74results about How to "Improve redox ability" patented technology

The invention relates to a metal additive modified Pt-loaded CeO2 catalyst, preparation and application thereof in CO oxidation, and belongs to the technical field of industrial catalysis. The preparation process of the catalyst mainly comprises the following steps: respectively dissolving cerium salt, platinum salt and auxiliary metal salt in deionized water to prepare corresponding precursor solutions; then, mixing the three solutions, and dropwise adding ammonia water under a stirring condition until yellow precipitates are generated; and finally, drying and washing the precipitate, and calcining the solid powder in a proper atmosphere to obtain the assistant metal modified Pt / CeO2 catalyst. La, Pr, Nd or Sm auxiliary metal is introduced into the Pt / CeO2 catalyst, so that the CO catalytic oxidation performance of the catalyst can be improved, and the poisoning resistance of the catalyst in an SO2-containing environment can be enhanced. The method has important significance in the actual industrial application, especially in the catalytic oxidation process under the condition of treating complex flue gas.

The invention provides a nanometer casting and doping double-strategy improved lanthanum manganese perovskite catalyst, a preparation method thereof and application of the nanometer casting and doping double-strategy improved lanthanum manganese perovskite catalyst in degradation of halogenated organic pollutants. The preparation method of the nanometer casting and doping double-strategy improved lanthanum manganese perovskite catalyst comprises the following steps: taking transition metal salt as a doping agent, and mixing transition metal salt, lanthanum salt, manganese salt and a complexing agent in a solvent to form a mixed solution; then adding nano silicon dioxide, stirring and heating to a gel state, and drying to obtain a solid precursor; calcining the solid precursor to obtain a calcined product which comprises nano silicon dioxide and transition metal doped lanthanum manganese perovskite; and adding the calcined product into an alkaline solution, and etching to remove the nano silicon dioxide to form a nano pore channel structure so as to prepare the nano casting and doping double-strategy improved lanthanum manganese perovskite catalyst. The nano casting and doping double strategies have a synergistic improvement effect on lanthanum manganese perovskite, and the catalytic performance of the obtained catalyst is remarkably superior to that of a single-strategy improved catalyst.

The invention relates to the field of 3D printing and catalytic materials, and discloses a method for preparing a manganese-based catalyst through 3D printing, the prepared catalyst and application, the method comprises the following steps: (1) mixing a photosensitive resin mixed solution with ceramic powder to obtain photosensitive ceramic slurry, and carrying out 3D printing to obtain a printing blank; (2) degreasing and sintering the printing green body to obtain a 3D printing ceramic carrier; and (3) coating the surface of the 3D printing ceramic carrier with the slurry containing the manganese oxide, and roasting to obtain the manganese-based catalyst. According to the method, effective preparation of the manganese-based catalyst is achieved in a coating mode, the coating method is easy and convenient to operate and suitable for batch production, the carrier prepared in a 3D printing mode has a communicated pore channel structure, active components are fully distributed on the surface of the carrier, and the catalytic oxidation activity of the catalyst is improved.

The invention belongs to the technical field of high-valued utilization of biomass, and particularly relates to a production process for preparing hydrocarbon-rich bio-jet fuel through biomass staged pyrolysis coupling aldol condensation hydroconversion. According to the production process for preparing the hydrocarbon-rich bio-jet fuel by coupling biomass grading pyrolysis with aldol condensation hydroconversion, a grading pyrolysis technology is adopted, different temperature intervals are set according to pyrolysis characteristics of three major components of biomass, and pyrolysis steam with relatively enriched component content is collected step by step. The method effectively reduces the complexity of the bio-oil component, selectively prepares the pyrolysis steam rich in aldehyde and ketone and easy in aldehyde and ketonization through process regulation and control, effectively separates the pyrolysis component not easy in aldehyde and ketonization, obviously improves the yield of hydrocarbon compounds and the selectivity of the hydrocarbon compounds in graded pyrolysis of the bio-oil, and lays a foundation for subsequent directional conversion and product separation.

