179results about How to "Improve photocatalytic degradation efficiency" patented technology

The invention relates to a method for preparing Bi2WO6 optical catalyst which can respond visible light. Wherein, said method comprises that (1), preparing the forward body with Bi2WO6 structure at nanometer size that mixing the reactants or adding surface activator (P123, PVP, CTAB), mixing uniformly; (2), under 120-240Deg. C, reacting the forward body in water heating condition for 4-24h, eccentrically separating the product, washing and drying at 30-150Deg. C, to obtain the powder; then sintering the powder at 300-750Deg. C for 1-10h, to obtain the final catalyst. The invention has low cost, while the inventive catalyst high tens time degrade efficiency than TiO2 (P25).

The invention relates to a flower-like structured CuS material as well as a preparation method and application thereof. The preparation method comprises the following steps: mixing a cupric compound and a solvent, and sufficiently stirring the components at certain temperature so as to obtain a homogeneous solution; under acute stirring, slowly adding a sulfur-containing compound into the homogeneous solution, and performing temperature-keeping treatment; transferring the solution into a hydrothermal reaction kettle, and performing a sealed heating reaction at certain temperature, performing cooling till the room temperature, performing filtration and collection, washing the product, performing filtration again, performing vacuum drying, and grinding the product, thereby obtaining a black product, that is, the flower-like structured CuS material. The flower-like structured CuS material can be applied to photocatalytic degradation dye wastewater. Compared with the prior art, the flower-like structured CuS material is wide in visible light response range of CuS, and high in visible light utilization rate.

The invention relates to a multifunctional nano-composite sewage purification film and a preparation method and application thereof. The purification film comprises a substrate, a photo-thermal evaporation film and a catalytic degradation film, wherein the photo-thermal evaporation film is deposited on the substrate and has the photo-thermal conversion characteristic, and the catalytic degradation film is deposited on the photo-thermal evaporation film and has catalytic degradation performance. The substrate is a micro-nano film with a certain porous structure. The photo-thermal evaporation film is made from metal with the photo-thermal conversion characteristic or alloy of the metal or a micro-nano structure of non-metal inorganic matter. The catalytic degradation film is made from a nano photocatalyst material with the catalytic degradation performance. Compared with the prior art, the multifunctional nano-composite sewage purification film has photo-catalytic degradation and photo-thermal evaporation functions at the same time, diversified purification can be conducted on sewage, therefore, the overall conversion rate and utilization rate of sunlight are increased, and the sewage purification efficiency can be greatly improved.

The invention discloses a preparation method of a ZnO-doped TiO2 hollow sphere composite photocatalyst, comprising the following steps of: preparing Zn<2+> doped carbon / titanium dioxide nuclear-shell particles by adopting a template method and a hydrolytic cladding method, and then calcinating the nuclear-shell particles to obtain the ZnO-doped TiO2 nano hollow sphere composite photocatalyst. The photocatalyst can be used for catalyzing and degrading cationic dyes under ultraviolet or solar visible light. By utilizing low-cost titanium sources, zinc sources and carbon spheres for preparing the ZnO-doped TiO2 nano hollow sphere composite photocatalyst, the preparation method has the advantages of low cost of raw materials, simple process, short preparation period, less energy consumption and belongs to green synthetic technologies. After TiO2 hollow spheres are doped and compounded by utilizing ZnO, absorption spectrums generate red shift by utilizing the interface coupling effect of the TiO2 hollow spheres and the ZnO so that the spectral response range of the photocatalyst is broadened, and the utilization rate of solar energy is improved; and meanwhile, the method can also inhibit the compounding of photon-generated carriers and improve the activity of the photocatalyst by utilizing the high conductivity of ZnO particles.

