817 results about "Photocatalytic decomposition" patented technology

The invention belongs to the technical field of a new chemical material, and in particular relates to a high-durability super-hydrophobic self-cleaning coating material and a preparation method thereof. The coating material of the invention is prepared by curing and drying nanoparticles with photo-catalytic activity, a low-surface-free-energy polymer and a cross-linking agent at the room temperature, wherein the low-surface-free-energy polymer consists of one or more of polysiloxane fluoride, dimethyl silicone polymer and polyphenylene methyl siloxane, which contain active groups, such as hydroxyl alkoxy group, carbon-carbon double bond, silanol group, siloxy group, and the like; the cross-linking agent is hydrogen-containing silicone oil or aminosilane; and the mass content of the photo-catalytic nanoparticles in the coating ranges from 10 to 60 percent. The coating is formed into a micro-nanostructure by nanoparticle self-organization; a super-hydrophobic self-cleaning coating with lotus effect is prepared from the coating and a cross-linked filming matrix with low surface energy; the persistence of a lotus-shaped super-hydrophobic characteristic of the coating is realized by using the photo-catalytic decomposition characteristic of an organic pollutant for the nanoparticles; and thus the material is suitable for large-area construction and has high weathering resistance andprominent self-cleaning characteristic.

The present invention discloses a method for preparing heteroatom doped carbon quantum dot, and application thereof in fields of biomedicine, catalysts, photoelectric devices, etc. The various kinds of heteroatom doped carbon quantum dots are obtained by using a conjugated polymer as a precursor and through a process of high temperature carbonization. These carbon quantum dots contain one or more heteroatoms selected from the group consisting of N, S, Si, Se, P, As, Ge, Gd, B, Sb and Te, the absorption spectrum of which ranges from 300 to 850 nm, and the fluorescence emission wavelength of which is within a range of 350 to 1000 nm. The carbon quantum dot has a broad application prospect in serving as a new type photosensitizer, preparing drugs for photodynamic therapy of cancer and sterilization, photocatalytic degradation of organic pollutants, photocatalytic water-splitting for hydrogen generation, organic polymer solar cell and quantum dot-sensitized solar cell.

This invention relates to a method for preparing an activated carbon fiber of Titania particle having nanometer and its usage. The fiber is formed from the activated carbon fiber material loaded with the Titania particles, wherein the mass ratio of the Titania particles is 5~25%. The preparing method uses the sol-gel processing: a) hydrolyzing organic titanium compounds of the TiO2 to the TiO2 collosol, and depositing on the activated carbon fiber, b) drying the colloslo and getting the jel, c) annealing, and transforming to nanometer TiO2 particles compounded in the surface of the fiber, then getting the fiber. The fiber not only maintains the poriness but also enhances the optical catalytic activity of the Titania particle, and can be used for removing the volatile organic contaminant with low concentration, wherein its absorbance can reach to 500mg/g and its optical catalytic dissolution rate can reach to 36%.

The invention relates to a catalyst for decomposing hydrogen sulfide by photocatalysis and a preparation method of hydrogen and liquid sulfur by employing same. The catalyst comprises a carrier, active component and assistant and has the characteristics that the carrier is one or more selected from vanadate, niobate and tantalate, the active component is one or more selected from alkali metal hydroxide, alkaline earth metal hydroxide, alkali metal nonmetal oxysalt, alkali metal nonoxysalt, alkaline earth metal nonmetal oxysalt and alkaline earth metal nonoxysalt and the assistant is lanthanide oxide or VIII group oxide. The catalyst of the invention can be used for preparing hydrogen and liquid sulfur so that the produced sulfur is easy to be separated from the catalyst, the catalyst can be recycled and the sulfur contained in hydrogen sulfide can be fully recycled, thus realizing the comprehensive utilization of hydrogen sulfide.

The invention relates to a preparation method of a solar light splitting water hydrogen production catalyst without noble metal as a cocatalyst. Specifically, graphene is used as a cocatalyst to prepare semiconductor nanoparticle-graphene composite photocatalysts, including CdS-graphene composites and TiO2-graphene composites. The hydrogen production efficiency of the photocatalyst with graphene as the cocatalyst is comparable to or even higher than that of the photocatalyst containing the same mass of noble metal Pt under the same hydrogen production conditions. Graphene materials have good electron aggregation and transport functions, which promote the effective separation of electrons and holes, reduce the probability of proton recombination, and increase the photocatalytic efficiency of photocatalysts and the efficiency of photo-splitting water to produce hydrogen; and the preparation method of graphene materials is simple , cheaper than precious metals, and has no pollution to the environment, which is conducive to large-scale preparation and production. The preparation of photocatalysts using graphene as a cocatalyst has opened up a new method for reducing the cost of hydrogen production from solar energy and improving the efficiency of hydrogen production by photolysis of water.

