76results about How to "Efficient photocatalytic activity" patented technology

The invention relates to a preparation method of a halogen bismuth oxide catalyst with photocatalytic activity. Aqueous solution of cationic surfactant and sodium halide NaX (X is Cl, Br or I) which are equivalent in amount of substance is mixed with aqueous solution of bismuth nitrate, the pH value is controlled to be 5-8, the mixture is heated for 16-18 hours for reaction at the temperature of 160-180 DEG C, and thus halogen bismuth oxide can be prepared. Compared with the traditional preparation method of the halogen bismuth oxide, the conditions are mild, the reaction process is simple, and the high-purity catalyst can be prepared via one-step reaction. In addition, the cationic surfactant cetyl sulfate pyridine with a stable pyridine ring is adopted, the preparation of the halogen bismuth oxide with a stable structure can be facilitated, the crystallinity, specific surface area and other structural characteristics of the halogen bismuth oxide can be improved, the photocatalytic activity of the halogen bismuth oxide can be greatly enhanced, and the halogen bismuth oxide has efficient catalytic activity for non-degradable macromolecular microcystin with a colorless heptapeptide ring.

The invention relates the method for preparation of pucherite composite photocatalyst loaded on cobalt oxide. The photocatalyst comprises semi-conductor pucherite particle and cobalt oxide particle. The pucherite is monoclinic crystal system scheelite structure, and the diameter is 100nm-5mum. The grain diameter of cobalt oxide is 10nm-1mum. The mass ratio of cobalt oxide and pucherite is 1-100mg/g. The specific surface area of composite photocatalyst is 0.5-5m2/g. The said photocatalyst can effectively degrade the noxious and harmful chemical under the ultraviolet light, visible light and natural light radiating. And the photocatalyst is easy to separate and recover.

This invention provides a method and a product for modulating and preparing optical catalyst of nm TiO2 taking TiCL4 as the raw material to realize inside dope of lattices and outside cover at the surface by secondary hydrolyzation, in which the catalyst prepared in this method is the acute Ti type or crystal-mixed type, the particle size is <=20nm, no hard agglomeration, scattering property is excellent and the light catalyzing efficiency is high radiated by ultraviolet light, visual light or glimmer.

The invention discloses a TiO2-reduced graphene composite and a preparation method thereof and application of the TiO2-reduced graphene composite to an artificial sea water system. The preparation method comprises the steps that 1, graphene oxide, absolute ethyl alcohol and deionized water are mixed and stirred in a water bath to form a balanced adsorption system; 2, a tetrabutyl titanate dissolved absolute ethyl alcohol solution is added dropwise to the adsorption system, and a reaction is carried out to obtain a TiO2-graphene oxide particle containing suspension system; 3, the obtained suspension system is transferred into an autoclave, and thermal treatment is carried out after closing; 4, heat treatment reaction liquid is separated after being cooled, and the composite is obtained after washing and drying. The method is simple in synthesis process, and the size of finished TiO2 anatase crystals obtained through the method ranges from 1 nm to 20 nm. Efficient light degradation can be carried out in the artificial sea water system to remove phenol, and the shape and performance of a photocatalyst can be effectively regulated and controlled by regulating reaction and thermal treatment parameters.

The invention relates to a bismuth oxyiodide/porous titanium dioxide compound photocatalyst as well as a preparation method and an application thereof and belongs to the field of photocatalysis. The technical scheme is as follows: bismuth nitrate is dispersed in ethylene glycol, potassium iodide is added, stirring is performed continuously, then porous titanium dioxide microspheres are added, ultrapure water is added, stirring is continuously performed at the room temperature for 1-3 h, an obtained product is washed and dried, and the bismuth oxyiodide/porous titanium dioxide compound photocatalyst is obtained. Porous titanium dioxide microspheres are synthesized with a simple hydrothermal method, and are large in specific surface area, uniform in size and beneficial to light scattering. The bismuth oxyiodide/porous titanium dioxide compound photocatalyst synthesized with the microspheres has the wider spectral response range, has efficient photocatalystic activity under visible light and has characteristics of wide application range and good stability, the technology is simple, operation is easy, and the cost is low.

The invention provides a preparation method of a acidic bismuth titanate photocatalyst with photocatalytic activity under sunlight. The invention adopts a chemical solution decomposition method (CSD), and uses bismuth nitrate and P25 as the main raw materials to prepare bismuth titanate (Bi4Ti3Oi2), which is then subjected to acid treatment to obtain the bismuth titanate photocatalyst with sunlight photocatalytic activity. The photocatalyst has excellent methyl orange (MO) degradation performance in the sunlight irradiation. The production process involved in the invention is simple and has cheap and easily available raw materials; the obtained powder has efficient light response degree, and widens the application range of bismuth titanate in photocatalysis field.