The invention provides a preparation method of a corrugated plate type flue gas comprehensive treatment catalyst, which comprises the following steps: impregnating glass fiber paper in a forming liquid, drying to obtain glass fiber flat paper, pressing the glass fiber flat paper into glass fiber corrugated paper, and alternately stacking and bonding the glass fiber flat paper and the glass fiber corrugated paper to obtain a forming framework; dipping the prepared forming framework in carrier slurry, and then drying and calcining to obtain a carrier; impregnating the prepared carrier in a first functional component impregnation liquid, and then performing suction filtration and calcination to obtain a catalyst precursor; and impregnating the prepared catalyst precursor in a second functional component impregnation liquid, reducing and drying to obtain a catalyst finished product, wherein the second functional component impregnation liquid comprises a noble metal precursor. By improving the corrugated plate structure of the catalyst and the formula of the active components, the prepared catalyst has the advantages of high reaction airspeed, high catalytic activity, good stability and the like, and has the advantages of simple preparation process and easiness in operation.

The invention discloses a Co-MOF / TiO2 heterojunction-based photocatalysis-PMS activation catalyst and a preparation method and application thereof, specifically, TiO2 nanosheets and porphyrin-based MOF are coupled to construct a Co-MOF / TiO2 heterojunction hybrid material, and the material has the performance of synergistic photocatalysis of peroxymonosulfate activation and is used for catalyzing degradation-resistant bisphenol A, PMS, PMS, PMS, PMS, PMS and PMS. The compound is an effective synergistic photocatalyst and has many advantages that (i) the porous structure of the metal organic framework promotes mass transfer in the catalytic process, so that the catalytic process is further promoted; (ii) a chromophore at the center of a porphyrin structure can enhance the light capturing ability of the metal organic framework (under visible light, photoinduced electrons can be continuously migrated to adsorbed PMS to promote the activation process of the PMS); and (iii) the heterojunction formed between the TiO2 and the Co-porphyrin ligand further promotes the separation of photon-generated carriers.

The invention discloses a synthesis method of 2-chloro-4-nitro-6-bromo-aniline, and relates to the technical field of chemical industry of disperse dye intermediates. When 2-chloro-4-nitro-6-bromo-aniline is synthesized, silicon dioxide coated magnetic nanoparticles are firstly prepared, then doped heteropoly acid is prepared, and further modification is performed to prepare modified heteropoly acid; loading the modified heteropolyacid on the silicon dioxide coated magnetic nanoparticles to prepare a magnetic loaded heteropolyacid catalyst; according to the method, 2-chloroaniline is used as a raw material and is firstly nitrified and then brominated under the catalytic action of a magnetic supported heteropolyacid catalyst to obtain the product 2-chloro-4-nitro-6-bromo-aniline. The method for synthesizing the 2-chloro-4-nitro-6-bromo-aniline has the advantages of high raw material conversion rate, good selectivity, high product purity and small wastewater amount.

The invention relates to a preparation method of a monolithic catalyst for methane catalytic combustion, which comprises the following steps: dipping a honeycomb carrier in titanium dioxide sol, taking out, drying, and roasting to obtain a carrier with a TiO2 coating; the carrier with the TiO2 coating is soaked in an active metal salt solution, 3-(trifluoroacetamido) pyrrolidine hydrochloride is added into the active metal salt solution, active metal is perovskite type metal composite oxide, the structural general formula is ABO, the carrier is taken out, dried and roasted, and the monolithic catalyst is obtained. The monolithic catalyst provided by the invention is used for catalytic combustion of methane, T90 is less than or equal to 500 DEG C, and the monolithic catalyst has the advantages of high low-temperature catalytic activity, good activity retention after long-term use and the like.

The invention discloses a preparation method of a VOCs oxidation catalyst, precious metal is dispersed in heteropolyacid through a self-propagating method, the activity of the precious metal is improved, and meanwhile, the cage-shaped structure of the heteropolyacid can be used as a supporting framework of the precious metal to improve the overall mechanical strength and stability of the catalyst; then the obtained powder catalyst and a second carrier are prepared into coating slurry together, cordierite is coated with the coating slurry through dipping, the coating is modified after drying, and therefore the competitive adsorption effect of water vapor on reaction gas on active sites is reduced, and the catalyst can be suitable for the VOCs treatment process with the high water content and the low operating temperature.

