124results about How to "Good photodegradation effect" patented technology

The invention discloses the application of cupric borate Cu3B2O6 as a visible light catalyst. Specifically, cupric borate can be used as a visible light catalyst for degrading organic dye wastewater under the condition of visible light, and especially can be used for carrying out visible light catalytic degradation on dye wastewater containing methylene blue. The invention also discloses a specific application method. According to the invention, provided Cu3B2O6 powder is added into a methylene blue solution, then a photocatalytic degradation reaction is performed under the condition of visible light (wavelength: 420-800 nm), and the removal ratio of methylene blue in water is as high as 99.52%, therefore, cupric borate Cu3B2O6 is high in photocatalytic degradation ability, and advantageous to the industrialization of a Cu3B2O6 photocatalytic dye wastewater treatment technology.

The invention discloses a GO (graphene oxide) and g-C3N4 composite modified membrane material. A preparation method includes steps: activating an original membrane to recover original membrane flux; adding a surfactant into GO and g-C3N4 mixed dispersion liquid to obtain mixed liquid; soaking the activated original membrane into the mixed liquid to realize ultrafiltration adsorption, and soaking the membrane into aniline hydrochloric acid solution; taking out after soaking is finished, and soaking in hydrochloric acid solution of ammonium persulfate immediately to enable interface polymerization reaction; finally, drying the membrane to obtain the composite modified membrane material. By an ultrafiltration adsorption and interface polymerization combined modification method, GO and g-C3N4are combined for surface composite modification of the membrane material, and a visible light responsive catalytic modified membrane is developed. The novel modified membrane is low in preparation cost and recyclable, pollution resistance is remarkably improved, firmness in modifying agent and photocatalyst loading is achieved, the visible catalytic performance and hydrophilic performance are remarkably enhanced, the forbidden bandwidth of a membrane function layer is decreased, the problem of secondary pollution is avoided, and a promising application prospect is achieved.

The invention discloses a preparation method of one-dimensional silicon nanowires with different linear densities. The method includes following steps of, a, preprocessing a silicon chip; b, preparing a one-dimensional silicon nanowire array by means of a metal catalysis etching method; and c, performing postprocessing, wherein the metal catalysis etching method includes two steps of, step one, depositing silver nanoparticles: impregnating the preprocessed silicon chip in an HF-AgNO3 mixed aqueous solution for 20-40 seconds, the concentration of HF is 0.1-0.2 mol/L, and the concentration of AgNO3 is 0.008-0.012 mol/L; and step two, performing metal assisted etching: immersing the silicon chip obtained from the step one into an HF-H2O2 mixed etching solution, and performing etching for 20-40 minutes under a room temperature. According to the preparation method of the one-dimensional silicon nanowires with the different linear densities, the photoelectric properties of the prepared one-dimensional silicon nanowire array are obviously improved in ultraviolet diffuse reflection, photocurrent characteristics and photocatalysis reaction, technological parameters can be adjusted to control shapes and densities of the silicon nanowires, and the preparation method is simple, low in cost and pollution-free.

A preparation method of a rod-like bismuth phosphate loaded biomass carbon aerogel material belongs to the technical field of material preparation and photocatalytic environmental pollution control. The preparation method comprises the following steps: removing skin and bladder of a white gourd, and preparing biomass carbon-based wet gel according to a hydrothermal method without adding any surfactant. The prepared rod-like bismuth phosphate loaded biomass carbon aerogel material is 0.3 to 0.5 [mu]m in diameter, and has such a photocatalytic degradation effect on a simulative dyeing wastewater methylene blue solution that the degradation rate of methylene blue in a 10 mg/L methylene blue solution can reach up to 90 percent when the bismuth phosphate loaded biomass carbon aerogel material is added into the methylene blue solution and the mixture is exposed in visible light for 3.5 hours, so that the rod-like bismuth phosphate loaded biomass carbon aerogel material can be applied to the field of dyeing wastewater treatment.

