111results about How to "High utilization rate of visible light" patented technology

The invention relates to a BiOCl-TiO2/diatomite photocatalyst and a preparation method thereof, belonging to the fields of nonmetal mine material deep processing and environmental engineering. The BiOCl-TiO2/diatomite composite photocatalysis material with visible light response is obtained by taking diatomite as a catalyst carrier and loading a BiOCl-TiO2 heterojunction catalyst on the surface and in pore channels of diatomite through a sol-gel method and a calcination crystallization method. According to the method, diatomite and nano BiOCl-TiO2 heterojunction with visible light response are compounded, and the pollutant adsorption and capture performance of the material and the dispersity and photocatalysis activity of the catalyst are improved by virtue of diatomite carrier effect. The loading type photocatalysis material has excellent photocatalysis activity to gas formaldehyde and liquid dyes under visible light, and has great potential application value in the field of treatment of gas formaldehyde and liquid dyes.

The invention discloses a composite nanometer titanium dioxide photocatalysis material and a preparation method thereof. The method includes the steps: titanium dioxide collosol, silicon dioxide collosol and propylene glycol monomethyl ether, of which the mass ratio is 1 to 4 to 10, are uniformly mixed to form composite collosol; porous ceramics are soaked in the composite collosol for 30 minutes; and the porous ceramics are taken out to be heated for 30 minutes at the temperature of 300 DEG C so as to obtain photocatalysis ceramics loaded titanium dioxide materials. Compared with the prior art, the invention has the technical scheme that modified silicon dioxide collosol is mixed in the titanium dioxide collosol, and the existing Ti-O-Ti bond is replaced by a Ti-O-Si bond, thereby reducing the titanium oxidation-reduction potential, enabling titanium dioxide light absorption wavelength to generate redshift, and improving the visible light utility ratio of titanium as well as the adhesive power and the hardness of a coating.

The invention relates to a preparation method of a high-activity titanium dioxide-boron modified carbon nitride catalyst and aims to solve the problems of low visible light utilization rate, serious charge recombination, difficulty in hole capture and poor light reducing capacity of a photocatalyst material prepared in the prior art. The preparation method of the high-activity titanium dioxide-boron modified carbon nitride catalyst is prepared in specific steps as follows: step one, preparation of a boron modified carbon nitride precursor solution; step two, preparation of boron modified carbon nitride; step three, preparation of titanium dioxide-boron modified carbon nitride composite, and the titanium dioxide-boron modified carbon nitride is obtained.

The invention relates to I-III-VI group 2 sulfide and particularly relates to an AgIn5S8-ZnS/MoS2 heterojunction composite photocatalyst prepared by utilizing a simple and rapid hydrothermal method. The AgIn5S8-ZnS/MoS2 heterojunction composite photocatalyst can be used for degrading a rhodamine B dye under visible light. The AgIn5S8-ZnS/MoS2 heterojunction composite photocatalyst is prepared by mixing and stirring AgIn5S8-ZnS nano crystals, ammonium molybdate tetrahydrate and thiourea, carrying out a hydrothermal reaction for 8 hours at 200 DEG C, and filtering, washing and drying after the reaction is finished, wherein the mass ratio of the MoS2 to the AgIn5S8-ZnS nano crystals is 1%-30%, and the optimal mass ratio of the photocatalytic performance is 5%. An experiment of degrading rhodamine B (RhB) under the visible light shows that the prepared composite photocatalyst has good photocatalytic activity.

The invention discloses a composite visible-light-induced catalyst and a preparation method and application thereof. The composite visible-light-induced catalyst is prepared from CNT-silver citrate and g-C3N4-PO43- through a precipitation method, wherein the CNT-silver citrate is prepared from CNT, sodium citrate and AgNO3 through surface complexing action, and the g-C3N4-PO43- is prepared from g-C3N4 and NaH2PO4 through surface phosphorylation. The preparation method includes the steps of preparation of the CNT-silver citrate, preparation of the g-C3N4-PO43- and preparation of CNT/Ag3PO4/g-C3N4. The composite visible-light-induced catalyst can be applied to treatment of antibiotic wastewater and has the advantages of high visible light utilization rate, stable presence in water and stable photocatalytic performance.