The invention discloses a preparation method of a zirconium oxide catalyst and application of the zirconium oxide catalyst in catalytic co-production of hydrogen and carbon monoxide, and belongs to the technical field of resource recovery, and the preparation method comprises the following steps: (1) dissolving a zirconium source and a complexing agent in water, and stirring at a high speed to obtain a clear solution; (2) dropwise adding alkali liquor into the solution obtained in the step (1) to adjust the pH value of the solution, then adding a dispersing agent, and refluxing and stirring the obtained solution for 10-12 hours at a certain temperature; (3) adding ammonium bicarbonate into the solution obtained in the step (2), then transferring the solution into a crystallization kettle, and crystallizing at a certain temperature; (4) filtering, washing, drying and grinding the product obtained in the step (3) into powder, and then putting the powder into dielectric barrier discharge plasma equipment for treatment; and (5) roasting the treated sample obtained in the step (4) in a muffle furnace to obtain the zirconium oxide catalyst. The catalyst is simple in preparation method, high in repetition rate and suitable for large-scale industrial production.

The invention discloses a catalyst for adsorption-photo-thermal synergistic degradation of VOCs and a preparation method thereof.A photocatalytic material TiO2, a thermocatalytic material MnOx and hollow carbon spheres are combined, the hollow carbon spheres (GCS) are used as a supporting framework, MnO2 and TiO2 are introduced into the GCS through a microwave-hydrothermal method, and the catalyst is prepared. The preparation method comprises the following steps: firstly, preparing a TiO2 (at) MnO2 (at) GCS multifunctional photo-thermal catalytic material with a core-shell structure by using an in-situ calcination reduction process, and constructing a photo-thermal synergistic catalytic composite system with adsorption, thermocatalysis and photocatalysis, so that the problems of high energy consumption, low photocatalysis quantum efficiency and the like of traditional thermocatalysis can be solved, and VOCs can be efficiently degraded.

The utility model discloses a deburring device for lock cylinder processing, which comprises a shell, and the front surface of the shell is movably connected with an opening and closing door. The treatment mechanism is arranged, dust enters the treatment box through the dust suction inlet, the telescopic pipe and the conveying pipe by means of an exhaust fan and then sequentially passes through the UA light oxygen lamp, the catalytic plate and the biological nano-membrane, harmful substances in gas can be decomposed by the UA light oxygen lamp to achieve the purification effect, the catalytic plate is arranged in a nano-screen shape, and therefore the purification effect is improved. The surface of the catalytic plate is coated with the nano titanium dioxide layer, the nano titanium dioxide layer has an extremely strong oxidation reduction effect under irradiation of a UA light oxygen lamp, bacteria flowing through the surface of the catalytic plate can be decomposed, dust in gas can be intercepted while decomposition is conducted, the biological nano film can conduct secondary interception on the dust so that the dust can be automatically degraded from the surface of a net opening, and therefore the dust removal effect is improved. Therefore, the health of personnel is not harmed, and the cleaning difficulty of the device by the personnel is not increased.

The invention discloses a rare earth tailing-based aerogel catalyst for refractory coal and a preparation method thereof, and the preparation method comprises the following steps: a, pretreating rare earth tailings rich in cerium oxide to obtain raw material powder; b, carrying out modification treatment on the raw material powder obtained in the step a to obtain modified powder; and c, preparing rare earth tailing-based aerogel from the modified powder obtained in the step b, and grinding to obtain the catalyst. The rare earth tailing-based aerogel catalyst prepared by the invention has a relatively high specific surface area and a rich pore structure, obviously improves the combustion efficiency of fire coal, can be suitable for fire-retardant solid fuel, realizes wide-load stable combustion of fire-retardant coal powder, expands the coal type adaptability of a unit, reduces the use amount of long flame coal, and reduces the production cost. The coking problem is effectively solved.

The invention discloses a desulfurization ash-based denitrification nitrogen removal filter material as well as a preparation method and application thereof. The desulfurization ash-based denitrification nitrogen removal filter material is prepared from the following raw materials in parts by weight: 150 to 255 parts of elemental sulfur, 1 to 55 parts of calcium carbonate and 1 to 55 parts of desulfurization ash. The desulfurization ash-based denitrification nitrogen removal filter material can be used for nitrogen removal of nitrate nitrogen-containing wastewater, and the effect is excellent. According to the desulfurization ash-based denitrification nitrogen removal filter material, the sulfur electron donor material serves as a main active component, the main component in desulfurization ash is CaSO3, and + 4-valent sulfur contained in the desulfurization ash and 0-valent sulfur in sulfur have a synergistic effect, so that the oxidation reduction effect with NO3 <-> in water is effectively improved, and the denitrification effect is excellent; the industrial solid waste desulfurization ash and calcium carbonate are compounded to prepare the denitrification nitrogen removal filter material, so that the purposes of treating waste with waste, reducing cost and increasing efficiency are achieved, the dual purposes of high-value utilization of the industrial solid waste desulfurization ash and high-efficiency treatment of wastewater are achieved, and wide market prospects are achieved.

