738 results about "Anatase titanium dioxide" 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

Nanomaterials of the JT phase of the titanium oxide TiO_2-x, where 0≦x≦1 having as a building block a crystalline structure with an orthorhombic symmetry and described by at least one of the space groups 59 Pmmn, 63 Amma, 71 Immm or 63 Bmmb. These nanomaterials are in the form of nanofibers, nanowires, nanorods, nanoscrolls and/or nanotubes. The nanomaterials are obtained from a hydrogen titanate and/or a mixed sodium and hydrogen titanate precursor compound that is isostructural to the JT crystalline structure. The titanates are the hydrogenated, the protonated, the hydrated and/or the alkalinized phases of the JT crystalline phase that are obtained from titanium compounds such as titanium oxide with an anatase crystalline structure, amorphous titanium oxide, and titanium oxide with a rutile crystalline structure, and/or directly from the rutile mineral and/or from ilmenite. The titanates are submitted to dynamic thermal treatment in an inert, oxidizing or reducing atmosphere to produce the JT phase of the TiO_2-x, where 0≦x≦1 with an orthorhombic structure.

The invention relates to a low-vanadium denitration catalyst and a preparation method and application thereof, and belongs to the technical fields of environmental materials, environmental catalysis and environmental protection. The catalyst is prepared by a co-immersion method by adopting anatase titanium dioxide as a carrier, vanadium pentoxide as a main active component and tungstic oxide and cerium oxide as minor active components. Moreover, the low-vanadium denitration catalyst is characterized in that the catalyst reduces both the dosage of highly toxic vanadium and cost, and also has a conversion rate of NOx higher than 90 percent within a temperature range from 200 to 450 DEG C. The method provided for reducing nitrogen oxide comprises the following steps: putting the catalyst in a fixed bed reactor and controlling the reaction temperature between 200 and 500 DEG C; and taking NH3 as a reducing agent and controlling air speed at 28,000h and total gas flow at 300ml/min. The low-vanadium denitration catalyst still maintains high conversion rate of NOx in the presence of water and sulfur dioxide, and is suitable for treating NOx in exhaust gases discharged from thermal power plants, smelting plants, oil plants, and the like.

This invention relates to methods of making single phase nanocrystalline titanium dioxide. It is hereby provided a method for preparing single-phase anatase type titanium dioxide photocatalyst having a particle size of nano level at near room temperatures without the need for a sintering process at high temperatures.

One embodiment of the invention comprises an oral care system that comprises a photocatalytic solution. The photocatalytic solution may comprise titanium oxide nanotubes. The system may also include an oral instrument that is coupled to a light source. The photocatalytic solution will degrade oral pollutants upon exposure to illumination from the light source. The photocatalytic solution may be disposed, for example, within, on or about a dentifrice. The titanium oxide nanotubes may be rectangular in cross-section, anatase in form and less than 500 nm in width, less than 500 nm in length, and less than 5000 nm in height.

The present invention relates to an ultraweatherability self-cleaning paint for outer wall, and its composition contains pigment filling material, moistening dispersing agent, defoaming agent, thickening agent A, B and C, polymer emulsion, anti-mildew bactericide, film-forming adjuvant and water, etc. Said emulsion paint has the water-proofing property, good dirt resistance and anti-ageing property. In particular, the anatase titanium dioxide powder body is added, it make said paint has self-cleaning function. The invention also provides preparation method.

A method for preparing a neutral, stable and transparent photocatalytic titanium dioxide sol is provided. The method comprises (1) contacting an alkaline titanium dioxide sol with an alkaline peptizing agent to provide a peptized alkaline titanium dioxide sol; (2) neutralizing the peptized alkaline titanium dioxide sol; and (3) obtaining or collecting the neutral, stable and transparent photocatalytic titanium dioxide sol. The titanium dioxide sol is stable and transparent over a range of pH of about 7.0 to about 9.5. The titanium dioxide sol may include crystallites of titanium dioxide having an average particle size of less than about 10 nm with at least 90% of the crystallites being in the anatase form.

The invention relates to a preparation method of diatomite ceramic particles or diatomite ceramic plates. The preparation method of the diatomite ceramic particles comprises the following steps: grinding diatomite, adding cosolvent, mineral powder and vegetable fiber powder to mix evenly and grind; and adding water to mix, shaking to obtain diatomite ceramic particles, and roasting to obtain the finished diatomite ceramic particles. The preparation method of the ceramic plates comprises the following steps: using evenly mixed powder to perform dry pressing with a pressure forming machine, or using mud with the water content of 15-25wt% to perform extrusion forming; and roasting to obtain the diatomite ceramic plates. The formed and dried diatomite ceramic plates or diatomite ceramic particles are soaked in slurry prepared from anatase titanium dioxide nanometer powder or metatitanic acid powder and then dried and roasted to obtain diatomite ceramic particles or diatomite ceramic plates with photochemical activity. In the invention, the low temperature sintering method is adopted to prepare the diatomite diatomite ceramic plates and ceramic particles which have high diatomite content and good adsorption property and water resistance and can be combined with various functional components on the surface. The diatomite ceramic products in the invention are convenient to use and have simple production technology and cheap and easy available raw materials.

