114results about How to "Improve photocatalytic activity" patented technology

The present invention provides a photocatalyst composite in which brittleness and ease of coming-off of a photocatalyst layer are reduced.

The photocatalyst composite includes a base material, at least the surface of which is formed of a plastic-deformable solid material; an inorganic particle layer containing inorganic particles disposed on the surface of the base material; and a photocatalyst layer containing a photocatalyst disposed on the surface of the inorganic particle layer; wherein at least one portion of voids in the inorganic particle layer is filled with the solid material, and the surface of the inorganic particle layer is coated with the solid material except for at least one portion.

The invention discloses a nano zinc ferrite-graphene composite photocatalyst of visible light response and a preparation method thereof. The composite photocatalyst is formed by compounding zinc ferrite and graphene in a mass ratio of 1:2-1:6. The preparation method comprises the following steps of: putting graphite oxide into ethanol to perform ultrasonic dispersion, adding ferric nitrate and zinc nitrate into the ethanol to perform dissolution with stirring, then mixing the two systems, transferring the mixed system to a hydrothermal kettle to perform reaction, and performing centrifugal separation, washing and drying on a product after the reaction is completed to obtain the nano zinc ferrite-graphene composite photocatalyst. The nano zinc ferrite-graphene composite photocatalyst with uniform granule size and uniform dispersion is prepared by using graphene as a supporting material and adopting a hydrothermal synthesis method. The prepared nano zinc ferrite-graphene composite photocatalyst has good application prospect and economic benefit on the aspect of sewage treatment.

A process for preparing the activated carbon carried TiO2 photocatalyst by organic chemical vapor deposition method includes treating activated carbon by nitric acid, using inertial gas to carry the hot Ti precursor into quartz reactor containing said activated carbon, depositing TiO2 onto surface of activated carbon, and calcining in inertial gas.

The present invention relates to a composite photocatalyst which can utilize sunlight and has good magnetic separating property and its preparation method. Said preparation method includes the following several steps: firstly, utilizing hydrothermal method to synthesize NiFeO4 nano granules, then utilizing homogeneous precipitation method to directly cover NiFeO4 magnetic nuclear surface by using TiO2 so as to form TiO2 external shell. Said composite photocatalyst can be used for making water supply treatment and waste water treatment.

The invention discloses a loaded photo-catalyst and a preparation method and use thereof. The photo-catalyst adopts the activated sludge carbon grains as the carrier; the carrier is wrapped with titanium dioxide; mass ratio of the carrier and the titanium dioxide is (3-4): 1; the preparation method comprises the steps of dissolving 1 volume of tetrabutyl titanate in 2-4 volumes of anhydrous alcohol; then steeping the activated sludge carbon grains in the mixed sol; uniformly stirring and putting aside and then filtering, drying the activated sludge carbon grains; calcining without oxygen; then cooling to obtain the loaded photo-catalyst. The photo-catalyst in the invention can effectively remove the heavy metal pollutant in sewage, and has the advantages of simple preparation, convenient use, environmental protection, economical and practical performance, good decontaminating effect and the like.

The invention relates to a tetrapod-like zinc oxide/graphene composite material and a preparation method thereof. The composite material is formed by growing a graphene nano sheet on the surface of tetrapod-like zinc oxide and belongs to the fields of novel micro-nano material and material preparation. The method comprises the following steps of step1, preparing reaction precursor liquor containing zinc nitrate or zinc acetate and oxidized graphene, wherein the pH value is 8 to 13; step 2, carrying out hydrothermal reaction of the precursor liquor prepared in step 1 at the temperature of 100 to 200 DEG C to prepare a reaction midbody; and step 3, calcining the midbody obtained in the step 2 in an environment of 200 to 680 DEG C while controlling the heating rate at 3 to 8 DEG C per minute to obtain the tetrapod-like zinc oxide/ graphene composite material. By adopting the tetrapod-like zinc oxide/graphene composite material and the preparation method thereof, the defect of existing tetrapod-like zinc oxide that the catalyzing efficiency is low and the clustering problem of the oxidized graphene in the reduction process can be solved. The tetrapod-like zinc oxide/graphene composite material is expected to be popularized in the fields such as heat conduction, piezoelectricity, voltage-sensitive, wave absorption, sound absorption, vibration absorption, antibiosis, anti-weeds, catalysis and the like.