Belonging to the technical field of inorganic chemistry, the invention discloses a preparation method of a porphyrin COF and carbon nitride composite material and application in photocatalytic degradation of organic dyes. Copper tetraminophenyl porphyrin and terephthalaldehyde are compounded on the surface of g-C3N4 through amine-aldehyde condensation reaction by grinding. The method has the advantages of simple operation, mild reaction conditions, high yield, low cost, easy large-scale production and the like. The material CuP-Ph-COF/g-C3N4 is used as a photocatalyst to degrade the dye rhodamine B, shows excellent ability of photocatalytic degradation of organic pollutants, and is expected to be practically applied in dye wastewater treatment.

The invention relates to a modified polychloroethylene resin, which mainly comprises polychloroethylene and modified nanometer titania. The modified nanometer titania is mainly prepared by the mixture of the nanometer titania and silane coupling agent which is showed by pattern I, proportion by weight of the nanometer titania and the polychloroethylene is 1 :( 5-500). The modified polychloroethylene resin which is prepared by the invention has better light (ultraviolet light or day light) degradability, and has higher light transmittance ratio, and the invention can be used to prepare environment-friendly-type plastic products. In the pattern I, R1, R2 and R3 are respectively chosen from one of alkoxy group of C1-C6 or O (CH2) aOR4, and a is 1-6 acroleic acid whose R4 is C1-C6.

The invention relates to a high-toughness matte modified polylactic acid material for 3D printing and a preparation method of the high-toughness matte modified polylactic acid material. The modified polylactic acid material is prepared from, by weight, 100 parts of polylactic acid, 10-15 parts of a main toughening agent, 5-8 parts of an auxiliary toughening agent, 20-40 parts of filler, 3-6 partsof silicon dioxide matting powder, 0.1-0.5 part of a titanate coupling agent, 0.1-0.6 part of an antioxidant, 0.1-0.6 part of a light stabilizer and 0.2-0.5 part of a lubricant, wherein the main toughening agent is a soft-core hard-shell type core-shell copolymer with methyl methacrylate as a shell, the auxiliary toughening agent refers to an elastomer toughening agent containing anhydride or epoxy group, and the filler refers to barium sulfate powder or calcium carbonate powder. The high-toughness matte modified polylactic acid material for 3D printing is excellent in toughness, remarkable inaging resistance and great in matte surface effect.

The invention relates to a titanium dioxide/boron nitride composite material and a preparation method and application thereof. The preparation method of the titanium dioxide/boron nitride composite material comprises the following steps that boric acid, a carbon source, nitric acid and urea are mixed to be even by using water, mixed liquid is obtained, the mixed liquid is heated to be 300-500 DEGC and subjected to heat preservation for 15-30 minutes, a precursor is obtained, the precursor is subjected to heat preservation for 2-5 hours under a condition of ammonia gas and at the temperature of 700-1000 DEG C, and boron nitride is prepared; and a titanium source and boron nitride prepared in the step (1) are mixed to be even by using an alcohol solvent, then a mixture is obtained, the mixture is subjected to heat preservation for 12-24 hours at the temperature of 150-180 DEG C, and the titanium dioxide/boron nitride composite material is prepared. The prepared boron nitride has a larger specific surface area and a smaller band gap. The prepared titanium dioxide/boron nitride composite material has good adsorption and photocatalytic effects on Rhodamine B, and can rapidly and completely remove Rhodamine B dyestuff.

The embodiment of the invention provides a preparation method of an air purifying material and the air purifying material and relates to the technical field of photocatalytic semiconductors. The preparation method comprises the following steps of: mixing zinc acetate and gallium nitrate to obtain a mixed substance; adding a solvent into the mixed substance to form a sol-gel shaped precursor; sintering the sol-gel shaped precursor to form a porous granular zinc gallate precursor; and nitriding the porous granular zinc gallate precursor to form a porous gallium nitride zinc oxide solid solution. Therefore, the problems that the utilization ratio of solar energy by a conventional photocatalyst is not high, the contact area with organic pollutants is relatively small, and the photo-degradation effect of the organic pollutants is poor are solved. The porous gallium nitride zinc oxide solid solution is synthesized through the sol-gel method and can respond to visible light, so that the utilization efficiency of solar energy is increased; meanwhile, the contact surface area with the organic pollutants is increased due to the porous structure, the utilization efficiency of a photocatalyst is increased, and the photo-degradation effect of the organic pollutants is enhanced.

