86results about How to "Visible light response range is wide" patented technology

The invention discloses a high-efficiency graphene/silver phosphate composite visible light photocatalyst and a preparation method thereof, belonging to the technical field of composite materials and environmental management photocatalysis. The preparation method comprises the following steps: dissolving graphene oxide in water, and carrying out ultrasonic treatment to obtain a graphene oxide dispersed liquid; dissolving silver nitrate in deionized water, gradually and dropwisely adding into the graphene oxide dispersed liquid while stirring to obtain a mixed solution, uniformly stirring, and aging; dropwisely adding a prepared disodium hydrogen phosphate or sodium dihydrogen phosphate solution into the graphene oxide-silver nitrate mixed solution, continuing stirring, transferring into a hydrothermal reaction kettle, carrying out hydrothermal reaction, and cooling to room temperature; and washing the reaction product, and carrying out vacuum drying to obtain the visible light photocatalyst. The invention has the advantages of wide material sources and simple preparation process; and the obtained composite material has the advantages of controllable structure and regular pattern, and has high-efficiency degradation effect on organic dyes rhodamine B and methylene blue with certain concentration under the visible light irradiation.

The invention belongs to the technical fields of material preparation and photocatalysis, and discloses a phenyl ring modified graphite-like carbon nitride photocatalyst, and a preparation method and an application thereof. The method comprises the following steps: 1, dissolving nitrogen-containing organic micro-molecules and a phenyl ring-containing compound in a solvent, and evaporating the obtained solution until the solution is dry in order to obtain a mixed precursor; and 2, roasting the mixed precursor to obtain the phenyl ring modified graphite-like carbon nitride photocatalyst, wherein the nitrogen-containing organic micro-molecules are one or more of urea and melamine; and the phenyl ring-containing compound is one or more of trimesic acid, phenol, benzoic acid and benzaldehyde. The electron structure of the photocatalyst is changed by phenyl ring modification, so the pi electron delocalization of graphite-like carbon nitride is excited, the absorption of visible lights is improved, compounding of photon-generated carriers is inhibited, and the photocatalytic hydrogen production performance is improved. The method has the advantages of simple preparation, no expensive device and good practical application prospect.

The invention discloses a graphene oxide/silver phosphate/P25 composite material and a preparation method thereof, and belongs to the technical field of composites and photocatalysis for environmental management. The preparation method includes steps of dissolving graphene oxide into water to obtain graphene oxide dispersion under ultrasonic treatment; ultrasonically dispersing silver phosphate and P25 into deionized water to obtain mixed solution, adding the mixed solution into the graphene oxide dispersion drop by drop while stirring so as to obtain a mixed precursor; dripping a prepared phosphate solution into the mixed precursor of the graphene oxide, the silver phosphate and the P25 slowly while stirring continuously so as to obtain a celadon product through reaction, centrifugally separating the celadon product, washing the product with the deionized water and absolute ethyl alcohol multiple times, and drying the product in vacuum so as to obtain the composite material. The graphene oxide/silver phosphate/P25 composite material prepared by the method has high photocatalysis degradation effect to organic dye Rhodamine-B after being initiated by visible light, and also has excellent broad-spectrum bactericidal activity to various common bacteria.

The invention discloses a single-layer bismuth tungstate nano-sheet composite photocatalyst modified by carbon quantum dots, a preparation method of photocatalyst and an application. The composite photocatalyst comprises single-layer bismuth tungstate nano-sheets and the carbon quantum dots, the single-layer bismuth tungstate nano-sheets are modified by the carbon quantum dots, and the weight ratio of the carbon quantum dots to the single-layer bismuth tungstate nano-sheets is 0.03-0.05:1. The carbon quantum dots, hexadecyl trimethyl ammonium bromide, bismuth nitrate solution and sodium tungstate solution are mixed and react in a hydrothermal manner to obtain the composite photocatalyst. The composite photocatalyst has the advantages of wide visible light response range, high degradation efficiency, good photocatalyst stability and reusable performance and the like. The preparation method of the photocatalyst has the advantages that the preparation method is simple and convenient to operate, low in raw material cost and less in energy consumption, large-scale preparation can be achieved and the like. The composite photocatalyst belongs to green synthetic technique and can be used for treating antibiotic wastewater.

