89results about How to "Responsive to visible light" patented technology

The invention discloses a preparation method of a composite material of Zn0.8Cd0.2S and graphene, and belongs to the technical field of preparation of the composite material of a photocatalyst. The method comprises the following steps of: taking graphene oxide as an initial bearing material, zinc acetate dehydrate and cadmium acetate dehydrate as precursors for preparing Zn0.8Cd0.2S nano particles, and dimethyl sulfoxide as a sulphur source and a reducing agent; and achieving preparation of the Zn0.8Cd0.2S, reduction of the graphite oxide and composition of the Zn0.8Cd0.2S/graphene in one step by adopting a solvent thermal technology, so as to prepare the composite photocatalyst with visible light response. The composite material disclosed by the invention is simple and convenient in preparation method; the composite material of the Zn0.8Cd0.2S/graphene can be synthesized in one step; meanwhile, the graphene oxide is effectively reduced into the graphene; the product Zn0.8Cd0.2S particles are small and evenly distributed on the graphene, and display wide visible light response and high photocatalytic activity; and the degradation rate on methylthionine chloride under the optimal condition achieves 96%.

The invention relates to a preparation method of semiconductor composite antibacterial photocatalyst containing nitrogen-doped titanium dioxide and zinc titanate, and belongs to the technical field of the treatment of environmental pollution. The semiconductor composite antibacterial photocatalyst is prepared a uniform coprecipitation method which comprises the following steps of: preparing a mixed solution in the amount-of-substance ratio of titanium sulfate to urea to zinc ions of 1:10:0; continuously mixing the mixed solution; raising the temperature of a water bath to 60 DEG C; adding a surfactant (sodium dodecyl benzene sulfonate) into the mixed solution based on the concentration of 20mg/150ml; keeping a constant temperature for 0.5h; raising the temperature to 90-100 DEG C again; keeping the temperature for 3-6h; adding ammonia water into the solution to regulate to pH (potential of hydrogen) to be 6-8; washing and drying the obtained product; and forging the product at the temperature of 400-800 DEG C. The preparation method has the advantages of short process flow, simple equipment, simple and convenient operation, and low price of raw materials. The prepared semiconductor composite has the advantages of having good dispersibility, visible spectral response and low energy consumption, and is an environment-friendly antibacterial purification material.

The invention discloses a preparation method of a metal-organic framework material photocatalyst. The method comprises the following steps: 1. dissolving an organic-ligand in N,N-dimethyl formamide, and stirring to obtain a clear and transparent solution; 2. adding ferric chloride, and stirring to obtain a mixed solution; 3. adding an ethanol solution, mixing evenly, transferring to a reaction kettle, putting the reaction kettle into a microwave digestion instrument, reacting at 80-130 DEG C for 20-50 minutes, and removing a supernatant liquid after reacting, so as to obtain a solid product; 4. washing the solid product with an N,N-dimethyl sulfoxide-ethanol mixed solvent, filtering and drying, so as to obtain an MOF235 photocatalyst. According to the photocatalyst disclosed by the invention, organic pollutants in the wastewater can be efficiently degraded; the preparation method is simple, efficient, and low in energy consumption; and the prepared MOF235 photocatalyst is relatively high in degradation rate.

The invention relates to a low-temperature preparation method of a copper sulfide (CuS)/titanium oxide (TiO2) hetero-junction photocatalyst. The method comprises the steps of (1) preparing titanium hydroxide (Ti(OH)4) by using an inorganic salt or an organic salt of titanium as a precursor and adopting a precipitation method or a sol-gel method; (2) roasting Ti(OH)4 at the temperature of 400-650 DEG C for 2-4h to obtain a TiO2 carrier; (3) dispersing copper powder and sulfur powder into a specific solvent, soaking the TiO2 carrier into the solvent, performing magnetic stirring, and heating for 4-24h in a water bath of 40-60 DEG C, wherein CuS generated by the copper powder and the sulfur powder can be loaded to the TiO2 carrier in the process; and (4) cooling the CuS/TiO2 sample to room temperature, and filtering, washing and drying the sample to obtain the CuS/TiO2 hetero-junction photocatalyst.

The invention discloses a method for preparing a g-C3N4 hollow fiber film on a large scale. The method includes the following steps of putting melamine or urea or a mixture of melamine and urea in a muffle furnace, firing the material at a temperature of 450-600 DEG C for 1-4 hours to obtain yellow g-C3N4 blocks, evenly grinding the yellow g-C3N4 blocks to form g-C3N4 powder, putting the g-C3N4 powder in the muffle furnace, firing the g-C3N4 powder at a temperature of 400-700 DEG C for 1-4 hours to obtain g-C3N4 nanometer sheets, dispersing the g-C3N4 nanometer sheets and polymers in organic solvent to prepare a casting membrane solution, and spinning the casting membrane solution (as a shell solution) and water (as a core solution) in a coagulating bath at the same time through a spinning head of a spinning machine to obtain the g-C3N4 hollow fiber film, wherein the mass ratio of g-C3N4 nanometer sheets to polymer to organic solvent is 1:(0.2-1):(4-10) and the ratio of shell solution flow speed to core solution flow speed is (0.5-5):1.

