35 results about "Degussa p25" patented technology

The invention belongs to the field of preparation of inorganic micro / nano materials and relates to a fractionated mixed-crystalline TiO2 micro / nano material prepared by a physical mixing method. The method comprises the following steps: preparing anatase type fractionated TiO2 particles and rutile TiO2 particles both composed of two-dimensional nanosheets as base structures by a hydrothermal method, respectively, then enabling rutile particles to be evenly attached on the surface of the anatase by use of a solvent, and enabling the rutile particles and the anatase to be closely bonded with each other by virtue of low-temperature calcination without destroying the morphology, thus obtaining the fractionated mixed-crystalline TiO2 micro / nano material. The diameter of the fractionated mixed-crystalline TiO2 micro / nano material ranges from 0.8 to 2 microns, the width of the nanosheets ranges from 50 to 100nm, the diameter of the rutile particles ranges from 5 to 15nm, and the mass percent of the rutile particles ranges from 1 to 40%. The fractionated mixed-crystalline TiO2 micro / nano material is applicable to the photocatalysis field, and better than Degussa P25 in adsorption property and photocatalysis property while degrading a methylene blue dye.

The present invention relates to a preparation method of AgBr / TiO2 system with high-effective visible light photocatalytic activity. Said method includes the following steps: adding commercially-available Degussa P25 into deionized water, ultrasonic treatment for 20-50 min, then adding cetyl trimethyl ammonium bromide (CTAB) into the suspension, stirring them for 30 min at room temperature, then adding [Ag(NH3)2]+ solution, making Ag content in AgBr / TiO2 be 5-15 wt%, the mole ratio value of CTAB and Ag+ be 2-4, stirring obtained system at room temperature, making centrifugal separation of sample, dring at 70deg.C, calcining the obtained powder body at 450-650deg.C so as to obtain the invented AgBr / TiO2 sample.

The invention provides a TiO2 material with a three-dimensional structure and a preparation method and application thereof. The TiO2 material comprises a three-dimensional flower-like microsphere structure composed of multiple TiO2 nanowires emitted from the center in a radial manner, wherein the particle sizes of the three-dimensional flower-like microspheres are 3-6 microns, the diameters of the nanowires are 20-50nm, and the length of the nanowires is 1.5-3 microns. The preparation method of the three-dimensional flower-like TiO2 material comprises the following steps of dissolving metal Ti powder in a mixed solution of H2O2 / HNO3, and performing a hydrothermal reaction with sodium hydroxide at certain temperature; after the reaction, performing centrifugal separation and washing until the pH value of the solution is 7; drying in an oven. The three-dimensional flower-like TiO2 material provided by the invention has higher adsorption property and photocatalysis property than Degussa P25 nano TiO2 in degrading methylene blue dyes.

The invention discloses a nano-titanium dioxide and polyphosphazene based composite optical catalyst and a preparation method thereof in the technical field of catalyst preparation. The preparation method comprises the steps of: putting 1 part by weigh of hexachlorocyclotriphosphazenes, 2.16 parts by weigh of bisphenol and 1-5 parts by weigh of nano-titanium dioxide into 2500 parts by weigh of organic solvent, and obtaining a dispersing solution after ultrasonic dispersion; further adding 73 parts by weigh of acid binding agent, obtaining the dispersion solution of a target product through warming water bath, and filtering, washing and drying to obtain the nano-titanium dioxide and polyphosphazene based composite optical catalyst. In the invention, the nano-titanium dioxide and polyphosphazene based composite optical catalyst with a nuclear shell structure is obtained by cladding and modifying Degussa P25 nano-titanium dioxide with polyphosphazene. Compared with the P25, the optical catalyst has an excellent absorption property on a target organic pollutant and shows higher optical catalytic activity in the presence of the irradiation of ultraviolet light.

The present invention provides a low-temp. solvent evaporation induced crystallization method for preparing nano crystal titanium dioxide. Said invention method includes the following steps: hydrolyzing alcohol salt of titanium in water, then ageing, finally progressively evaporating solvent at 80-180 deg.C, at the same time inducing titanium dioxide to crystallize so as to obtain the invented nano crystallized titanium dioxide photocatalyst material. By reducing phase-transition temperature the titanium dioxide photocatalyst obtained by said invention possesses high catalytic activity approaching to Degussa P25, large specific surface area (greater than 250 sq.m / g) and small grain size (less than 6nm).

The invention relates to a quantum dot photocatalytic flexible film as well as a preparation method and an application thereof. The quantum dot photocatalytic flexible film comprises a flexible organic substrate as well as a silicon dioxide layer, a TiO2 layer and a quantum dot layer which are loaded onto the substrate, wherein the TiO2 is one or more of 25nm anatase, 200-400nm TiO2 or Degussa P25 type TiO2. The quantum dot photocatalytic flexible film is obtained by carrying out sensitization on a green non-toxic CuInS2-based quantum dot with relatively large visible light absorption coefficient, photocatalytic degradation of fumigant in visible light can be realized, and emission loss of the fumigant in the air is controlled; and meanwhile, a CuInS2 / ZnS:Al-TiO2 quantum dot photocatalytic flexible film has relatively high stability. Compared with the prior art, the prepared quantum dot photocatalytic flexible film has the advantages of degradation of the fumigant in the visible light, high efficiency, stability, environmental friendliness and easy operation.