A preparation method of a nitrogen-doped graphene quantum dot/zinc oxide/carbon nitride composite visible light photocatalyst comprises the steps as follows: 1) a nitrogen-doped graphene quantum dot dispersion liquid, a precursor of carbon nitride and molten salt are mixed, and the obtained mixture is uniformly ground and transferred into a crucible; 2) the crucible containing the mixture is put in a muffle furnace, calcined in the air atmosphere and then naturally cooled to the room temperature; 3) the solid mixture in the crucible is washed with hot water at 60-90 DEG C, drying is performedafter salt is removed, and the nitrogen-doped graphene quantum dot/zinc oxide/carbon nitride composite visible light photocatalyst is obtained. The preparation method is quick and simple, raw materials are easy to obtain, the cost is low, the obtained visible light photocatalyst has higher crystallinity, larger specific surface area and wider visible light response range, can realize quick transfer and separation of photo-generated carriers, has the active hydrogen rate up to 68 mu mol/h during water splitting for hydrogen production with visible light and is 3.1 times that of a binary composite visible light photocatalyst (22 mu mol/h).

The invention discloses a microorganism-assisted CO2 photoelectrocatalysis reduction method. According to the method, the method is conducted in a double-chamber quartz electrolytic bath with a cation membrane as a partition membrane; microorganisms obtained through an on-line training method and with electrical activity serve as an anode; a multi-element electrolyte containing ionic liquid serves as a cathode electrolyte; a MOFs-based composite photoelectrocatalysis material serves as a cathode; the temperature is controlled to be the room temperature; CO2 gas is led at a certain flow speed for half an hour; certain bias voltage is exerted; and under simulated sunlight irradiation, CO2 is subjected to photoelectrocatalysis reduction through the cathode to be converted into low-carbon energy while the anode treats organic waste water. The method is environmentally friendly, easy to operate and low in energy consumption, under the effect the sunlight and an electric field, CO2 efficient continuous reduction is achieved, meanwhile, the anode can also treat the organic waste water, and two functions are achieved only through one method.

The invention discloses a preparation method and application of a g-C3N4/CaIn2S4 visible light compound photocatalyst. The method comprises the following steps: dissolving a certain amount of g-C3N4 powder in deionized water; adding calcium nitrate and indium nitrate, and stirring uniformly so as to obtain suspension liquid; finally adding excessive thioacetamide, and stirring until the thioacetamide is completely dissolved to obtain a solution; moving the solution into a high-pressure kettle for hydrothermal reaction to obtain a product; and after the reaction is finished, centrifuging the product, washing, drying and grinding so as to obtain the g-C3N4/CaIn2S4 visible light compound photocatalyst. According to the method, a hydrothermal synthesis method is adopted for preparing the g-C3N4/CaIn2S4 visible light compound photocatalyst; the preparation method is simple, the cost is low, and no pollution discharge exists in the preparation process; the prepared photocatalyst has good photocatalysis activity, and can be effectively applied to degradation of organic dye pollutants in waste water.

The invention provides a preparation method of a composite photocatalyst. The preparation method comprises the following steps: mixing graphite-phase carbon nitride and a non-proton organic solvent to obtain a graphite-phase carbon nitride dispersion solution; mixing metal phthalocyanine disclosed as Formula I, a condensing agent, a neutralization agent and a non-proton organic solvent to obtain a metal phthalocyanine solution; dropwisely adding the graphite-phase carbon nitride dispersion solution into the metal phthalocyanine solution, and heating the obtained reaction solution to carry out condensation reaction, thereby obtaining a composite photocatalyst precursor; and mixing the composite photocatalyst precursor with TiO2 and water, and compounding under ultrasonic conditions to obtain the composite photocatalyst. In the composite photocatalyst prepared by the method provided by the invention, the graphite-phase carbon nitride and metal phthalocyanine are linked by amido bonds; the graphite-phase carbon nitride and titanium dioxide are sensitized by the metal phthalocyanine, thereby effectively widening the visible light response range of the photocatalyst and enhancing the solar energy utilization ratio; and thus, the composite photocatalyst has favorable application prospects in organic matter catalytic oxidation.

The invention discloses a copper sulfide/bismuth vanadate heterojunction photocatalyst and a preparation method thereof. The copper sulfide/bismuth vanadate heterojunction photocatalyst comprises a copper sulfide and bismuth vanadate, and the copper sulfide is attached to the bismuth vanadate. The preparation method comprises the following steps: preparing a suspension of bismuth vanadate and copper nitrate; preparing a suspension liquid of bismuth vanadate, copper nitrate and sodium thiosulfate; carrying out water bath reaction on the suspension liquid of bismuth vanadate, copper nitrate andsodium thiosulfate to obtain the copper sulfide/bismuth vanadate heterojunction photocatalyst. The copper sulfide/bismuth vanadate heterojunction photocatalyst has the advantages of being wide in visible light response range, high in quantum efficiency, high in photocatalytic activity and the like, is a novel semiconductor photocatalytic material, and has good application value and application prospect, the catalyst prepared by the preparation method is high in crystallization degree, free of impurities in the preparation process, simple in process, mild in reaction conditions, convenient to operate, clean, pollution-free and the like, is suitable for large-scale preparation, and is convenient for industrial utilization.