The invention discloses a device and a method for treating high-salinity and degradation-resistant organic industrial waste water by performing photoelectrical synchro coupling and catalytic oxidation on three-dimensional particles. An anode rod compounded with a titanium-based coating, a stainless steel cathode rod and ultraviolet source condensers are arranged in a reaction device, compressed air is introduced, a nano semiconductor oxide surface coating ceramic medium serving as a carrier is in a suspension state, a hydroxyl radical is formed on an anode under the synchro coupling action of electrolytic oxidation desalination and photo-catalytic oxidation in the alkaline environment, Cl<-> in waste water is oxidized on the anode to generate Cl2, the Cl2 spreads into a solution for hydrolysis to generate ClO<->, and the ClO<-> can oxidize organic matters in the waste water and desalt the waste water; under the action of the ultraviolet source condensers, organic pollutants in the waste water are degraded; and by a side reaction, namely an oxygen evolution reaction during electrolysis, high-density dissolved oxygen is generated, and a hydroxyl radical .[OH] is generated by reacting the dissolved oxygen with nano semiconductor oxide photoinduced electrons, so that the activity of photo-catalytic oxidation reaction is enhanced, the mineralization and removal rates of degradation-resistant organic impurities in the waste water are increased, and the process is easy and convenient to operate.

The invention relates to a preparation method of a Bi/Bi4O5X2(X is equal to Br, I) complex photocatalyst of organic boron in oxidation fracturing fluid under a visible light. The preparation method comprises the steps of dissolving a compound containing 7.8mmol and 10.4mmol of bismuth elements into glycerol, and then dissolving 4mmol of compound containing iodine and bromine elements into the glycerol respectively; adding the solution containing the iodine and bromine elements into the solution containing the bismuth elements respectively, and carrying out stirring reaction for 60min; transferring the mixed solution into a reaction kettle, reacting at 160 DEG C for 16h, and cleaning and drying to obtain a precursor; weighing 0.3g of precursor, adding 50ml of distilled water, carrying out hydrolysis at the water bath temperature of 50 DEG C, and drying to obtain solid powder which is the Bi/Bi4O5X2(X is equal to Br, I) complex photocatalyst. The prepared catalyst has improved response to the visible light, especially has higher activity on removing the organic boron in the fracturing fluid, and can be applied to removing the organic boron in the fracturing fluid.

The invention relates to a method which is used for preparing a coating with high photocatalytic activity by adding the compound of nanometer titanium dioxide and silicon dioxide into the coating. The method comprises the following steps: after the combination, TiO2 sol and SiO2 sol gelate under the normal temperature through the sol-gel method; a nanometer compound substance with better photocatalytic activity is obtained through high temperature treatment; the prepared nanometer compound substance is added into the coating; through the dispersion of a milling machine and the dispersion of supersonic waves, the self-cleaning coating with high photocatalytic activity is prepared. The method has the technical proposal that nanometer photocatalytic materials are added into the coating formula; a unique dispersion technique is applied in the production process of the coating; the technique is widely applied to the aspects such as automotive coatings, interior and exterior wall coatings, hospital operating-table coatings, household appliance coatings, etc.

A preparation method of a photocatalytic photoconductive material is disclosed. A sol-gel method is adopted to prepare neodymium-doped nanometer TiO2 to enlarge the light response range of the neodymium-doped nanometer TiO2. The photoconductive material with photocatalytic performances is prepared by using high silica optical fibers as a carrier, and adopting a method combining vacuum dipping with sol-gel to coat modified nanometer TiO2 on surfaces of the high silica optical fibers. The immobilization of the nanometer TiO2 is realized, so problems of difficult separation and recovery, generation of secondary pollution and the like existing in the use process of a powdery photocatalyst are solved; the high silica fibers have high specific surface areas, so the amount for loading the nanometer TiO2 is substantially improved; and the photoconductive performances of the carrier material high silica fibers can furthest utilize the initiation capability of light to the catalyst, so the photocatalytic performances of the nanometer TiO2 are improved.

