124results about How to "Reduce photocatalytic activity" patented technology

An omnidirectional structural color pigment having a protective coating. The pigment has a first layer of a first material and a second layer of a second material, the second layer extending across the first layer. In addition, the pigment reflects a band of electromagnetic radiation having a predetermined full width at half maximum (FWHM) of less than 300 nm and a predetermined color shift of less than 30° when the pigment is exposed to broadband electromagnetic radiation and viewed from angles between 0 and 45°. The pigment has a weather resistant coating that covers an outer surface thereof and reduces a relative photocatalytic activity of the pigment by at least 50%.

This invention relates to a method for preparing titanium dioxide nanowires. The method uses titanium dioxide powder as the raw material, and performing hydrothermal reaction to obtain titanium dioxide nanowires. The obtained titanium dioxide nanowires have high activity in photodegradation of organic pollutants and can be recovered easily for recycling.

Provided are a silica-coated mixed crystal oxide particle which has high dispersibility, excellent visible light transparency and superior ultraviolet-shielding capability and which is sufficiently reduced in the photocatalytic activity; an economical production process thereof; and an ultraviolet-shielding cosmetic material containing the silica-coated mixed crystal oxide particle, which is particularly excellent in the visible light transparency. The surface of a mixed crystal oxide particle having a BET specific surface area of 10 to 200 m<2> / g and containing primary particles in a mixed crystal is covered with a dense and thin film silica.

The invention belongs to the field of fine chemicals, and relates to a method for preparing a water-based ultraviolet barrier coating with ZnO quantum dots (QDs). The method comprises the steps that ethanol solutions of zinc salt and lithium hydroxide are subjected to a sol-gel reaction; the ZnO QDs are prepared; ethyl orthosilicate serves as a raw material; the surfaces of the ZnO QDs are coated with a layer of silicon dioxide in situ; ZnO QDs@SiO2 kernel-shell nano particles with the photocatalytic activity inhibited effectively are formed, transferred into water, and composited with water-based film forming resin and a wetting agent; and the water-based ultraviolet barrier coating is formed. The content of ZnO QDs@SiO2 in a dry film is 1-50%, and overall barrier of ultraviolet rays with wavelengths less than 340nm is achieved by adjusting the thickness of the film and the content of ZnO QDs@SiO2. According to the method, the ultraviolet barrier coating is water-based, environment-friendly and non-toxic, is applicable to outdoor bamboo, wood, plastic and the like, and can be used for preparing transparent ultraviolet barrier glass.

This invention provides a coating composition that can form a coating film having an eliminated or reduced photocatalytic action-derived deterioration and can form a coating film having a lowered haze value, has excellent dispersibility and dispersion stability in a coating liquid form, has excellent storage stability, and also has excellent coatability. The coating composition is characterized by comprising at least the following four components (1) to (4): (1) titanium dioxide fine particles with eliminated or reduced photocatalytic activity which is obtained by surface treating titanium dioxide fine particles doped with cobalt capable of capturing free electrons and / or holes, with a zinc chelate compound capable of capturing free electrons and / or holes, (2) a binder component, (3) a dispersant, and (4) an organic solvent.

The invention belongs to the technical field of titanium dioxide and in particular relates to titanium dioxide with high weather resistance and a preparation method thereof. In order to solve the problems that a titanium dioxide film prepared in the prior art is not compact, poor in weather resistance and the like, the invention provides the titanium dioxide with high weather resistance. The method comprises the following steps: a, adding a dispersing agent into titanium dioxide slurry, then adding an aluminum raw material and curing the mixture to obtain titanium dioxide slurry coating aluminum oxide; b, adding an acid into the titanium dioxide slurry obtained in the step a to adjust the pH to 0.1-3.0 and then adding sodium silicate and an acid to cure; and c, adding the titanium dioxide slurry obtained in the step b into the aluminum raw material, and curing, filtering, washing, drying and micro-crushing and organically treating the mixture to obtain the titanium dioxide with high weather resistance. The titanium dioxide with three coating films prepared by the method is good in film compactness and high in weather resistance, and the preparation method is simple to operate and convenient to popularize and implement.

The invention provides a preparation method of weather-resistant titanium dioxide. The method includes doping metatitanic acid subjected to bleaching and secondary washing. The doping method includes sequentially adding water solution of phosphorus compound, magnesium compound, stibium compound, aluminum compound, lithium compound and potassium compound, and well mixing. By the method, iron content in the titanium dioxide is lowered, the prepared titanium dioxide is good in each quality index, and photocatalytic activity is lowered greatly.