The invention discloses a preparation method of metastable phase bismuth oxide and application thereof in photocatalytic degradation of organic pollutants. The preparation method comprises the following steps: carrying out hydrothermal reaction on an aqueous solution which contains ammonium bismuth citrate, urea and hexadecyl trimethyl ammonium bromide to obtain bismuthyl carbonate microflowers; and calcining the bismuthyl carbonate microflowers in an air environment to obtain the metastable phase bismuth oxide beta-Bi2O3/Bi2O2.33@Bi2O2CO3. The preparation method is simple and controllable to operate, and is environmentally friendly. The synthesized metastable phase bismuth oxide has the advantages of visible-light response, large specific surface area, high catalytic activity and the like, has the characteristics of rapidness and high efficiency in a process of visible-light catalytic degradation of the organic pollutants, and can be widely applied to the technical field of treatment of the organic pollutants.

The invention discloses a compound type semiconductor photocatalyst based on graphene, CdS nano crystal and cheap metal and a preparation method of the compound type semiconductor photocatalyst as well as a photocatalytic system and a method for preparing hydrogen. According to the compound type semiconductor photocatalyst, a cheap inorganic salt is used as a precursor in the presence of a biomass and a derivative thereof and cobalt, nickel, iron or manganese metal is loaded on a graphene-CdS compound in situ by a photic driving method to prepare the ternary compound type semiconductor photocatalyst based on the graphene, the CdS nano crystal and the cheap metal; meanwhile, the biomass and the derivative of the biomass are reformed to generate the hydrogen. The compound catalyst loaded with the cheap metal is prepared by adopting an in-situ illumination method and the catalytic hydrogen production efficiency is obviously improved; the graphene is introduced so that the catalyst is efficient. The catalytic system has the advantages of visible light response, simple equipment and convenience in operation; the catalyst is stable and cheap; a preparation process does not need to take noble metal materials including platinum, rhodium and the like as catalyst promoters.

The invention discloses a heterojunction-embedded photocatalyst with one-dimensional doping TiO2 and a preparation method and an application thereof. The catalyst has a one-dimensional structure, which contains TiO2/SnO2 heterojunction structure, or TiO2/ZnO heterojunction structure, or TiO2/SnO2 heterojunction structure and TiO2/ZnO heterojunction structure by modification with nonmetal doping. The required catalyst is prepared by chemical deposition method under the condition that crystal growth catalyst exists by alternate switching gas sources such as different precursors, impurity gas, etc. to realize the alternate growth of different semiconductors, which has higher photocatalysis degradation capacity of indoor contamination under ultraviolet light and visible light.

The invention belongs to the field of photocatalytic materials, and particularly relates to a monatomic noble metal anchoring defect type WO3/TiO2 nanotube as well as preparation and application thereof. WO3 particle loaded TiO2 nanotubes are modified by adopting electrochemical reduction, and are subjected to electrochemical treatment to further load monatomic noble metals, so that the electron transport capacity and hole electron pair composite performance of the WO3 particle loaded TiO2 nanotubes are improved, and the photocatalytic performance of the WO3 particle loaded TiO2 nanotubes is improved. Oxygen vacancies on the surfaces of WO3 particles stabilize the monatomic noble metals, the noble metals are prevented from being agglomerated and inactivated, and the material is applied tophotocatalytic degradation of indoor volatile organic compounds and has higher degradation efficiency and stability.

The invention discloses a nitrogen defect-containing hollow tubular graphite phase carbon nitride photocatalyst, a preparation method and applications thereof. The preparation method comprises: carrying out a hydrothermal reaction by using melamine as a raw material, then adding KOH, and carrying out high-temperature calcination. According to the invention, the one-dimensional morphology of the catalyst is of a hollow tubular structure containing nitrogen vacancies, the diameter is 3-7 microns, and the length is 20-50 microns; the nitrogen vacancy is a defect and is introduced by adding potassium hydroxide in the calcining process; and the catalyst provided by the invention has the advantages that the photocatalytic performance is high, and the catalyst can be effectively applied to removal of antibiotics in wastewater.

