67results about How to "Favorable for photocatalytic reactions" patented technology

The invention discloses a calculation method for improving the photocatalytic properties of the ZnO (0001) surface through Fe atom doping and adsorption. The method includes the steps of constructingthe primitive cells of ZnO body material in MS software, optimizing the structure, and constructing ZnO (0001) surface supercells and doping and adsorption models of Fe atoms at different loci on thepure ZnO (0001) surface; conducting structural optimization and GGA+U method calculation on the surface, selecting the energy band structure, the state density, the optical properties and the accuracycorresponding separately, and conducting calculation on each model; analyzing each model through a CASTEP module, obtaining the formation energy, optical property constant and work function of the ZnO (0001) surface doped and adsorbed by the Fe atoms, and obtaining the electronic structure and the optical property corresponding to each model. Therefore, the photocatalytic activity of the ZnO (0001) surface in the visible light range is improved, and certain reference is provided for the practical application of ZnO photocatalysis.

The invention discloses a composite film with photocatalytic oxidability and a preparation method thereof. The preparation method comprises the following steps: preparing titanium dioxide/carbon nanotube powder through glue melting and condensation, and uniformly dispersing the titanium dioxide/carbon nanotube composite material into acetic acid solution of chitosan with the chitosan as a crosslinking agent, wherein the mass ratio of the chitosan and the titanium dioxide/carbon nanotube is 1 to 10, thereby obtaining the catalytic film made of titanium dioxide/carbon nanotube/chitosan material. The composite film prepared in the method is uniform, the preparation method is simple, the raw materials are cheap, and the sources are rich. The defect structure of the surface of the raw carbon nanotube provides growing points for the growth of titanium dioxide grains. In addition, the adsorbed organic substances and intermediates of photodegradation have the function of coordinating with functional groups of the chitosan. The composite catalytic film provided by the invention can be used for photocatalytic oxidation of volatile organic compounds (VOCs) under the visible light irradiation with the wavelength more than 350nm, and can be used as the air purification agent, the industrial waste water treatment agent and the like.

The invention relates to a technology for treating inorganic fluorine-organic fluorine industrial waste water. The technology comprises the following steps: introducing air into inorganic fluorine-organic fluorine industrial waste water with the inorganic fluorine content of more than 5000mg/L, so as to blow off volatile matters; if the waste water in which volatile matters are removed is low-turbidity waste water, directly carrying out UV-Fe<3+>/Fe<3+> hydrogen peroxide system oxidation defluorination; if the waste water in which volatile matters are removed is high-turbidity waste water, descending the turbid of the high-turbidity waste water to obtain low-turbidity waste water, and then carrying out UV-Fe<3+>/Fe<3+> hydrogen peroxide system oxidation defluorination; and carrying out Fe<3+>-lime-pulverized fuel ash defluorination on the waste water which is subjected to the UV-Fe<3+>/Fe<3+> hydrogen peroxide system oxidation defluorination. The technology is applicable to treatment of organic fluorine industrial waste water with high acidity and high inorganic fluorine content (F- is more than 5000mg/L); the purpose of simultaneously removing organic fluorine and inorganic fluorine pollutants is achieved by combining the organic fluorine degradation and inorganic fluorine removal.

The invention discloses a preparation method for a feather-keratin-modified cadmium sulfide photocatalyst. The preparation method comprises the following steps: dispersing feather keratin into a urea aqueous solution, and performing water bath to obtain a completely soluble feather keratin solution; adding dithiothreitol, stirring for reducing for a certain time, then adding Cd(Ac)2.2H2O solution and an Na2S solution in sequence under stirring, and performing ultrasonic processing; then, performing water bath on the mixed solution for 6-8 hours at 80-100 DEG C; and finally, washing with distilled water and absolute ethyl alcohol, and drying to obtain the feather-keratin-modified cadmium sulfide photocatalyst. According to the photocatalytic degradation experimental results, the feather-keratin-modified cadmium sulfide photocatalyst prepared by the preparation method has relatively good photocatalysis performances in comparison with single cadmium sulfide, and has a wide application prospect in photocatalytic degradation of organic pollutants.