A sol solution containing poly(titanic acid) and a planar heterocyclic ligand is provided. Titanium dioxide (TiO₂) particles are formed by aging the sol solution at a temperature below about 140° C. The particles have metallocene-like Ti-complexes comprising the heterocyclic ligand and can be substantially in the anatase phase. The heterocyclic ligands can be triazole, tetrazole, or thiadiazole. The sol solution may be prepared by aging a precursor solution. The precursor solution may contain the heterocyclic ligands and a precursor for poly(titanic acid). The precursor may be titanium alkoxide or titanium chloride. The sol solution may also contain at least one of an organic acid, a base, and a surfactant. The aged sol solution may form a colloidal dispersion of the TiO₂ particles. A photo-catalytic and transparent film may be formed from the TiO₂ particles by depositing a layer of the colloidal dispersion on a support.

The invention discloses a method by which titanium dioxide nanometer tube array layer is prepared on surface of titanium base material, wherein the titanium base materials undergo the surface pretreatment and receive the electrochemistry anodic oxidation treatment in the electrolyte containing the HF acid, the components of the mixed electrolyte are that the ammonium dihydrogen phosphate is 1 to 3mol/L and the hydrofluoric acid is 0.2 to 0.4mol/L, as a result, the amorphous form titanium dioxide nanometer tube surface structure is achieved; the subsequent heat treatment condition is that under air atmosphere, the rate of temperature rise is 3 DEG C/min, the heat is preserved for 3 hours at the temperature of 450 DEG C, the anatase titanium dioxide nanometer tube array layer is achieved after being cooled in the furnace to the room temperature. The electrolyte system prepared based on the method of the invention can control the balance of oxidation and the corrosion within a relatively long time, thereby preferably realizing the control on the shape of the titanium dioxide nanometer tube. The invention has the advantages of easy operation, low cost and orientated and order distribution of the prepared titanium dioxide nanometer tube array; moreover, the amorphous form titanium dioxide nanometer tube is generated normal to the direction of the base; the tube diameter is 80 to 100nm, the wall thickness is 18 to 21nm, the tube length is 0.7 to 2.0um, thereby the specific surface area is large.

A method for removing dissolved contaminants from solution using a surface-activated crystalline titanium oxide product having a high adsorptive capacity and a high rate of adsorption with respect to dissolved contaminants, in particular, arsenate and arsenite. Preferably, the titanium oxide product includes crystalline anatase having primary crystallite diameters in the range of 1-30 nm. The surface-activated titanium oxide is combined with other filter media to further improve the removal of dissolved contaminants.

The invention discloses a lithium titanate/carbon/carbon nano tube composite electrode material and a preparation method thereof. The composite electrode material consists of lithium titanate, wrapped carbon and carbon nano tube in mass ratio of 90-97: 0-5: 3-5. Lithium-containing compound, anatase titanium dioxide and carbon nano tube are used as raw materials, and the method comprises the following steps of: preparing a lithium titanate/carbon nano tube composite by a wet chemistry method, then wrapping the obtained lithium titanate/carbon nano tube composite by adopting an organic substance, and finally thermally treating the wrapped composite under an inert atmosphere to obtain the lithium titanate/carbon/carbon nano tube composite electrode material. The lithium titanate/carbon/carbon nano tube composite electrode material has the characteristics of high multiplying power, high specific capacity and long service life.

The invention discloses solar glass self-cleaning antireflection paint and a production method thereof. In the solar glass self-cleaning antireflection paint, poly silicon dioxide is used as a main antireflection component, low reflection titanium dioxide is used as an auxiliary antireflection component and a photocatalyst, antimony doped tin oxide, titanium phosphate, silicon phosphate, phosphoric acid and antimony doped tin phosphate are used as a self-cleaning synergist, an antistat and an antireflection membrane enhancer, and deionized water is used as a solvent. The production method comprises the step: a porous silicon dioxide shell generated through ethyl silicate hydrolysis is covered with the anatase titanium dioxide photocatalyst, the antimony doped stannic oxide antistat and other synergist components. The problem that antireflection performance and the self-cleaning performance of conventional solar glass self-cleaning antireflection paint can offset each other is solved, the power generating efficiency of a solar cell can be improved and stabilized greatly, and the maintenance management cost of the solar cell can be reduced.