The invention provides a Cs3Bi2Br9 / BiOCl composite material as well as a preparation method and application thereof, and relates to the technical field of photocatalytic materials. The preparation method comprises the following steps: firstly, preparing BiOCl through a solvothermal method, then adding the BiOCl into a dimethyl sulfoxide solution of CsBr-BiBr3, stirring to disperse the BiOCl, and drying the BiOCl in a drying oven; and dropwise adding isopropyl alcohol (IPA) into the obtained solid, after the reaction is completed, centrifugally collecting a sample, cleaning the sample with ethanol, centrifugally collecting the cleaned sample, and drying in a drying oven to obtain the Cs3Bi2Br9 / BiOCl composite material. The preparation method of the Cs3Bi2Br9 / BiOCl composite material is simple in operation process, and the prepared material is high in yield and low in cost. The prepared Cs3Bi2Br9 / BiOCl composite material has the photocatalytic capability under a full spectrum, and has a wide application prospect.

The present invention relates to an oxygen defect-modified ferroelectric compound Z-type heterojunction photocatalytic material and a preparation method and application thereof, and belongs to the field of photocatalytic technology. The present invention utilizes bismuth tungstate and carbon nitride to construct a heterojunction while introducing an oxygen defect state, thereby forming an amorphous layer with a large number of electron donor states concentrated at the heterojunction interface to stabilize the formation of the heterojunction. The introduction of oxygen vacancies, on the one hand, introduces donor energy levels inside the ferroelectric material to enhance the utilization efficiency of visible light, and on the other hand, the oxygen vacancy amorphous layer formed on the surface of the ferroelectric material nanoparticles is more conducive to the charge transfer between the heterojunctions, thereby stabilizing the structure of the Z-type heterojunction, thereby achieving the visible light catalytic efficient degradation of pollutants.

The invention discloses a Ru / Ce0. 3Zr0. 7O2-F catalyst for a methane catalytic combustion reaction and a preparation method of the Ru / Ce0. 3Zr0. 7O2-F catalyst. The catalyst comprises the following components in percentage by weight: 1.0 percent of Ru, 0.3 percent of Ce, 0.7 percent of Zr, 99.0 percent of O2-F. The catalyst is prepared by adopting an oxidation coprecipitation-acid etching-impregnation method. The catalyst provided by the invention can completely oxidize methane into carbon dioxide and water at a relatively low reaction temperature, so that up-to-standard emission of methane waste gas is realized, byproducts with greater pollution are not generated, and secondary pollution is avoided. The Ru / Ce0. 3Zr0. 7O2-F catalyst is prepared by adopting an oxidation coprecipitation-acid etching-impregnation method, the activity of the catalyst can be remarkably improved, meanwhile, the preparation method is simple and easy to implement, and industrialization is easy to realize.

The invention discloses a ball-milling modified graphite phase carbon nitride photocatalytic antibacterial film and a preparation method and application thereof in the field of antibacterial materials. The ball-milling modified graphite phase carbon nitride photocatalytic antibacterial film is prepared by taking graphite phase carbon nitride (g-C3N4) as an antibacterial agent and polyvinyl alcohol as a film forming substrate in a curtain coating plate coating manner. According to the invention, ball-milled and modified carbon nitride is selected as a photocatalytic antibacterial agent and is successfully loaded on the polyvinyl alcohol film, so that the photocatalytic antibacterial activity is enhanced, and the problem that a powder catalyst is difficult to apply practically is solved. The ball-milling technology and the casting plate coating film preparation process adopted by the invention are relatively simple to operate, and the prepared ball-milling modified graphite phase carbon nitride photocatalytic antibacterial film has good visible light response characteristic and excellent antibacterial performance, is safe, non-toxic, green and environment-friendly, and has wide application prospects. Wide application prospects are realized in the fields of photocatalytic sterilization, food, fruit and vegetable preservation and the like.