The invention discloses a terephthalic acid uranyl coordination compound photocatalyst and a preparation method thereof, wherein the molecular formula of the photocatalyst is (H2-4,4'-bpy)[(UO2)2(TPA)3][4,4'-bpy=4,4'-bipyridine, TPA=terephthalic acid], the photocatalyst is yellow powder capable of being screened with a 100-mesh sieve and having a purity of not less than 99%, belongs to a tetragonal system, and has a p4<->21c space group structure, and the crystal cell parameters comprise that a is 23.203(3)angstrom, b is 23.203(3)angstrom, and c is 20.222(4)angstrom. According to the present invention, under the irradiation of an xenon lamp light source capable of simulating sunlight, with the photocatalyst, the RhB solution with the concentration of 20 mg/L can be degraded to 28.6% within 105 min; compared to the traditional TiO2, the photocatalyst of the present invention has the advantage of visible light response, and is the photocatalyst having good photocatalysis performance; and the preparation method has advantages of simple and easy-performing process, low requirements on equipment, and the like.

The invention relates to a phosphorylation modification-based photocatalytic material and preparation and application methods thereof. The phosphorylation modification-based photocatalytic material isphosphorylated LaFeO3, in which La3+ serves as of forming sites of phosphate radicals. The phosphorylation modification-based photocatalytic material can be applied to nitrogen fixed ammonia synthesis.

The invention relates to a method for preparing a Lewis acidic molecular imprinting type BiOI photo-catalyst with visible-light response and high selectivity by a hydrothermal method. The method comprises the steps of: preassembling Bi<3+> with template molecules by interaction of Lewis acid and alkaline and an electrostatic effect; obtaining a BiOI framework combined with the template molecules in stirring and hydrothermal processes at normal temperature; then with a mixed solution of methanol and hydrochloric acid (of which the volume ratio is 1:1) as an eluant, and removing the template molecules by a Soxhlet extraction method to finally obtain the Lewis acidic molecular imprinting type BiOI photo-catalyst with visible-light response and high selectivity. The method has the remarkable advantages that the preparation conditions are mild; the Lewis acidic molecular imprinting type BiOI photo-catalyst has visible-light response and high mechanical strength; the molecular recognition site is not easy to be damaged; and the photo-catalyst has good selectivity and high degradation efficiency to target organic pollutants, can remarkably reduce the concentration of the target pollutants in landscape recycled water, and simultaneously farthest retains the organic nutritional ingredient in water.

The invention relates to a thulium doped titanium sol and a method for degrading textile organic dirt under visible light, wherein the method comprises the following steps of: doping lanthanide thulium by using tetrabutyl titanate as a precursor and adopting a sol-gel method to prepare the thulium doped titanium sol, shaking the thulium doped titanium sol in a shaking bath pot for a certain period of time, placing at room temperature and ageing; enabling the sol to be adsorbed onto fibers by adopting an immersion method, drying and baking to enable the thulium doped titanium sol to form a film on the surface of textile fibers. The thulium doped titanium dioxide sol has simple preparation method, low-temperature operation and visible light response; the consolidated textile can decompose the organic dirt covered on the consolidated textile under the visible light, and the degradation ratio can reach more than 90 percent.

The invention discloses a porous catalyst used for photo-electrolysis water oxygen evolution reaction, which belongs to the technical field of oxygen evolution photo-electrolysis porous catalysts, and also provides a preparation method of the porous catalyst. The porous catalyst used for photo-electrolysis water oxygen evolution reaction has amorphous or crystallization characteristic, has the chemical formula of K(CoxNi[1-x])PO4, wherein x is equal to 0-1, and the structure of the porous catalyst has a plurality of crystal water molecules. The porous catalyst is prepared by using a two-stage precipitation method. The porous catalyst and the preparation method have the following advantages that the oxygen evolution reaction electrode catalysts and the composite electrodes with excellent performance are prepared by cheap raw materials and simple steps, thus the expensive Ir and Ru series compounds are not required.

The present invention discloses a co-catalyst for preparing hydrogen through photocatalytic decomposition of formic acid, and relates to the field of photocatalysis, wherein the co-catalyst is the mixture comprising one or more than two materials selected from CoPx, FePy, Ni2P and NiPz, x is more than 1 and is less than or equal to 4, y is more than 1 and is less than or equal to 4, z is more than 1 and is less than or equal to 4, and the co-catalyst is used for the preparation of hydrogen through photocatalytic decomposition of formic acid. The invention further discloses a photocatalytic system containing the co-catalyst, wherein the photocatalytic system comprises an organic semiconductor, the co-catalyst, a reaction substrate, and water. According to the present invention, the photocatalytic system completely uses the low-cost elements so as to provide the low cost, the addition of the organic solvent in the reaction is not required, the reaction is performed at the room temperature, and the method has advantages of visible light response, good catalytic system selectivity, high stability, and easy practical application.