The preparation process of multifunctional honeycomb ceramic filter element includes the step of preparing honeycomb ceramic and the step of preparing nanometer photocatalytic desulfurizing film on the honeycomb ceramic. The honeycomb ceramic is prepared with industrial alumina powder, kaolin powder and talcum powder in the weight ratio of 14 to 43 to 43, and through mixing, squeezing, ageing, extruding to form the biscuit, drying and sintering in a high temperature furnace at 1390 deg.c for 4 hr. The honeycomb ceramic filter element is prepared through sol-gel process to prepare TiO2 sol and ZnFe2O4 sol, mixing into stable mixture sol, applying the mixture sol onto honeycomb ceramic, drying, calcining at 500 deg.c for 1 to form one film layer, repeating the applying-drying-calcining process for 3-6 times to prepare the honeycomb ceramic filter element with excellent functions of eliminating harmful gases and desulfurizing.

The invention provides a method for preparing visible light-induced high catalysis activity tin-doping nanometer titanium oxide photo-catalyst, belonging to the photo-catalyst material technique. It comprises following steps: first preparing tin-doping TiO2 sol; then, preparing tin-doping TiO2 film. The invention comprises the advantages that the prepared nanometer TiO2 film doping with Sn4+ has the duplex grain structure between anatase and red schorl; the average size of crystal grain ranges between 25-30nm, while the red schorl is formed by solid solving the Sn4+ into TiO2 crystal lattice; the surface of transparent film is smooth with a certain coarseness; the absorption band to incident light of TiO2 photo-catalyst film is removed to visible light band by doping Sn4+ to improve the visible light-induced photo-catalyst. The photo-catalyst activity is presented as the photo-catalyst degradation rate of helianthin and doping Sn4+ in right amount can effectively improve the photo-catalyst activity of TiO2 film, while compared with absolute nanometer TiO2 film, its photo-catalyst degradation rate of helianthin is improved more than 34%.

The invention discloses a preparation method of a BiVO4/2D g-C3N4Z type heterojunction photocatalyst. The method specially comprises the following steps: firstly preparing BiVO4 by a hydrothermal reaction method, performing thermal polymerization on melamine to prepare graphite-phase carbon nitride (g-C3N4), performing thermal oxidation stripping to obtain 2D g-C3N4, and preparing the BiVO4/2D g-C3N4Z heterojunction photocatalyst by using methanol as a solvent and adopting ultrasonic assisted chemisorption. According to the method provided by the invention, in the BiVO4/2D g-C3N4Z heterojunction photocatalyst prepared by the method, the 2D g-C3N4 is distributed on the surface of the BiVO4 to form a Z-type heterojunction structure, the catalyst can rapidly separate photo-generated electronsand holes, improve service life of photoelectrons and reduce a recombination rate of the photo-generated electrons and the holes, and has good response to visible light, and after a catalytic reaction is performed for 40 min, a degradation rate of a Rhodamine B solution can reach 93.0%; and the material can be used for photodegradation of organic pollutants, and has important significance for environmental management.

The invention provides a preparation method of nano titanium dioxide thin film materials loaded on the surface of a ceramic body. The preparation method comprises the following steps of: adding the organic titanium salt to the de-ionized water and stirring the de-ionized water and adding alkali liquor to adjust the pH value to be 6 to 8; centrifuging for separating the mixed solution, and adding the separated slurry to the mixed solution of absolute ethyl alcohol and acetylacetone; adding the dispersing agent to the mixed solution, sufficiently and uniformly stirring the mixed solution till the stable titanium dioxide sol is formed; soaking the high-temperature resistance and corrosion resistance ceramic body into the titanium dioxide sol, drying and forging the ceramic body for 2 to 4 hours to form one layer of nano titanium dioxide thin film material on the surface of the ceramic body. The thin film is distributed uniformly, and the thickness of the thin film is controllable. When being applied to treating the industrial waste water, the ceramic body loaded with nano titanium dioxide thin film can be utilized repeatedly and has low cost and no secondary pollution.

The antiseptic medical breathing mask is produced through mixing mixed crystalline titania below 50 nm, nano zinc oxide, dispersant, adhesive and water to form solution or emulsion; and painting the solution or emulsion to the outer layer of breathing mask. It has good ventilation, and bactericidal and bacteriostasis functions, and may be used by doctor, patient and other people.