The invention discloses a fire-retardant coating with photo-catalytic performance and a preparation method thereof, belonging to the field of fire-retardant coatings. The coating comprises a base material, a catalyst, a charring agent, a foaming agent, a filler, a pigment, a solvent, a dispersant, a drier, a drying aid, a nano mother solution and the like, wherein the base material is aluminum dihydrogen phosphate, the catalyst is ammonium polyphosphate, the charring agent is pentaerythritol, the foaming agent is melamine, the filler is ultra-fine slag powder, the pigment is Cu-La / TiO2, the solvent is water, the dispersant is a BYK180 polymeric dispersant, the drier is lead oxide, the drying aid is zinc powder, and the nano mother solution is a nano SiO2 mother solution. The fire-retardant coating disclosed by the invention reduces the environment pollution to the maximum extent by using industrial waste residues as the filler; meanwhile, the coating has a function of realizing photocatalytic degradation of formaldehyde gas under a visible light source to endow conventional fire-retardant coatings with a brand-new function, and the fire-retardant coating accords with the development trend of national green ecological building materials.

The invention relates to a method for processing the inorganic surface of nanometer zinc oxide, and belongs to the field of nanometer materials. The method for processing the inorganic surface of the nanometer zinc oxide comprises the following steps: cladding aluminum phosphate on the surface of the nanometer zinc oxide; then cladding silicon oxide; filtering and washing the paste of the nanometer zinc oxide, so that the electric conductivity of filtrate is less than 300 Mu S / cm; drying the filtrate; and obtaining nanometer zinc oxide composite powder after the filtrate is crushed. The method has short process flow, convenient operation and easy control. The nanometer zinc oxide composite powder prepared has the advantages of excellent light stability, small dissolution rate of zinc ion and good dispersivity.

The embodiment of the application provides a bismuth-amorphous bismuth tungstate-bismuth trioxide ternary organic composite photocatalyst and a preparation method thereof. The preparation method comprises the following steps: dissolving a precursor of bismuth in deionized water to obtain a bismuth solution, and dissolving a precursor of tungstateradicle in deionized water to obtain a tungstateradicle solution; uniforming mixing the bismuth solution and the tungstateradicle solution, and performing a thermostatic reaction in a drying oven to obtain amorphous bismuth tungstate powder; and respectively dissolving a reducing agent and the amorphous bismuth tungstate powder in deionized water, performing mixing and magnetic stirring under the room temperature, and adopting an in-situ deposition method to obtain the bismuth-amorphous bismuth tungstate-bismuth trioxide ternary organic composite photocatalyst. In the organic composite photocatalyst obtained by adoption of the preparation method, the simple substance Bi is loaded on the surface of bismuth tungstate in situ and forms a heterojunction together with an oxide Bi2O3 of the simple substance Bi, so that separation of photo-induced electrons from electron-hole pairs of amorphous bismuth tungstate is quickened to the utmost extent, and furthermore, the photocatalytic activity of the ternary organic composite photocatalyst is improved.

The invention discloses a photocatalyst and a preparing method thereof. The photocatalyst is prepared from, by weight, 78-85 parts of nanometer titania, 8-15 parts of nanosilicon dioxide, 0.5-2.5 parts of cerium and lanthanum composite rare earth material and 1-4.5 parts of nanometer silver-zinc antibacterial agent. The preparing method includes the steps of preparing titanium dioxide sol, preparing silicon dioxide sol, mixing the titanium dioxide sol and the silicon dioxide sol, preparing the cerium and lanthanum composite rare earth material, preparing the nanometer silver-zinc antibacterial agent, adding the nanometer silver-zinc antibacterial agent and the cerium and lanthanum composite rare earth material and conducting ageing, drying, grinding and sintering. The photocatalyst is applied in building materials, is adsorbed to the surface of an object to form a stable coating according to the nanometer characteristic of the solidified photocatalyst, effectively restrains bacteria and purifies air and is long lasting in effect and not corrosive to the building materials. It is found through research that the antibacterial performance of the photocatalyst can be easily improved due to the doping of rare earth elements and the nanometer silver-zinc antibacterial agent.

