99results about How to "Improve photon quantum efficiency" patented technology

The invention discloses an efficient photochemical catalysis air purifier, which consists of a machine box, a filtering device, a fan and a photochemical reacting room. The photochemical reacting room includes a three-dimensional honey comb ceramic halftone which loads a photocatalyst of nano-composite TiO2 and an ultraviolet radiation light which irradiates towards the honey comb ceramic halftone. The photocatalyst is TiO2 adulterated with little iron, lanthanum or cerium hydronium, and the quantity of the added hydronium is 0. 005 percent to 0.5 percent of the total weight. The three-dimensional honeycomb ceramic net of a photocatalyst carrier is a honeycomb ceramic, which is provided with 100 to 600 holes per square inch. The polluted air follows a wind inlet fan to go through the filtering device which consists of a primary filtering net and an active carbon filtering net, and granular articles are removed and volatile organic matters with peculiar smell are absorbed; the gas after primary purifying goes into the photochemical reacting room which is provided with the ultraviolet radiation light, the photocatalyst of nano-composite TiO2 and the three-dimensional honey comb ceramic net, and under an effect of a strong oxidizer which is produced by the reaction of the ultraviolet radiation and the photocatalyst, various organic pollutants in the air can be effectively decomposed.

A nitrogen doped nano-class TiO2material with photocatalytic activity is prepared by doping N into TiO2 crystal. It features that its energy gap can be triggered by visual light, realizing the full-frequency absorption to visual light for increasing its light quantum efficiency.

The invention discloses a method for preparing TiO2/BiVO4 composite photocatalyst by a MH (microwave-hydrothermal) method. The method comprises the steps as follows: Bi(NO3)3 5H2O and (NH4)2TiF6 are resolved in HNO3 to form mother salt solution A, NH4VO3 is resolved in NaOH solution to form mother salt solution B, the mother salt solution A and the mother salt solution B are mixed uniformly to form precursor solution, the precursor solution is placed in a microwave hydrothermal reaction kettle for microwave hydrothermal reaction and is cooled after the reaction is over, and yellow sediment in the reaction kettle is taken out and is washed and dried. According to the invention, TiO2/BiVO4 powder is synthesized quickly through a microwave-hydrothermal synthesis technology, and the photocatalysis performance of the powder is better because TiO2 particles are carried on the surface of BiVO4 to serve as an electron acceptor, and then compounding of a photon-generated carrier is inhibited, further the photocatalysis efficiency of pure-phase BiVO4 powder can be improved.

The invention discloses a preparation method of a platinum-loaded TiO2 nanotube photocatalyst with high-efficiency photocatalysis activity, which is characterized by comprising the following steps of: taking low-cost TiO2 and sodium hydroxide as raw materials; milling in the process of hydro-thermal reaction; then acid washing and roasting to obtain an anatase TiO2 nanotube as a carrier; enabling the inner surface of the anatase TiO2 nanotube to absorb chloroplatinic acid; and enabling the inner surface of the nanotube to be loaded with platinum particles by taking ethanol as a hole depletion agent by adopting a photo-reduction settling method. The light quantum efficiency is improved on the premise that the adsorption capacity for pollutants is not influenced. Compared with common TiO2 photocatalysts, the platinum-loaded TiO2 nanotube catalyst has higher photocatalysis activity.

The invention relates to a composite photocatalyst membrane material with a hierarchical pore structure and a preparation method thereof. A basal body of the composite photocatalyst membrane material is a transition a metal-doped hierarchical porous TiO2 and ZnO compound semiconductor membrane material membrane. The preparation method comprises the following steps: firstly preparing a TiO2 and ZnO compound photocatalyst precursor containing pore-forming agents P123, F127, PMMA (Polymethyl Methacrylate), PEG (Polyethylene Glycol), CTAB (Cetylt Trimethyl Ammonium Bromide) and transition metal Fe, Ni. Co, Mo, Cu, Pt, Au, Pd and Ag; then assembling the transition metal-modified ZnO/TiO2 hierarchical porous composite photocatalyst membrane material on FTO (Fluorinedoped Tin Oxide), ITO (Indium Tin Oxide) and Ni sheets and other carriers through a spray pyrolysis method, a dip-coating method, a spin-coating method, a silk-screen printing method, a doctor blade method and other coating methods; and finally, directly carrying out in-situ growth on a carbon nano tube on the composite photocatalyst membrane material through a chemical vapor deposition method. The hierarchical porous composite photocatalyst membrane material has the advantages of high photocatalytic activity, stable membrane binding, simple preparation process and easiness in industrialization realization.