The invention discloses a synthesis method of a ball-flower shaped structure ZnO/ZnWO4 photocatalyst, and belongs to the technical field of chemical industry. The method comprises the following steps: mixing and putting zinc nitrate (Zn(NO3).6H3O) and sodium tungstate (Na2WO3.2H3O) chemical reagent materials into deionized water, uniformly stirring the materials, performing microwave radiation reaction through a microwave reactor, repeatedly washing the materials through deionized water and absolute ethyl alcohol separately, and drying the materials, so as to obtain the final product ZnO/ZnWO4 composite photocatalyst. The surface appearance, photocatalytic activity and the property of photocatalytically splitting of water into hydrogen of the photocatalyst are determined, and the product performance is greatly enhanced in terms of degrading organic pollutant malachite green and photocatalysis of photocatalytically splitting of water into hydrogen. A microwave-assisted one-step synthesis method is adopted, and the synthesis method has the characteristics of short reaction time, uniform generated products and simple and practical production process, and samples and mass production performance are stable and reliable.

The invention provides a preparation method of a photocatalyst Cu-CuO-MnO2, belonging to the technical field of photocatalysts. The preparation method of the photocatalyst Cu-CuO-MnO2 comprises the following steps of: polishing and washing a copper foil serving as a substrate, then soaking the copper foil in an alkaline solution for reacting for 40-60 minutes to obtain Cu-Cu(OH)2, wherein the alkaline solution is obtained by mixing 10mol/L of NaOH solution, 1mol/L of Na2S2O8, 25% ammonium hydroxide and water according to a certain volume ratio; and putting the prepared catalyst in 0.02-0.05mol/L of KMnO4 solution to carry out hydrothermal reaction for 3-5 hours at the temperature of 110-130 DEG C, cleaning and drying a reaction product, and roasting for 2-4 hours at the high temperature of 240-350 DEG to obtain the photocatalyst. The photocatalyst has the beneficial effects that the photocatalyst has relatively strong light degradation capacity for printing and dyeing wastewater in visible light and the removal rate of up to 98.9% for methylene blue in water; and after the photocatalyst Cu-CuO-MnO2 is reused five times, the degradation rate of the photocatalyst is reduced by not more than 1.5%.

The present invention discloses a weak visible light response compound photocatalyst and a preparation thereof and an application thereof. The preparation is as follows: (1) rare earth ion nitrate andtetrabutyl titanate are mixed and dissolved to form a compound reactant solution A; (2) graphene oxide, absolute ethyl alcohol and deionized water are mixed and dissolved to form an adsorption systemB; (3) in a water bath stirring, the compound reactant solution A is slowly added dropwise to the adsorption system B to obtain a suspension system; (4) the suspension system is transferred into a high-pressure autoclave; and a hot treatment is conducted at 160 DEG C-180 DEG C after sealing; and (5) the hot-treated reaction liquid is cooled; the cooled reaction liquid is separated; and washing and drying are conducted to obtain the catalyst. The radius of the rare earth metal ions is much larger than that of Ti4+ atoms; a small amount of the rare earth ions after doping are added and then dispersed in a lattice structure of TiO2, which promotes the transformation of the TiO2 crystal form from anatase to rutile; besides, a lattice distortion structure is formed to enable parameters of unitcells to change; and at the same time, the visible light response of the catalyst is promoted and photocatalytic activity under visible light is improved.

The invention relates to a water treatment method, and specifically relates to a high-performance photocatalyst for water treatment and a preparation method thereof. The catalyst is prepared by constructing an Ag-BiVO4 metal-semiconductor heterojunction on the monoclinic bismuth vanadate crystal face {010}, constructing a Co3O4-BiVO4<p-n> heterojunction on the monoclinic bismuth vanadate crystal face {110}, or constructing an Ag-BiVO4 metal-semiconductor heterojunction and a Co3O4-BiVO4<p-n> heterojunction on the monoclinic bismuth vanadate crystal face {010} and {110} respectively. The operation is simple and practical, no expensive equipment is required, and the reagents are environment-friendly.