The invention relates to a manufacture method for an anti-ultraviolet nanometer zinc oxide compound powder. It includes the following steps: mixing nanometer zinc oxide powder with dispersing agent, and deionized water; using silicate as raw material, by controlling the pH value of reacting liquid, taking silicon dioxide surface modification; taking organic modification to the surface, after washing and drying, the nanometer zinc oxide compound powder would be gained. The invention has the advantages of simple technology, low cost, strong repeatability, etc. It has bright application prospect.

There is provided a photocatalyst sheet comprising a base material and a photocatalyst layer containing at least a photocatalyst, wherein the photocatalyst layer is firmly adhered to the base material. In an embodiment, there is provided a photocatalyst sheet comprising a base material; and a photocatalyst layer that contains at least a photocatalyst, and is formed on at least one surface of the base material through an aerosol deposition method. This photocatalyst sheet has an excellent photocatalytic activity and an excellent adhesion.

A nano-titanium dioxide fabric finishing agent with the surface coated with cerium-doped zinc oxide is characterized by being prepared by the following steps: firstly, hydrolyzing and depositing cerium chloride and zinc chloride on the surface of nano-titanium dioxide to obtain the nano-titanium dioxide with the surface coated with the cerium-doped zinc oxide, and performing surface treatment by acoupling agent KH-550 to obtain organic silicon modified ultraviolet-resistant granules; secondly, performing polymerization on hydroxyethyl acrylate, acrylic acid and butyl acrylate to obtain polyacrylic acid emulsion; finally, preparing aqueous dispersion of the organic silicon modified ultraviolet-resistant granules and coating with the polyacrylic acid emulsion, to obtain the nano-titanium dioxide fabric finishing agent with the surface coated with cerium-doped zinc oxide. The fabric finishing agent provided by the invention has high stability; after being finished, the fabric has excellent ultraviolet-resistant effect, high durability and soft hand feeling.

The invention discloses a fire retardant coating with photocatalytic performance and a preparation method thereof. The fire retardant coating is obtained by mixing and stirring a base material, a catalyst, a charring agent, a foaming agent, filler, a pigment, a solvent, a disperser, a dryer, a drying aid and a nano-mother solution. By adopting the preparation method provided by the invention, the environment pollution can be furthest reduced, the recycling economical production of the product can be realized and about 20% of the cost can be reduced; the fire retardant coating prepared by the invention has excellent performances of high strength, rapid hardness, washing resistance, water resistance, alkali resistance and freezing resistance, particularly has an outstanding feature of degrading the formaldehyde gas in the room through photocatalysis and has a natural, non-toxic, pollution-free environment-friendly safety performance.

A highly active titanium oxide photocatalyst of the type responsive to visible light is prepared by subjecting a titanium (hydr)oxide raw material obtained by neutralizing an acidic titanium compound in ammonia or an amine under conditions such that the final pH is 7 or below to heat treatment in an atmosphere containing a hydrolyzable compound followed by contact with water and additional heat treatment at a temperature of at least 350° C. The resulting titanium oxide photocatalyst comprises titanium oxide with a specific surface area of at most 120 m2 / g and with the amount of surface hydroxyl groups being at least 600 μeq / g. Preferably the density of surface hydroxyl groups is at least 8 μeq / m2, and the ratio of the amount of terminal type hydroxyl groups (T) to the amount of bridge type hydroxyl groups (B) in the surface hydroxyl groups satisfies T / B≧0.20. This titanium oxide photocatalyst has an ESR spectrum having two types of triplet signal for which the g values of the main spectra are 1.993-2.003 and 2.003-2.011, respectively, and it is also identified by having ratios of the strengths of these signals before irradiation with visible light, under irradiation, and immediately after the stop of irradiation which are different from conventional products.

The invention belongs to the environmental material preparation technical field, and relates to a preparation method of a photodegraded enrofloxacin hydrochloride floating type magnetic conductive surface molecular imprinting composite photocatalyst and an application. According to the invention, fly ash is modified, the floating type carboxyl modified fly ash hollow microspheres can be prepared, chitosan is used to perform a crosslinking preparation on magnetic Fe3O4 nano-particles to prepare the magnetic fly ash hollow microspheres, a sol-gel method is used to prepare the TiO2@magnetic fly ash hollow microspheres photocatalyst through photo-initiation polymerization, and the fly ash hollow microspheres photocatalyst is performed with ultrasonic modification, the template molecule enrofloxacin hydrochloride is added for photo polymerization, and is eluted, and leached by absolute ethyl alcohol and then dried. The prepared floating type magnetic conductive surface molecular imprinting composite photocatalyst can be used for degrading the enrofloxacin hydrochloride; the surface molecular imprinting composite photocatalyst has high selectivity on enrofloxacin hydrochloride after photocatalytic degradation no matter in a single-phase antibiotic solution or in a binary mixed phase antibiotic solution; and the magnetic separation characteristic enables convenience and high efficiency for separating and recovering.

