95 results about "Anatase" patented technology

The invention discloses a preparation method of TiO2 powder with a rutile and anatase core-shell structure, and particularly relates to the technical field of photocatalytic material preparation. According to the method, rutile phase TiO2 powder is used as a core material, a titanate intermediate layer is formed on the surface of a particle through an accurately controlled hydrothermal alkali treatment process, and then a surface layer phase is converted into an anatase phase through acid pickling treatment and controllable heat treatment, so that a complete core-shell heterojunction structure is constructed. The process flow is relatively simple, the cost is controllable, the phase structure conversion rate is high, and the shell thickness can be accurately regulated and controlled. The obtained TiO2 core-shell structure powder has excellent structural stability of a rutile phase and high surface reaction activity of an anatase phase, and shows remarkably enhanced photocatalytic degradation performance under the condition of ultraviolet irradiation, and the catalytic efficiency of the TiO2 core-shell structure powder is greatly improved compared with that of single rutile phase TiO2; and a new process method is provided for large-scale preparation of efficient photocatalytic materials.

Titanium dioxide (TiO2) forms the basis of devices for applications including sensing devices, solar cells, photo-electrochromics, and photocatalysis. Such devices exploit different phases of TiO2 within such devices and accordingly it would be beneficial to have an amorphous TiO2 precursor which allows crystalline phase spatial patterning, for the crystallization of the amorphous TiO2 precursor to be triggered at low energies, and with the crystalline phase controllable at room-temperature without necessitating complex handling whilst providing TiO2 phases that are stable over a prolonged period of time. Accordingly, there are provided processes for providing a TiO2 precursor and controlling the conversion of the TiO2 precursor from amorphous-to-anatase, amorphous-to-rutile, amorphous-to-mixture of anatase / rutile or from amorphous-to-anatase-to-rutile in a simple and efficient manner.

The present disclosure relates to a hierarchical porous titanosilicate molecular sieve containing framework titanium and anatase and a preparation method and application thereof. The titanosilicate molecular sieve has Ti 2p 3 / 2 XPS characteristics: the titanosilicate molecular sieve has spectral peaks at binding energy N1 and N2 positions; wherein the N1 is 459.2±0.2ev, the spectral peak peak area of the titanosilicate molecular sieve at the binding energy N1 position is recorded as A1; the N2 is 460.5±0.5ev, the spectral peak peak area of the titanosilicate molecular sieve at the binding energy N2 position is recorded as A2; X1 defined as below formula (1) is any value between 0.8-2.2ev: X1=N2-N1 formula (1); X2 defined as below formula (2) is any value between 0.1-0.8: X2=A2 / A1 formula (2). The present disclosure can exert the synergistic effect of framework titanium and anatase, can effectively improve the conversion rate of cyclohexanone oxime and the selectivity of caprolactam in the gas phase Beckmann rearrangement reaction of cyclohexanone oxime, and prolong the catalyst life.

The present disclosure belongs to the technical field of material synthesis and utilization of renewable clean energy, and provides a red titanium dioxide heterojunction, and a preparation method therefor and the use thereof. The preparation method for a red titanium dioxide heterojunction comprises: forming a first precursor of B-doped titanium dioxide; calcining the first precursor at a high temperature to obtain a second precursor of a B-doped titanium dioxide heterojunction; and mixing any one of (NH4)2TiF6, NH4TiOF3 and (NH4)2TiOF4 with the second precursor, followed by a nitridation treatment in an ammonia gas flow to obtain a red titanium dioxide heterojunction uniformly doped with a rutile phase and an anatase phase. In the present disclosure, titanium dioxide in a rutile phase can be nitrided by means of an ammonium fluotitanate treatment, such that a red titanium dioxide heterojunction uniformly doped with both a rutile phase and an anatase phase is formed, which heterojunction exhibits relatively high water oxidation activity in a photocatalytic water decomposition reaction.

