97 results about "Brookite" patented technology

Adsorbents and Methods used for effective removal or concentration or retention and recovery of harmful or valuable dissolved ions and compounds from aqueous systems using quantum size effect on large band gap semiconductors are provided. This invention provides methods for creating surface hydroxyl groups on surfaces of anatase, brookite and rutile large band gap semiconductors which comprise methods of reducing dimensions of individual crystals to the sizes where surface hydroxyl groups are self generated via quantum size effects when they contacted with electrolytes. This invention also provides methods of reproducible preparation of quantum sized effected anatase, brookite and rutile, which comprise in non-batch and continues process in which growth of said crystals is aborted. The invention also provides methods using quantum size effected anatase, brookite and rutile products for treatment of water, comprising rapid and high capacity adsorption of dissolved molecules and ions to the surface of said crystals via surface reaction process between said effect created hydroxyl groups with molecules and ions. Invention in general provides an effective means for treatment of water from harmful contaminants, especially As, P, U, transuranic elements, W, Mo, Cu, Pb, Cd, Co, Ni, Cr and others

Disclosed is a process for producing a glass ceramics which has a surface having excellent durability and has at least one titanium oxide crystal phase selected from those of anatase type, rutile type and brookite type. Also disclosed are a molded article having a photocatalytic function and a hydrophilic molded article each of which comprises the glass ceramics produced by the process. The glass ceramics comprises 15.0 to 95.0% by mol inclusive of a TiO2 component and 3.0 to 85.0% by mol inclusive of a P2O5 component and / or an SiO2 component in terms of oxide contents relative to the total amount of the glass ceramics.

The invention relates to a preparation method of carbon-based titanium dioxide composite material of complex porous structure. Based on the synthetic technology of biological templates, the method comprises the steps of using pollen as the material of biological templates, conducting ultrasonic pretreatment, then impregnating in titanium dioxide solution for impregnated optimization treatment, then carbonizing the mixture in air in advance and carbonating under nitrogen atmosphere. During the carbonated process, brookite phase titanium dioxide nanocrystal is produced in situ. Finally, a carbon-based brookite phase titanium dioxide composite material with complex porous structure is obtained. The composite material consists of brookite phase titanium dioxide crystal particles with the granularity less than 10nm and carbonized pollen matrix. The technology is simple, the cost is low, and the prepared carbon-based brookite phase titanium dioxide composite material with complex porous structure has favorable application prospect in the fields such as air-sensitive and pressure-sensitive elements, non-linear optical materials, solar cells, environment purification and the like.

YMn2O5 pseudo-brookite compositions with improved thermal stability and catalytic activity as Zero-PGM (ZPGM) catalyst systems for DOC application are disclosed. Testing of YMn2O5 pseudo-brookite catalysts and YMnO3 perovskite catalysts, including variations of calcination temperatures, are performed under DOC light-off (LO) tests at wide range of space velocity to evaluate catalytic performance, especially level of NO oxidation. The presence of YMn2O5 pseudo-brookite oxides in disclosed ZPGM catalyst compositions is analyzed by x-ray diffraction (XRD) analysis. XRD analyses and LO tests confirm that YMn2O5 pseudo-brookite catalysts exhibit higher catalytic activity and significant improved thermal stability when compared to conventional YMnO3 perovskite catalysts.

Adsorbents and Methods used for effective removal or concentration or retention and recovery of harmful or valuable dissolved ions and compounds from aqueous systems using quantum size effect on large band gap semiconductors are provided. Invention provides methods for creating surface hydroxyl groups on surfaces of anatase, brookite and rutile which comprise methods of reducing dimensions of individual crystals to the sizes where surface hydroxyl groups are self generated via quantum size effects when they contacted with electrolytes. This invention also provides methods of preparation of quantum sized anatase, brookite and rutile. The invention also provides methods using quantum size effected anatase, brookite and rutile products for treatment of water, comprising rapid and high capacity adsorption of dissolved molecules and ions to the surface of said crystals via surface reaction process between said effect created hydroxyl groups with molecules and ions.