The invention relates to a heteropolyacid catalyst with visible light photocatalytic activity and a preparation method and uses thereof, which relates to the preparation method of chloride 2, 2'- a ruthenium bipyridine sensitization heteropolyacid, characterization and photocatalytic activity evaluation. The hybridized material is prepared by heteropolyacid H3PMo12O40 and the chloride 2, 2'- a ruthenium bipyridine through a chemical coprecipitaion method. The material is used for degrading methyl orange, methyl blue, rose bengal or the Congo red or the organic dyes which has the same chromophore as the aforementioned dyes. The hybridized material not only preserves the photocatalytic activity of heteropolyacid degraded organic materials, but also overcomes the shortcomings of polyacid of being easily dissoluble in polar solvents and difficult in processing organic dye waste water and difficult in recycling; the invention also overcomes the shortcoming that the hetaropolyacid can only reveal photocatalytic capacity under ultraviolet radiation generally; therefore, the invention has higher photocatalytic activity even in visible light region.

The invention discloses a method for preparing a nano layered g-C3N4/Ag@AgCl composite photocatalytic material. The method comprises the following steps: firstly, performing two-sectional urea heating thermal polymerization so as to prepare porous g-C3N4, performing thermal treatment with a solvent on the porous g-C3N4, performing ultrasonic peeling in water so as to obtain nano layered g-C3N4 colloid, preparing a hollow cubic Ag@AgCl nano material by taking ethanol as a solvent, sodium chloride as a template and silver nitrate as a silver source, and finally, performing ultrasonic compounding on the nano layered g-C3N4 and Ag@AgCl, thereby obtaining the nano layered g-C3N4/Ag@AgCl composite photocatalytic material. As nano layered g-C3N4 is distributed on the surface of Ag@AgCl to form a heterogeneous structure, the stability of the nano layered g-C3N4/Ag@AgCl composite photocatalytic material prepared by using the method can be effectively improved, light corrosion of Ag@AgCl is retarded, and the material is high in catalysis property under visible light and sunshine, and has very good application prospects in fields such as photocatalytic water pollution treatment.

The invention relates to a pure organic homogeneous phase deposition method for preparing nanometer oxide under normal temperature. In situ reaction is adopted by the method; the prepared nanometer oxide has the characteristics of simple preparation method, normal temperature compounding, small grain size, controllable structure, morphology and chemical constitution, low cost, batch production, and the like; the nanometer oxide can be further compounded into the oxides with efficient activity, such as, titanium oxide, silicon oxide, zirconium oxide, aluminum oxide and zinc oxide, under normal temperature. The method is characterized by comprising the following steps: taking alcohol solution as a solvent, amine solution as a buffering agent, metal salts, such as titanium, zinc, silicon, aluminum and zirconium, as metal sources and organic acid as a precipitator; dissolving the metal salts and the amine solution into the alcohol, thereby acquiring a solution A; preparing a solution B from the organic acid solution in the alcohol; mixing and stirring the solution A and the solution B, thereby causing the organic acid and alcohol uniformly distributed in the system to react with each other and generate water molecules; utilizing the water molecules to directly generate hydrolysis reaction with the metal salts uniformly distributed in the solution, thereby generating the high-activity nanometer oxidation material.

The invention discloses a method for treating exhaust gases by utilizing wet polyphase visible light catalytic oxidation. The method comprises the following steps: arranging a spray device on a visible light photocatalytic reactor with a supported BiOI catalyst, inletting a pollutive gasto the photocatalytic reactor with the supported BiOI catalyst from the bottom, and simultaneously starting the spray device to spray a liquid phase aqueous solution. The method can be used to remove and treat volatile organic gases and gas pollutants containing sulfur, oxynitrides, hydrogen sulfide, methyl mercaptan and the like, and the generation of secondary pollutants can be simultaneously prevented by adopting the method to treat the exhaust gases. The method has the advantages of simple process flow, simple preparation and repeatable utilization of the catalyst, low cost and simple operation.