The invention discloses a preparation method of an oxide quantum dot modified graphene/titanium oxide photocatalysis material. The preparation method comprises following steps: modification with a conductive polymer is adopted so as to obtain a conductive polymer coated graphene; sol-gel method is adopted so as to prepare a sol from conductive polymer coated graphene, butyl titanate, and an oxidequantum dot; and aging, gelling, drying, grinding, and heat treatment are adopted to obtain the quantum dot modified graphene/titanium oxide porous nanometer catalysis material. According to the preparation method, surface modification with the conductive polymer is capable of improving the dispersion performance and the surface activity of graphene, loading graphene nanosheets with titanium oxidenanometer particles uniformly, and controlling the particle size of the nanometer particles; and in addition, construction of a oxide quantum dot-titanium oxide heterojunction is adopted to widen thespectrum response range and the photocatalytic activity of the catalysis material.

The invention relates to a composite bismuth ferrite photocatalyst and a preparation method and application thereof. The preparation method of Ag/FeTiO3/BiFeO3 comprises the following steps: adding FeTiO3 to deionized water; stirring to obtain suspension; adding AgNO3 to the suspension; stirring for 20-30 minutes under a light-proof condition; then stirring for 10-20 minutes with the irradiating of an ultraviolet light; adding BiFeO3; ultrasonically dispersing; centrifugally separating; washing the obtained precipitate through deionized water; drying; and then roasting for 20-40 minutes through a muffle furnace at the temperature of 400-450 DEG C to obtain the target product. According to the preparation method, the BiFeO3 material is composited; antibiotics can be degraded through efficient photocatalyzing under the visible light effect.

The invention relates to a preparation method of a supported visible-light response WO3/{001}TiO2 compound photocatalyst, which comprises three steps of (1) pretreatment of a supporter, (2) preparation of {001} crystal face exposure anatase TiO2 single crystals, and (3) preparation of the supported compound photocatalyst, the support supported catalyst with TiO2 as a center and coated with a WO3 core-shell structure is prepared, the characteristic that the tungsten trioxide (WO3) is taken as a narrow-gap (2.8eV) n-type semiconductor, and can be excited in a visible light range is fully utilized, the energy level difference between two semiconductor materials is utilized to effectively separate charges, the separating efficiency of a photon-generated carrier and the utilization rate of visible light are improved, the photocatalytic activity is high and unlikely to be lost, the catalytic activity is preserved for a long time, furthermore, the preparation process is simple, the reaction condition is mild, the reaction speed is easy to control, the cost is low, and the method is applicable to industrial promotion and application.

The invention discloses a foaming masterbatch with a photocatalytic function and a preparation method of the foaming masterbatch. The foaming masterbatch with the photocatalytic function is characterized by being prepared from 50-70 parts of a composite photocatalyst, 15-20 parts of carrier resin, 3-5 parts of a dispersing agent, 0.5-2 parts of a coupling agent, 1-2 parts of a lubricant and 1-20 parts of a foaming activator; inorganic powder is 100-5000 meshes in size and is one or a mixture of several of calcium carbonate, barium sulfate, kaoline, wet white carbon black, quartz powder, talcum powder, calcium silicate and mica; the method comprises the steps of taking polyolefin resin as a carrier, and adding the composite photocatalyst, the foaming activator, the dispersing agent, the coupling agent and the lubricant for extrusion and granulation. A photocatalytic material prepared from the masterbatch has the advantages that the material is high in catalytical efficiency and light in weight and can be recycled. The method is lower in cost, a preparation technology is simple, and industrialization can be achieved.