The invention relates to a preparation method for forming single-layer high-activity (001) crystal surface dominating titanium dioxide thin films on different substrates, in particular to the method for growing the (001) crystal surface dominating titanium dioxide thin film consisting of single-layer titanium dioxide particles on a metallic titanium or titanium alloy substrate by a wet chemical process, which solves the problems that (001) dominating titanium dioxide powder difficultly forms a (001) plane totally positioned on a surface and that a compact thin film is difficult to form. In the method, the substrate is placed into a reaction kettle containing the aqueous solution of hydrofluoric acid, and heating treatment is performed at 100 to 200 DEG C for 6 to 24 h to obtain the single-layer (001) crystal surface dominating titanium dioxide thin film. The single-layer (001) crystal surface dominating titanium dioxide thin film consists of anatase and rutile in the radio of 95:5 to 80:20, has the thickness of 10 to 1,000 nm, the controllable (001) crystal surface ratio of 20 to 91 percent and high photoelectrochemical decomposition of water, and is expected to be widely and effectively applied to photocatalytic devices.

The invention discloses method for manufacturing a three-dimensional titanium dioxide photocatalytic material from an additive and belongs to the field of environment function material preparation andapplication. The method for manufacturing the three-dimensional titanium dioxide photocatalytic material from the additive comprises the following steps: selecting TiO2 granules of a certain granulesize and a resin material, preparing TiO2 composite photocatalytic resin powder by using a method of solvent precipitation or mechanical mixing, and carrying out laser area selection sintering so as to form and prepare a ceramic blank; or preparing TiO2 composite photocatalytic resin slurry by using a mechanical mixing method, and preparing the ceramic blank by using a photocuring technique; and carrying out glue removal and calcining on the prepared ceramic blank, thereby obtaining a three-dimensional TiO2 phootcatalytic material. The three-dimensional TiO2 phootcatalytic material is preparedby using an additive manufacturing technique, three-dimensional TiO2 phootcatalytic materials of complex structures can be designed and manufactured according to practical use requirements of materials, and the prepared three-dimensional TiO2 phootcatalytic material has the advantages of being large in specific surface area and high in photocatalysis efficiency.

The invention provides a carbon nitride-carbon-TiO2-selenium nano composite material applied to photocatalytic degradation of pollutants. According to the invention, an azide-modified nano-carbon nitride-nano-titanium dioxide composite material is covalently chelated to the surface of an alkynylation-modified multi-walled carbon nanotube-nano selenium composite material to obtain a carbon nitride-carbon-TiO2-selenium nano composite material. The material can be applied to photocatalytic degradation of pollutants and has excellent photocatalytic degradation properties for the pollutants.

The invention relates to a photocatalytic aerated disinfecting and fertilizer supplementing device which comprises a micro-nano bubble generating device, a photocatalytic disinfection device, a nitration reaction device, a regulating reservoir and an aerator, wherein the micro-nano bubble generating device is communicated with the aerator; the outlet of the photocatalytic disinfection device is communicated with the inlet of the regulating reservoir; the outlet of the photocatalytic disinfection device is communicated with the inlet of the nitration reaction device; and the outlet of the nitration reaction device is communicated with the inlet of the regulating reservoir. According to the device disclosed by the invention, air can be rapidly dispersed in a liquid phase in a micro-nano bubble form, the dissolved oxygen value in a water body is improved, the conversion efficiency of a subsequent nitration reaction is improved, growth of the plant root system can be promoted, and particularly for hydroponic plants in soilless culture, the root rot phenomenon caused by oxygen lack of the root system can be avoided.

The invention discloses an indium zinc sulfide nanosheet/tubular tin oxide heterojunction and a preparation method thereof, and application of the indium zinc sulfide nanosheet/tubular tin oxide heterojunction in degradation and removal of water pollutants. According to the method, tin oxide nanotubes are prepared through an electrostatic spinning technology and a high-temperature calcination technology; and tin oxide serves as a substrate, and indium zinc sulfide nanosheets evenly grow on the surface of the substrate through an oil bath so as to construct the indium zinc sulfide nanosheet/tubular tin oxide heterojunction. Indium zinc sulfide is an important metal sulfide, has a band gap width of 2.6 to 2.7 eV and is a good semiconductor material, so the prepared indium zinc sulfide nanosheet/tubular tin oxide heterojunction has a large specific surface area, can provide more adsorption sites and catalytic active sites, effectively improves the separation efficiency of photo-induced electrons and holes, further improves the activity of a photocatalytic reaction, and can be better used for photocatalytic separation and degradation of water pollutants.