The invention discloses a composite antibacterial anion air cleanser and a preparation method thereof. The air cleanser comprises the following raw materials by weight percent: 0.5-30 % of colorless and transparent anion crystal/powder, 0.5-2 % of photocatalyst powder, 1-10 % of a transparent nano silver solution, 1-15 % of food-grade ethanol, 0.1-5 % of natural plant essential oil and 20-50 % of deionized water. The air cleanser provided by the invention can rapidly decompose formaldehyde, benzene, ammonia and other harmful gases in spaces in a few minutes, with a cleansing rate of more than 98 %, and is rapidly and durably antibacterial and antivirus; furthermore, the air cleanser does not contain toxic chemical compositions, and is free of any side effects on the body and secondary pollution. According to the invention, the air cleanser decomposes odor molecules through anion and photocatalytic decomposition factors to remove odors, and can durably release a lot of negative oxygen ions, wherein the negative oxygen ions are known as "air vitamin" and are beneficial for human's physical and mental health, so that the air cleanser provided by the invention has relatively good health care function.

The invention relates to a molybdenum disulfide-cadmium sulfide nanometer composite material and a preparing method thereof and an application of the molybdenum disulfide-cadmium sulfide nanometer composite material to water-photocatalytic-decomposition hydrogen production. The nanometer composite material comprises nanometer cadmium sulfide, and undefined-structure layered nanometer molybdenum disulfide growing on the nanometer cadmium sulfide in an in-situ mode. According to the nanometer composite material, the nanometer cadmium sulfide serves as a carrier; as the nanometer cadmium sulfide is of a nanometer structure, on one hand, the transmission path of electron holes can be shortened; on the other hand, as the specific surface area of the nanometer cadmium sulfide is large, the loading capacity of the molybdenum disulfide can be controlled. The molybdenum disulfide is in a layered shape and is of the undefined structure; when the molybdenum disulfide is used as a catalyst of water-photocatalytic-decomposition hydrogen production, a large number of active sites are provided for photoelectron and hydrogen ions in water reacting, and therefore the catalytic activity is improved. The molybdenum disulfide-cadmium sulfide nanometer composite material is used as the catalyst, and has the multiple advantages of being simple in method, low in cost, high in catalytic activity and the like.

The invention discloses a preparation method of a graphite phase carbon nitride/rutile monocrystal titanium dioxide (TiO2) nanowire array. The preparation method is characterized by comprising the following steps: (a) dissolving a cyanamide compound or urea in a solution, immersing the prepared rutile monocrystal TiO2 nanowire array into the obtained cyanamide compound or urea solution, and then taking out and drying the nanowire array; and (b) performing heat treatment on the dried nanowire array to finally obtain the graphite phase carbon nitride/rutile monocrystal TiO2 nanowire array. The preparation method has the advantages of simple process and low cost, thus being applicable to large-scale industrial production; and the prepared graphite phase carbon nitride/rutile monocrystal TiO2 nanowire array has good visible light response activity, and can be widely applied to the fields such as photocatalysis, hydrogen production by photocatalytic decomposition of water, photoelectric conversion and the like.

The invention discloses low-odor low-volatilization modified polypropylene material and a preparation method thereof. The low-odor low-volatilization modified polypropylene material is composed of the following raw materials by weight, polypropylene 65-89%, low-odor low-volatilization absorbent 0.5-3%, inorganic filler 5-15%, polyolefin elastomer (POE) flexibilizer 5-15% and antioxygen 0.1-2%. The low-odor low-volatilization modified polypropylene material has the advantages that nano-zinc oxide which is prepared by a microemulsion method is used for preparing nano-zinc oxide modified active carbon materials and loaded on the surface of multihole active carbon, residual monomers, decomposers and organic acid in base materials of polypropylene are effectively absorbed, obvious effect of absorbing odor is achieved, preparing process is simple, and production cost in low.

The invention relates to an atom dispersion water oxidation catalyst and a preparation method and application thereof. The method comprises the steps that firstly, metal ions and nonmetal atoms are embedded into a carbon-based material framework; and generated oxides are removed through acid treatment, so that the atom dispersion catalyst is obtained. By means of the method, the dispersive atom catalyst containing the metal ions such as vanadium, chromium, manganese, iron, cobalt, nickel, copper, ruthenium, palladium, silver, cadmium, iridium and lead can be prepared. The metal ions in a material synthesized through the method are mainly embedded into the framework of a carbon-based carrier in the form of single atoms, and the metal loading amount can reach 1.5% or above by weight. The catalytic performance of the atom dispersion catalytic material prepared through the method can compare favorably with that of PSII in the nature; the preparation cost is low; and the wide application prospect can be achieved in the processes of water decomposition conducted through electro-catalysis, water decomposition conducted through photoelectrocatalysis, water decomposition conducted through photo-catalysis and manual photosynthesis carbon dioxide reduction and conversion.

