33results about How to "Visible light response ability is strong" patented technology

The invention discloses an organic solvent-water heating method for preparing football-shaped mesoporous BiVO4, comprising the following experimental steps: under the condition of stirring, bismuth nitrate and ammonium metavanadate are dissolved in a mixed solution of ethanol, ethylene glycol, nitric acid and laurylamine (oleylamine or mixed liquid of oleylamine and oleic acid); a sodium hydroxide (2mol / L) alcohol solution of ethanol and ethylene glycol with the volume ratio of 1 to 1 is used to regulate the pH of the solution to be equal to 1.5-3; the mixed solution is transferred in a stainless steel self-pressing vessel (the volume filling degree is about 70%) with a Teflon inner liner and is put in an incubator to carry out organic solvent - water heating treatment for 12h in constant temperature of 100 DEG C; and the mixed solution is naturally cooled to room temperature after taking out. The obtained product after the organic solvent - water heating treatment is filtered, is washed with deionized water and absolute ethanol and is dried for 12h at the temperature of 60 DEG C, and then football-shaped mesoporous BiVO4 micron particles with a monoclinic scheelite structure isobtained. The porous bismuth vanadate obtained by the method has good application prospects in the fields of photocatalysis, electrode materials, pigments, ion conductive ceramic, and the like.

The invention relates to the field of semi-conducting materials and provides a preparation method of an InVO4 / g-C3N4 composite material. The preparation method comprises the following steps of dropwisely adding a H2SO4 aqueous solution into a melamine aqueous solution to obtain a white fluid suspension, carrying out stirring at a temperature of 80 DEG C for 2h to obtain precipitates, filtering the precipitates, washing the precipitates by distilled water and anhydrous ethanol, carrying out drying to obtain melamine sulphate, acquiring g-C3N4 particles, dispersing the g-C3N4 particles into anhydrous ethanol to obtain a dispersed system, dropwisely adding an ammonium metavanadate aqueous solution into the mixed solution to obtain a yellow clear solution, carrying out stirring to obtain precipitates, carrying out filtration and washing on the precipitates, adding a surfactant into the precipitates, carrying out a hydrothermal reaction process, and filtering the produced precipitates to obtain the InVO4 / g-C3N4 composite material. The preparation method realizes InVO4 nano-crystal nucleation and growth and promotes in-situ growth of the InVO4 nano-crystal on the surfaces of loose g-C3N4 particles.

The invention discloses a method for preparing carbon-doped zinc oxide microsphere with a multilevel structure. The method comprises the following steps: dissolving zinc gluconate into water to obtain a zinc gluconate solution; regulating the pH value of the zinc gluconate solution and performing ultrasonic treatment; putting the zinc gluconate solution into a microwave hydrothermal synthesizer to perform synthetic reaction; naturally cooling to room temperature after the reaction is finished, so as to obtain an intermediate product; performing centrifugal separation on the intermediate product to obtain a solid; calcining the solid to obtain the carbon-doped zinc oxide microsphere with the multilevel structure. The zinc oxide microsphere is assembled by nanometer zinc oxide particles, and the diameter of the zinc oxide particles is 30-50nm and the diameter of the zinc oxide microsphere is 1-10 microns. In addition, the prepared carbon-doped zinc oxide microsphere has a multipore loosened structure, is high in specific surface area and high in controllability of carbon doping content, can be used in the fields of photocatalysis of visible light and solar utilization and has application prospect.

The invention relates to a photocatalytic material with visible light response capability and a core-shell structure, and a preparation method. The material takes a rodlike single crystal of ZnO as a core, and is coated with a V2O5 polycrystal shell layer. The preparation method of the photocatalytic material comprises the following steps: by adopting a thermal evaporation method, synthesizing a single-crystal rodlike ZnO nanomaterial by taking ZnO powder and graphite powder as raw materials; by adopting a chemical vapor deposition method, depositing a V2O5 precursor on the surface of the rodlike ZnO nanomaterial by taking vanadiumoxy acetylacetonate [VO(acac)2] as a raw material under the nitrogen protection; finally performing thermal oxidization on the coated material to form a the photocatalytic material with a V2O5@ZnO core-shell structure. The core-shell photocatalytic material is controllable in morphology, strong in repeatability, stable in structure, good in photocatalysis effect, and the method is simple in technology, and suitable for large-scale industrial product, and has excellent application prospects.

The invention provides a method for preparing vanadium-doped strontium titanate nanometer photocatalytic material. Mix the vanadium sources required for doping, and then react for several hours under high temperature conditions, and finally grow into vanadium-doped strontium titanate. The method has the characteristics of few types of raw materials, simple operation method, simple process, low cost, and environmental protection. The prepared vanadium-doped strontium titanate photocatalytic material is useful for studying its photoresponsive photocatalytic mechanism and for other perovskite photocatalytic materials. The preparation is of great significance.