With regard to a substrate for a transparent electrode and transparent conductive thin film each having transparency and conductivity, a transparent metal material and transparent electrode are provided which are capable of being stably supplied and are composed of raw materials with superior chemical resistance. When a metal oxide layer (12) composed of an anatase type crystal structure is provided on a substrate (11) to constitute the metal oxide layer (12) by M:TiO₂, low resistivity is achieved while internal transmittance is maintained. M:TiO₂ obtained by substituting other atoms (Nb, Ta, Mo, As, Sb, or W) for Ti of the anatase type TiO₂ enable maintenance of transparency and remarkably improvement of electric conductivity.

The invention provides a method for preparing a cadmium sulfide-titanium dioxide nano-tube composite catalyst in the technical field of photocatalyst. The method comprises the following steps: 1, putting anatase TiO2 nano-particles in a polytetrafluoroethylene reaction kettle, adding deionized water into the reaction kettle, and stirring the mixture; 2, adding aqueous solution of CdCl2.2.5H2O and aqueous solution of Na2S.9H2O into the polytetrafluoroethylene reaction kettle in sequence, mixing the mixture, adding NaOH into the mixture, and performing ultrasonic oscillation on the mixture; and 3, performing microwave heating on the polytetrafluoroethylene reaction kettle, standing the mixture, cleaning the mixture until the pH of the lotion is 7, pumping and filtering the lotion, and drying the filter cake in vacuum to obtain the CdS-TiO2 nano-tube composite catalyst. In the CdS-doped TiO2 nano-tube prepared by the method, spectral response of the titanium dioxide nano-tube is expanded to a visible light range to ensure that the catalyst can absorb the visible light, so that the catalytic hydrogen production activity of the catalyst is improved.

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 discloses a purifying device and method for spraying industry VOCs exhaust gas; the purifying device comprises the following processing systems: a static pressure filtration device, a spray scrubber, a demister, a photocatalytic purification tower, multiple groups of activated carbon adsorption tanks, a regeneration fan and a draught fan chimney which are connected successively; the static pressure filtration device is internally provided with a coarse-effect filter; the spray scrubber is internally provided with a water tank, and a Fenton reagent solution can be added in the water tank; the demister is used for removal of water mist brought out when exhaust gas passes through the spray scrubber; a photocatalytic reaction cavity of the photocatalytic purification tower is internally provided with a nano composite anatase titanium dioxide photocatalyst and an UV light; the multiple groups of activated carbon adsorption tanks are internally provided with coconut shell activated carbon. The purifying device and method have better processing effect on organic exhaust gas generated in spraying industries.

The invention relates to a ceria-based denitration catalyst and a preparation method thereof. The catalyst takes anatase titanium dioxide as a carrier, cerium oxide as a main active component and tungsten trioxide as an auxiliary agent having the synergistic effect, and the catalyst is expressed as CeO2-WO3/TiO2. The preparation method comprises the steps of: dissolving oxalate into deionized water to prepare oxalate solution; adding ammonium paratungstate into the oxalate solution for heating in a water bath to prepare transparent solution; dissolving cerous nitrate into the oxalate solution to prepare mixed solution; dripping the mixed solution into the transparent solution to prepare solution with flocculent precipitates; adding titanium dioxide powder into the solution with the flocculent precipitates for stirring and heating in a water bath to prepare slurry; and performing ultrasonic immersing, drying and calcination on the slurry to prepare the CeO2-WO3/TiO2 catalyst. The catalyst can purify oxynitride under the high-sulfur, high-dust and high-temperature environment, and can reduce cost and improve use safety.

The invention provides a preparation method of urchin-like titanium dioxide magnetic microspheres having double-layer cavity structures. The method comprises the following steps of: preparing monodisperse ferroferric oxide magnetic microspheres with uniform particle sizes; (2) coating silicon dioxide and titanium dioxide in sequence on the surface of ferroferric oxide with a sol-gel method; (3) adjusting conditions such as the concentration of a sodium hydrate solution, hydro-thermal reaction time and the like to prepare urchin-like titanium-based magnetic microspheres having single/double-layer cavity structures; and (4) treating the titanium-based magnetic microspheres with a hydrochloric acid solution with a certain concentration, and calcining at high temperature to obtain anatase urchin-like titanium dioxide magnetic microspheres having double-layer cavity structures. A material prepared with the method has a high-activity anatase titanium dioxide crystal structure, an urchin-like surface and a large specific surface area; the double-layer cavity structures can accommodate a large quantity of guest molecules; the microspheres have superparamagnetism, and simple and quick separation and recovery of a catalyst can be realized; and the method has the advantages of low preparation cost, controllable process flow, easiness for operating, environmental friendliness and low energy consumption.