The invention relates to a BiOI-graphene visible light catalyst and a preparation method thereof, belonging to the technical field of inorganic material synthesis and photocatalysis. BiOI and graphene are in the shape of a slice, and the graphene is 1.0%-3.0% by weight. The preparation method of the BiOI-graphene visible light catalyst comprises the following steps of: firstly ultrasonically dispersing graphite oxides into ethanol; then stirring, and adding a certain amount of sodium iodide or potassium iodide water solutions and bismuth nitrate glacial acetic acid solutions at the same time; transferring suspending liquid into a high-pressure reaction kettle with a polytetrafluoroethylene liner, and carrying out crystallization reaction at 120-150 DEG C for 6-12 hours; filtering, washing and drying obtain solid products so as to finally obtain the BiOI-graphene compound light catalyst. The preparation method has environment friendliness and simple process; and the prepared BiOI-graphene visible light catalyst has very high visible light catalytic activity and potential application value in a control technology decomposing organic pollutants by utilizing solar photocatalysis.

The invention belongs to the technical field of photocatalysis, and discloses a graphene composite photocatalyst which is compounded from graphene and a semiconductor photocatalysis material, a preparation method and application thereof. The graphene composite photocatalyst is a composite photocatalysis material with a surface heterogeneous structure and comprises a graphene lamella and the semiconductor photocatalyst packaged by the graphene lamella. The graphene composite photocatalyst is prepared by a double-solvent photocatalytic reduction method adopting deionized water and a reducing alcohol agent, wherein the reduction of the graphene and the formation of a heterogeneous junction structure are finished by one step; the process is simple and convenient; and reagents are cheap. The catalyst has the characteristics of high adsorbability and high photocatalytic oxidative activity, is used for environment improvement and solar conversion and utilization such as air purification, sewage treatment, photocatalytic decomposition of water to prepare hydrogen, photocatalytic reduction of CO2 to synthesize alcohols, hydrocarbon fuels and the like.

The invention discloses a CdS quantum dot/superthin g-C3N4 nanosheet composite photocatalyst and a preparation method thereof. CdS quantum dot/superthin g-C3N4 is a composite visible light catalyst formed by loading CdS quantum dots on a superthin g-C3N4 nanosheet. Compared with a pure g-C3N4 catalyst, the CdS quantum dot/superthin g-C3N4 photocatalyst prepared by the preparation method disclosed by the invention is higher in photocatalyst activity; under the irradiation of visible light, the hydrogen production efficiency of the catalyst by photocatalytic decomposition reaches 998mu molh<-1>g<-1>. The CdS quantum dot/superthin g-C3N4 nanosheet composite photocatalyst and the preparation method thereof disclosed by the invention have the advantages that raw materials are low in price and easily obtained, an experiment method is simple, and the catalyst is wide in light response range and high in photocatalytic efficiency. The material is matched with other materials to form a corresponding photocatalytic device; the CdS quantum dot/superthin g-C3N4 nanosheet composite photocatalyst has good potential application prospect of promoting the industrial development of the solar scale hydrogen production technology and solar catalytic oxidation and synthesis.

The invention discloses a preparation method of a molybdenum disulfide/titanium dioxide composite material with a nano thorn hierarchical structure, relates to the preparation method of the molybdenum disulfide/titanium dioxide composite material with the nano thorn hierarchical structure, and aims at solving the problem of low photocatalytic activity of traditional single titanium dioxide photocatalyst. The method comprises concrete steps of: 1, stripping flaky molybdenum disulfide; 2, preparing a dry product; 3, heating and burning the dry product under protection of an inert atmosphere, and then cooling to room temperature, so as to obtain the molybdenum disulfide/titanium dioxide composite material with the nano thorn hierarchical structure. The molybdenum disulfide/titanium dioxide composite material with the nano thorn hierarchical structure prepared by the method has good stability, and high photocatalytic activity, and is suitable for being used as a photocatalytic decomposed aquatic hydrogen catalyst and a dye-sensitized solar cell electrode material. The preparation method is applied to the field of a chemical industry.