The invention relates to a titanium dioxide microsphere array supported platinum visible-light photocatalyst and a preparation method, and belongs to the field of titanium dioxide photocatalysis. A catalyst carrier is a TiO2 microsphere array prepared by a two-step template method, with the diameter of the microsphere being 100-300 nm and has an anatase phase structure. A chloroplatinic acid is used as a platinum source, and a Pt-deposited TiO2 microsphere array is obtained by hydrogen gas reduction. The microsphere array structure is beneficial to increase absorption to light of TiO2; the platinum particles obtained by hydrogen gas reduction have relatively small particle size and uniform distribution, and can effectively increase separation of photogenerated electrons and holes, so that quantum yield is increased; and the both of the above points are beneficial to increase of photocatalytic efficiency. The method is easy to operate and control, has good visible-light photocatalytic performance, and has good application prospects.

The invention discloses a novel ZnO/Cu2O heterojunction photocatalytic material and a preparation method thereof. According to the material, soluble copper salt is dissolved in 50 mL of deionized water, hierarchical ZnO micro-nano flowers are dispersed into the solution uniformly under magnetic stirring condition, then proper amount of sodium hydroxide and citric acid are added in sequence, the materials react in a water bath at 50 DEG C for 30 min, and a hierarchical ZnO micro-nano flower structure modified with rod-shaped Cu2O nanoparticles is obtained. The preparation technology of the novel ZnO/Cu2O heterojunction photocatalytic material is simple and convenient, expensive equipment is not involved, the product is novel in morphology and larger in specific surface area, response of ZnO in the visible light range is extended, furthermore, a built-in electric field produced in a heterojunction at a compound interface of the product can promote effective separation of photo-induced electron-holes remarkably and inhibit recombination of the photo-induced electron-holes, so that the photo-quantum efficiency is increased obviously, and excellent photocatalytic performance and cycle stability are shown.

The invention discloses a preparation method of a supported-type precious metal photocatalyser. The preparation method comprises the following steps: step 1, preparing single-layer oxidized graphene; step 2, preparing titanium dioxide loaded with graphene on the surface; step 3, preparing a titanium dioxide catalyst loaded with graphene and precious metal, namely preparing the supported-type precious metal photocatalyser; the supported-type precious metal photocatalyser utilizes the ultraviolet absorption ability of graphene, and the graphene material loaded on titanium dioxide is further adopted, so that the absorption of ultraviolet light is increased, absorbed light energy is transferred to titanium dioxide and the precious metal catalyst through energy resonance, the effect of more fully utilizing the light energy is achieved, the photochemical catalytic capacity of precious metal is improved, the dosage of the precious metal photocatalyser is reduced, and the production cost of enterprises is further reduced.

The invention discloses a method for preparing a nanometer TiO2 photocatalytic indoor purificant as follows: under the combined action of microwave radiation and higher fatty acid and nonionic surfactants in a proper proportion, the purificant can be prepared under common temperature calcination. In a retort, deionized water is firstly added, a complex surfactant is added under stirring, a hydrolysis inhibitor is used for adjusting the pH value of the solution, then a dipolar organic solvent is added, and the mixture is heated to be slightly boiled, and then titanate is added until a white gel is formed; the gel is distilled by microwaves, washed by ammonia water after the temperature is cooled down, then dried by microwaves, and cooled for discharging, thereby obtaining the nanometer TiO2 photocatalytic indoor purificant responded by visible light. The nanometer TiO2 prepared by the invention has obvious absorption in a visible light region, the wavelength of which is 400-650 nm, and has higher bacteriostatic rate to Escherichia coli, staphylococcus aureus and bacillus subtilis under an indoor fluorescent lamp or an energy-saving lamp; the production cost is low; and the production efficiency is high.

The invention relates to a preparation method of a nanometer titania/molybdenum disulfide composite film. The preparation method includes: respectively preparing nanometer titania solution and molybdenum disulfide of a spherical structure, subjecting the nanometer titania solution and molybdenum disulfide to polytetrafluoroethylene reaction kettle and ultrasonic treatment to obtain colloid of nanometer titania/molybdenum disulfide composite, spraying the colloid onto a roughened stainless steel wire mesh to form the nanometer titania/molybdenum disulfide composite film, and taking silver nitrate solution as electrochemical deposition electrolyte, the stainless steel wire mesh as a cathode and graphite as an anode to deposit silver nanoparticles onto the nanometer titania/molybdenum disulfide composite film to obtain the nanometer titania/molybdenum disulfide composite with the silver nanoparticles in inverse point array. The prepared nanometer titania/molybdenum disulfide composite film can be widely applied to environmental pollution treatment.