The invention provides a method for controllably synthesizing pure phase anatase, rutile, brookite titanium dioxide nano-rod. The pure phase anatase, rutile, brookite titanium dioxide nano-rod can be controllably synthesized by controlling the reaction condition of precursor prepared by titanium dioxide powder and alkali solution through a simple hydrothermal method. The method of the invention controllably synthesizes pure phase anatase, rutile, brookite titanium dioxide nano-rod through a simple hydrothermal method at a lower temperature and under a condition without adding any surfactants or templates and has advantages of simply operation, low cost, stable performance, high purity, obvious economic benefit and social benefit which can be synthesized in a large amount.

A food container on which surface titanium oxide particles are fixed, where titanium oxide particles may contain brookite crystals, the material of which the food container is constructed may be stainless steel, and the titanium oxide particles may be bonded using a sintering aid, a binder or both. When the food container is made of glass, satisfactory mechanical strength of the container can be maintained even when the thickness of a wall of the container is reduced. Since titanium oxide particles can be fixed onto a surface of a food container at a temperature as low as 20 to 450° C. by use of a sintering aid, a binder or both thermal deformation of glass forming the food container can be prevented.

The present invention provides hydrothermal processes for the production of titanium dioxide from titanyl hydroxide. The use of specific crystallization directors, or additives, can promote the formation of rutile, anatase, or brookite. Variation of process operating parameters can lead to either pigmentary-sized or nano-sized rutile.

An information recording medium of the present invention includes a recording portion capable of storing information three-dimensionally. The recording portion (3) includes at least one recording layer (1a to 1f), and the recording layer (1a to 1f) contains titanium oxide. It is preferable that titanium oxide is at least one kind of an anatase type and a brookite type. The recording layer (1a to 1f) may be substantially made of titanium oxide, and may contain titanium oxide and a low refractive-index material having a refractive index smaller than that of titanium oxide.

An object of the present invention is to provide a transparent noise-barrier wall which is slow to foul, easy to clean even when fouled, and capable of maintaining these effects over a long period of time. The transparent noise-barrier wall has brookite titanium dioxide substantially existing on the surface. The titanium dioxide particles preferably contain about 20% by mass or more of brookite titanium dioxide.

The invention discloses a highly pure brookite type titanium dioxide nanosheet photocatalysis material, a preparation method thereof, and an application of the photocatalysis material in the photocatalysis field. The above brookite type titanium dioxide nanosheet is prepared through a hydrothermal technique, has the advantages of mild reaction conditions, low reaction temperature, short reaction time, low solution alkalinity, simple synthetic method, cheap and easily available raw materials and the like, and is suitable for large scale production and application. The brookite type titanium dioxide has high photocatalytic activity in an ultraviolet region in hydrogen production through water photolysis or the field of photodegradation of organic dyes.

An aqueous titanium oxide-dispersed sol comprising titanium oxide particles dispersed in water, said sol comprising chloride ions in an amount of 50 to 10,000 ppm by weight as the chlorine element. Titanium tetrachloride is hydrolyzed to form an aqueous titanium oxide-dispersed sol and the chloride ion concentration thereof is controlled. Another aqueous titanium oxide-dispersed sol comprising brookite-type titanium oxide particles dispersed in water, said titanium oxide particles having an average particle size of not more than 0.5 .mu.m and a specific surface area of not less than 20 m.sup.2 / g. Addition of titanium tetrachloride to hot water at 75 to 100.degree. C. followed by hydrolysis at 75.degree. C. to the boiling point of the mixture.

The invention discloses a method for synthesizing an anatase / brookite nano composite material for photocatalytic decomposition of water into hydrogen through a one-step hydrothermal method, and relates to a preparation method for an anatase / brookite nano composite material for photocatalytic decomposition of water into hydrogen. The method is used for solving the difficulties in heterojunction of different crystalline phases of TiO2 and the problems that the recombination probability of a TiO2 photocatalytic material photon-generated carrier is high, the surface active sites are fewer, and the photocatalytic activity is poor as agglomeration is easily generated. The method comprises the following steps: selecting and adding different alkaline solutions and different titanium sources into a water solvent to obtain a mixture, putting the mixture into a hydrothermal kettle to react; then, washing, drying the washed product to obtain the product. Compared with the prior art, the method disclosed by the invention is simple, low in cost and can be used for large-scale synthesis. The prepared anatase / brookite nano composite material forms crystalline phase heterojunction, so that electronic transmission is quickened, the specific surface area is remarkably increased, and the performance of producing water through photocatalytic decomposition under ultraviolet light is good.