The invention relates to the technical field of anti-corrosion coatings, in particular to a preparation method of conductive metal anti-corrosion paint, and the prepared coating can remarkably improve the corrosion resistance of the 304 type stainless steel surface. Compared with uncoated 304SS bare steel, the corrosion potential of 304SS under the protection of the coating is obviously increased, the corrosion current density is obviously reduced, the ZIFs / GO composite material is adopted as epoxy resin coating filler, and PPY is assisted to prepare the anti-corrosion coating. The ZIFs has unique crystal structure and chemical properties, the GO has excellent barrier property and mechanical property, the PPY has good conductivity and oxidation-reduction property, the ZIFs, the GO and the PPY cooperate with one another, so that the coating has better comprehensive performance, and the ZIFs / GO composite material can enhance the binding force between the coating and a matrix and improve the barrier property of the coating at the same time; and the PPY surface layer can further improve the conductivity of the coating and is beneficial to exerting the anodic protection performance in a corrosive environment, so that the matrix metal is better protected.

The invention discloses a method for improving caproic acid production through in-situ fermentation of kitchen waste by using ferroferric oxide, and relates to the field of organic solid waste treatment and recycling, in particular to a method for promoting the efficiency of caproic acid production through anaerobic fermentation by adding a conductive accelerant ferroferric oxide. According to the method, a proper amount of ferroferric oxide is added into a fermentation system, so that hydrolysis and acidification of a substrate are accelerated, electron transfer of microorganisms is promoted, anaerobic microorganisms are enriched, the carbon chain extension process of an anaerobic system can be promoted, and production of hexanoic acid is further promoted. Fe3O4 enhances the oxidation-reduction performance by inducing Fe < 2 + > and Fe < 3 + > to circulate, so that electron transfer is facilitated, and the anaerobic fermentation acid production efficiency of the kitchen waste is better regulated and controlled. Kitchen waste is fermented under an anaerobic condition to form lactic acid which is used as an electron donor, so that external electron donor source supplementation is not needed, and the method is a more sustainable hexanoic acid biosynthesis method; and the ferroferric oxide can be recycled after magnetic separation, so that the method has remarkable development potential and application prospect.

The invention discloses an ultralow-temperature manganese-based SCR (Selective Catalytic Reduction) denitration catalyst and a preparation method thereof. The SCR catalyst comprises manganese oxide, zirconium oxide and tin oxide, in the catalyst finished product, the content of ZrO2 is 26-32 mol%, the content of SnO2 is 13-16 mol%, and the balance is MnO2 in terms of the total content of metal oxides being 100 mol%; by accurately controlling the contents of manganese oxide, zirconium oxide and tin oxide and the addition amount of cetyltrimethylammonium bromide (CTAB), the pore structure of the SCR catalyst is optimized, the activity and selectivity of the catalyst are improved, the performance of the catalyst is improved, and the catalyst can keep higher denitration efficiency under different working conditions; the conversion rate of the ultralow-temperature SCR catalyst to NO reaches 95% or above under the conditions that the reaction space velocity is 100,000 h <-1 > and the temperature is 80 DEG C, and the conversion rate is maintained at a high level for a long time.

The invention discloses preparation of a heterojunction photocatalyst and application of the heterojunction photocatalyst in treatment of uranium-containing wastewater. The preparation comprises the following steps: step 1, preparing polystyrene nanospheres; step 2, preparing PS-TiO2 (Polystyrene); and 3, adding PS-TiO2 prepared in the step 2 into ethanol, carrying out ultrasonic dispersion, adding a carbon quantum dot solution, carrying out a stirring reaction at a certain temperature for a certain time, carrying out centrifugation, washing with ethanol and deionized water to obtain a faint yellow product, and drying the faint yellow product to obtain the heterojunction photocatalyst. The heterojunction photocatalyst PS-TiO2-coated CQDs is synthesized by taking a support type material polystyrene nanosphere as a substrate, coating the surface of the substrate with a photocatalyst TiO2 and introducing carbon quantum dots to construct an S-type heterojunction coupling in-situ surface active site modification strategy, and the heterojunction photocatalyst PS-TiO2-coated CQDs shows extremely high photocatalytic activity and special selectivity to uranium, and can be applied to the field of uranium treatment. The PS-TiO2-coated CQDs show excellent ion interference resistance, chemical stability and cycle performance in a uranium-containing solution, and the photocatalytic removal rate of the PS-TiO2-coated CQDs to U (VI) is greater than 99%.