A microbe reduced and noble metal modified TiO2 catalyst for catalytic degradation of phenol has a formula No-La/TiO2, where No is Ag and/or Pd. Its preparing process includes such steps as calcining TiO2, ultrasonic dispersing, adding it into the bottle containing microbe R08 and SH10, dark culture, impregnating in the solution of nitrate or chloride of noble metal, laying aside, washing, putting it in flowing N2, and carrying the nano-particles of noble metal by the í‹anchoríŒ and reducing action of microbes.

A titanium oxide photocatalyst that is capable of improving a decomposition rate, and a method for producing the same are provided. The titanium oxide photocatalyst of the present invention is a titanium oxide photocatalyst containing at least an anatase-type titanium oxide and fluorine, wherein a content of the fluorine is 2.5 wt % to 3.5 wt %, and 90 wt % or more of the fluorine is chemically bonded to the anatase-type titanium oxide.

The invention discloses a preparation method of a TiO2 nanowire photocatalyst modified by Au nanoparticles. The preparation method comprises the following steps: performing ethanol washing and acid washing on a titanium sheet respectively to remove surface greasy dirt and an oxidation layer, polishing the surface till the surface is uniform and smooth, performing oxidation treatment by an anodic oxidation method, performing anodic oxidation treatment by adopting a stepwise pressure-increasing method, and calcining in air after oxidation treatment; and modifying TiO2 nanowires with the Au nanoparticles by adopting an adsorption-photoreduction method, immersing the TiO2 nanowires into a chloroauric acid solution, illuminating by an ultraviolet lamp while stirring, washing with deionized water after treatment and drying. According to the preparation method disclosed by the invention, the photocatalytic activity is relatively high under irradiation of simulated sunlight, and the utilization of visible light is improved; furthermore, the preparation method is simple and the reaction is convenient to control; and as the immobilized photocatalyst, the separation from water is convenient, the new pollution is avoided, organic pollutants in a water body are removed, and the photocatalyst has good stability and reusability.

The invention relates to 100-200nm strontium titanate/titanium dioxide (rutile phase) composite nano fibers by means of a one-step electrostatic spinning method. The method is simple and high in operability. The obtained fibers are controllable in dimension, uniform in distribution and good in continuity. Compared with single TiO2 (rutile phase) and single SrTiO3, the photocatalytic activity of the prepared SrTiO3/TiO2 (rutile phase) composite nano fibers is hugely improved and the SrTiO3/TiO2 (rutile phase) composite nano fibers have an important application prospect in photocatalytic degradation of degradation-resistant organic pollutants such as methyl orange, methylene blue and rhodamine B.

The invention provides an iron and chrome co-doped nano titanium dioxide/zeolite compound photocatalyst and a preparation method thereof, and relates to sewage and waste gas treatment. The iron and chrome co-doped nano titanium dioxide/zeolite compound photocytalyst is characterized in that: nano TiO2 is doped with 0.5 to 2.5 weight percent of iron and chrome ions; the mass ratio of Fe3+ to Cr3+ is controlled to be 1:1-4; the Fe3+ and Cr3+ ions and Ti4+ ions with positive electricity are self-assembled on a zeolite substrate modified by negative electricity under the action of electrostatic attraction, the metal ions are combined together and then the zeolite substrate is baked to prepare the photocatalyst; and nano TiO2 crystals are mixed crystals of anatase crystals and rutile crystals. The iron and chrome co-doped nano titanium dioxide/zeolite compound photocatalyst has the advantages that: compared with the prior art, the compound material has the photocatalytic activity improved by over 40 percent, is filtered and dried for recycling, and then can still have relatively high photocatalytic activity; and the iron and chrome co-doped nano titanium dioxide/zeolite compound photocatalyst has the advantages of low cost, easy recycling, no pollution, great social and economic benefits, and good industrial application prospect.

The invention relates to the technical field of photo-catalysis and material chemistry, in particular to the preparation of Brookite-type nanoscale TiO2 photocatalyst. The preparation comprises the following steps: adding NaOH solution in Ti(SO4)2 solution dropwise to generate white sediment; stirring; standing; centrifuging multiple times until no SO4<2->; subjecting the precursor obtained by the above reaction to hydrothermal reaction in a high-pressure hydrothermal reaction kettle at 150 to 180 DEG C for 2 to 60 h; washing; and drying to obtain the product. The pure-phase Brookite-type TiO2 photocatalyst has good photocatalytic activity in visual light.