The invention relates to the technical fields of material chemistry and photocatalysis, in particular to a method for preparing high-purity brookite titanium dioxide with controlled appearance, which comprises the following steps of: dripping a certain amount of anhydrous sodium acetate into a certain concentration of titanium sulfate solution with stirring, and dripping sodium hydroxide solution to adjust the pH of a mixed suspension system to 8 to 12; and performing a hydro-thermal reaction on a mixed suspension precursor obtained by the reaction in a hydrothermal kettle at the temperature of between 160 and 300 DEG C for 4 to 6 days, taking the precursor out, washing and drying the precursor to obtain the high-purity brookite titanium dioxide. The brookite titanium dioxide which is in petal, spindle and nanotube shapes can be prepared by controlling the pH value of a reaction system and the temperature of the hydro-thermal reaction. The method has the advantages of one-step hydrothermal method, simple operating steps and controlled appearance, high purity, low cost and capability of mass synthesis of products, and has the obvious economic and social benefits.

The invention relates to a method for modulating titanium dioxide crystalline phases by using fluoride ions. According to the method, during the preparation of titanium dioxide by using a hydrothermal method or a solvothermal method, the fluoride ions are added to modulate the titanium dioxide crystalline phases, and the modulation is performed among three phases of rutile, brookite and anatase. The method has the following advantages: phase transformation of the titanium dioxide is realized under a mild processing condition, and the transformation trend is from a steady rutile phase to a metastable anatase phase; the prepared compound phase titanium dioxide is high in crystallinity, is a monocrystal titanium dioxide, and is conducive to fast transfer of photoexcited electrons; and the method for preparing the compound phase titanium dioxide is simple in process, mild in processing condition, low in energy consumption and easy to realize large-scale promotion and application.

The invention relates to a preparation method of brookite titanium doxide nano-rods, which comprises following steps: (1) hydrolyzing titanate in an organic acid aqueous solution and drying a hydrolysis product to obtain a soluble dry gel; (2) dissolving the soluble dry gel in water with addition of an inorganic salt aqueous solution; and (3) performing a hydrothermal reaction in a high-pressure reaction kettle to prepare the high-purity brookite titanium doxide nano-rods. The preparation method is simple in operation, is low in cost, is high in purity of the product, brookite titanium doxide nano-rods, and can producing the brookite titanium doxide nano-rods commercially in large scales.

Disclosed is a sensitive glass film for a pH electrode, which is not deteriorated in its glass strength or pH-measuring function, which is hardly stained, and from which any stain can be removed easily. Also disclosed is a pH electrode having the sensitive glass film. A microparticle comprising rutile-type or brookite-type titanium dioxide or a microparticle comprising amorphous titanium dioxide is adhered directly on the glass film surface of a sensitive glass film for a pH electrode.

The invention discloses brookite titanium dioxide nanocrystalline and a preparation method. The nanocrystalline has a regular chamfer square profile, has uniform particle size with the length of 60 to 80nm, the width of 40 to 60nm, and the thickness of 15 to 30nm; and four crystal planes (210), two crystal planes (101) and two crystal planes (201) are exposed. The pure phase and precious metal loaded brookite titanium dioxide nanocrystalline with the special exposed crystal planes show superior photocatalytic activity and have very wide application prospect in the field of catalysis and the related fields.

The invention discloses a water-based fluorocarbon paint which is composed of the following raw materials in percentage by mass: 30-40% of water-based fluorocarbon emulsion, 5-10% of cellulose, 2-5% of starch, 1-5% of brookite titanium white, 2-5% of wear-resistant powder, 1-5% of nano aluminum oxide, 1-5% of nano titanium dioxide, 1-5% of nano ferrum dioxide, 1-5% of nano carbon dioxide, 1-5% of nano copper oxide, 1-5% of nano magnesium oxide, 1-5% of nano zinc oxide and the balance of deionized water. The water-based fluorocarbon paint is free of benzene, toluene, xylene, ethylbenzene, free diisocyanate and other harmful substances, has the advantages of no toxicity and no pollution, and has the decoration and protection functions of the paint. The prepared paint film has excellent wear resistance and weather resistance.