The invention relates to the field of hydrogen production by photocatalytic decomposition of water, and provides a general synthesis method of three-dimensional network tantalum pentoxide (Ta2O5). The morphology of the photocatalyst is modified, so that the specific surface area of the catalyst is increased, the carrier migration distance is shortened, the hydrogen production efficiency is improved, the problems of high carrier recombination rate and few reaction active sites of a Ta2O5 photocatalytic semiconductor are solved, and the photocatalytic hydrogen production efficiency is greatly improved. The specific preparation method comprises the following steps of: dissolving TaCl5 in an absolute ethyl alcohol solution, stirring to accelerate dissolution, filtering out impurities, then adding a proper amount of a polymethyl methacrylate (PMMA) pellet template agent, and carrying out immersion and suction filtration to obtain PMMA with tantalum ethoxide in gaps; and then placing the PMMA in a tubular furnace, curing the structure in a nitrogen atmosphere, and then placing the product in a muffle furnace for secondary calcination to remove the template agent. Ta2O5 prepared by the method has a highly ordered network structure, and can efficiently decompose water to produce hydrogen.

The invention discloses a preparation method of a high-performance nano W0.4Mo0.6O3 photocatalyst. The preparation method comprises the following steps: uniformly mixing a C6H12O6.H2O aqueous solution, a Na2WO4.2H2O aqueous solution and a Na2MoO4.2H2O aqueous solution to obtain a solution mixture, adding a polyoxyethylene alcohol ether aqueous solution into the solution mixture, uniformly stirring, regulating the pH value to 1-2, performing hydrothermal reaction at 120-180 DEG C for 5-15 hours, performing aftertreatment to obtain powder, and removing carbon from the powder, thereby obtaining the high-performance nano W0.4Mo0.6O3 photocatalyst. The nano W0.4Mo0.6O3 photocatalyst has a nano granule structure, and has large specific surface area, so that the contact area between the photocatalyst and organic dye is enlarged, and photo-catalytic reaction is facilitated. The preparation method is simple and convenient, and is easy to implement.

The invention relates to a method for carrying out photocatalytic degradation on sulfamethoxazole. The problem of waste water treatment of the sulfamethoxazole hard to biodegraded can be effectively solved. The method comprises the steps that elements of iron, molybdenum and bismuth are adopted to be doped with expanded graphite to prepare a Fe/Bi/Mo-expanded graphite composite nano material, the Fe/Bi/Mo-expanded graphite composite nano material is added to waste water with the sulfamethoxazole, the pH value is adjusted to be 5.5-8.5 through alkaline matter, irradiation is carried out under visible light for 170 minutes to 190 minutes, the Fe/Bi/Mo-expanded graphite composite nano material is utilized, the waste water with the sulfamethoxazole with the concentration of 5 mg/L to 10 mg/L is directly oxidized through the single Fe/Bi/Mo-expanded graphite composite nano material without adding other promoters, and the adding amount of the Fe/Bi/Mo-expanded graphite composite nano material is 1 g/L to 2 g/L; finally, the degradation rate of the sulfamethoxazole is measured. Acidic materials do not need to be added manually, the solution of the sulfamethoxazole is acidic, a photocatalytic reaction can be carried out conveniently, after the photocatalytic reaction, the sulfamethoxazole is degraded, even part of the sulfamethoxazole is mineralized, the removal rate of the sulfamethoxazole is more than 90 percent, energy conservation and environmental protection are achieved, and great economic and social benefits are achieved.

The invention discloses an advanced treatment method for electroplating wastewater. The advanced treatment method comprises the following steps: step 1, pretreatment; step 2, coagulating sedimentation; step 3, electrochemical-photocatalysis-ozone synergistic treatment; step 4, treatment by a cation exchange resin column; step 5, treatment in a biological aerated filter; and step 6, nanofiltrationand reverse osmosis treatment. The process steps are matched with one another, the layout is compact, the floor area is small, and the energy consumption is low. Oil is removed through pretreatment, suspended matters, cyanides and colloids are removed through coagulating sedimentation, nitrogen and phosphorus can be removed through electrochemical-photocatalysis-ozone synergy, organic contaminantsare thoroughly removed, most heavy metal ions are removed through treatment by the cation exchange resin column, the biological aerated filter is capable of remarkably improving water quality, reducing the workload of a subsequent membrane system and removing residual trace organic pollutants and heavy metal ions, and finally desalination is carried out by virtue of nanofiltration and a two-stagereverse osmosis system, so that the effluent quality meets the electroplating wastewater discharge standard GB21900-2008.