The invention discloses a supramolecular polymerized carbon nitride photocatalyst and a preparation method and an application thereof. The supramolecular polymerized carbon nitride photocatalyst is prepared from melamine, cyanuric acid, urea and dimethyl sulfoxide through a molecular polymerization reaction and calcination. The supramolecular polymerized carbon nitride photocatalyst has the advantages of high specific surface area, high photocatalytic activity and the like, can efficiently degrade organic wastewater and is a novel visible light catalyst. The preparation method has the advantages of simple synthetic method, low raw material cost, less energy consumption, short time consumption, easy control of conditions and the like, is suitable for continuous large-scale batch productionand facilitates the industrial use. the supramolecular polymerized carbon nitride photocatalyst of the invention can be used for degrading the organic wastewater, has the advantages of good degradation effect and good stability, and has good practical application prospects.

The invention relates to a TiO2 nanometer particle, in particular to a preparing method of a crystalline silver loaded TiO2 nanometer particle. The preparing method needs no additives such as absolute ethyl alcohol and acetoacetic acid ethyl, completes particle preparing directly in aqueous solutions, and is favorable for large-scale industrial production. The preparing method is characterized in that AgNO3 is dissolved in water, filled with titanium tetrabutoxide after being completely dissolved, moved into an autoclave, subjected to hydrothermal reaction, washed, leached and dried to obtain the black crystalline silver loaded TiO2 nanometer particle. The crystalline silver loaded TiO2 nanometer particle is obtained by preparing inorganic raw materials in aqueous solutions, and is low in cost and operation temperature, simple in device, free of pollution and favorable for enlarging industrial production.

The invention relates to a method for preparing a ZnO and CdO heterogeneous nano structural oxide material, and belongs to the technical field of inorganic material preparation. Dilute sulphuric acid and metal zinc powder are reacted to form loose and porous spongy metal zinc, then CdCO3 or Cd(OH)2 is evenly precipitated on the surface of the loose and porous spongy metal zinc, finally the metal zinc is oxidized to form ZnO, and the CdCO3 or the Cd(OH)2 is decomposed into CdO so as to form a ZnO/CdO heterogeneous nano structural oxide. The method is simple and convenient, and does not need a template agent; the size of oxide particles can be controlled by thermal treatment temperature or time; and the photocatalysis activity of a product is remarkably improved compared with the ZnO-CdO prepared by the prior coprecipitation method.

The invention relates to a method for synthesizing monoclinic phase mesoporous bismuth vanadate through a template method. The method comprises the following steps of: mixing nitric acid, ethanol and bismuth nitrate which are weighed in a mass ratio of 1:(2.8-28):(0.2-1) by ultrasonic wave, so as to obtain a bismuth nitrate solution; mixing nitric acid, ethanol and ammonium meta-vanadate which are weighed in a mass ratio of 1:(2.8-28):(0.05-0.25) by ultrasonic wave, so as to obtain an ammonium meta-vanadate solution; dropping the ammonium meta-vanadate solution slowly into the bismuth nitrate solution, so as to obtain a mixed solution; adding silicon dioxide aerogel microspheres to be used as a template, evacuating in order to fully inject the mixed solution in the template, reacting for 6 hours to 24hours at the temperature of 60 DEG C to 110 DEG C, so as to obtain solid products; and finally, heating the solid products to 160 DEG C to 400 DEG C in a tube furnace at the heating rate of 0.5 DEG C per minute to 10 DEG C per minute, roasting for 2 hours to 24 hours, naturally cooling to room temperature, and then removing the template by using a sodium hydroxide solution to obtain the monoclinic phase mesoporous bismuth vanadate with average aperture distribution (1nm to 20nm). The method provided by the invention is simple and easy to control in process and is environment-friendly; and the monoclinic phase mesoporous bismuth vanadate obtained by the method has excellent photo-catalytic performance within the range of visible light.