The invention discloses a method for preparing Cu / N co-doped TiO2 nano-powder on the basis of a dried gel-hydrothermal method. The method for preparing the Cu / N co-doped TiO2 nano-powder on the basisof the dried gel-hydrothermal method comprises the following steps of (1) solution preparation: a solution A: mixing butyl titanate and absolute ethyl alcohol and mechanically and uniformly stirring the butyl titanate and the absolute ethyl alcohol at a room temperature to form a transparent solution; a solution B: accurately weighing copper nitrate and urea and dissolving the copper nitrate and the urea in a mixed solution of tri-distilled water, absolute ethyl alcohol and concentrated nitric acid solution; (2) soil preparation: slowly dripping the solution B into the solution A by using a peristaltic pump to form a soil; (3) gel solution; (4) dried gel-hydrothermal process: adding dried gel powder to distilled water at 60-220 degrees centigrade; placing an obtained mixture in a reactor;sealing the reactor and putting the reactor in a blowing dry box, and carrying out hydrothermal reaction for 10-14 h; and (5) after-treatment. The method for preparing the Cu / N co-doped TiO2 nano-powder on the basis of the dried gel-hydrothermal method, disclosed by the invention, has the advantages that the purposes of dispersing particles and increasing the specific surface area can be achieved,and mixed crystals of anatase and brookite can also be prepared.

The invention discloses a preparation method of a hierarchical brookite titanium oxide / graphene composite material. The hierarchical brookite titanium oxide / graphene composite material is obtained by one-step preparation through a hydrothermal method and in shapes of microspheres with sizes being about 1-2 micrometers, and the microspheres are assembled by nanosheets. The preparation method includes: mixing tetraisobutyl orthotitanate and organic amine in water / ethanol solution, stirring, and subjecting obtained precipitates to hydrothermal reaction in water / ethanol alkaline solution of graphene to obtain a final product. The preparation method has the advantages that the hierarchical brookite titanium oxide / graphene composite material is prepared by the hydrothermal method, the problems of difficulty in synthesis of pure-phase brookite titanium oxide and poor electrochemical performance caused by low conductivity of the pure-phase brookite titanium oxide are solved; related raw materials are common, technical simplicity and feasibility and high yield are realized, and the hierarchical brookite titanium oxide / graphene composite material shows excellent electrochemical performance when being applied to cathodes of lithium ion batteries.

A transparent noise-barrier wall having a coating layer comprising titanium dioxide particles containing brookite-type crystal and a binder material, whereby the coating layer is adhered on an acrylic resin or a polycarbonate resin. So that high photocatalytic activity can be brought out even with a very weak light to decompose the fouling component where the surface is hydrophilized, and is ensured with duration of the transparency for a long period of time.

The present invention provides hydrothermal processes for the production of titanium dioxide from titanyl hydroxide. The use of specific crystallization directors, or additives, can promote the formation of rutile, anatase, or brookite. Variation of process operating parameters can lead to either pigmentary-sized or nano-sized rutile.

A method for forming non-agglomerated brookite TiO2 nanoparticles without the use of expensive organic surfactants or high temperature processing. Embodiments of this invention use titanium isopropoxide as the titanium precursor and isopropanol as both the solvent and ligand for ligand-stabilized brookite-phase titania. Isopropanol molecules serve as the ligands interacting with the titania surfaces that stabilize the titania nanoparticles. The isopropanol ligands can be exchanged with other alcohols and other ligands during or after the nanoparticle formation reaction.

The invention relates to mildew-proof and antibacterial sole polyurethane stock solution and a production process of a polyurethane sole. In the invention, the polyurethane stock solution comprises the following components in percentage by weight: 60 to 65 percent of poly(ethylene adipate)glycol with a number-average molecular weight of 1,000 to 3,000, 20 to 25 percent of isocyanate, 6 to 10 percent of 1,4-butanediol, 1 to 3 percent of triethylene diamine, 0.5 to 0.8 percent of water, 0.2 to 0.6 percent of dimethyl siloxane and 0.5 to 1.5 percent of cobalt / brookite nano titanium dioxide composite, wherein the molar ratio of cobalt to titanium atoms in the cobalt / brookite nano titanium dioxide composite is 1: 9-11. The cobalt / brookite nano titanium dioxide composite of the invention has a high antibacterial property and is suitable to be added into the sole polyurethane stock solution, so that the polyurethane sole has high antibacterial and mildew-proof properties.