The invention belongs to the technical field of photocatalysts for degrading organic sewage, and specifically relates to a method for preparing a carbon nitride / titanium dioxide heterojunction photocatalyst in one-step electrostatic spinning way. The heterojunction photocatalyst is prepared in the one-step electrostatic spinning way, wherein the one-step electrostatic spinning way specifically comprises the following steps: adding melamine or guanidine hydrochloride or urea to a mixed solution containing glacial acetic acid, tetrabutyl titanate, polyvinylpyrrolidone and an organic solvent; then performing the electrostatic spinning technology and the high-temperature sintering treatment to obtain the carbon nitride / titanium dioxide heterojunction photocatalyst. The prepared photocatalyst is outstanding in heterojunction and outstanding in performance of photocatalyzing degrading the organic sewage; the preparation technology of the carbon nitride / titanium dioxide heterojunction photocatalyst is simplified; the technology is simple; the time is saved. Therefore, the method has a good application prospect in organic sewage treatment.

The present invention discloses waste water treating microwave and light catalyzing method and apparatus. After grille depurating, still standing to deposit and pH regulation, the waste water to be further treated is microwave and light catalyzed in the waste water treating microwave and light catalyzing apparatus. The apparatus includes microwave reaction oven, waste water reaction chamber inside the microwave reaction oven, no-electrode lamp inserted inside the annular fixer on the inner wall of the waste water reaction chamber, and quartz stirrer set inside the waste water reaction chamber with shaft connected to the outer rotating motor. The present invention has prolonged service life of no-electrode lamp, raised photocatalytic degrading efficiency, simple apparatus, low power consumption and other advantages, and the combined microwave effect and photocatalytic oxidizing technology results in high organic matter eliminating rate.

The invention relates to a method for preparing a rubber powder-supported pavement automobile exhaust degrading composite, which is a method for compounding rubber powder, titanium oxide powder having a photocatalysis function and a coupling agent. Due to a characteristic of huge specific surface area, the rubber powder can be used to absorb and carry the titanium oxide powder to a maximum degree and fully absorb and collect automobile exhaust over pavements. Therefore, the method has the advantages that: the photocatalysis function of the titanium oxide is effectively protected and fully used and the efficiency of the pavement automobile exhaust degradation of the titanium oxide is improved; meanwhile, due to the high elasticity of the rubber powder and the action of the coupling agent, corresponding products have high wheel rolling resistance and rain washing resistance and the service life of the photocatalysis is prolonged. The composite can be used on surfaces of traffic facilities needing automobile exhaust degradation, such as asphalt concrete and cement concrete pavements, tunnels and culverts.

The invention relates to a preparation method of a photocatalytic material for an Ag loaded TiO2-ZnO inverse opal photonic crystal. Specifically, the method includes: taking poly(styrene-acrylamide) microsphere photonic crystal as a template, conducting filling with TiO2-ZnO composite sol, conducting ignition to remove the template, thus obtaining a TiO2-ZnO inverse opal photonic crystal; adsorbing AgNO3, and reducing Ag<+> into nano-Ag by ultraviolet irradiation so as to obtain the nano-Ag loaded TiO2-ZnO inverse opal photonic crystal; and representing the surface appearance and photonic band gap through a scanning electron microscope and a reflection spectrum. Under the irradiation of a metal halide light, the prepared photonic crystal shows good photocatalytic performance on photocatalytic degradation of Rhodamine B, which is decided by a high specific surface area of the inverse opal photonic crystal and the photocatalytic properties of noble metal nano-particles. The method provided by the invention is of important significance for preparation and development of novel photocatalytic materials.

The invention relates to a preparation method of a CuS / g-C3N4 nano-spheroidized compound catalyst. The preparation method comprises the following steps: (1) respectively weighing copper acetate, acetylacetone, sulphur chloride and g-C3N4, adding into a flask, adding with absolute ethanol, and carrying out ultrasonic stirring for 5-20 minutes; (2) respectively adding obtained acetylacetone-ethanol solution and sulfur chloride-ethanol solution into a copper acetate-ethanol solution, then adding a g-C3N4-ethanol solution into the mixed solution, and carrying out ultrasonic treatment; and (3) transferring the mixed solution into a polytetrafluoroethylene reaction kettle, heating in a drying oven, washing precipitates with alcohol, and drying, so as to obtain the CuS / g-C3N4 nano-spheroidized compound catalyst. Compared with the prior art, the preparation method has the advantages that the reaction is simple and rapid, the operation is easy, reaction conditions are mild, and the preparation method is applicable to industrial production; by taking visible light as a light source, the CuS / g-C3N4 nano-spheroidized compound catalyst prepared by virtue of the preparation method is applicable to the degradation of environmental organic pollutants.