The invention discloses a FeVO4/TiO2 porous catalyst film layer material for photo-Fenton combined catalysis and a preparation method of the FeVO4/TiO2 porous catalyst film layer material, belongs tothe technical field of photo-Fenton combined catalytic material preparation. Aiming at the lack of a method and a catalyst capable of efficiently combining photocatalysis and Fenton reaction at present, a micro-arc oxidation method is utilized; a TiO2 film layer containing Fe and V is generated on the surface of a titanium substrate, then the FeVO4/TiO2 porous catalyst film layer material is obtained through roasting in a protective atmosphere, photocatalysis and Fenton reaction are successfully and efficiently combined together, and the efficient catalyst capable of being used for degrading organic pollutants is obtained.

The invention relates to a photocatalytic multifunctional fiber material and a preparation method thereof, belonging to the technical field of materials. The invention mainly solves the technical problems that the decomposition rate of organic matters of the exiting fiber materials is low, the sterilizing and bacteriostatic effect is not obvious and the like. The fiber material is formed by polypropylene master batches and polypropylene slices. The preparation method comprises the following steps: converting tungstate into colloid; using rare earth oxide to prepare rare earth nitrate mixed solution; adding the colloid into the rare earth nitrate mixed solution and dripping dilute acid to form sol; adding catalyst promoter material in the sol to obtain wet gel; after drying and sintering the wet gel, conducting ultrasonic dispersion to obtain powder; adding dried polypropylene matrix, dispersing agent, coupling agent and defoaming agent in the powder and preparing polypropylene master batches through a screw extruder; and adding polypropylene slices in the polypropylene master batches and preparing the photocatalytic multifunctional fiber material through the screw extruder, a melt spinning technology and a deformation technology. The invention has the advantages of high organic matter decomposition rate, good sterilizing effect and the like.

The invention discloses an iron-nitrogen-doped titanium dioxide-loaded carbon fiber composite photocatalyst and a preparation method thereof, and belongs to the technical field of photocatalysts. The iron-nitrogen-codoped titanium dioxide-loaded carbon fiber composite photocatalyst ((Fe,N)/TiO2@CF for short) is prepared through sol and gel and an impregnating method; by introducing iron atoms and nitrogen atoms into the photocatalyst, the impurity energy level is introduced between a conduction band and a valence band of TiO2, the band-gap energy of the photocatalyst is reduced, and the visible photocatalytic performance of the photocatalyst is improved; loaded carbon fibers (CF for short) are utilized, therefore, the material is easy to recycle, the reuse performance of the photocatalyst is improved, effective migration of photo-induced electrons is improved, the recombination probability of electron holes is decreased, and the photo quantum efficiency of a catalytic material is improved.

The invention relates to a method for preparing organic chemicals through photocatalytic oxidation degradation of biomass, and belongs to the method for preparing the organic chemicals through the biomass. According to the photocatalytic oxidation method, a modified photochemical catalyst is used for being coupled with an oxidant, a photocatalytic oxidation system is established, so that the biomass is high-efficiently degraded under a mild condition, and a feasible way is further provided for extraction and utilization of high added value chemicals in the degraded products. The method comprises the following steps of firstly, synthesizing a metal-nonmetal load type TiO2 photochemical catalyst, then using a liquid phase chemical reagent as the oxidant, adjusting the pH value to be alkalic, performing irradiation with sunlight or ultraviolet light, and establishing the photocatalytic oxidation system. The system can effectively degrade organic macromolecules of the biomass into small molecules, and high added value chemicals comprise aldehyde, alkone, carboxylic acid and other aromatic compounds. The method disclosed by the invention has the advantages of cleanness, high efficiency, good selectivity, low cost and the like, can develop a new way for mild and rapid degradation of the biomass, and realize cleanness, the high efficiency and the comprehensive utilization of the biomass.

The invention relates to a preparation method of an amino-modified Pd/TiO2 photocatalyst. The preparation method comprises three steps of synthesizing TiO2 nanosheets with high-energy crystal faces [001], modifying the TiO2 nanosheets with thehigh-energy crystal faces [001] by use of APTMS and preparing the Pd/TiO2 photocatalyst. Compared with the prior art, the preparation method of the amino-modified Pd/TiO2 photocatalyst has the advantages that the amino-modification technology is adopted so that the dispersibility of noble metal particles can be greatly improved, and therefore, the degradation effect of the photocatalyst on methylene blue under ultraviolet is effectively improved.

The invention relates to a salt-containing wastewater resourceful treatment method, which concretely comprises the following steps of adopting an alkaline electrolysis water hydrogen producing device as a basis, adopting a photocatalyst film modified Ni plate as an anode, and adopting salt-containing wastewater as electrolyte. Through a photoelectrocatalysis process achieved by irradiating the anode by a light source, the aim of wastewater resourceful treatment including degrading organic pollutants, recovering metal ions and producing hydrogen is achieved. According to the salt-containing wastewater treatment method provided by the invention, not only can the metal ions in wastewater be well recovered and can the difficult-to-degrade organic pollutants be well removed, but also hydrogen can be produced. The method is simple in process, and has a good wastewater treatment effect.

