compound are solved.

The invention discloses a method for producing hydrogen through photocatalysis by using waste crab shells and a method for producing hydrogen through photocatalysis by using chitin, and belongs to the technical field of hydrogen production through photocatalysis. The method comprises the following steps: (1) carrying out ball milling on crab shell powder or chitin powder to obtain a to-be-leached substance; (2) placing the to-be-leached substance in 10-50 times of water, stirring and leaching, carrying out solid-liquid separation, and collecting filtrate to obtain a depolymerization solution; and (3) adding a TiO2 photocatalyst into the depolymerization solution to obtain a suspension, placing the suspension in a reaction system, carrying out vacuum pumping treatment, and carrying out photocatalysis for 1-6 hours under the irradiation of a xenon lamp or an ultraviolet lamp to obtain a reaction gas. According to the method, waste crab shells or chitin is used as a raw material, a depolymerization solution with high N-acetylglucosamine content is obtained through ball milling treatment, hydrogen is produced through catalysis of a TiO2 photocatalyst, and the method has the advantages of being convenient to operate, environmentally friendly, low in cost and high in hydrogen production efficiency.

The application belongs to the technical field of fine chemical synthesis, and particularly relates to a preparation method of 3,3',5,5'-tetra-tert-butyl-4,4'-diphenyl-diphenol, which comprises the following steps: S1 raw material pretreatment: after 2,6-di-tert-butyl phenol is vacuum dried, a nano zinc oxide-montmorillonite composite catalyst is added and uniformly mixed; in the scheme, by adopting a double-catalyst system composed of a nano zinc oxide-montmorillonite composite catalyst and a TiO2 photocatalyst modified by carbon nitride quantum dots, a synergistic process of microwave-assisted oxidative coupling and photocatalytic reduction is combined, key parameters such as reaction temperature, pressure and time are optimized, and a multi-stage purification process of supercritical CO2 extraction-recrystallization is matched, so that efficient recovery and recycling of the catalyst are realized, high-quality products with a purity of greater than or equal to 99.5% and a colority of less than or equal to 8 (APHA) are finally prepared, the total reaction time is shortened to 6-7 hours, the number of times of repeated use of the catalyst reaches 5-8 times, and the efficiency, economy and product quality stability of the process are significantly improved.

The invention provides a two-dimensional / two-dimensional structure composite photocatalyst as well as a preparation method and application thereof, and relates to the technical field of photocatalysis. The two-dimensional / two-dimensional structure composite photocatalyst provided by the invention comprises a two-dimensional TiO2 nanosheet and an ultrathin two-dimensional Ni metal nanosheet loaded on the two-dimensional TiO2 nanosheet. According to the preparation method disclosed by the invention, the ultrathin two-dimensional Ni metal nanosheet is used as a cocatalyst, the ultrathin two-dimensional Ni metal nanosheet and the two-dimensional TiO2 nanosheet can form a tightly coupled two-dimensional / two-dimensional structure, and the separation and migration efficiency of photon-generated carriers can be remarkably improved, so that the photocatalytic hydrogen production performance is improved. The result of the embodiment shows that the hydrogen production performance of the two-dimensional / two-dimensional structure composite photocatalyst provided by the invention is improved compared with the performance of a noble metal Pt-loaded TiO2 photocatalyst, so that the composite photocatalyst can become a more efficient and relatively cheap catalyst for replacing the noble metal Pt-loaded TiO2 in the field of photocatalysis.