The invention provides a photocatalytic composite particle as well as a preparation method and application thereof, the photocatalytic composite particle comprises strontium titanate, and an electron donor and an electron acceptor which are loaded on the surface of strontium titanate, and the photocatalytic composite particle is prepared by adopting an ultraviolet light induced deposition method. The invention further provides a photocatalytic membrane, the photocatalytic membrane comprises a substrate and a composite layer arranged on the surface of the substrate, the composite layer sequentially comprises a bottom layer and a repeating layer from the substrate, and the repeating layer comprises the photocatalytic composite particle layer. According to the invention, self-assembly layer by layer can be induced by UV, the photocatalytic membrane in which the number of prepared layers can be controlled and photocatalytic composite particles are uniformly arranged is prepared, the preparation method is simple, and the photocatalytic degradation efficiency is greatly improved.

The invention discloses a method for carrying out photocatalytic degradation on bisphenol A (BPA) in water, and a catalyst used in the method. The method comprises the following steps: fully mixing aBPA solution with O-g-C3N4, firstly absorbing in a dark environment, and then carrying out catalytic degradation for 3h or more under the condition of visible light so as to realize a degradation rateof 60% or more, wherein the O-g-C3N4 is obtained by means of high temperature-oxidation-high temperature combined treatment. According to the method, melamine which is low in price and each to obtainis taken as a raw material, and the O-g-C3N4 product with excellent performance can be prepared by means of the path of high temperature-oxidation-high temperature combined treatment; the whole preparation process is simple and quick in operation steps and easier to popularize. Compared with the product treated by means of single treatment such as single oxidation or single high-temperature calcination, the O-g-C3N4 prepared by means of the path of high temperature-oxidation-high temperature combined treatment has improved O2 doping effect, enlarged specific surface area and obviously expanded light absorption domain; after the method is adopted, the photocatalytic degradation efficiency of the BPA in the water within a visible light region reaches 62.3% and is 7 times higher than the degradation efficiency obtained by using the product treated by means of the single treatment; therefore, the method provided by the invention has very good practicality.

The invention discloses a nano-porous copper loaded ultrafine oxide copper nanowire composite material and a preparation method and application thereof. The material is a rod, and comprises an amorphous basal body, nano-porous copper covering the amorphous basal body, and ultrafine copper oxide nanowires loaded on the surface of the nano-porous copper; the amorphous basal body is CuxZryAlz alloy component, wherein x, y and z are atomic percents; x is not bigger than 50 and not smaller than 45, y is not bigger than 50 and not smaller than 45, z is not bigger than 10 and not smaller than 5; x+y+z is 100; the nano-porous copper has the layer thickness of 85-135 microns, the ligament width of 118-138 nm and the aperture size of 30-100 nm; the nanowires are 4-10 microns long and 5-15 nm wide; and every 20-30 nanowires are clustered as one bundle. The copper oxide nanowires are constructed on the nano-scale basal body for the first time. Nanowire copper oxide is tightly combined with the surface of the nano-porous copper metal, so that the prepared material achieves efficient photocatalytic degradation of organic dye.

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 photocatalyst, especially to a supermolecular pre-assembled carbon nitride nanotube photocatalyst and a preparation method thereof, belonging to the technical field of preparation methods for photocatalysis materials. The preparation method comprises the following steps: preparing a rod-like supermolecular intermediate with a structured morphology by using a low-temperature hydrothermal process; and carrying out calcining in a tubular furnace so as to obtain a chlorine-doped carbon nitride nanotube with a good morphology. The preparation method overcomes the problemsof low visible light utilization rate, low degradation efficiency of high-concentration organic dyes and the like of conventional photocatalysts in virtue of the characteristics of the tubular structure of the chlorine-doped carbon nitride nanotube and changes in an energy band structure caused by introduction of elemental chlorine.