The invention discloses a carbon-based photocatalytic oxidation denitration catalyst which is characterized in that the catalyst comprise the following ingredients in parts by weight: 89-99 parts of carbon-based material, 1-11 parts of titanium dioxide, 0.1-1.1 parts of upconversion luminescent material containing rare earth ions, and 0.11-1.1 parts of partial reduction oxidized graphene. The catalyst has the advantages that a visible light response range of titanium dioxide is widened by taking activated semicoke that is wide in source, low in price and easy to regenerate as the carbon-based material, combining the characteristic that a photocatalytic technology takes H2O as a reactor and employing a property that the upconversion luminescent material containing the rare earth ions emit ultraviolet light when excitated by visible light, and composition of TiO2 photoproduction electrons and holes is improved by combining the characteristics that the sheeted partial reduction oxidized graphene can capture the electrons and has high transmission performance. The catalyst can be widely used for photocatalytic oxidation denitration of smoke in a coal-fired power plant, a coal fired boiler, a coal fired kiln, and the like.

The invention discloses a preparation method and application of a cubic-structure CuCr2O4 visible light photocatalyst. The preparation method includes the steps that cupric nitrate and chromic nitrate are dissolved in deionized water, sodium hydroxide is added to adjust the pH value of the solution, the solution is heated to a certain temperature and evenly stirred at the temperature to obtain a suspension, the suspension is moved to an autoclave for being subjected to hydrothermal reaction, after the reaction is finished, a reaction product is centrifuged, washed, dried and grinded to obtain a precursor, and the precursor is calcinated at a certain temperature for certain time to obtain the cubic-structure CuCr2O4 visible light photocatalyst. The cubic-structure CuCr2O4 visible light photocatalyst of a square crystalline phase is prepared by adopting the hydrothermal synthesis method, the preparation technology is simple and low in cost, the preparation process is free of pollutant discharge, the prepared photocatalyst is high in photocatalytic activity and capable of being effectively used for degrading organic dyestuff pollutants in waste water.

The invention discloses a preparation method and application of a magnesium titanate/graphite-phase carbon nitride composite visible light photocatalyst. The invention aims to solve the technical problem of non-ideal photocatalytic activity caused by relatively high recombination rate of existing g-C3N4 photo-induced electron holes. The preparation method comprises the following steps: synthesizing g-C3N4 with a relatively high specific surface area by adopting a pyrolysis method, then preparing magnesium titanate with a perovskite structure by adopting a hydrothermal method, and finally preparing the magnesium titanate/g-C3N4 composite visible light photocatalyst by adopting a ball milling method. According to the photocatalytic material disclosed by the invention, semiconductors with different band gap energy levels are compounded to form a heterostructure, so that the photocatalytic material has an excellent and adjustable photo-induced electron hole separation rate and a relativelywide spectral response range under visible light, and can be applied to visible light catalytic hydrogen production in the field of energy sources.

The invention discloses a bismuth molybdate photocatalysis material rich in surface oxygen defects. The bismuth molybdate photocatalysis material rich in surface oxygen defects comprises a bismuth molybdate photocatalysis material, and oxygen defects are introduced to the surface of the bismuth molybdate photocatalysis material through calcinations. The invention also discloses a preparation method of the bismuth molybdate photocatalysis material rich in surface oxygen defects. The preparation method concretely comprises the following steps: 1, preparing a bismuth molybdate-based catalysis material; and 2, performing calcination to introduce the oxygen defects to the surface of the bismuth molybdate-based catalysis material obtained in step 1 in order to prepare the bismuth molybdate photocatalysis material rich in surface oxygen defects. The bismuth molybdate photocatalysis material rich in surface oxygen defects has the advantages of non-agglomeration, wide visible light response range and good reusability, and has a significantly higher catalytic activity than pure bismuth molybdate; and the preparation method has the advantages of simplicity, mild conditions, good controllability, and convenience in operation.

The invention discloses a bismuth oxide/bismuthyl carbonate/bismuth molybdate composite photocatalytic material. The composite photocatalytic material includes a bismuth molybdate photocatalytic material, bismuthyl carbonate and bismuth oxide nanosheets are introduced to the surface of the bismuth molybdate photocatalytic material through Na2CO3 assistance and roasting. The invention also discloses a preparation method of the bismuth oxide/bismuthyl carbonate/bismuth molybdate composite photocatalytic material. The method is specifically implemented according to the steps of: 1. preparing a bismuth molybdate based catalytic material; and 2. introducing bismuthyl carbonate and bismuth oxide nanosheets to the surface of the bismuth molybdate based catalytic material obtained in step 1 by Na2CO3 assistance and roasting, thus obtaining the bismuth oxide/bismuthyl carbonate/bismuth molybdate composite photocatalytic material. The material is free of agglomeration, has wide visible-light response range, significantly improved catalytic activity relative to pure bismuth molybdate, and good reusability, also the preparation process is simple, the conditions are mild, the controllability isgood, and the operation is convenient.