The invention relates to a mumm-shaped 3D TiO2 nanometer material. The diameter of the flower is from 2 to 4 micrometers, a plurality of layers of petals are sent out from the central area, the length of the nanometer belt-shaped petal is from 100 nanometers to 2 micrometers, and the width of the nanometer belt-shaped petal is from 10 to 30 nanometers. The preparation method of the 3D TiO2 nanometer material is as following: titanium is used as a raw material and chemically processed to be mixed with a sodium hydroxide or potassium hydroxide solution, and hydro-thermal reaction is carried outunder a certain temperature. After the reaction is ended, the solution is rinsed until the pH value is about 7, and then the solution is dried in a baking oven. Compared with Degussa P25 nanometer TiO2, the absorption performance and the photochemical catalysis activity of the 3D TiO2 nanometer material of the invention for degrading methylene blue dye are higher.

The invention belongs to the field of photocatalytic materials, and particularly relates to a near-infrared light compound photocatalyst and a preparation method thereof. The compound photocatalyst is formed by mechanically mixing an up-conversion luminescent material beta-NaYF4: Yb<3+>, Tm<3+> and a photocatalytic material Degussa P25, wherein the up-conversion material is used for absorbing near-infrared light which is converted, so that ultraviolet light is emitted, and the utilization of near-infrared light is realized by exciting the photocatalytic activity of TiO2, and the utilization efficiency of sunlight in light-catalyzed reaction is increased. The near-infrared light compound photocatalyst can be applied to the field of light catalysis environmental management.

A preparation method for visible light responding TiO2 mixed crystal which utilizes diatomite as a basal body and relates to photocatalysis and material chemistry technical field. The method comprises the steps of: 1. preparing titanium dioxide mixed crystal; 2. activating diatomite; 3. loading the prepared titanium dioxide mixed crystal on the activated diatomite, and preparing titanium dioxide compound photocatalyst which has diatomite as the basal body and is visible light responding. The catalyst produced by adopting the preparation method of the invention has high specific surface area, and has fair degradation efficiency to organisms in practical agricultural chemicals and waste water under visible light irradiation as to Degussa P25 under ultraviolet light irradiation. Furthermore,the catalyst can be recycled and has high repeating using efficiency.

The invention provides core-shell structure Ag / TiO2 / ZnO nanowires, wherein a layer of TiO2 coats Ag nanowires externally and ZnO nanorods are inductively grown on the TiO2 layer. A preparation method includes the steps of: 1) dispersing silver nanowires in ethanol and adding tetrabutyl titanate and deionized water to perform a hydrothermal reaction to produce core-shell structure Ag / TiO2 nanowires; and 2) dispersing the core-shell structure Ag / TiO2 nanowires in zinc oxide sol, uniformly mixing the components and performing washing and separation, and adding the mixture to a mixed water solution of zinc nitrate and hexamethylene tetramine to perform a reaction to obtain the core-shell structure Ag / TiO2 / ZnO nanowires. The method achieves three-phase composition of one-dimensional Ag nanowires with TiO2 and ZnO, so that stability and charge carrier separation efficiency of the material are greatly improved. The photo-catalytic performance of the nanowires is significantly better than that of commercial Degussa P25 nanopowder, so that the nanowires have important application prospect in the fields of environment treatment with photo catalysis and dye-sensitized solar cells.

The invention belongs to the technical field of preparation of composite nano materials, and discloses a silver enhanced lignin carbon / nano titanium dioxide compounded photocatalyst, a preparation method thereof and application of the silver enhanced lignin carbon / nano titanium dioxide compounded photocatalyst in the field of photocatalysis. The method comprises the following steps: mixing lignosulphonate with alkyl trimethyl ammonium bromide and carrying out hydrophobic modification to obtain a lignin complex; adding the lignin complex, a titanium dioxide precursor and a water-soluble silversalt in ethanol to obtain an ethanol solution, adding the ethanol solution in water and reacting to obtain a Ag / lignin / TiO2 compound; and heating and calcining to obtain the silver enhanced lignin carbon / nano titanium dioxide compounded photocatalyst. The invention further provides the silver enhanced lignin carbon / nano titanium dioxide compounded photocatalyst prepared by the method and application of the silver enhanced lignin carbon / nano titanium dioxide compounded photocatalyst in the field of photocatalysis. The silver enhanced lignin carbon / nano titanium dioxide compounded photocatalysthas good photocatalytic degradation effect on sulfamethazine as antibiotic, and the degradation rate is 6.3 tims that of commercial Degussa P25 under the condition of visible light.

The invention provides a preparation method of a hollow silver phosphotungstate visible-light-induced photocatalyst, relates to a preparation method of the silver phosphotungstate visible-light-induced photocatalyst, and aims at solving the problems that the conventional silver phosphotungstate is prepared at a relatively low temperature, has low degree of crystallinity and poor stability, always generates relatively large crystals so that the specific surface area is small, and therefore, the photocatalytic activity is relatively low. The preparation method comprises the following steps of: 1, preparing a suspension turbid liquid; 2, preparing powder; and 3, roasting. The hollow silver phosphotungstate visible-light-induced photocatalyst prepared by the method has the characteristics that the specific surface area is large, a hollow structure is provided, and the visible-light catalytic activity is higher than that of common silver phosphotungstate and commercial Degussa P25. The preparation method provided by the invention is applied to preparation of the hollow silver phosphotungstate visible-light-induced photocatalyst.