The invention relates to a fiber catalytic material for purifying formaldehyde gas and a preparation method thereof. The fiber catalytic material is in a non-woven fabric shape and is formed after reaction of polyacrylonitrile non-woven fabric modified by hydroxylamine hydrochloride and iron ions, wherein the content of the iron ions is 15-270mg/g. The preparation method comprises the following steps: carrying out modification treatment on the polyacrylonitrile non-woven fabric by adopting the hydroxylamine hydrochloride, then carrying out reaction on the modified polyacrylonitrile non-woven fabric and aqueous solution of ferric chloride, and enabling the iron ions to be loaded on the polyacrylonitrile non-woven fabric by coordination action, thus obtaining the fiber catalytic material for purifying toxic and harmful gases such as the formaldehyde gas. The fiber catalytic material is applicable to a fiber-based filtering material of a core part in an air purifying system; and compared with the traditional nano TiO2 catalyst, the fiber catalytic material has the advantages of strong visible-light absorption, low preparation cost and easy recycling and the like, so that the fiber catalytic material has a potential application value.

The invention discloses a preparation method and application of a magnesium titanate/graphite-phase carbon nitride composite visible light photocatalyst. The invention aims to solve the technical problem of non-ideal photocatalytic activity caused by relatively high recombination rate of existing g-C3N4 photo-induced electron holes. The preparation method comprises the following steps: synthesizing g-C3N4 with a relatively high specific surface area by adopting a pyrolysis method, then preparing magnesium titanate with a perovskite structure by adopting a hydrothermal method, and finally preparing the magnesium titanate/g-C3N4 composite visible light photocatalyst by adopting a ball milling method. According to the photocatalytic material disclosed by the invention, semiconductors with different band gap energy levels are compounded to form a heterostructure, so that the photocatalytic material has an excellent and adjustable photo-induced electron hole separation rate and a relativelywide spectral response range under visible light, and can be applied to visible light catalytic hydrogen production in the field of energy sources.

The invention discloses a nano TiO2-diatomite composite photocatalyst and a preparation method thereof. The nano TiO2-diatomite composite photocatalyst is prepared from the following raw materials: raw diatomite, titanium tetrachloride, ammonium sulfate and iron salt, wherein the mass ratio of the raw materials is that the ratio of the raw diatomite to the titanium tetrachloride is 100 to (80-200), and the ratio of the titanium tetrachloride to the ammonium sulfate to the iron salt is 100 to (17-66) to (0-0.7). With the adoption of the composite photocatalyst, the problems in the prior art that the visible light utilization rate of the composite photocatalyst is low and the degradation capability on organic pollutants is low are solved, the visible light utilization rate of the composite photocatalyst is improved, and the degradation capability on the organic pollutants is improved.

The invention discloses a magnetic Ce/N co-doped TiO2/diatomite composite material photocatalyst, which is based on a preparation process of N-doped composite powder, wherein cerium nitrate hexahydrate is selected as a Ce source, diatomite refined soil is adopted as a carrier, and NiFe2O4 nanoparticles with superparamagnetism are loaded on the surface of the catalyst by a sol-gel method. The doping modification of the rare earth element Ce is introduced into the TiO2, so that the visible light utilization rate of the TiO2/diatomite composite powder and the separation efficiency of photo-generated electron hole pairs are improved, and the composite material shows excellent photocatalytic performance; due to the introduction of the nickel ferrite, the catalyst has magnetism, so that the recovery capacity of the catalyst is improved, and the catalyst has a wide prospect in the application of treating hard-degradation organic pollutants contained in soil in a high-pollution area.