Provided is a titanium oxide powder, wherein the A / BET specific surface area is 2.3×10-5[ms-1 / (m2 / g)] or higher when calculated from the BET specific surface area and the inverse A of the spin-spin relaxation response time T2 measured by performing pulsed NMR on a liquid mixture in which the BET specific surface area measured via the nitrogen adsorption method is at least 80m2 / g and less than 300m2 / g, the anatase content of the crystal phase measured by the powder X-ray diffraction (XRD) method is 90% or more, and the titanium oxide content prepared using ion-exchanged water is 10 mass%.

A glass article comprising a photocatalytic coating including a titanium nitride layer and an outer titanium oxide layer, preferably at least partially in anatase form, said article being configured to impart a blue colour in transmission to a multiple glazing unit in which it constitutes the outer face, said multiple glazing unit further comprising a low-emissivity coating on another face of said multiple glazing unit, in particular face 2 or 3.

The application provides a method for preparing an M-phase VO2 film by a light-assisted spray pyrolysis method and the M-phase VO2 film prepared by the method, and belongs to the field of nanometer materials. The method comprises the following steps: (1) preparing a vanadium dioxide spraying liquid: adding vanadium oxyacetonylacetone into anhydrous methanol, stirring and aging to obtain a vanadium dioxide spraying liquid with ultraviolet photosensitive properties; (2) preparing a vanadium dioxide film: introducing the vanadium dioxide spraying liquid in step (1) into an atomizer and spraying onto a substrate coated with a TiO2 anatase phase under ultraviolet light irradiation to obtain the M-phase VO2 film. The method enables vanadium ions to be chelated in the sol by stirring, and the vanadium dioxide spraying liquid has ultraviolet photosensitive properties. The purity of the VO2(M) film is improved by introducing a titanium dioxide transition layer, and the microstructure of the VO2(M) film is improved by ultraviolet light irradiation, thereby improving the visual transmittance and solar light regulation rate of the VO2(M) film.

The invention discloses a full-spectrum response type aerogel photocatalyst as well as a preparation method and application thereof. The full-spectrum response type aerogel photocatalyst has a multi-heterostructure, and the multi-heterostructure comprises an in-plane heterostructure of amorphous carbon, graphite carbon and a BCN ring and a TiO2 mixed crystal phase structure of anatase type TiO2 and rutile type TiO2. The catalyst can be applied to preparation of methanol through photo-thermal catalytic reduction of CO2 in any single wave band range or combined wave band range in ultraviolet light, visible light and near-infrared light; the preparation method of the full-spectrum response type aerogel photocatalyst comprises the following steps: a) preparation of reduced TiO2 nanoparticles; b) preparation of aerogel; and c) high-temperature carbonization. The aerogel photocatalyst not only can realize full-spectrum response, but also can realize in-situ generation and regulation of oxygen vacancies in photo-thermal catalysis, so that the efficiency of reducing CO2 to prepare methanol is improved.

The invention relates to the technical field of formaldehyde pollution treatment materials, and discloses a photocatalyst for degrading formaldehyde and a preparation method thereof, and the photocatalyst contains an activated carbon substrate, anatase TiO2 and modified nitrogen-sulfur co-doped carbon quantum dots. Wherein the carbon quantum dots are prepared from a hydroxyl-containing aromatic dianhydride compound, a carbon source compound and an amino-containing nitrogen-sulfur donor compound through a hydrothermal reaction, and can enhance formaldehyde adsorption and broaden light response to a visible light region; the crystal form and the hydroxyl content of TiO2 are regulated and controlled through ammonium fluoride; after being pretreated by nitric acid, the activated carbon and other components form a chemical cross-linked network, and the photocatalyst solves the problems that a traditional photocatalyst material is prone to adsorption saturation and low in light utilization rate.