The invention aims at providing a TiO2 nano particle / TiO2 nanotube array, which is prepared by the following methods of: firstly, carrying out pretreatment on a metal titanium silk, preparing the TiO2 nanotube array at the surface of the metal titanium silk by adopting an electrochemical anodic oxidation method; dipping the obtained TiO2 nanotube array in TiO2 nano-particle sol once; and finally burning at a high temperature, so as to obtain the TiO2 nano particle / TiO2 nanotube array. The TiO2 nano particle / TiO2 nanotube array disclosed by the invention can be used as a photoelectric catalyst to effectively degrade a methyl orange solution.

The invention provides a method for preparing composite photocatalyst In2O3 / CNB (g-C3N4). According to the method, used raw materials are derived from extensive sources, the preparation method is simple, the cost is low, the prepared composite photocatalyst-In2O3 / CNB has high photocatalytic efficiency and has the remarkable effect on photocatalytic degradation of wastewater, in particular dye wastewater.

The invention provides an air cleaning agent containing a catalytic agent, and relates to the technical field of environment-friendly material air cleaning. In order to solve the technical problems that an existing air cleaning agent containing a photocatalyst on the market has a single function and poor in weather fastness, cannot achieve purification or freshness for a long time, and is low in cleaning efficiency, the air cleaning agent containing the catalytic agent is prepared, the air cleaning agent adopts the catalytic agent as a main purification object, natural plant components and other auxiliaries are adopted, the air cleaning agent is prepared through the reasonable proportion, use is safe and convenient, the performance of the components are brought into full play and utilized,photocatalyst particles have the good weather fastness and can have the maximum purification effect in actual application, formaldehyde and other hazardous gas in air can be effectively removed, andthe deodorization, sterilization and anti-fouling performance can be achieved.

The present invention provides a photocatalytic concrete material sprayed with titanium dioxide / activated zeolite composite material and preparation method thereof, and the photocatalytic concrete material sprayed with titanium dioxide / activated zeolite composite material comprises following raw materials in parts by weight titanium dioxide 0.1-20 parts, activated zeolite molecular sieve 0.1-20 parts, dispersant 0.1-5 parts, emulsifier 0.05-2 parts, coupling agent 0.05-2 parts, cement 40-90 parts, fine sand 40-90 parts and water. In the present invention, the activated zeolite molecular sieve can load titanium dioxide photocatalytic material as a carrier, and can easily adsorb gaseous pollutant of automobile exhaust with huge specific surface area (280.1 m2 / g), thereby increasing photocatalytic degradation efficiency and the efficiency can reach 92%, besides, the present invention has advantages of simple preparation technology, cheap raw materials and low preparation cost, so the present invention is suitable for industrial production.

The invention relates to a preparation method and applications of an In2S3 / BiPO4 heterojunction photocatalyst, and belongs to the technical field of environment material preparation. According to thepreparation method, hydrothermal method is adopted, thioacetamide is taken as a sulfur source, sodium hydroxide is adopted to adjust pH value, synthesis of In2S3 nanometer particles (about 10nm) is carried out, simple water bath heating method is adopted so as to coat the surface of rod-shaped BiPO4 with In2S3, and prepare the In2S3 / BiPO4 heterojunction photocatalyst. The In2S3 / BiPO4 heterojunction photocatalyst is nontoxic, is stable, and is high in photocatalytic activity; construction of heterojunction is capable of improving separation of photo-induced electrons and photo-induced holes, and improving the photocatalytic activity of the photocatalyst.

The invention relates to a SnS2 / TiO2 photocatalyst filter screen and a preparation method thereof. The surface structure of a Ti wire mesh is provided with honeycomb TiO2 nano-sheets / nano-wires and SnS2 nano-particles. The specific preparation process includes the steps: (1) synthesizing titanium oxide nano-wires / nano-sheets by taking the titanium wire mesh as a substrate and taking NaOH solution containing PEG (polyethylene glycol) and urea; (2) growing SnS2 nano-particles on the titanium wire mesh with the titanium oxide nano-wires / nano-sheets growing on the surface by a double hydrothermal method and by taking SnC14 and Na2S EDTA (ethylene diamine tetraacetic acid) solution as hydrothermal agents. The prepared SnS2 / TiO2 photocatalyst filter screen has pollution degradation performance, recyclability and the like. After particles and other degradation products are adsorbed on the surface of the filter screen, photo-degradation performances can be restored after the filter screen is washed and activated by ultraviolet irradiation. The filter screen is simple in preparation process, structurally controllable and applicable to batch production.