The invention belongs to the technical field of water treatment, and provides a photocatalytic separation film for water treatment and a preparation method. The method includes the steps that nano TiO2 and nano ZnO are generated in situ in the synthesis process of tertiary butyl thio[4]calixarene, then the nano TiO2 and the nano ZnO are compounded with graphene, a nano TiO2-nano ZnO-calixarene -graphene composite photocatalyst is prepared and further added into a polyether sulfone spinning solution, and the photocatalytic hollow fiber separation film is prepared through spinning. Compared witha traditional method, by means of the prepared photocatalytic separation film, the problem of film contamination in the film separation technology and the problem about nano powder recovery in the photocatalysis technology are solved at the same time, the utilization rate of visible light is high, the photocatalysis efficiency is high, and a catalyst can be evenly dispersed.

The invention provides a preparation method and application of a tungsten trioxide@molybdenum disulfide hollow tube composite catalyst, and relates to the preparation method and the application of a composite photocatalyst. The preparation method and the application aim at solving the problem that when the existing photocatalyst is applied to sewage purification, the visible light photocatalysis efficiency is low. The method comprises the steps that 1, rodlike WO3 is prepared; 2, after the rodlike WO3 is dispersed, sodium molybdate and thiourea are added; continuous stirring is performed; then, the mixture is transferred into a polytetrafluoroethylene inner liner; under the condition that the temperature is 160 to 200 DEG C, maintenance is performed for 2 to 24h; after the reaction is completed, natural cooling is performed to room temperature; washing is performed; drying is performed in a drying box; the tungsten trioxide@molybdenum disulfide hollow tube composite catalyst is obtained. The tungsten trioxide@molybdenum disulfide hollow tube composite catalyst is used for deeply purifying organic dye water bodies.

The invention provides a flaky CeO2/UIO-66-NH2 composite photocatalytic material and a preparation method thereof, and belongs to the technical field of photocatalyst preparation. The preparation method of the flaky CeO2/UIO-66-NH2 composite photocatalytic material comprises the following steps: S1, preparing a CeO2 nanosheet precursor through a water bath synthesis method, and then calcining the CeO2 nanosheet precursor to obtain a CeO2 nanosheet; s2, ultrasonically dispersing zirconium tetrachloride and 2-amino-1,4 phthalic acid in a solvent, then adding the CeO2 nanosheet into the solvent, uniformly mixing the solution, preserving heat for 12-48 hours at the temperature of 100-180 DEG C, and then separating and drying the solution to obtain the flaky CeO2/UIO-66-NH2 composite photocatalytic material. The flaky CeO2 and the UIO-66-NH2 are utilized to form a II-type heterojunction structure through surface-surface compounding, so that the separation efficiency of photo-induced electrons can be improved, and the photocatalytic activity of the composite material is favorably improved; meanwhile, the specific surface area of the composite material is increased, more active sites are favorably provided, and the photocatalytic performance is favorably improved.

The invention discloses a bismuth-based modified photocatalyst and a preparation method and an application of the bismuth-based modified photocatalyst. The preparation method comprises the following steps: (1) dissolving alpha-Bi2O3 in water, carrying out ultrasonic dispersion to form suspension liquid, adding solid KI for reaction, and carrying out magnetic stirring to obtain reaction liquid; (2) adding silver nitrate solid to the reaction liquid obtained in step (1), and carrying out magnetic stirring for reaction; after the reaction is completed, adding graphene oxide, and sequentially carrying out ultrasonic dispersion and stirring; and (3) adding N2H4.H2O to the solution obtained after stirring in step (2), carrying out water-bath reaction to obtain turbid liquid, carrying out washing and centrifugation on the obtained turbid liquid, taking precipitate, and grinding the precipitate after drying to obtain the bismuth-based modified photocatalyst. The prepared photocatalyst is used in the treatment of chromium-containing wastewater and generates reaction under the irradiation of visible light without adjusting the pH value. The preparation method of the photocatalyst disclosed by the invention is simple, the photo-induced electron and hole separation effect is good, the photocurrent is high, and the effect of treatment for the chromium-containing wastewater is good, secondary pollution is avoided.