To provide a method for producing a titanium smelting raw material by which impurities can be separated and removed from ilmenite ore at a low cost in a short time.SOLUTION: An ammonium salt as a reactant is mixed with a pulverized product of ilmenite ore to form a mixture, and the mixture is heat-treated to obtain a reaction product, which is then dissolved in a solvent to form a suspension. A precipitate containing high-concentration TiO2 can be obtained by solid-liquid separation into a solid residue and a leachate and heating the leachate. The stepwise calcination of the precipitate makes it possible to produce anatase and rutile, respectively, with a high TiO2 concentration.SELECTED DRAWING: Figure 1

The invention provides photocatalyst nanoparticles for air sterilization and a preparation method of the photocatalyst nanoparticles. The preparation method of the photocatalyst nano-particles for air sterilization comprises the steps of preparing nitrogen-doped titanium dioxide precursor sol, preparing nitrogen-doped titanium dioxide nano-particles, preparing a second mixed system and preparing Ag / Cu bimetallic loaded nitrogen-doped titanium dioxide nano-particles. According to the preparation method, the nitrogen doping amount, the calcining temperature and the heat preservation time are synergistically optimized, so that the obtained nitrogen-doped TiO2 nanoparticles have relatively high crystallinity and relatively large specific surface area while keeping stable existence of an anatase phase, thereby improving the separation efficiency of photo-induced electron-hole pairs and the number of surface active sites; under the irradiation of visible light, more hydroxyl free radicals, superoxide anion free radicals and peroxides can be generated, and bacteria, viruses and volatile organic compounds in the air can be efficiently oxidized, decomposed and inactivated. The invention also provides an air filtration nanofiber membrane.

This invention provides a titanium dioxide supported catalyst with titanium vacancies, its preparation method, and its application. The preparation method includes the following steps: (1) mixing titanium dioxide raw material with a fluorine-containing etchant and performing etching treatment; separating the resulting mixture into solid and liquid components; and heat-treating the resulting solid to obtain a titanium dioxide support rich in titanium vacancies; (2) mixing an active metal precursor solution with the titanium dioxide support to load the active component; and activating the solid obtained after solid-liquid separation to obtain a titanium dioxide supported catalyst. This invention provides a simple, low-cost, and easily scalable HF etching method for preparing anatase supports rich in titanium vacancies, thereby obtaining a Pd-based catalyst that possesses ultra-high room temperature formaldehyde oxidation activity requiring only room temperature treatment.

The application relates to a rutile phase titanium dioxide supported palladium monatomic catalyst and application thereof, wherein the rutile phase titanium dioxide supported palladium monatomic catalyst is composed of a carrier and an active component, palladium species is dispersed on the rutile phase titanium dioxide in a monatomic form, the rutile phase titanium dioxide supported palladium monatomic catalyst is synthesized by using a crystal phase engineering and thermal atomization method, and the particle size of the rutile phase titanium dioxide supported palladium monatomic catalyst is 30-40 nm. The rutile phase titanium dioxide supported palladium monatomic catalyst is synthesized by using a crystal phase transformation method, realizing the transformation of the carrier from a anatase phase to a rutile phase through high-temperature treatment, and realizing the atomic dispersion of palladium species by using a thermal atomization principle; the rutile phase catalyst is used for a Sonogashira reaction, and has the advantages of good selectivity, high conversion rate, strong stability and the like.

The invention belongs to the technical field of marine corrosion prevention, and particularly relates to a titanium dioxide nanotube array and a preparation method and application thereof. The preparation method comprises the following steps: cleaning and drying a titanium sheet in sequence; the dried titanium sheet is subjected to primary anodic oxidation in a fluorine-containing ethylene glycol electrolyte, and an oxidation layer generated on the surface of the titanium sheet through primary anodic oxidation is removed; the titanium sheet with the oxide layer removed is subjected to anodic oxidation in an ethylene glycol composite electrolyte containing fluorine and phosphate; the titanium sheet subjected to anodic oxidation is annealed, and an anatase type titanium dioxide nanotube array with the lotus-root-shaped surface is obtained; wherein the oxidation voltage of anodic oxidation ranges from 18 V to 22 V, and the temperature ranges from 15 DEG C to 16 DEG C. And the photo-generated cathode protection performance of the titanium dioxide nanotube array on the stainless steel is obviously improved.