The invention relates to a preparation method of a Pd/ZIF-67/TiO2 nanotube composite catalyst. The method comprises the steps of: carrying out anodic oxidation on a titanium plate as a substrate to obtain TiO2 nanotubes, annealing at 550 DEG C to obtain anatase type TiO2, immersing the TiO2 nanotube substrate in a mixed solution of Co(NO3).6H2O/methanol solution and 2-methylimidazole/methanol solution to obtain a ZIF-67/TiO2 nanotube substrate, and immersing the ZIF-67/TiO2 nanotube substrate to a certain concentration of PdCl2 aqueous solution to obtain the Pd/ZIF-67/TiO2 nanotube composite material. The material has excellent capability of capturing electrons and generating more holes, has good catalysis performance in an ultraviolet-visible wide wave range, can obtain broad application prospects in the aspect of sewage treatment, and can be used for selectively carrying out catalytic reaction due to the microporous structure characteristic.

The invention discloses a mesoporous silicon dioxide compound photocatalyst. In the mesoporous silicon dioxide compound photocatalyst, silicon dioxide is used as a carrier, a photosensitive silane coupling agent is doped in a framework in the carrier, and titanium dioxide is loaded in nano hole channels of the carrier. The invention also provides a preparation method of the mesoporous silicon dioxide compound photocatalyst. The preparation method comprises the steps: firstly preparing the photosensitive silane coupling agent by using a high-temperature pyrolysis method, preparing a photosensitive silane coupling agent doped mesoporous silica material by using an in-situ loading method, performing a hydrothermal method on titanium oxide, and introducing titanium oxide after subjected to the hydrothermal method into photosensitive silane coupling agent doped silicon oxide hole channels in the framework by adopting a loading manner to finally obtain the mesoporous silicon oxide compound photocatalyst. The photosensitive silane coupling agent on the surface of the photocatalyst has the relatively good complexing capacity on metal ions, the high dispersion and the small grain size loading of a semiconductor-titanium dioxide on the photosensitive silane coupling agent-mesoporous silicon oxide compound material is realized, and therefore, the material has the very good circulation pollutant disposal capacity of pollutant enrichment firstly and pollutant degradation.

The invention discloses a zinc oxide/carbon quantum dot composite photocatalyst, a preparation method and application thereof. Aiming at the problems existing in the zinc oxide composite photocatalystat present, the synthesis method of the zinc oxide composite photocatalyst is improved; the zinc oxide/carbon quantum dot composite photocatalyst is prepared by combining carbon quantum dots with three-dimensional zinc oxide nanoflowers synthesized by a hydrothermal method. The structure of the composite photocatalyst is a nanoflower formed by stacking nanosheets, the synthetic morphology is uniform, and the composite photocatalyst has good crystallization performance. The composite photocatalyst can be used for treating various organic pollutants under simulated sunlight, and the problems oflow photocatalytic efficiency, poor reusability, high production cost and the like of the traditional photocatalyst in the prior art are solved. Meanwhile, the preparation method is simple to operateand low in cost, and has good reusability and stability.

The invention discloses a copper doped cerium oxide photocatalyst and a preparation method thereof. The molecular formula of the copper doped cerium oxide photocatalyst is CuxCe<l-x>O<2-x>, in the formula, x is 0.05-0.2. The preparation method comprises the following steps: at the room temperature, dissolving cerous nitrate and cupric nitrate in deionized water, performing ultrasonic stirring for certain time, preparing NH4HCO3 solution or Na2CO3 solution by using deionized water, performing coprecipitation reaction for 30 minutes by using a coprecipitation method through reverse titration and by controlling the temperature to be 70-80 DEG C, after the reaction is completed, cooling to be the room temperature, performing centrifugal separation, washing, drying and calcining the obtained precipitate in sequence, thereby obtaining the copper doped cerium oxide photocatalyst with good photocatalytic performance. The needed production equipment is simple, and the industrialization production is easy to achieve.

The invention relates to a method for modifying nano titanium dioxide supported on chemical nickel plating zinc phosphorus alloy which can make modifying nano TiO2 content in a compound plating layer reach to above 60wt%, the compound plating layer combines with metallic matrix well, and can be used for light-catalyzed reaction processed in solution. A special technique is that: firstly, confecting acet solution containing 6-12 g/L modifying TiO2, depositing a modifying nano TiO2 grain layer on the copper or nickle matrix by using electrophoresis technique, then placing the copper sheet or nickel sheet or plating nickel plastic sheet doping the nano TiO2 layer into the chemical plating nickel zinc phosphorus alloy solution and leaving period of time, then preparing a nickel zinc phosphorus alloy /modifying nano TiO2 compound plating layer and realizing supporting on modifying nano TiO2. The method can realize supporting on nano TiO2 granule, and increase nano TiO2 content in the depositing layer.