The invention discloses a visible-light-induced photocatalyst loaded with four vanadium tetrasulfide (VS4) active component and a preparation method and belongs to the technical field of photocatalytic techniques. Graphene, carbon nano tube and silver sulfide are used as template carriers to improve the photocatalytic activity. The photocatalyst takes VS4 as the active component and the carbon nano tube as a carrier, and is prepared through a solvothermal method. The result shows that the prepared composite photocatalyst has good response at the visible light area and can effectively carry out water photolysis reaction; the success of the preparation of the photocatalyst has a certain theoretical and practical significance on sewage photocatalytic decomposition and hydrogen preparation through water photodecomposition for solving energy crisis.

The invention relates to a visible light-response photo-catalyst material of AgTO2 composite oxide, whose formula is presented by the AgTO2 as composite oxide semiconductor (wherein, T presents Al, Ga, In, Cr, Fe, Co, Ni). And its properties can be modified by doping oxide, hydrate, organic salt and inorganic salt of the metals as alkali metals, alkaline-earth metals, transient metal, Ge, Sn, Pb, Sb or Bi as raw material, while the doping mount is 0.1-20% (mass fraction). Said composite oxide semiconductor can decompose harmful chemical material via photo-catalyst while it is characterized in that it can effectively decompose and remove the harmful chemical material in the radiation of ultraviolet light and visible light.

The invention belongs to the technical field of semiconductor photocatalysis, and in particular relates to a sulfur doped graphite phase carbon nitride pholocatalyst and application thereof in photocatalysis TCP (2,4,6-trichlorophenol) degradation reaction and photocatalysis hydrogen preparation reaction. A dielectric barrier discharge plasma generator is adopted, and H2S is used as a discharge gas to perform discharge treatment on a graphite phase carbon nitride catalyst. The sulfur species have high activity under a plasma state, so that compared with a conventional preparation method, graphite phase carbon nitride catalysts can be doped more easily. The sulfur doped graphite phase carbon nitride pholocatalyst provided by the invention has the advantages that the sulfur doped amount is adjustable, the specific area of a product catalyst is large, the visible light absorbability is strong, the electron-hole separation efficiency is high, and the photocatalysis performance is good. The catalyst prepared by the method provided by the invention is applied to a photocatalysis degradation process of a common pollutant namely 2,4,6-trichlorophenol (TCP) and a photocatalysis water decomposition hydrogen preparation process, the same evaluation device is adopted, and compared with the sulfur doped graphite phase carbon nitride pholocatalyst prepared by a conventional method, the sulfur doped graphite phase carbon nitride pholocatalyst provided by the invention shows more superior catalytic activity.

The invention discloses a visible-light-induced photocatalyst Bi4O5Br2 and a preparation method thereof. According to the visible-light-induced photocatalyst Bi4O5Br2 and the preparation method thereof, an improved low-temperature hydrothermal method is adopted, composition of Bi, O and Br in BiOX is controlled by controlling amount of a bismuth source and a bromine source, and a novel layered-cake-shaped visible-light-induced photocatalyst Bi4O5Br2 is prepared successfully. The preparation method is simple in production process, easy to operate, low in synthesis temperature, high in reaction yield, environment-friendly and low in cost and meets the requirement of actual production, the reaction yield is 92%, and raw materials are easy to obtain. The visible-light-induced photocatalyst has good visible-light catalytic activity, can completely degrade various organic pollutants such as rhodamine b, methyl orange and methylene blue in short time under the visible light irradiation, is small in light corrosion and good in reusability, can be applied to industrial production and particularly has a better application value in organic pollutant degradation through solar photocatalysis, and the market potential is large.

The invention aims to create a simple and convenient preparation method for a nickle/graphene-like carbon nitride compound composite catalyst for solving problems of environment pollution, energy crisis and the like at present, lowering the cost of a photocatalyst and increasing the rate of photocatalytic hydrogen production. The preparation method of the composite catalyst is green and environmental-friendly, the principle of the composite catalyst is that a graphene-like carbon nitride compound is taken as a photosensitizer, and the nickle monomer/graphene-like carbon nitride compound composite catalyst is prepared by reducing nickle ions by using a photo-reduction method. The nickle monomer/graphene-like carbon nitride compound composite catalyst provided by the invention is simple and convenient in synthesis method, high in photocatalysis hydrogen production rate, good in stability, low in price, non-toxic and environmental-friendly, and is a novel catalytic material with relatively large industrial photocatalysis hydrogen production prospects, and the cost can be greatly lowered if the catalyst is used in industrial production.