The invention discloses a composite-carrier catalyst for selective catalytic reduction in flue gas denitrification, and a preparation method thereof. The carrier of the catalyst is a composite carrier. The composite carrier comprises anatase titanium dioxide nanoparticles and/or cordierite and/or ceramic fibers. The composite carrier has a microporous structure with stable pores. The catalyst is prepared by the co-mixing process which comprises the following steps: dissolving active components to obtain a solution with a pH value less than 2 or dissolving active components together with components of a catalyst promoter to obtain a solution; mixing the resulting solution with the composite carrier, deionized water, binders and lubricants, kneading, curing, kneading, filtering under a high pressure, molding, drying and calcining. The composite-carrier catalyst has the advantages of high mechanical strength, high catalytic activity and broad active temperature window rang, and is widely applied to the catalytic reduction of nitrogen oxides in the selective catalytic reduction of flue gas denitrification.

A titanium pigment and its production are disclosed. Anatase titanium dioxide content is <99% and water dispersion is <92% and emulsified dispersant 0.1-0.4% is added. It's simple and cheap, less consumption, excellent coating covering powder and mechanical performance. It's convenient for transportation and storage.

Production processes are provided which can produce, at a relatively low temperature and in a reduced number of steps, anatase titanium oxide powder having high photocatalytic activity and large specific surface area and anatase titanium oxide slurry having high storage stability and dispersibility. The slurry thus obtained can also be coated, as a coating material having photocatalytic activity, on materials having low heat resistance. In the production process of anatase titanium oxide powder according to the present invention, a titania sol solution, a titania gel, or a titania sol-gel mixture is heat treated in a closed vessel under pressure, and the treated product is then dried to produce anatase titanium oxide powder. In the production process of anatase titanium oxide slurry according to the present invention, a titania sol solution, a titania gel, or a titania sol-gel mixture is heat treated in a closed vessel under pressure, and the treated product is then dispersed/stirred to produce anatase titanium oxide slurry.

The invention belongs to the technical field of remediation of pollution of arsenic in soil, arsenic in sediment and arsenic in tailings, also relates to the technical field of agriculture environmental protection, in particular to a chemical fixing material suitable for remediation of pollution of arsenic in soil, arsenic in sediment and arsenic in tailings, and a preparation method and application thereof. The chemical fixing material prepared can effectively fix the arsenic in arsenic-polluted soil, arsenic-polluted sediment, arsenic-polluted tailings and the like, reduce the bioavailability of the arsenic, and inhibit crops from absorbing and accumulating the arsenic. The chemical fixing material for the arsenic is characterized in that: 200kg of dry basis of a finished product comprises the following compositions by weight: 120 to 145kg of nano-grade anatase titanium dioxide, 30 to 40kg of nano-grade rutile titanium dioxide, and 20 to 30kg of zero-valent iron powder (of which 90 percent passes through a 100-mesh sieve); and 0 to 10kg of tree saw dust or stalk powder is added or not added so as to prepare the chemical fixing material. The invention also discloses the preparation method and the application of the material.

The invention discloses a producing method of yellowing-resistant general anatase titanium dioxide. The method comprises the following steps: A, beating calcined anatase titanium dioxide with desalted water to prepare slurry, adding wetting agent sodium silicate, and then adjusting the slurry pH to 9-11; B, sanding to obtain anatase titanium dioxide initial product slurry with 325 mesh residues on a sieve being less than 0.01%; C, diluting with the desalted water to a concentration of 280-340g / L by TiO2, adjusting the pH to 9-11; D, heating up to 40-90 DEG C, then adding silicon salt within 10-60min, curing for 60-120min; adding aluminium salt, curing for 15-60min; adding the aluminum salt again, curing for 60-120min; and E, filtering, washing, drying, adding an organic surface treatment agent for gas pulverization to obtain the general titanium dioxide. The general titanium dioxide produced by the method has the characteristics of good lattice stability, strong water dispersion stability and the like, and especially has the characteristics of heat-resisting and yellowing yellowing-resistant characteristics.

Roofing granules having a color coating layer are covered with a clear, transparent or translucent outer coating composition including a functional material, such nanoparticles of anatase titanium dioxide.

Provided is a laminate which includes a transparent conductive film layer that is composed of an oxide thin film mainly composed of titanium oxide and contains an additional element such as niobium, and also contains an anatase phase having more excellent crystallinity and further has high refractive index and low resistivity by forming an optimal buffer layer on the substrate. Also provided are: a semiconductor light emitting element which comprises the laminate; and a functional element such as a solar cell, which includes the laminate.