The invention discloses a preparation method for TiO2/WO3 composite powder. The preparation method comprises the following steps: uniformly mixing titanium sulfate, urea, alcohol and deionized water, adding acetylacetone, and uniformly stirring at the room temperature to obtain a solution A; dropwise adding concentrated nitric acid into the solution A to obtain a solution B; preparing a 0.1-0.3mol/L K2WO4 aqueous solution, and regulating the pH value to 1-3.5 to obtain a solution C; mixing the solution B with the solution C. performing hydrothermal reaction to obtain the TiO2/WO3 composite powder. According to the preparation method disclosed by the invention, the titanium sulfate, K2WO4.2H2O and the like with low price are taken as raw materials, so that the preparation cost is low; a solution containing Ti and W is prepared and a product with the advantages of low reaction temperature and short period can be prepared by adopting a one-step hydrothermal method. By using the hydrothermal method is adopted, the TiO2/WO3 composite powder with controllable morphology, high purity, small particles and a uniform particle size can be prepared.

The invention belongs to the technical field of a nanometer new material, and specifically relates to a ZnO-CdS composite material and a preparation method and application of the ZnO-CdS composite material. The composite material is made by depositing CdS nanoparticles on surfaces of ZnO nanoparticles. The preparation method comprises: mixing a deionized water solution of Zn(NO3)2.6H2O with a deionized water solution of NH4F, dropwise adding a deionized water solution of NaOH to the mixed solution till the obtained solution is semitransparent, performing centrifugation to obtain white precipitation and performing washing and drying to obtain ZnO nanoparticles; and adding the ZnO nanoparticles to a deionized water solution with Cd(NO3)2.4H2O and thiourea dissolved to form a suspension liquid, and performing deposition and centrifugation to obtain a ZnO-CdS product. The composite material is excellent in photodegradation capability of rhodamine B and methylene blue.

The invention discloses a method for preparing a carbon-doped TiO2 film by using a two-step method. The method comprises the following steps: (1) a TiO2 film is prepared by adopting a magnetron sputtering method; processed glass, silicon sheet and titanium sheet substrates are put in place; a TiO2 ceramic target serves as a sputtering target; a background is kept in 2*10-3 Pa order of magnitude in vacuum; 99.999% of argon and compensate oxygen are charged; the sputtering power is 300 W; the sputtering time is 30 minutes; and the temperature is kept for 2 hours in the air of 500 DEG C, and is naturally reduced; and (2) C is injected in the TiO2 film by using an ion injecting method; samples are put in an ion injecting chamber; CH4 gas is charged; the pressure is 1 Pa; the radio-frequency power is 40 W; the voltage is respectively 8, 10, 12, 14 and 16 kV; and the frequency is 50 Hz. The injecting time of each sample is 30 minutes. The C-TiO2 film prepared by the method has excellent light degradation effect.

The invention belongs to the technical field of preparation of transition metal oxides and relates to a preparation method of Cu2O nanocrystalline cubes and hollow polyhedrons to be applied to preparation occasions of catalytic materials, antifouling paint, insecticides as well as various copper salts, analytical reagents, red glass, copper plating and copper plating alloy solutions. The problem about industrial preparation of Cu2O nanocrystalline cubes and hollow polyhedrons is solved, and synthesized nanocrystals have good photocatalytic performance, can quickly adsorb azo dyes, are easy toseparate and have a good detection effect on nitrobenzene in a Na2SO4 solution. Firstly, copper acetate monohydrate and sodium hydroxide are subjected to a reaction, sodium dodecyl sulfate is used asa surfactant and a stabilizer, deionized water and a hydrazine hydrate aqueous solution in different volume ratios are added, and the Cu2O nanocrystalline cubes and hollow polyhedrons are prepared. The preparation technology is simple, the principle is reliable, the preparation cost is low, and products are high in purity, good in performance, wide in application range and environmentally friendlyin use.