The invention discloses a BiPO4-WO3 composite photocatalyst and a preparation method thereof, and belongs to the technical field of inorganic environment-friendly photocatalysis materials. According to the technical scheme, the preparation method of the BiPO4-WO3 composite photocatalyst comprises the steps that 1, sodium tungstate and sodium chloride are added into deionized water according to the molar ratio of 1:1, the pH value of the mixed solution is adjusted with hydrochloric acid to range from 0.5 to 1 and transferred into a hydrothermal reaction still, the hydrothermal reaction still is placed in a microwave digestion instrument, a microwave reaction is carried out for 10 min to 30 min at the temperature of 180 DEG C, cooling, washing and drying are carried out after the reaction is finished, and WO3 powder is obtained; 2, a bismuth nitrate water solution is prepared, sodium dihydrogen phosphate and the WO3 powder are added to form a mixed solution; 3, the mixed solution obtained in the step 2 is stirred for 1 h at room temperature and then transferred into the hydrothermal reaction still, the hydrothermal reaction still is placed in the microwave digestion instrument, a microwave reaction is carried out for 10 min to 30 min at the temperature of 180 DEG C, centrifugation, washing and drying are carried out after the reaction is finished, and the BiPO4-WO3 composite photocatalyst is prepared. According to the prepared BiPO4-WO3 composite photocatalyst, the utilization rate of sunlight and photocatalytic activity are effectively increased.

The invention discloses a chromium-silver co-doped nano TiO2 photo-catalyst, and a preparation method and the use thereof. By using a sol-gel method, the preparation method comprises the following steps: (1) adding butyl titanate into absolute ethyl alcohol, dropwise adding glacial acetic acid, and performing magnetic stirring and uniform mixing to obtain a solution A; (2) dissolving silver nitrate which corresponds to titanium particles and has a molar fraction of 0.1-1 percent, and chromic nitrate which has a molar fraction of 0.5-2.5 percent into distilled water, injecting into the absolute ethyl alcohol, dropwise adding the glacial acetic acid and dilute nitric acid, and stirring to obtain a solution B; (3) dropwise adding the solution B into the solution A, and stirring and aging the solutions to form gel; (4) drying the gel to obtain dried gel; and (5) grinding the dried gel into powder, and firing the powder in air at the temperature of 400-700 DEG C to obtain the chromium-silver co-doped nano TiO2 photo-catalyst. A chromium-silver co-doped nano TiO2 photo-catalytic material is fine and uniform in powder granularity, and high in photo-catalytic activity; the average particle size is 10-25nm.

An I doped photocatalytic polycrystal material with photocatalyzing performance under visual light contains Ti (54.70-59.95 wt.%), O (35.30-39.95) and I (0.10-10.00). It features that its energy gap is lowered to some extent for utilizing visual light (400-800 nm), that is, its energy gap can be triggered by visual light, realizing full-frequency absorption to visual light and increasing its light quantum efficiency.

A Cl doped nano-class TiO2 material with photocatalytic activity is prepared by doping Cl into TiO crystal. It features that its energy gap can be triggered by visual light, realizing the full-frequency absorption to visual light for increasing its light quantum efficiency.

A F doped photocatalytic polycrystal material with photocatalyzing performance under visual light contains Ti (44.6-52.7 wt.%), O (16.7-39.4) and F (7.9-38.7). It features that its energy gap is lowered to some etent for utilizing visual light (400-800 nm), that is, its energy gap can be triggere by visual light, realizing full-frequency absorption to visual light and increasing its light quantum efficiency.

The invention relates to a method for preparing a three-dimensional layered Ti-Fe alloy oxide photonic crystal electrode (Ti-Fe-O NTPC) with a high periodicity. The photonic crystal electrode is prepared by using ferrotitanium as a substrate and using a three-step electrochemical anodizing method. Compared with a conventional nanotube structure and a layered titanium dioxide nanotube without doped ferrum, the Ti-Fe-O NTPC novel electrode has high-efficient visible photoelectrocatalysis performance because the Ti-Fe-O NTPC has a high-periodicity ordered nanometer net which can be used as photonic crystal layer to increase light absorption and the use of the alloy substrate guarantees uniform doping of Fe and Ti at an atom level so as to promote electron transmission. The electrode has potential application value in the field of photocatalysis, photoelectrocatalysis, and new energy preparation and analysis detection.