The invention discloses a preparation method and application of a potassium-doped carbon nitride photocatalyst. The method comprises steps as follows: ammonium chloride, dicyandiamide and potassium nitrate are mixed, and the mixture is heated to 500-600 DEG C and then kept at the constant temperature for 3-6 h; the mixture is naturally cooled to the room temperature after calcination ends, and thepotassium-doped carbon nitride photocatalyst can be obtained. The potassium-doped carbon nitride photocatalyst is used for photocatalytic decomposition of organic matter. The prepared photocatalyst has larger interlayer spacing and specific surface area and excellent photocatalytic activity, the degradation efficiency is two times or more that of pure carbon nitride in the degradation experimentof the organic matter, and the preparation method is simple and feasible, has lower requirements for experiment facilities and can save the preparation cost to the greatest extent.

The invention relates to preparation of a non-noble metal cocatalyst CoP, in particular to a study on properties of a CoP/CdS composite photocatalyst on photocatalytic decomposition of hydrogen from water. The CoP/CdS composite photocatalyst is formed by supporting the cocatalyst CoP on CdS according to a certain proportion. The preparation comprises the following specific steps: (1) synthesizing a CoP precursor, (2) phosphorizing the CoP precursor synthesized in the step (1), and (3) compounding CoP and CdS through a coprecipitation method. The CoP/CdS composite photocatalyst disclosed by the invention has higher photocatalytic decomposition activity of hydrogen from water, wherein the photocatalytic activity of the CdS/CoP composite photocatalyst is 7 times more than that of pure CdS when the optimum load is supported.

The present invention relates to one kind of photocatalyst for high efficiency visible light catalysis to decompose H2S for preparing H2. The photocatalyst has the composition of MI(x)+MIIS(z)/Cd1-yZnyS, where, MI is noble Ru, Rh, Ir, Pt and/or Au, x is 0-0.05, y is 0-0.5, MII is one of Pd, Mo and W, and z is 0-0.2. The catalyst is high crystallized nanometer particle of D50 in 10-70 nm.

The invention discloses a catalyst of semiconductor nano particles/ N-doped graphene compound, and a preparation method thereof, and the catalyst is used for decomposing water in a photocatalysis mode. NGR is used as a carrier, tetrabutyl titanate is used as the raw material, TiO2 nano particles are loaded on the surface of the NGR in a solvothermal method, after cleaning and drying, TiO2/NGR compounds with the TiO2 nano particles evenly distributed on the two-dimensional plane of the NGR are obtained, a few of Pt nano particles are loaded on the TiO2/NGR compounds in a photo-deposition method, and the TiO2/NGR/Pt three-component photocatalyst is obtained. Compared with a compound prepared by pure TiO2 nano particles or reduction-oxidation graphene and TiO2 nano particles, the photocatalyst prepared in the novel method has the advantages that the partical size of each TiO2 nano particle is small, distribution is even, catalytic activity is high, stability is good, and using cycle is long.

The invention discloses a dried persimmon-shaped visible-light-driven photocatalyst BiOBr and a preparation method thereof. The inventor adopts a low-temperature solvothermal method, controls the morphology of a halogen-bismuth-oxide visible-light-driven photocatalyst by controlling the dosage of a bismuth source and a bromine source and adding a structure guiding agent, and successfully prepares the novel efficient visible-light-driven photocatalyst BiOBr with novel and special morphology, the dried persimmon shape, for the first time. The preparation method disclosed by the invention is simple in overall production technology, easy to operate, low in synthesis temperature, high in reaction yield (89%), friendly to environment and low in cost, and accords with the requirements of practical production, and the raw materials are readily available. The visible-light-driven photocatalyst disclosed by the invention has good visible-light catalytic activity, can completely degrade a plurality of organic pollutants (such as methylthionine chloride and methyl orange) within a short period of time under irradiation of visible light, is small in light corrosivity, good in reusability and large in market potential, can be applied to industrial production, and especially has good application value in photocatalytic decomposition of organic pollutants by solar energy.

The invention discloses a method for preparing 2,5-furandicarboxylic acid by photocatalysis of 5-hydroxymethyl furfural. 5-hydroxymethyl furfural is used as a raw material, a photocatalytic catalyst is utilized, water is used as a solvent, under light conditions, oxygen or hydrogen peroxide produced by water is catalyzed and decomposed by light to be an oxidant, and 5-hydroxymethyl furfural is selectively oxidized to prepare 2,5-furandicarboxylic acid. A reaction system is environment-friendly, green and pollution-free; 2,5-furandicarboxylic acid can be efficiently and selectively synthesized at low temperature, and the conversion rate of the 5-hydroxymethyl furfural reaches 90% or above.