The invention relates to a visible light catalyst for high-efficiently degrading organic dye waste water and a preparation method thereof, which belong to the technical field of environment and energy source. The preparation method is characterized by comprising the steps of mixing zinc ferrite and chitosan, cross-linking the mixture through glutaraldehyde so as to obtain a cross-linked chitosan / zinc ferrite compound, growing cuprous oxide on the surface of the cross-linked chitosan / zinc ferrite compound under the low-temperature hydrothermal condition so as to obtain the cuprous oxide / cross-linked chitosan / zinc ferrite triplet composite visible light catalyst. By adopting the novel triplet composite visible light catalyst, multiple coordination functionality of the chitosan, the zinc ferrite and the cuprous oxide can be played, the composite possibility of an electron and an electron hole can be effectively reduced, the apparent band-gap energy of the composite catalyst can be reduced, the spectrum range can be enlarged, the utilization rate of the visible light can be greatly improved, and the treatment effect of the waste water can be enhanced; the visible light catalyst is stable in performance, has no residue, has magnetism and is easily recycled; the waste water treatment process is simple, the cost can be greatly reduced, and the visible light catalyst and the preparation method thereof are an environment-friendly and high-efficient novel material and a novel method respectively.

The invention discloses a terephthalic acid uranyl coordination compound photocatalyst and a preparation method thereof, wherein the molecular formula of the photocatalyst is (H2-4,4'-bpy)[(UO2)2(TPA)3][4,4'-bpy=4,4'-bipyridine, TPA=terephthalic acid], the photocatalyst is yellow powder capable of being screened with a 100-mesh sieve and having a purity of not less than 99%, belongs to a tetragonal system, and has a p4<->21c space group structure, and the crystal cell parameters comprise that a is 23.203(3)angstrom, b is 23.203(3)angstrom, and c is 20.222(4)angstrom. According to the present invention, under the irradiation of an xenon lamp light source capable of simulating sunlight, with the photocatalyst, the RhB solution with the concentration of 20 mg / L can be degraded to 28.6% within 105 min; compared to the traditional TiO2, the photocatalyst of the present invention has the advantage of visible light response, and is the photocatalyst having good photocatalysis performance; and the preparation method has advantages of simple and easy-performing process, low requirements on equipment, and the like.

The invention provides an SnS2 nanosheet as well as a preparation method and an application thereof. The SnS2 nanosheet with both high adsorption and a high visible light catalysis degradation property is prepared with simple chemical liquid phase synthesis method. The preparation technology is simple and low in cost. The SnS2 nanosheet which can be applied to both adsorption and visible light degradation has the advantages of high adsorption, short adsorption equilibrium time, high visible light catalysis degradation efficiency, high degradation rate, environment-friendliness and the like.

The invention provides a preparation method for a silver modified phosphotungstic acid / titanium dioxide composite membrane catalyst and relates to the preparation method for a composite membrane catalyst. The invention aims to solve the problem of low sunlight use ratio of a TiO2 / H3PW12O40 composite membrane catalyst and the problem of secondary pollution to environment of a powdered composite membrane catalyst. The preparation method comprises the following steps: 1) preparing a mixed solution of titanium tetraisopropoxide and isopropyl alcohol; 2) preparing the mixed solution of dissolved H3PW12O40 and isopropyl alcohol; 3) mixing the two solutions; 4) preparing a sol after hydro-thermal treatment; and 5) spinning and ageing. The composite membrane catalyst prepared according to the invention can further promote the photocatalytic activity of TiO2 / H3PW12O40 composite membrane and widen the response range thereof; the problems that most present catalysts are powdered, are difficult to be recycled and are easy to bring secondary pollution to the environment are solved; the preparation method is suitable for the preparation of the silver modified phosphotungstic acid / titanium dioxide composite membrane catalyst.

