1081 results about "Tio2 photocatalyst" patented technology

The invention relates to a preparation method of a noble metal modified titanium dioxide photocatalyst, which refers to a photo-catalytic oxidation-reduction coupling method realized in a photo-catalytic reactor: firstly, TiO2, noble-metal water soluble salt and organism are used for preparing a suspension which is then ultrasonically vibrated after the pH value is regulated to 1-12, put into a photo-catalytic reactor for reaction for 0.5h to 8h at 0 DEG C to 90 DEG C under the irradiation of an ultraviolet source with the power of 8W to 125W or a medium or high-voltage mercury lamp source with the power of 100W to 600W, and then separated, washed and dried to obtain the TiO2 photocatalyst modified by noble metal Ag, or Au, or Pt or Pd, wherein, the content of TiO2 is 90 percent to 99.99 percent, the content of the noble metal is 0.01 percent to 10 percent. The noble metal modified titanium dioxide photocatalyst has high photocatalytic degradation activity and strong surface hydrophobicity and the attached catabolites are easy to clean.

The invention provides a preparation and application method for photocatalysis environmental protection type painting, which relates to construction painting, especially provides a preparation and application method for photocatalysis function painting, which includes steps: mixing titanium-containing organic, water, chelating agent and hydrolysis inhibitor to prepare nano anatase type titanium dioxide water sol; adding metal, oxide or impure titanium dioxide photocatalyst into the titanium dioxide water sol and stirring equably. Using method is coating inorganic isolated layer firstly and coating the photocatalysis painting after drying. Advantages of the invention are: the prepared painting and using technique can be widely used for inner and outer wall surface of building and is harmless to bottom ainting, photocatalysis efficiency is high, cost is low, bonding is firm, transparency is good, preparation is simple, and usage is easy.

In order to degrade the pollutants in water and atmosphere by the photocatalysis technology, the invention discloses a method for preparing a high activity non-metallic ion co-doped titanium dioxide photochemical catalyst. In the photochemical catalyst, titanium ester or titanate is used as a precursor, non-metallic compound comprising boron, carbon, nitrogen, fluorin, silicon, phosphor, sulfur, chlorine, bromine, iodine, and the like, are used as doping agents, the high activity non-metallic ion co-doped titanium dioxide photochemical catalyst is prepared by adopting the sol gel method. Compared with a titanium dioxide photochemical catalyst single-doped with pure titanium dioxide and the non-metallic irons, the visible light catalytic activity of the titanium dioxide photochemical catalyst on the degradation of parachlorophenol is greatly improved, and the ultraviolet light catalytic activity can also exceed the catalytic activity of the pure titanium dioxide catalyst. The method also has the advantages that the preparation technique is simple, the equipment requirement is low; the particle diameter of the product is small, the specific surface is relatively high, the dispersivity is good, thus having a wide application prospect in the environmental cleaning scientific field.

To provide a photocatalyst dispersion liquid obtained by dispersing titanium oxide photocatalyst particles and tungsten oxide photocatalyst particles in a dispersion medium, where the surfaces of both titanium oxide photocatalyst particles and tungsten oxide photocatalyst particles are charged positively or negatively. In the photocatalyst dispersion liquid, the titanium oxide photocatalyst particles and the tungsten oxide photocatalyst particles, which are dispersed in the dispersion medium, are not aggregated easily, and a solid-liquid separation is not generated.

A tungsten oxide/titanium dioxide photocatalyst coating oxidizes contaminants in the air that adsorb onto the coating into water, carbon dioxide, and other substances. The tungsten oxide forms a monolayer on the titanium dioxide. When photons of the ultraviolet light are absorbed by the tungsten oxide/titanium dioxide photocatalyst coating, an electron is promoted from the valence band to the conduction band, producing a hole in the valence band. The holes in the valence band react with water applied on the tungsten oxide/titanium dioxide photocatalyst coating, forming reactive hydroxyl radicals. When a contaminant in the air is adsorbed onto the tungsten oxide/titanium dioxide photocatalyst, the hydroxyl radical attacks the contaminant, abstracting a hydrogen atom from the contaminant. The hydroxyl radical oxidizes the contaminant, producing water, carbon dioxide, and other substances. The tungsten oxide/titanium dioxide photocatalytic coating has low sensitivity to humidity variations.

The invention discloses a noble metal-carrying titanium dioxide catalyst, which consists of nano titanium dioxide serving as a primary catalyst and a noble metal serving as a cocatalyst, wherein the cocatalyst is loaded on the nano titanium dioxide primary catalyst in an amount of 0.1 to 5 weight percent. The invention has the advantages of stable properties, high activity, high selectivity, low price and environmental friendliness.