The invention discloses a preparation method of a hydrophobic TiO2 visible-light catalyst. The hydrophobic TiO2 composite visible-light catalyst with high adsorption and wide spectral response is prepared by utilizing the strong adsorption property of hydrophobic attapulgite after being irradiated by high-power electron beams and the doping vario-property of migrating metal cations on the surfaceof the attapulgite, and the problems that a TiO2 photocatalyst has no adsorption or concentration capacity for strongly hydrophobic organic pollutants and is narrow in the spectral response range aresolved. The novel hydrophobic TiO2 visible-light catalyst material has the capacity of efficient concentration of the strongly hydrophobic organic pollutants and visible light degradation, and can beused for light degradation of indoor and industrial low-concentration VOCs (volatile organic chemicals) and water bodies and strongly hydrophobic organic matters in soil.

The invention relates to a preparation method for a 3D morphological silver/silver bromide/titanium dioxide photocatalyst and a product and application thereof. The 3D morphological Ag/AgBr/TiO<2> photocatalyst is prepared with titanate, concentrated hydrochloric acid, CTAB (cetyltrimethyl ammonium bromide), water, glycol, urea, silver nitrate and ammonia water as materials by the method of carrying silver under a high-temperature and high-pressure environment. Titanate and concentrated hydrochloric acid are first mixed, the aqueous solution of CTAB is then dripped into the titanate solution,a certain amount of glycol and a certain amount of urea are respectively added into the mixed solution of titanate and CTAB and uniformly mixed, hydrothermal reaction is then carried out under 150 DEGC, silver nitrate and ammonia water are added into suspension obtained by the hydrothermal reaction and agitated for 24 hours, centrifugal washing and drying are then carried out, roasting is carriedout under 400 DEG C for 2 hours, and after roasting, the sample is reduced under ultraviolet light for 3 hours. The process of the method is simple, the requirement on equipment is low, and the prepared composite photocatalyst has strong response to tetracycline hydrochloride under the condition of visible light.

The invention provides a Co/V double-metal-doped g-C3N4 photocatalyst and a preparation method and application thereof, and belongs to the technical field of photocatalyst synthesis. According to thepreparation method, the Co/V double-metal-doped g-C3N4 photocatalyst is synthesized in one step through a simple and rapid thermal polymerization method, g-C3N4 is modified through element doping, andthe visible light response range is directly expanded through the double-doping effect of Co/V elements. The Co/V double-metal-doped g-C3N4 photocatalyst can be used for visible light catalytic degradation of tetracycline hydrochloride pollutants.

The invention provides an In2S3/MIL-53(Fe) efficient photocatalytic composite material, a preparation method and application. The mass ratio of In2S3 to MIL-53(Fe) is (10-30):1. The preparation methodcomprises the following steps: step 1, mixing InNO3 hydrated with 4.5H2O with MIL-53(Fe), and adding the mixture into water; step 2, dissolving L-cysteine in the same amount of water as that in the step 1; step 3, dropwise adding the solution obtained in the step 2 into the mixed solution obtained in the step 1 under a stirring condition, conducting stirring at room temperature, transferring a formed mixture into a high-pressure reaction kettle with a polytetrafluoroethylene lining, and carrying out sealed reaction; and step 4, naturally cooling the reacted mixed solution obtained after the reaction in the step 3 to room temperature, repeatedly conducting washing with water and absolute ethyl alcohol to remove impurities from the product, and conducting drying to obtain the In2S3/MIL-53(Fe) high-efficiency photocatalytic composite material. According to the efficient photocatalytic composite material disclosed by the invention, In2S3 is introduced, so that the diameter of an MIL-53(Fe) microrod is increased, the surface is rougher, more active sites can be provided, and the photocatalytic activity is favorably improved.

The invention discloses antiviral flame-retardant weather-resistant coating. The coating is characterized in that the coating comprises, by weight, 2 to 5 parts of epoxy hexamethylene tetramine salt,30-40 parts of a 4-propenylthiosemicarbazide/1-allyl-3-methylimidazolium chloride/zeatin nucleoside/isobornyl acrylate copolymer, 5-8 parts of modified Ti-Cu-Hf-O, 1-3 parts of antiviral Chinese herbal medicine powder, 10-15 parts of an inorganic filler, 10-15 parts of a solvent, 1-3 parts of a dispersing agent and 0.5-1.5 parts of a defoaming agent. The invention also discloses a preparation method of the antiviral flame-retardant weather-resistant coating. The antiviral flame-retardant weather-resistant coating disclosed by the invention is excellent in comprehensive performance, remarkablein antiviral effect, good in weather resistance and flame resistance, high in bonding strength with a base material and long in service lifetime.