The invention relates to a magnetization-enhanced and photocatalysis wind wheel and an air purification method; the wind wheel is characterized in that: at least two framework disks are arranged on a shaft sleeve which is sleeved outside a wheel axle, a plurality of frameworks radially and evenly distributed in the same number (not less than four) are arranged on each frame disk, a magnetization-enhanced catalysis unit is arranged between two corresponding frameworks on the adjacent framework disks, and a non-magnetically permeable fixed net is arranged at the periphery of each magnetization-enhanced catalysis unit. The air purification method adopting the magnetization-enhanced and photocatalysis wind wheel comprises the following steps: filtering, adsorbing and purifying the air pollutants from the pipeline airflow; transferring, collecting and further purifying the pollutants stuck on the magnetic permeable photocatalysis foamed metal. The magnetization-enhanced and photocatalysis wind wheel has the advantages of simple structure, small air resistance, and low operation costs; while in use, the electronic acceptors like H2O2 are not required to add into the water, and the wind wheel can still work stably and produce no secondary pollution.

The invention discloses a preparation method of nitrogen-doped carbon-cerium composite nanosheets, and solves the problem that in the prior art, common micro cerium dioxide particles do not have obvious effect on catalytic oxidation. The method comprises the following steps: taking cerium salt and a nitrogen-containing compound, adding deionized water and stirring at constant temperature, then adding an acid solution, and stirring at a constant temperature to obtain cerium salt slurry; reacting at a high temperature to obtain basic cerium carbonate slurry, and cooling, centrifuging, washing and drying to obtain a basic cerium carbonate precursor; then roasting to obtain cerium dioxide nanosheets; mixing the cerium dioxide nanosheet with an ethanol solution and the deionized water, then adding cyanamide and a surfactant, stirring at a constant temperature, reacting at a high temperature, cooling, and then centrifuging, washing and drying to obtain a nitrogen doped carbon-cerium composite nanosheet precursor; and then roasting at the atmosphere of inert gas to obtain the nitrogen-doped carbon-cerium composite nanosheets. The nitrogen-doped carbon-cerium composite nanosheets are lightin weight and high in photocatalytic activity.

The invention discloses a preparation method of an anti-pollution hollow PVDF (polyvinylidene fluoride) fiber membrane with an efficient heavy metal ion and organic dye removing function, and belongsto the field of high polymer materials. A product of the hollow fiber membrane is characterized in that heavy metal ions such as nickel, chromium, lead and the like in water can be adsorbed and removed, organic dyes such as bright blue, methylene blue and the like can be simultaneously adsorbed and removed, removal efficiency of the heavy metal ions and organic dyes in water is high, and the product has anti-pollution property to protein and microorganisms in water. According to the product of the hollow fiber membrane, the adsorption removal rate for low-concentration chromium ions reaches 90% or higher, and the methylene blue removal rate under the action of natural light reaches 90% or higher. Static protein adsorption tests show that adsorption of protein by the fiber membrane is reduced by 80% when compared with that by unmodified membranes. The product has the advantages that pressure resistance is good, a support body is not needed, the membrane area per unit volume and the fluxare large and the like; besides, special equipment is not required for preparation, industrial implementation is facilitated, and the cost is reduced.

The invention provides a rare earth doped spherical nano titanium dioxide preparation method. The method includes: (1) mixing organic titanate with alcohol to obtain alcoholic solution of organic titanate, wherein a volume of organic titanate is 5ml; (2) mixing deionized water, alcohols and acids to obtain mixed solution; (3) adding rare earth salts into the mixed solution obtained at the step (2), and well mixing; (4) under intense stirring, dropwise adding a product obtained at the step (3) into the alcoholic solution, obtained at the step (1), of organic titanate; (5) adding a final product obtained at the step (4) into a reactor, heating to 120-180 DEG C, and keeping the temperature for 6h; (6) subjecting a product obtained at the step (5) to centrifugal washing, and drying in a drying oven at 60 DEG C for 24h; (7) grinding a product obtained at the step (6), and calcining in a high-temperature furnace at a high temperature of 450 DEG C for 2h. The rare earth doped spherical nano titanium dioxide preparation method has the advantage that ano titanium dioxide preparation efficiency is improved.