The invention discloses a preparation method and application of a carbon nano onion/titanium dioxide/silicon dioxide (CNOs/TiO2/SiO2) composite photocatalytic material. The method uses titanium tetraisopropoxide (C12H28O4Ti) as a titanium source, purified carbon nano onions (CNOs) as a carbon source, and ethyl orthosilicate (C8H20O4Si) as a silicon precursor to prepare the CNOs/TiO2/SiO2 compositephotocatalytic material through a sol-gel method. According to the method disclosed by the invention, active components of the photocatalytic material obtained by the method are not easy to fall offand have high stability; the obtained composite catalyst has a large specific surface area, and an obviously-improved adsorption effect on pollutants; introduction of the CNOs greatly inhibits TiO2 photogenerated electron-hole compounding, and improves catalytic activity; and the photocatalytic material effectively solves the two bottleneck difficult problems of a low quantum yield and a poor adsorption effect in a photocatalysis technology.

The invention discloses a preparation method and application of a bismuth oxyiodate/bismuth oxybromide composite photocatalyst, and belongs to the field of photocatalytic semiconductor materials. Themethod comprises the following steps: dissolving bismuth nitrate in distilled water, dissolving potassium iodate in the solution, transferring the obtained suspension into a reaction kettle, reactingat 130-150 DEG C for 5-8 hours, naturally cooling to room temperature, and washing, drying and baking the obtained product to obtain bismuth oxyiodate; then, dissolving bismuth nitrate and hexadecyl trimethyl ammonium bromide in distilled water, transferring the obtained suspension into the reaction kettle, reacting for 18-24 hours at 140-160 DEG C, naturally cooling at room temperature, washing the product with distilled water and absolute ethyl alcohol alternately, and performing drying to obtain bismuth oxybromide; finally, respectively adding bismuth oxyiodate and bismuth oxybromide into ethanol, carrying out ultrasonic treatment, dropwise adding the bismuth oxyiodate solution into the bismuth oxybromide solution, continuing ultrasonic treatment, dropwise adding acetone into the mixedsolution, and carrying out magnetic stirring, precipitation and drying to obtain the composite photocatalyst.

The invention aims to provide a preparation method of a high-activity hollow composite photocatalyst Ag/Au/AgCl. The method comprises the following steps: firstly, 1D Ag nanowires with uniform morphology and good performance are prepared with a hydrothermal method; then the Ag nanowires are coated with AgCl particles through galvanic replacement, and an Au/Ag alloy is formed synchronously; finally, morphology and performance of an Ag/Au/AgCl hollow composite structure are controlled by controlling concentration of chloroauric acid and regulating redox reaction rate, and the high-activity hollow composite photocatalyst Ag/Au/AgCl is obtained. The efficient composite photocatalyst based on Au and Ag is prepared with the method, composition of a semiconductor and precious metal is realized, and the method is conducted under quite mild conditions, reaction time is short, operation is simple and convenient, and the method can be applied to preparation and application of various nanocomposites.

The invention discloses bamboo charcoal memory foam and a preparation method thereof, belonging to the technical field of memory foam materials. According to main points of a technical scheme, the bamboo charcoal memory foam is prepared from the following raw materials in parts by weight: 20-30 parts of polyoxyethylene triol, 8 to 12 parts of polyether polyol, 10 to 15 parts of toluene diisocynate, 1-1.5 parts of a pore opening agent, 0.2 to 0.4 part of silicone oil, 0.002 to 0.005 part of stannous octoate, 5-8 parts of bamboo charcoal powder and 6-10 parts of bamboo charcoal fibers. The bamboo charcoal memory foam has the advantage of capability of purifying indoor harmful gas.

The invention discloses a preparation method of TiO2 hollow spheres. The preparation method comprises the following steps: (1) dissolving ethylene glycol into acetone to obtain a solution A; (2) adding particle size controllable mesoporous carbon spheres into the solution A, and carrying out uniform ultrasonic dispersion to obtain a suspension B; (3) adding tetrabutyl titanate into the suspensionB, and carrying out uniform ultrasonic dispersion to obtain a suspension C; (4) transferring the suspension C into a magnetically stirred hydrothermal reactor, and subjecting a reactant to a solvothermal reaction under magnetic stirring to generate a solvothermal product D; (5) carrying out centrifugal separation, washing, drying and grinding on the solvothermal product D to obtain mesoporous carbon @ TiO2 core-shell spheres; and (6) roasting the mesoporous carbon @ TiO2 core-shell spheres at an air atmosphere to obtain the TiO2 hollow spheres. The TiO2 hollow spheres with different cavity sizes and thicknesses are prepared by changing the kind and proportion of the reactant and regulating the cavity sizes and thicknesses of the TiO2 hollow spheres, the method is simple and easy, and the product has relatively strong light absorption capacity and catalytic effect.