The invention relates to a method for preparing a visible light responding spherical titanium dioxide composite photocatalyst with nickel oxide supported on the surface. As a photocatalytic material, TiO2 has incomparable performance advantages but has the following defects: TiO2 has narrower band gap, so that the light absorption range of TiO2 is only limited to the ultraviolet region; and recombination of holes and electrons affect the photocatalysis efficiency of semiconductors. The method comprises the following steps: mixing and stirring salt solution, tetrabutyl titanate and absolute ethyl alcohol to form titanium dioxide sol and carrying out standing, centrifuging, washing and vacuum drying to prepare spherical titanium dioxide particles; and then dispersing titanium dioxide microspheres in nickel salt solution and carrying out magnetic stirring, ultrasonic dispersion, vacuum drying and roasting to obtain the product. The method has the following advantages that the prepared photocatalyst has efficient photocatalytic activity, can degrade toxic and harmful substances in a photocatalytic manner, can completely degrade organic pollutants into water and carbon dioxide, can be applied to photocatalytic degradation reactions of various organics, has degradation rate close to 100% and has great industrial application value.

The invention relates to a polyoxometallate/resin hybrid material capable of realizing photocatalytic degradation of organic dyes, a preparation method for loading polyoxometallate to Merrifield resin, representation and photocatalytic activity evaluation. The hybrid material is formed by ethylenediamine covalence connection of polyoxometallate K7[BW11O39M(H2O)] (M=Mn, Co, Ni, Cu, Zn and Cd) and Merrifield resin. The material not only keeps photocatalytic activity of the polyoxometallate for the organic dyes, but also overcomes the shortcoming that the polyoxometallate is easily dissolved in polar solvents and cannot be recycled when treating wastewater containing the organic dyes, and has a wide application prospect in treatment for industrial dye wastewater.

The present invention discloses a weak visible light response compound photocatalyst and a preparation thereof and an application thereof. The preparation is as follows: (1) rare earth ion nitrate andtetrabutyl titanate are mixed and dissolved to form a compound reactant solution A; (2) graphene oxide, absolute ethyl alcohol and deionized water are mixed and dissolved to form an adsorption systemB; (3) in a water bath stirring, the compound reactant solution A is slowly added dropwise to the adsorption system B to obtain a suspension system; (4) the suspension system is transferred into a high-pressure autoclave; and a hot treatment is conducted at 160 DEG C-180 DEG C after sealing; and (5) the hot-treated reaction liquid is cooled; the cooled reaction liquid is separated; and washing and drying are conducted to obtain the catalyst. The radius of the rare earth metal ions is much larger than that of Ti4+ atoms; a small amount of the rare earth ions after doping are added and then dispersed in a lattice structure of TiO2, which promotes the transformation of the TiO2 crystal form from anatase to rutile; besides, a lattice distortion structure is formed to enable parameters of unitcells to change; and at the same time, the visible light response of the catalyst is promoted and photocatalytic activity under visible light is improved.

The invention discloses a high-activity phosphor-doped bismuth vanadate photocatalyst, a preparation method and applications thereof. The preparation method comprises the following steps: adding a mixture of a phosphor source and a vanadium source into a bismuth nitrate solution, wherein the mole number of the phosphor source is equal to the mole number of the vanadium source; stirring, then adjusting the pH of the system to a range of 1.5 to 7 so as to obtain a precursor; then transferring the precursor to a high-pressure reactor to carry out hydrothermal reactions, filtering and washing the reaction products after the reactions, and drying and grinding so as to obtain the high-activity phosphor-doped bismuth vanadate photocatalyst. The preparation method has the advantages of low cost and simple technology and is suitable for industrial production. The prepared high-activity phosphor-doped bismuth vanadate photocatalyst has a high-efficient photocatalytic activity under simulated sunlight and good application prospect in the fields of environment protection, solar energy conversion, catalysis, photoelectrical equipment, and the like.

The invention relates to a green and high-efficient method for purifying perfluorooctane sulfonate pollutants in water by photocatalysis in simulated sunlight. A vanadium-doped bismuth oxide photocatalyst with visible light absorbability is prepared firstly by hydrothermal synthesis technology. The photocatalyst has a large particle size, is convenient for separation from water so as to be recycled, and has high-efficient photocatalytic activity. The photocatalyst is added into simulated waste water containing perfluorooctane sulfonate, and a catalytic reaction takes place under a condition of simulated sunlight exposure; the degradation of the perfluorooctane sulfonate is realized, and the purpose of purifying perfluorooctane sulfonate-polluted water is achieved. The method has high cleaning efficiency, simple operations, and less process flows, can make use of solar energy directly, does not introduce or generate other harmful substances during the catalyst synthesis and the photocatalysis degradation processes, and can realize the green reduction of perfluorooctane sulfonate pollutants.