An object of the present invention is to provide a transparent noise-barrier wall which is slow to foul, easy to clean even when fouled, and capable of maintaining these effects over a long period of time. The transparent noise-barrier wall has brookite titanium dioxide substantially existing on the surface. The titanium dioxide particles preferably contain about 20% by mass or more of brookite titanium dioxide.

The invention provides a preparation method of a perovskite solar cell electron transport layer based on a low-temperature titanium dioxide mesoporous structure. The electron transport layer comprisesa TiO2 compact layer and a TiO2 mesoporous layer, and the preparation method comprises the following steps: firstly, preparing the TiO2 compact layer on a conductive glass substrate: preparing alcoholic solution of a precursor TiCl4, carrying out spin coating, and performing annealing at the temperature of 150 DEG C; secondly, preparing the TiO2 mesoporous layer on the TiO2 compact layer: preparing alcohol dispersion liquid of brookite phase TiO2 slurry, carrying out the spin-coating, and carrying out the annealing at the temperature of 150 DEG C. The method overcomes the application limitation of high-temperature annealing in the preparation of the TiO2-based electron transport layer in the prior art, achieves the preparation of the TiO2-based electron transport layer under a low-temperature condition, and achieves the preparation by adopting a spin coating method, and the process steps are simple and easy to implement.

The invention relates to an anatase / brookite complex-phase titanium dioxide ultraviolet shielding agent and a preparation method thereof, and belongs to the technical field of novel inorganic materials. According to the invention, the ultraviolet shielding performances of different phases of titanium dioxide are fully utilized, and in a hydrothermal synthesis system of titanium alkoxide, the anatase / brookite complex-phase titanium dioxide ultraviolet shielding material is prepared by using cheap inorganic sodium salt as a crystal form guiding agent, so that the defects of poor light scatteringand poor reflection of the anatase type titanium dioxide ultraviolet region are overcome, and the visible light transmission effect of the composite shielding agent is guaranteed; with the method, the ratio of the anatase type TiO2 to the brookite type TiO2 in the complex-phase shielding agent can be controlled by adjusting the dosage of the crystal form guiding agent, so that the working performances of the shielding agent in UVA and UVB sections can be adjusted as required; and the grain growth of TiO2 can be inhibited by utilizing the interaction between different crystalline phase grainsof the complex-phase TiO2 so as to successfully achieve the nanocrystallization control of TiO2, so that the excellent performance of the obtained ultraviolet shielding agent is guaranteed.

The invention relates to the technical field of new energy materials, and in particular relates to a cauliflower-shaped brookite type titanium dioxide material and a preparation method thereof. The preparation method comprises the following steps: (A) preparing a titanium dioxide material by adopting a hydro-thermal method: adding a titanium precursor solution to an ammonia water and sodium borohydride solution under a stirring condition, and carrying out hydro-thermal reaction at 220-280 DEG C for 12-36h to obtain titanium dioxide precipitate; (B) washing; and (C) carrying out vacuum drying to obtain the cauliflower-shaped brookite type titanium dioxide material. The preparation method has the advantages that the preparation process is simple, the conditions are easy to control and the posttreatment is convenient, and is suitable for large-scale preparation of the cauliflower-shaped brookite type titanium dioxide material; and the cauliflower-shaped brookite type titanium dioxide material has important application in environment science and new energy fields.

The invention provides a preparation method of a double-crystal-form TiO2 photocatalytic material modified on G (graphene). Firstly, TALH, GO (graphene oxide) and urea are taken as raw materials, and single-crystal anatase TiO2 / G, double-crystal anatase-brookite TiO2 / G and single-crystal brookite TiO2 / G are prepared with a hydrothermal synthesis method. During experiments, the phase composition of the double-crystal anatase-brookite TiO2 / G is controlled through adjustment of the concentration of the urea in a TALH solution. The photocatalytic activity of a synthesized double-crystal anatase-brookite TiO2 / G composite material is tested through degradation of a methyl orange solution. The composite material belongs to an inorganic photocatalytic material, is stable in performance, higher in photocatalytic activity and resistant to chemical corrosion and photocorrosion and has important significance in aspects of water photolysis, sterilization, preparation of solar sensitized batteries, environmental protection and the like.