The invention relates to a preparation method of a nuclear-shell double-layer zinc oxide/cobalt tetroxide nanometer material and relates to a preparation method of the nanometer material and solves the problem of poor degradation of ZnO/Co3O4 prepared by the existing methods. The preparation method comprises the following steps: 1, dissolving zinc nitrate hexahydrate in methanol to form solution A, dissolving 2-methylimidazole in methanol to form solution B, mixing solution A and solution B, aging in an oven, washing and precipitating, and drying to obtain ZIF8 nanometer material; 2, dispersing that ZIF8 nanometer material in methanol to form solution C, dissolving cobalt chloride in methanol to form solution D, dissolving 2-methylimidazole in methanol to form solution E, and mixing the solutions C, D and E, aging in an oven to obtain a solid-liquid mixture, washing and precipitating and drying to obtain ZIF8@67 nanomaterial; 3, calcining ZIF8@67 nanometer material to obtain ZnO/Co3O4nanometer material. The invention is used in the field of nanometer materials.

The invention relates to a method for treating sewage by a photocatalysis method, in particular to a method using (CuAg)0.15In0.3Zn1.4S2 quaternary sulfide as a photocatalyst to purify tetracycline in water under the simulated sun light radiation condition, which aims at solving the problems of higher cost and lower removal rate in the existing water tetracycline removal method. The method comprises the following steps of 1, mixing and stirring a photocatalyst and to-be-treated tetracycline sewage; 2, magnetically stirring to reach adsorption balance; 3, using a xenon lamp to radiate the sewage; 4, recycling the photocatalyst. Proved by tetracycline photocatalysis degrading results, the method has the advantages that the tetracycline in the water can be purified at high efficiency; the energy consumption is low, the operation is simple, the purifying ability is high, the reaction condition is moderate, and the like; the flow process is short, the equipment is simple, the tetracycline purifying effect is good, and the broad industrial application prospect is realized.

The invention discloses an anti-bacterial glaze and a preparation method thereof. The glaze comprises the following raw materials in parts by mass: 40-50 parts of titanium dioxide, 0.5-0.8 part of zinc nitrate, 0.5-0.8 part of cerous nitrate, 3-5 parts of glacial acetic acid, 8-12 parts of distilled water, 30-40 parts of absolute ethyl alcohol, 0.2-0.3 part of a surfactant and 800-1200 parts of granite. The preparation method comprises the following steps: preparing an antibacterial agent, mixing for preparing glaze slip and sintering at a high temperature, so as to obtain the anti-bacterial glaze. According to the ceramic glaze with an anti-bacterial function, provided by the invention, by modifying titanium dioxide and doping titanium dioxide with related metal elements, a visible region of the titanium dioxide is enabled to have an antibacterial property; moreover, the ratio of all components is scientific and reasonable, a glaze surface is smooth, uniform color, good dispersity, high acid resistance and high alkali resistance are realized and the application range is wider.

Disclosed are a composite photocatalyst material with high activity in natural light and the preparation of the composite photocatalyst material, relating to environmental protection technology field. The invention is characterized in that the composite photocatalyst material is composed of polymer and inorganic substance, and can be obtained by the latex polymerization method; the polymer is polymerized by the common vinyl monomer; the inorganic substance can be used after being disposed with the coupling agent, the polymer combines with the inorganic substance by chemical bond; the separation of the inorganic substance and the polymer can be avoided when using the photocatalysis material. The invention method has wide raw material sources with simple preparation technology; no ultraviolet irradiation device needs to be provided additionally when the photocatalysis degrades the pollutants; the invention has high photo-catalytic activity just in natural light, thus the photo-catalytic efficiency is improved and the energy is effectively saved.

The invention discloses a whitening agent for a ceramic blank body. The whitening a gent comprises the following materials in parts by weight: 35-40 parts of titanium dioxide, 60-70 parts of aluminium hydroxide, 5-8 parts of kaolin, 12.5-15.5 parts of active micro silicon powder, 2-4 parts of zinc nitrate, 3-4 parts of barium carbonate, 2-4 parts of talc powder, 4-9 parts of aluminium oxide, 7-8 parts of disodium edetate dihydrate, 9-10 parts of sodium hexametaphosphate, 2-7 parts of nickel oxide, 4-7 parts of lithium borohydride and 1-6 parts of magnesium-calcium stone. The whitening agent disclosed by the invention has the advantage that the whitening effect and the antibacterial effect of ceramics are improved.