The invention provides a method for preparing bismuth oxybromide with a three-dimensional flower-like structure, comprising: providing a quaternary ammonium bromide salt solution and a bismuth nitrate solution, and uniformly mixing the quaternary ammonium bromide salt solution and the bismuth nitrate solution to obtain Mixed solution; filter the mixed solution after standing at room temperature for 10h-30h to obtain a precipitate, and wash the precipitate to obtain bismuth oxybromide with a three-dimensional flower-like structure; the preparation process is simple and the reaction conditions are mild , without heating, reaction and self-assembly can occur at room temperature; the reaction speed is fast, the cost is low, and no complicated reaction equipment is needed; the prepared three-dimensional flower-like structure of bismuth oxybromide has excellent visible light response ability and high photocatalytic efficiency , which is conducive to its application in the field of photocatalysis.

The invention discloses a method for preparing hollow spherical porous BiVO4 with the aid of a surfactant, which comprises the following steps of: under a stirring condition, dissolving bismuth nitrate and ammonium meta-vanadate in 2 mol / L solution of nitric acid in a molar ratio of bismuth nitrate to ammonium meta-vanadate to nitric acid of 1:1:10; adding polyvinylpyrrolidone (PVP) and carbamideinto the mixed liquid in a molar ratio of bismuth nitrate to PVP to carbamide of 1:0.0075-0.0125:3; transferring the mixed liquid to a stainless steel self-pressure reactor of which the lining is teflon and the volume filling degree is 50 percent, and to a thermostat to perform hydro-thermal treatment for 30 hours at the temperature of 100 DEG C; cool a product naturally to room temperature afterthe product is taken out; drying the product for 24 hours at the temperature of 60 DEG C; and finally calcining the product in a muffle furnace to obtain hollow spherical porous BiVO4 particles with a monoclinic scheelite structure. The method has the characteristics of cheap raw materials, simple process, controllable appearance and crystalline phase structure of the target product particles andthe like.

The invention relates to a 1.70 refractive index polyurethane resin lens and a preparation method thereof, belonging to the technical field of optical lens preparation. In the present invention, the β-cyclodextrin is first alkalized and then added with glycidyl trimethyl ammonium chloride for heating reaction to prepare the cationic cyclodextrin, and then the cationic cyclodextrin is added to the hydrolyzed solution of titanium tetrachloride to prepare the cationic cyclodextrin. The modified nano-titanium dioxide is obtained, and then the modified nano-titanium dioxide is surface-modified with isocyanate to obtain a self-made titanium dioxide additive. Finally, it is mixed with a polythiol compound to obtain a polyurethane monomer. After adding auxiliary materials and catalysts, the 1.70 polyurethane lens is obtained by casting. , The polyurethane resin lens prepared by the invention has high refractive index, high mechanical strength, thin thickness and good light transmittance, and has broad application prospects.

The invention provides a halophile photosensitive protein-titanium dioxide nanotube composite and a preparation method thereof. Photosensitive protein is halophilic archaea rhodopsin protein, and the colibacillus is modified to express the rhodopsin protein in a large quantity. After bacteria are broken ultrasonically, Beta-mercaptoethanol and acyl sarcosine are used for extracting membrane protein, and the membrane protein is then processed by TritonX-100. The preparation method for the composite includes the following steps: titanium dioxide nano material is put into protein solution, vacuumized for a period of time and then dehydrated under low temperature, and thereby the halophile photosensitive protein-titanium dioxide nanotube composite is prepared. The process flow related to the invention is simple, used reagents are cheap, and the composite has good visible light-responding ability, can effectively reduce the recombination probability of photoinduced electron-hole pairs and increase the photoelectric response of a TiO2 nanotube array, and has a broad application prospect in the field of photoelectric devices.

A photocatalyst Bi 5 o 7 The synthesis method and application of Br belong to the technical field of nanomaterials and can solve the problem of existing Bi 5 o 7 The preparation of the Br catalyst requires high temperature and high pressure, long-term reaction and organic solvent dissolution. The present invention uses bismuth nitrate pentahydrate and sodium bromate as raw materials, ammonia water as the pH value regulator, and utilizes a simple, economical and environmentally friendly normal temperature hydrolysis method. The band gap is narrow, the visible light response ability is strong, and the composition of a single Bi 5 o 7 Br photocatalyst, the raw materials used in the present invention are cheap and easy to obtain, no organic solvent is used, the method used is simple and easy, economical and environmentally friendly, no toxic and harmful by-products are produced, the conditions used are normal temperature and pressure, simple and safe, and it is easy to realize industrial production.