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.

The invention provides a nanofiber load titanium dioxide photocatalyst and a preparation method thereof, which belong to the technical field of preparation of novel nanometer photocatalyst functional materials. The method comprises the following steps: preparing a homogeneous spinning solution with titanium precursor, a hydrolysis inhibitor, a polymer and an organic solvent; carrying out spinning according to a proper electrostatic spinning process to obtain a nanofiber felt/film; introducing hydroxyl groups into electrospun nanofiber, and immersing the electrospun nanofiber in an aqueous solution containing an ammoniation agent, so that hydrolysis and ammoniation reaction of titanium precursor occurs and produces titanium-ammino complex; and carrying out post treatment processes such as baking and the like to obtain the nanofiber load titanium dioxide photocatalyst. The catalyst has excellent photo-catalytic activity in response to ultraviolet light or visible light, and can effectively improve the bonding reliability of titanium dioxide with nanofiber with the help of the action of nitrogen bond.

The present invention involves increasing the quantum efficiency in titania photocatalysts for photocatalytic (oxidation of acetaldehyde) and photosynthetic (photosplitting of water) reactions by integrating the titania photocatalyst with a polar mineral having surface electrical fields due to pyroelectric and piezoelectric effects, and by adjusting the nanostructure of the photocatalyst materials. The photocatalytic reactivity of titania powder is increased due to the effect of electric field present on the surface of polar mineral material on the photocatalytic effect of commercial titania with respect to photolysis of water. Additionally, the photocatalytic performance of pure phase rutile and anatase nanostructures with well defined morphologies was found to improved with respect to certain photocatalytic reactions in comparison with non-structured titania.

The invention relates to a nanometer titanium dioxide photocatalyst co-doped with boron and other elements and a preparation method thereof. The method uses titanate and boric acid as a titanium source and a boron source; the other doped elements comprise one or more of transition metal, rare-earth metal or nonmetal; and the method adopts acetic acid, nitric acid or citric acid as a hydrolysis catalyst and a mixture of alcohol and water as a reaction system and prepares the nanometer titanium dioxide photocatalyst co-doped with the boron and the other elements by a sol-gel reaction and calcinations. The nanometer titanium dioxide co-doped with the boron and other elements prepared by the method can absorb visible light and has catalytic activity of the visible light.

The invention discloses a dielectric barrier discharge plasma, adsorption and photocatalysis synergy waste water treatment device, which is characterized in that: an organic glass cylinder and a quartz glass tube are arranged to form a sleeve; the organic glass cylinder serves as an outer sleeve layer; active carbon fibers carrying a titanium dioxide photocatalyst are fixed on the inner side wall of the organic glass cylinder; the top part of the organic glass cylinder is provided with a water distributer capable of forming a water film on the surface of the active carbon fibers; the water in a water tank is led to the water distributor by a water pump; the quartz glass tube serves as a central tube; and a cylindrical metal electrode is arranged in the quartz glass tube to form a dielectric barrier discharge cavity. The device combines a dielectric barrier discharge plasma technique and an adsorption and photocatalysis technique to achieve a waste water treatment aim.

A method for producing a titanium dioxide photocatalyst is provided. The method uses a sol-gel process wherein acid and base catalysts are added in two separate steps. According to the method, a titanium dioxide photocatalyst with increased mesoporosity can be produced without the use of any particular additive. Further, an anatase structure is formed upon drying and is maintained even after high-temperature calcination. Further provided is a titanium dioxide photocatalyst produced by the method. Further provided is a titanium dioxide photocatalyst doped with sulfur and zirconium, which is produced by using the method. The doped titanium dioxide photocatalyst exhibits catalytic activity even under visible light and excellent surface characteristics to achieve improved photocatalytic activity.

A visual light responsive TiO2 photocatalyst for cleaning indoor air is prepared from the efficient self-cleaning TiO2 paint used for external wall through proportionally mixing it with the oxide system of rare metal and transition metal to form the metal/TiO2 heterojunction and modify the TiO2, which can be activated by visual light to clean indoor air.