The disclosed method for manufacturing barium titanate particles comprises: a process (i) for preparing titanium hydroxide by simultaneously neutralizing an aqueous titanium halide solution and an alkaline substance under predetermined conditions; a process (ii) for preparing a slurry of the titanium hydroxide; a process (iii) for preparing a titanium compound by adding a predetermined amount of inorganic acid and an organic acid to the slurry and then maintaining the slurry at a temperature in the range of 40 to 90°C; and a process (iv) for synthesizing barium titanate particles by hydrothermal synthesis using a raw material containing the titanium compound. The titanium compound contains amorphous titanium hydroxide and anatase-type titanium dioxide. The specific surface area of ​​the titanium compound is 250 m² / g or more.

The invention discloses a BiOCl / TiO2 photocatalyst prepared by an electrochemical method as well as a preparation method and application thereof, and the preparation method of the BiOCl / TiO2 photocatalyst comprises the following steps: 1) placing a Ti sheet subjected to surface pretreatment in an aqueous solution containing F <-> for anodic oxidation, and then placing the Ti sheet in a muffle furnace for heat treatment to obtain an anatase type TiO2 nanotube; 2) taking the TiO2 nanotube as a working electrode, and obtaining Bi nanocrystals in a water solution containing Bi (NO3) 3 with a certain concentration, lignin calcium benzenesulfonate and an emulsifier OP-10 by adopting a pulse electrodeposition method; 3, the sample with the Bi nanocrystals deposited is subjected to electrooxidation in a Cl <-> solution under the specific pH condition, and the BiOCl / TiO2 photocatalyst is obtained.The BiOCl / TiO2 photocatalyst prepared through the electrochemical method has the advantages of being stable in structure, high in CO2 photocatalytic reduction activity and high in product selectivity.

glass article comprising a photocatalytic coating including a layer of titanium nitride and an external layer of titanium oxide, preferably partially in anatase form, said article being configured to impart a blue color in transmission to a multiple glazing in which it constitutes the front face, said multiple glazing further comprising a low-emissivity coating on another face of said multiple glazing, in particular face 2 or 3.

The application discloses a preparation method and application of high-stability lead-free halide core-shell nanocrystals and belongs to the field of semiconductor material preparation. The nanocrystal core layer is and the shell layer is an in-situ grown anatase phase / amorphous phase. Tetrabutyl titanate is used as a single titanium source, and one-step coating is carried out through precursor solution preparation-titanium source in-situ hydrolysis-anti-solvent induction-post treatment. Optionally, a chelating agent can be introduced to passivate defects, and a polymer+inorganic dense layer double-coating can be used to strengthen the stability. The oxygen-free preparation conditions are optimized, and one or mixed halogen nanocrystals can be prepared by passing nitrogen gas throughout the whole process, so that the problems of poor water oxygen and thermal stability of traditional nanocrystals are solved. In-situ coating forms an interface bonding, and the fluorescence retention rate is greater than or equal to 80% in air for three months, and the Cl / Br phase can reach greater than or equal to 90%. The process is simple and easy to scale, and the material can be widely applied to the fields of photocatalysis, flexible X-ray imaging, LED, photoelectric detection and the like, and has significant academic and industrial application values.

The invention belongs to the technical field of photoelectrocatalysis and environmental governance, and particularly relates to a zinc cadmium sulfide / titanium dioxide composite material, a preparation method thereof and application of the zinc cadmium sulfide / titanium dioxide composite material as a composite photoanode in hydrogen sulfide photoelectrocatalytic decomposition. The zinc cadmium sulfide / titanium dioxide composite material provided by the invention comprises an anatase phase TiO2 nanotube array arranged on the surface of a conductive substrate; and the CdZnS nano-particles are deposited on the anatase phase TiO2 nano-tube array. The zinc cadmium sulfide / titanium dioxide composite material provided by the invention is applied to hydrogen sulfide photoelectrocatalytic decomposition as a composite photo-anode, has high catalytic activity, high stability and high product selectivity, realizes synchronous H2 generation and H2S detoxification, and does not need complex separation steps. According to the invention, a novel material design strategy is provided for a high-performance PEC-H2S conversion system, and a technical insight is provided for green resource utilization of sulfide pollutants.