The invention discloses a self-cleaning antifouling organic-inorganic super-amphiphobic polymer coating which is prepared from the following raw materials: perfluoroalkyl ethanol, methyl isobutyl ketone, HDI trimer, methyl methacrylate, styrene, hydroxyethyl methacrylate, perfluorooctyl methacrylate, benzoyl peroxide, 25-28 parts of methanol silica sol, propylene glycol methyl ether acetate, titanium dioxide, sodium hexametaphosphate, ethyl orthosilicate, vinyl triethoxysilane, an appropriate amount of ammonia water, an appropriate amount of silane coupling agent KH570, an appropriate amount of methyl hydroxyl silicone oil, an appropriate amount of 10% dibutyltin dilaurate, a dispersant, a leveling agent, a defoamer, an appropriate amount of butyl acetate, an appropriate amount of anhydrous ethanol, and an appropriate amount of deionized water. The super-amphiphobic polymer coating provided by the invention is simple and feasible in preparation method, can be firmly combined with a variety of substrates, and has universality, good self-cleaning performance, dirt resistance, scrub resistance, corrosion resistance and other performance, and good application prospects.

The present invention provides surface-modified silica-coated metal oxide particles having low structure and prepared by adding, with stirring, a base dissolved in water to a dispersion comprising Metal oxide, at least one XnSi(OR) 4-n type compound and water; separation; optionally rinsing with water; drying; and surface modification of the reaction product. The surface-modified silica-coated metal oxide particles can be used in sunscreen and CMP applications.

The present invention relates to liquid phase process of preparing anatase phase nano crystal titanium dioxide at the temperature range of room temperature to 120 deg.c. The process includes the alkali alkaline hydrolysis of hydrated titanium dioxide as main material, cooling, adding crystal kernel promoter, water washing, acid dissolving and cooling to obtain titanium dioxide slurry with photocatalytic activity; and further washing, filtering, drying and crushing to obtain anatase phase nano crystal titanium dioxide with photocatalytic activity. The nano crystal titanium dioxide has average granularity of 10-80 nm, specific surface area of 150-300 sq m / g, powerful surface adsorption capacity, very high photocatalytic activity and organic matter degrading capacity much higher than available similar marketable products.

The invention discloses a preparation method of a TiO2 / MnS / Ga2O3 composite photocatalyst colloid. The method comprises the following steps: 1) synthesis of s TiO2 sol; 2) synthesis of a Ga2O3 sol; 3) synthesis of MnS4; and 4) synthesis of the TiO2 flocculent / MnS / Ga2O3 composite photocatalytic colloid; and mixing of the TiO2 sol and Ga2O3 sol obtained in the step 1) and step 2). The solid TiO2 TiO2 / MnS / Ga2O3 composite photocatalyst colloid after drying contains 90.0-97.0wt% of TiO2, 2.9-8.0wt% of MnS, and 0.1-2.0wt% of Ga2O3. The composite photocatalyst colloid has high solar light utilization rate and catalytic oxidation ability.

There is provided a titanium hydroxide having a nitrogen content of 2.3% by weight or more in terms of nitrogen atom based on the titanium hydroxide and / or having a nitrogen content of about 3.3% by weight or more in terms of nitrogen atom based on the titanium oxide obtained after calcining the titanium hydroxide in air at about 400° C. The titanium hydroxide may be utilized as a raw material for producing a photocatalyst which exhibits a superior photocatalytic activity by irradiation of visible light.

Melamine grafting modified polyurethane plastic is characterized by being prepared from the following steps: firstly grafting melamine with polyether polyol to obtain a polyol compound; prepolymerizing the synthesized polyol compound and toluene diisocynate and filling organosilicone modified uvioresistant particles to obtain a prepolymer; adding a curing agent into the prepolymer, pouring, defoaming, and curing to obtain the melamine grafting modified polyurethane plastic. The polyurethane plastic has good elasticity, excellent wear resistance and illumination aging resistance and good flame-retarding effect.