The invention discloses a preparation method of a MnOx-FeOx-titanium silicalite molecular sieve low-temperature denitration catalyst, which comprises the following steps: dropwise adding ethyl silicate into a tetrapropylammonium hydroxide aqueous solution, stirring, simultaneously dissolving tetrabutyl titanate into isopropanol, independently hydrolyzing, mixing the two solutions, and reacting at the temperature of 60-80 DEG C for 2-3 hours to obtain the MnOx-FeOx-titanium silicalite molecular sieve low-temperature denitration catalyst. Heating to remove alcohol and supplementing evaporated water in time to obtain a mixture; transferring the mixture into a reaction kettle for hydrothermal treatment, cooling to room temperature, centrifuging, washing and drying to obtain white precipitate; grinding the white precipitate, transferring to a muffle furnace, and roasting to obtain a carrier; and dissolving manganous nitrate and ferric nitrate in deionized water to form a mixed solution, immersing the carrier powder into the mixed solution, stirring, drying to obtain a solid, grinding the solid, transferring into a muffle furnace, and roasting to obtain the MnOx-FeOx-TS-1 catalyst. According to the preparation method disclosed by the invention, the Ti element is introduced into the carrier under the condition that the pore diameter structure is not changed, so that the MnOx-FeOx catalyst loaded on TS-1 shows excellent NOx conversion efficiency in a low-temperature NH3-SCR (Selective Catalytic Reduction) reaction.

This invention discloses a method and apparatus for constructing a microdroplet self-Fenton system. The construction method includes the following steps: mixing an iron salt with an acidic solution, and subjecting the resulting mixed solution to ultrasonic atomization to form micron-sized droplets, thereby obtaining the microdroplet self-Fenton system. The construction apparatus includes an atomizing reactor for storing the mixed solution and an ultrasonic generator for providing ultrasonic waves. The microdroplet self-Fenton system constructed by this invention has the following advantages: good adaptability, enabling the acquisition of a self-Fenton system under conditions of no light, no catalyst, and no sacrificial agent; it helps to increase the generation rate and yield of ·OH in the system, giving the system stronger redox capabilities and enabling efficient degradation of organic pollutants, providing important guidance for promoting the effective treatment of organic pollutant wastewater; the process is simple, easy to operate, low in cost, environmentally friendly, suitable for industrial applications, and facilitates the effective treatment of organic pollutant wastewater.

The invention discloses a preparation method of a novel AgCl / BiOCl-diatomite S-type heterostructure, the material is prepared by a two-step method, BiOCl nanosheets are loaded on diatomite through simple electrostatic self-assembly, and then AgCl and diatomite are deposited in situ through a photochemical method, so that the specific surface area of the composite material can be increased, the recoverability can be enhanced, and the preparation method is simple and easy to implement. A novel S-type heterostructure can be formed between AgCl and BiOCl, the S-type heterostructure can retain the highest redox potential of photon-generated carriers in the composite material and has very high carrier separation capacity, and compared with pure BiOCl, the novel AgCl / BiOCl-coated diatomite S-type heterostructure has the advantage that the degradation capacity on rhodamine b, tetracycline, norfloxacin and levofloxacin is greatly improved.

The application provides a denitration catalyst, a preparation method and application thereof, and the denitration catalyst comprises a layered MCM molecular sieve carrier and a composite oxide active component loaded on the surface of the layered MCM molecular sieve carrier, and the chemical formula of the composite oxide active component is CeCuO x The denitration catalyst has high surface acidity and redox capacity, the CeCuO x The alkali metal poisoning resistance of the catalyst is improved, so that the catalyst has high catalytic activity and nitrogen selectivity in the use temperature range of 250-400 DEG C after being poisoned by alkali metal.