A method for selective hydrogenation of pyrolysis gasoline, comprising contacting pyrolysis gasoline with a hydrogenation catalyst in the presence of hydrogen, the hydrogenation catalyst comprising a composite oxide, the composite oxide comprising alumina and titania, the specific surface area of the composite oxide being represented by X m 2 / g, the average pore diameter of the composite oxide being represented by Y nm, wherein the ratio of X to Y is 5 to 30; in the composite oxide, the titania in an anatase crystal phase accounts for 95wt% to 100wt% of the total titania. The method can selectively hydrogenate dienes in the C6-C8 fraction and the C9-C10 fraction of pyrolysis gasoline, and has the advantages of good low-temperature activity, good adaptability to raw materials, and high stability.

The invention discloses a method for preparing nano titanium dioxide by using chlorination process titanium dioxide waste acid. The method comprises the following steps: performing membrane separation and impurity removal on the titanium dioxide waste acid; selectively extracting Sc and V to obtain enriched liquid; selectively extracting iron ions in the enrichment liquid to obtain a titanium solution and a strip liquid; performing reverse osmosis concentration on the titanium solution to obtain a concentrated solution; performing microwave-assisted hydrolysis on the concentrated solution to obtain a precursor; the precursor is subjected to calcination treatment, and anatase type nano titanium dioxide is obtained; moreover, the particle size of the anatase type nano titanium dioxide is 10-100 nm, and the content of an anatase phase is greater than or equal to 80% by mass. According to the method, the titanium recovery rate is larger than 95%, rare metals such as Sc and V are synchronously recovered, and efficient recovery of resources is achieved; the nano TiO2 can be used in the fields of photocatalysis, new energy and the like, and the added value of the product is relatively high; the heavy metal content is low after waste acid treatment, the circular economy mode of treating waste with waste is achieved, and the method is environmentally friendly and has good popularization prospects.

This invention discloses a lanthanum-doped PCN / MXene composite nanofiber, using La as the dopant element. The composite nanofiber is composed of zero-dimensional TiO₂ nanoparticles derived from MXene nanosheets, La-based species, and one-dimensional porous nitrogen-doped carbon (PCN) nanofibers. The TiO₂ nanoparticles contain anatase and rutile phases, forming a biphase TiO₂ heterostructure. The composite nanofiber exhibits a reflection loss value below -10 dB. The preparation method includes the following steps: 1. Preparation of MXene nanosheets; 2. Preparation of lanthanum-doped PCN / MXene composite nanofibers. The mass ratio of lanthanum nitrate hexahydrate to MXene nanosheets is 1:1; the mass ratio of polyacrylonitrile to MXene nanosheets is 4:1. The resulting composite nanofiber, with a matching thickness of 1.95 mm, exhibits a reflection loss value of -61.55 dB and an effective absorption bandwidth of 5.7 GHz (12.3–18.0 GHz).

The invention relates to a cobalt-based Fischer-Tropsch synthesis catalyst and a preparation method and application thereof.Based on the total weight of the catalyst, the catalyst is prepared from, by weight, 10%-40% of Co, 0.05%-2.0% of halogen elements, 0.05%-5% of auxiliary components and the balance TiO2 carrier; wherein the auxiliary agent component is selected from one or more of transition metal elements; the TiO2 carrier comprises a rutile phase and an anatase phase, and based on the total weight of the TiO2 carrier, the content of the rutile phase is 65-95 wt%. According to the invention, the catalytic activity and stability of the Co-based Fischer-Tropsch synthesis catalyst can be improved.