The invention discloses a preparation method, product and application of BiOI / WO3 heterojunction efficient photoelectrocatalysis electrodes, and particularly relates to that a hydrothermal method is adopted firstly. WO3 films grow in situ on FTO, bismuth nitrate, potassium iodide, anhydrous ethanol and p-benzoquinone are used for preparing an electro-deposition solution according to certain raw material ratio, the electrodeposition of the BiOI is conducted on the WO3 in the electro-deposition solution to prepare the BiOI / WO3 heterojunction photoelectrocatalysis electrodes. By changing the timeof electrodeposition, BiOI / WO3 heterojunction electrodes with different shapes and thicknesses are obtained. According to the preparation method of the BiOI / WO3 heterojunction efficient photoelectrocatalysis electrodes, the prepared BiOI / WO3 heterojunction electrodes have higher activity of photoelectrocatalysis degradation of organic wastewater than pure WO3, and the preparation method has the characteristics of easy availability of raw materials, simple production processes, and the like, the heterojunction photoelectrocatalysis electrodes can be used circularly without causing secondary pollution.

The invention relates to a preparation method of an ultraviolet screening agent, and belongs to the technical field of inorganic nanometer composite materials. The preparation method comprises the steps that tetrabutyl titanate and ethanol solution are mixed and heated, and after the pH value is adjusted by an acetate solution, aging is conducted to obtain a mixed sol; the mixed sol is subjected to calcination, ball grinding and sieving, and nanometer titanium dioxide powder is obtained; raw materials, such as tetrapropylammonium hydroxide and deionized water, are mixed and heated and subjected to centrifugalization, and lower-layered precipitates are collected, then washed and dried, and mixed and subjected to ball grinding with indium tin oxide; the ball-grinding powder and absolute ethyl alcohol are mixed and dispersed, and a modified dispersion liquid is obtained; the modified dispersion liquid and the prepared nanometer titanium dioxide powder are mixed, heated and filtered, a filter cake is subjected to drying, calcination, grinding and sieving, and the product is obtained. The prepared ultraviolet screening agent can absorb ultraviolet light effectively and lowers photocatalytic activity greatly, and the ultraviolet screening rate can reach 96.5% or above.

An object of the present invention is to produce core-shell structured metal oxide particles having a high refractive index and low photocatalytic activity. For this purpose, a method for producing core-shell structured metal oxide particles is provided in which shells composed of a metal oxide are formed on surfaces of core particles while exposing the core particles to light having the intensity of 0.1 mW / cm2 or more.

The invention discloses a preparation method of rear earth europium doped hollow nano TiO2 glass micro beads. The preparation method of the rear earth europium doped hollow nano TiO2 glass micro beads comprises the following steps: firstly, coating surfaces of hollow glass micro beads with magnetic nano Fe3O4 by ferric sulfate, sodium thiosulfate, urea, polyethylene glycol-1000; then coating a SiO2 intermediate layer with tetraethoxysilane, and finally coating a europium doped nano TiO2 photocatalyst by titanous sulfate, the urea, polyvinylpyrrolidone and europium nitrate, so as to obtain the rear earth element doped hollow magnetic photocatalysis glass micro beads with core-shell structures. By adopting the preparation method, the rear earth europium doped hollow nano TiO2 glass micro beads has the excellent magnetic performance on the premise of not reducing the photocatalysis activity of TiO2.

The invention discloses ultraviolet-resistant cerium oxide coated nano zinc oxide powder and composite paint comprising the ultraviolet-resistant cerium oxide coated nano zinc oxide powder. Because of high photocatalytic activity of existing nano zinc oxide, degradation of an organic coating will be accelerated, and the weather resistance of the coating is reduced. The ultraviolet-resistant cerium oxide coated nano zinc oxide powder is prepared through a chemical precipitation synthesis method, and the thickness of a cerium oxide coating in the nano zinc oxide powder is 5-10 nm. The ultraviolet-resistant cerium oxide coated nano zinc oxide powder is added in the paint, the photocatalytic activity of nano zinc oxide is reduced in the mode that the nano zinc oxide is coated with cerium oxide, and the ultraviolet resistance and the ageing resistance of the coating are improved.