The invention provides a nonmetal doped titanium-based film electrode as well as a preparation method and an application thereof and belongs to the photoelectric catalysis technical field of inorganic nonmetal materials. The preparation method comprises the following steps of: mixing and reacting an elementary substance or compound of a nonmetal element with titanium isopropoxide to prepare nonmetal doped TiO2 particles; preparing TiO2 nanocrystals; mixing the nonmetal doped TiO2 particles and a pore-forming agent with the TiO2 nanocrystal emulsion to prepare latex and coating; and then carrying out thermal treatment. The nonmetal doped titanium-based film electrode prepared by using the method is used for photoelectrocatalysis degradation of pollutants in water, such as paint, phenols, aldehydes, medicaments or heavy metal ions. The electrode provided by the invention has the advantages of visible light response, large specific surface area and strong adhesive power with a substrate.

The invention discloses a preparation method of a petal-shaped ZnIn2S4-loaded bismuth oxide composite visible light catalytic material, which comprises the following steps: synthesizing Bi2O3 by taking Bi-MOF as a precursor, and synthesizing ZnIn2S4 by adopting a hydrothermal method; and then taking Bi2O3 and ZnIn2S4 as raw materials, and synthesizing by adopting a hydrothermal method to obtain the petal-shaped ZnIn2S4 loaded bismuth oxide composite visible light catalytic material. In addition, the invention also discloses a product prepared by the preparation method. The prepared bismuth oxide composite visible light catalytic material is of a rod-shaped structure, ZnIn2S4 of a petal-shaped structure is evenly dispersed on the surface of the rod-shaped bismuth oxide structure, the specific surface area of the material is effectively increased, more active sites are exposed, and therefore the bismuth oxide composite visible light catalytic material has the excellent hydrogen production performance, can rapidly and efficiently conduct photolysis on water to produce hydrogen, and has the wide application prospect. And reliable theoretical and practical support is provided for practical application.

The invention relates to a method for efficiently removing organic pollutants in wastewater by combining visible light catalyst-ClO2 oxidation. The which comprises the following steps of: (1) regulating the pH value of wastewater containing organic matters to a constant pH value, adding a visible light response catalyst, putting an obtained mixture in a dark place, and performing sufficient stirring and adsorbing until adsorption equilibrium is reached; and (2) turning on a xenon lamp light source, adjusting the distance between the light source and the liquid level, adding chlorate into a system, keeping the reaction temperature constant, and performing fully stirring to degrade the organic pollutants. According to the method, the organic pollutants in the wastewater are removed by adopting the visible light catalyst-ClO2 oxidation combined process; an active substance generated in a photocatalysis process is used as an oxidizing agent, the active substance and chlorate-containing acid radicals are subjected to electron transfer, so that chlorine-containing active substances such as ClO2 and the like are generated, and such that the organic pollutants can be continuously subjectedto oxidative degradation, oxidation ability is strong, lasting time is long, the problems of short service life, short mass transfer distance and the like of photo-produced active substances during aphotocatalysis process are avoided, and the degradation rate of the pollutants is effectively improved.

The invention relates to a Pt modified Fe2O3 coated CuFeO2 photocathode which comprises a Pt catalyst particle layer, a Fe2O3 coated CuFeO2 particle film layer and an ITO conducting glass substrate layer by layer downward from the surface, wherein Fe2O3 and CuFeO2 in the Fe2O3 coated CuFeO2 particle film layer form a coating structure; Fe2O3 on the surface forms a transitional layer between FeO2 and the Pt catalyst particle layer, an upwarp barrier at the interface is eliminated, and the photo current density and the hydrogen production efficiency of the photocathode are improved. The Pt modified Fe2O3 coated CuFeO2 photocathode and a preparation method overcome the defects that the preparation temperature of an existing CuFeO2 film photoelectrode is high, the conductivity and transparencyof the ITO conducting glass substrate layer are easily damaged and the upwarp barrier is easily formed between CuFeO2 and the Pt catalyst particle layer, and has the characteristics of being good instability, visible-light responsive, large in photo current density, high in turn-on voltage and the like.

The invention relates to a preparation method of a fluorine and carbon co-doped nano-titanium dioxide visible light photocatalyst, comprising the following steps of: dropping an anhydrous alcohol solution of tetrabutyl titanate into an ammonium fluoride water solution and ethylene diamine by mixing; hydrolyzing by mixing at room temperature, wherein a mol ratio of fluorine to titanium is 0.05:1-0.2:1, and a mol ratio of the ethylene diamine to the tetrabutyl titanate is 0.16:1-0.48:1; obtaining collosol; obtaining flaxen gel by drying the collosol; and obtaining the fluorine and carbon co-doped nano-titanium dioxide photocatalyst by calcining the gel. In the preparation method, the reaction condition is mild and is easy to control, devices are simple, raw materials are easy to purchase, and a synthetic process is simple and is easy to industrially produce; the prepared fluorine and carbon co-doped nano-titanium dioxide photocatalyst has high specific surface, pure crystalling phase, more surface acid sites and visible light response.