The present application relates to the technical field of mineral exploration, and discloses a method for estimating residual deposit type anatase mineralization probability based on multi-source parameters, comprising: determining geological data of a geographical area, and collecting sample characteristics of a sampling geological sample; extracting a first characteristic index set to determine regional classification of the geographical area, wherein the regional classification comprises a conventional survey area, a primary mineralization mode area and a secondary mineralization mode area; extracting a second characteristic index set from the geological data to calculate a standard mineralization probability; calculating a weathering correction coefficient and a maturity correction coefficient; correcting the standard mineralization probability to generate a mineralization probability, and determining whether the geographical area is a high-potential target area according to the mineralization probability. According to the above technical solution, the mineralization probability determination standard can be determined under different conditions, and the standard correction can be determined, so as to realize the judgment of the high-potential target area.

The invention discloses a porous SiO2 / TiO2-ZnO composite super-hydrophilic coating and a preparation method thereof, and belongs to the technical field of functional coatings and surface engineering. The preparation method comprises the following steps: carrying out ultrasonic dispersion on anatase type TiO2 and ZnO in a solvent to form a uniform composite dispersion liquid, mixing the uniform composite dispersion liquid with mesoporous SiO2 precursor sol prepared by a template method under an acidic condition, and adding a silane coupling agent and a spiropyrane derivative to carry out an interface bonding reaction to obtain composite sol; the composite sol is applied to the surface of a base material through a coating process, and the composite sol is obtained after drying and curing treatment. According to the coating prepared by the invention, TiO2 and ZnO form a heterojunction to enhance the photo-generated charge separation efficiency, and spiropyrane derivatives are introduced, so that synchronous improvement of efficient photocatalytic self-cleaning and controllable light response repair functions is synergistically realized in a single coating; the coating can be widely applied to the fields of building glass, automobile windows, solar cell cover plates and the like which need self-cleaning, antifogging and surface function maintenance.

The BET specific surface area measured by nitrogen adsorption method is 80m 2 / g or more 300m 2 / g or less, and the anatase content of the crystalline phase measured by powder X-ray diffraction (XRD) is 90% or more; The A / BET specific surface area calculated from the reciprocal A of the spin-spin relaxation response time T2 measured by pulse NMR for a mixed solution containing 10 mass% titanium oxide prepared using ion-exchanged water and the BET specific surface area was 2.3 × 10 -5 [ms -1 / (m 2 / g)] or more.

The invention relates to the technical field of composite catalysts, in particular to a defect-state porous TiO2 catalyst as well as a preparation method and application thereof. The technical key points are as follows: the defect-state porous TiO2 catalyst is of a hexagonal hollow structure, the diameter is 150-250 nm, the hollow diameter is 40-60 nm, and the defect-state porous TiO2 catalyst is in an anatase crystal form and is used for catalyzing synthesis of polyethylene furandicarboxylate. According to the preparation method disclosed by the invention, a three-step core process of nano-scale silicalite-1 molecular sieve hard template synthesis, precise alkali etching and hydrogen atmosphere calcination is adopted, the anatase phase defect state porous TiO2 catalyst with a regular hexagonal hollow structure and a pure crystal form is successfully prepared, and deep synergy of structural design and catalytic performance is realized.

The invention discloses a preparation method of titanium dioxide nanocrystals and a stable dispersion liquid of the titanium dioxide nanocrystals, and belongs to the field of titanium dioxide. The preparation method comprises the following steps: mixing a titanium source and an alcohol solvent to form an alcohol solution of the titanium source; dropwise adding acid, mixing and stirring, then dropwise adding water, and continuously mixing and stirring; carrying out reflux reaction, cooling after the reaction is finished, and separating to obtain titanium dioxide nanoparticles; and the boiling point of the alcohol solvent is 150-260 DEG C. The preparation method also comprises the following steps: washing the titanium dioxide nanoparticles, dispersing the titanium dioxide nanoparticles in a solvent, dropwise adding the surface modification ligand, uniformly stirring, separating and drying to obtain yellow powdery solid particles. The method overcomes the problems of insufficient TiO2 crystallization, low electron mobility and poor dispersion stability in the existing low-temperature sol-gel acid catalysis system, is a synthetic method capable of forming high-mobility anatase phase TiO2 nanocrystals at a relatively high temperature, and realizes long-term stable dispersion of the anatase phase TiO2 nanocrystals in ethanol / isopropanol and other solvents.