The invention relates to a preparation method of activated carbon supported titanium dioxide photocatalyst, belonging to the preparation technical field of titanium dioxide photocatalyst, comprising a plurality of steps as followings: pretreating, washing and drying the activated carbon; at the condition of ice-water bath, adding meta-titanic acid and ammonia according to a molar ratio of 1:2 into 20 to 40 milliliter hydrogen peroxide with a concentration of 30%, and agitating for 50 to 70 minutes to obtain a yellowish green sol; then adding the pretreated activated carbon into the yellowish green sol and agitating for 3 to 5 hours, filtering the activated carbon after standing for 12 to 24 hours, then calcining with the protection of inert gas to obtain the activated carbon supported titanium dioxide photocatalyst. The weight ratio of the pretreated activated carbon and the meta-titanic acid is 1:1 to 3:1. The preparation method has the advantages of simple technology, cheap raw material, mild preparation conditions, easy operation, granular shape, good organic pollutant degradation effect, easy separation, regeneration and long service life of the supported photocatalyst prepared by the preparation method, nonuse of organic solvent, non-pollution in the whole production process, accordance with the requirement of sustainable development and environment-friendly integrated technology.

A metallic wire screen skeleton material-carried nm-clas cystol TiO2 photocatalyst is prepared through preparing transistion layer sol from n-butyl titanate as precursor, preparing active layer sol from n-butyl titanium or TiCl4 and pore-forming agent, coating the transition layer sol on the cleaned metallic wire screen skeleton-shaped carrier, directly coating the active layer sol, drying and calcining; or preparing nm TiO2 powder suspension, and attaching it the said carrier to form the photocatalyst. Its advantages include high adhesion, low gas resistance and high photocatalytic efficiency and activity.

The invention provides an efficient photocatalysis water treatment device. The efficient photocatalysis water treatment device comprises a tank body, a quartz tube, a backflow port, an extra-ultraviolet tube, a three-dimensional ceramic honeycomb net photochemical reaction chamber, a sewage distributor, a sewage port, an aeration port, an aeration assembly, a sewage draining port, a medicine distributing assembly, a medicine port, a coarse filtering net, a high-pressure backwashing device, a high-pressure water port, a tail gas recovering port and a reciprocating motion device; three ports are formed at the lower part of the tank body, namely, an organic sewage port, the aeration port and the medicine port; the three-dimensional ceramic honeycomb net photochemical reaction chamber for loading the extra-ultraviolet lamp and a nanometer TiO2 photocatalyst are formed at the upper part of the tank body; and the tail gas recovery port is formed at the upper part of the tank body.

The invention provides a grading three-dimensional porous graphene/titanium dioxide photocatalyst and preparation method thereof. The photocatalyst is composed by a three-dimensional grapheme framework and nano titanium dioxide particles; the grahene is provided with a macroporous structure; titanium dioxide is mesoporous titanium dioxide; the macropores and the mesopores are communicated; the nano titanium dioxide particles are scattered on a grapheme nano sheet; the surfaces of nano titanium dioxide microspheres are wrapped with graphene nano sheets; the macropores of the graphene are filled with the nano titanium dioxide microspheres. The photocatalyst with a three-dimensional structure can not only prevent the graphene sheet layers from stacking, but also scatter titanium dioxide particles excellently, and is high in specific surface area; besides, samples can be used for photocatalysis degradation of methylene blue, and the methylene blue can be fully degraded in 25 minutes. The preparation method provides a new thought for preparation of the photocatalyst, and has a potential application value in the fields of energy sources and environment.

The present invention discloses an apparatus and method for disinfecting an object in a batch, continuous, or mixed mode. The apparatus according to the present invention comprises a bath to/from which water is flowed in/drained out; and at least one ultraviolet ray (UV) lamp unit assembly mounted in the bath, each UV lamp unit assembly including a plurality of UV lamp units. Each UV lamp unit comprises a quartz tube, a UV lamp mounted in the quartz tube and a photo-catalyst layer of titanium dioxide formed on an outer surface of the quartz tube to disinfect an object in the bath by the photo-catalytic reaction of titanium dioxide and UV. The apparatus of the present invention may comprise a conveyer device comprising a driving roller, driven rollers and a conveyer belt wound around the rollers, the conveyer device is divided into an inlet portion formed at a first outside of the bath, a conveying portion formed in water in the bath and a discharging portion formed at a second outside of the bath.

A nitrogen doped TiO2 photocatalyst for preparing hydrogen by photodecomposing H2O is prepared through using N to substitute part of O in TiO2 by solid-phase reaction, and reaction between urea and TiO2 powder or its precursor.

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.

A visible light activatable mesoporous titanium dioxide photocatalyst having a surface area of from 100 m²/g to 400 m²/g. The photocatalyst may have a rate of decomposition greater than 0.005 min⁻¹. The photocatalyst may have a band gap width less than 2.95 eV. The photocatalyst may comprise undoped titanium dioxide or doped titanium dioxide. A hydrothermal process for synthesising a photocatalyst is also described.

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.

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.