The invention belongs to the technical field of photocatalysts and preparation thereof, and particularly relates to a Zn-Zr / ZSM-5 / SrO photocatalyst and a preparation method and application thereof. The preparation method of the Zn-Zr / ZSM-5 / SrO photocatalyst comprises the following steps: dissolving Zn (NO3) 2.6 H2O and ZrO (NO3) 2.2 H2O in absolute ethyl alcohol, then adding ZSM-5, grinding and calcining the obtained white solid, dissolving the obtained Zn and Zr doped ZSM-5 in absolute ethyl alcohol, adding Sr (NO3) 22H2O, and calcining the obtained solid to obtain the photocatalyst. The Zn-Zr / ZSM-5 / SrO photocatalyst provided by the invention has the advantages of strong photocatalytic degradation capability and stable structure. The preparation method is simple and convenient to operate. The invention further provides application of the Zn-Zr / ZSM-5 / SrO photocatalyst, and the degradation rate is high.

The invention relates to an immobilized plasma Z-type NiCuBi2O4 / Bi / NiO composite film photocatalyst as well as a preparation method and application thereof. The NiCuBi2O4 film photocatalyst is prepared by taking nickel foil as a substrate and adopting a coprecipitation method, a spin-coating method and a high-temperature calcination method. The NiCuBi2O4 / Bi thin film photocatalyst is prepared through an in-situ reduction method. And finally, preparing the plasma Z-type NiCuBi2O4 / Bi / NiO composite film photocatalyst through a sol-gel method, a spin-coating method and a high-temperature calcination method. The immobilized plasma Z-type NiCuBi2O4 / Bi / NiO composite film photocatalyst with the Ni foil as the substrate is constructed aiming at the problems of agglomeration and recovery in powder photocatalyst reaction, non-noble metal Bi nano particles are introduced to serve as conductive channels, the low-cost plasma resonance effect is achieved, the enhanced catalytic degradation activity is obtained under sunlight, and the photocatalytic degradation effect is improved. Meanwhile, the practical problem that precious metal depends on and powder catalysts are difficult to separate and recover is solved.

The invention discloses a method for enhancing the water decomposition performance of a two-dimensional gallium selenide / zirconium disulfide heterojunction based on atomic adsorption, and efficient photocatalytic water decomposition can be realized by constructing a unique atomic adsorption gallium selenide / zirconium disulfide heterojunction structure. According to the provided adsorption enhancement structure, the electronic structure and the energy gap size of the gallium selenide / zirconium disulfide heterojunction can be effectively regulated and controlled by adjusting the number of adsorbed Se atoms and Zn atoms, meanwhile, a Z-type structure is kept, and the oxidation reduction capacity of an electron hole is improved; according to the atomic adsorption enhanced gallium selenide / zirconium disulfide heterojunction, the light capturing capacity is greatly improved, the maximum light absorption coefficient in the visible light range exceeds 1 * 10 < 5 > cm <-1 >, the maximum absorption coefficient in the ultraviolet light range can reach 8 * 10 < 5 > cm <-1 >, and the maximum STH efficiency reaches 51%; se atoms and Zn atoms are adsorbed on the surface of the gallium selenide layer, so that the complete water decomposition capability of the gallium selenide / zirconium disulfide heterojunction can be improved. # imgabs0 #

The present invention relates to a TiO2 / Cs2AgBiBr6 composite catalyst and a preparation method and application thereof, belonging to the field of photocatalysis technology. The TiO2 / Cs2AgBiBr6 composite catalyst of the present invention is composed of a nano-TiO2 catalyst and a Cs2AgBiBr6 crystal, wherein the nano-TiO2 catalyst is loaded on the surface of the Cs2AgBiBr6 crystal. The invention grinds and mixes CsBr, AgBr and BiBr3 to obtain a precursor powder; spreads the precursor powder on a weighing paper, floats the weighing paper on the surface of deionized water, and gradually infiltrates the precursor powder with deionized water; during the infiltration process, the color of the precursor powder changes from light to dark, and after the color change stops, the infiltrated powder is taken out and dried to obtain Cs2AgBiBr6 crystal powder; the Cs2AgBiBr6 crystal powder and a nano-TiO2 catalyst are added to a grinding container, and the nano-TiO2 catalyst is wet-milled for 5 to 10 minutes under the condition of relative humidity>50%, and the nano-TiO2 catalyst is loaded on the surface of the Cs2AgBiBr6 crystal to obtain a TiO2 / Cs2AgBiBr6 composite catalyst. The TiO2 nanoparticles of the invention are loaded on the Cs2AgBiBr6 crystal, effectively promote the separation and transfer of photogenerated electrons, and efficiently catalyze the reduction of CO2 gas to selectively convert it into CO gas under visible light.