The invention relates to a method for preparing a visible light responding spherical titanium dioxide composite photocatalyst with ferric oxide supported on the surface. As a photocatalytic material, TiO2 has incomparable performance advantages but has the following defects: TiO2 has narrower band gap, so that the light absorption range of TiO2 is only limited to the ultraviolet region; and recombination of holes and electrons affects the photocatalysis efficiency of semiconductors. The method comprises the following steps: mixing and stirring salt solution, tetrabutyl titanate and absolute ethyl alcohol to form titanium dioxide sol and carrying out standing, centrifuging, washing and vacuum drying to prepare spherical titanium dioxide particles; and then dispersing titanium dioxide microspheres in ferric salt solution and carrying out magnetic stirring, ultrasonic dispersion, vacuum drying and roasting to obtain the product. The method has the following advantages: the prepared photocatalyst has efficient photocatalytic activity, can efficiently degrade toxic and harmful substances in a photocatalytic manner, can completely degrade organic pollutants into water and carbon dioxide, can be applied to photocatalytic degradation reactions of various organics, has degradation rate close to 100% and has great industrial application value.

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 provides a preparation method of a two-dimensional carbon nitride/two-dimensional titanium dioxide composite material. The two-dimensional carbon nitride/two-dimensional titanium dioxidecomposite material is formed by in-situ growing titanium dioxide nanosheets on surfaces of carbon nitride nanosheets. The preparation method has the advantages that the two-dimensional/two-dimensional heterojunction composite material is larger in specific surface area and larger in interface contact area, can provide a high-speed current carrier transfer passage, can improve the photon-generatedcarrier separation and transfer efficiency, and can provide more photocatalytic water-decomposition hydrogen-generation reaction active sites, and has outstanding photocatalytic activity. The preparation method of the invention is simple in preparation process, reaction conditions are easy to control, and the prepared two-dimensional carbon nitride/two-dimensional titanium dioxide composite material is a high-efficient and stable photocatalyst and is suitable for the mass preparation and industrialized production.

The invention discloses a magnetic fiber membrane supported photocatalyst for wastewater treatment and a preparation method thereof. The magnetic fiber membrane supported photocatalyst is obtained bythe following steps: a, preparing a magnetic fluid solution containing graphene and magnetic particles; b, preparing a polymer solution; c, mixing the magnetic fluid solution with the polymer solutionto form a spinning precursor solution; d, performing electrospinning to obtain a magnetic graphene polymer fiber membrane; e, adding cadmium acetate, thioglycolic acid and cadmium sulfide into waterfor a reaction, adding the fiber membrane, and continuing the reaction to obtain the magnetic graphene polymer fiber membrane supported cadmium sulfide quantum dot photocatalyst. The method has the benefits that the separation of photogenerated electrons and photoinduced holes is greatly enhanced by adding the magnetic graphene polymer fiber membrane, and the photocatalyst has high photocatalyticactivity, high adsorption capacity and high adsorption speed in wastewater treatment, is convenient to operate, low in cost, easy to separate and recycle and environmentally-friendly, and can be widely used in sewage treatment.

The invention belongs to the field of photocatalysis and particularly relates to AgI/BiVO4 heterojunction composite photocatalyst and preparation method and application thereof. The AgI/BiVO4 heterojunction composite photocatalyst is made from AgI and BiVO4, wherein a molar ratio of AgI and BiVO4 is 1:9 to 9:1. The AgI/BiVO4 heterojunction composite photocatalyst is prepared by hydrothermal process. The preparation method herein has simple process and is easy to control and low in cost, AgI/BiVO4 heterojunction structure responsive to visible light is constructed, separation of photo-induced carriers is accelerated, the chances of photo-induced carriers and hole pairs to recombine is reduced, the photocatalyst has efficient photocatalytic activity and stability in visible light, is efficient in killing harmful microorganisms and dye pollutants in water, and has high practical value and potential application prospect in the field of water purification and marine antifouling and other fields.

The invention discloses a defect type UiO-66 photocatalytic material, and a preparation method and application thereof, and belongs to the field of preparation of photocatalytic materials. According to the preparation method, when a zirconium-based metal framed material is prepared, a monocarboxylic acid crystal regulator is added for structural regulation and control, so that the defect type UiO-66 photocatalytic material is obtained. The preparation method comprises the following steps: uniformly mixing a precursor solution for preparing the zirconium-based metal framed material with a monocarboxylic acid crystal regulating agent, carrying out solvothermal reaction, and purifying and drying after the solvothermal reaction is finished, so as to obtain the defect type UiO-66 photocatalytic material. According to the preparation method disclosed by the invention, the photocatalytic performance of the traditional UiO-66 photocatalyst is effectively improved through a preparation process with a simple process. According to the prepared defect type UiO-66 photocatalytic material, the specific surface area and the pore diameter of the material are effectively increased, the migration efficiency of photo-induced electrons is effectively improved, and the photocatalytic performance is obviously improved compared with that of a single-crystal UiO-66 photocatalyst.