31results about How to "High photocatalytic degradation activity" patented technology

The invention relates to a nanometer composite, and particularly relates to a method for preparing a nanometer composite with a chrysanthemum structure. The method comprises the steps of adding titanium dioxide nanosheets into deionized water, carrying out ultrasonic dispersion, and obtaining a titanium dioxide dispersing liquid; under the condition of magnetic stirring, adding sodium molybdate and thioacetamide into the titanium dioxide dispersing liquid, and obtaining a mixed solution A; after finishing adding, stirring the mixed solution continuously, then transferring the mixed solution into a Teflon inner container, sealing the inner container in a stainless steel hydrothermal reaction kettle for hydrothermal reaction, after finishing the hydrothermal reaction, naturally cooling the reaction kettle to room temperature, centrifuging the obtained product, washing, vacuum drying and obtaining the composite. The method has the advantages that the source of raw materials is wide, and the method is simple and practicable and has low cost. The prepared titanium dioxide or molybdenum disulfide nanometer composite not only has good capacity in absorbing organic contaminants, but also has a good visible light photocatalytic degradation effect to organic contaminants.

The invention discloses a soft magnetic composite photocatalyst and a preparation method thereof, belonging to a sewage treatment technology and aiming to provide the soft magnetic composite photocatalyst easy to separate and recycle and the preparation method thereof. The technical scheme adopted by the invention comprises the following key point that granular active carbon is loaded with soft magnetic Mn0.5Zn0.5Fe2O4 and TiO2. The method for preparing the soft magnetic composite photocatalyst comprises the following steps of: (1) after manganese sulfate, zinc sulfate and green copperas are prepared into a mixed solution by ionized water, adding the granular active carbon into the mixed solution, uniformly stirring and reacting in a hydro-thermal reaction kettle, cooling, filtering, washing and drying a reaction product to obtain soft magnetic active carbon; and (2) preparing tetrabutyl titanate, absolute ethyl alcohol, nitric acid and water into a titanic acid solution, impregnating the soft magnetic active carbon into the titanic acid solution, carrying out stirring, standing, pumping filtration and drying on the impregnated soft magnetic active carbon, then calcining the obtained product in a muffle furnace in an inert atmosphere, and cooling the calcined product to the room temperature to form the soft magnetic composite photocatalyst. The soft magnetic composite photocatalyst is used for organic wastewater treatment.

The invention relates to a preparation method of cerium-doped NH2-UiO-66/indium zinc sulfide composite visible-light-induced photocatalysts. The preparation method comprises the following steps: preparing cerium-doped NH2-UiO-66 by adopting a solvothermal method, then carrying out a hydrothermal reaction by using an in-situ growth method to separately obtain a cerium (IV)-doped NH2-UiO-66/indium zinc sulfide composite visible-light-induced photocatalyst and a cerium (III)-doped NH2-UiO-66/indium zinc sulfide composite visible-light-induced photocatalyst. The preparation method has the beneficial effects that cost is low, repeatability is high, and the preparation conditions are mild and controllable. The prepared cerium-doped NH2-UiO-66/indium zinc sulfide composite visible-light-induced photocatalysts are green environment-friendly photocatalysts, and the cerium-doped NH2-UiO-66 is compounded with indium zinc sulfide, so that photocatalytic degradation activity can be effectively improved, and therefore, the preparation method has a certain application prospect in the field of water pollution treatment.

The invention provides a nano titanium dioxide photocatalyst with double-particle size distribution and a preparation method thereof. The method includes: dissolving an organic titanate in an alcohol solution, adding an aqueous solution of polyacrylic acid and polyvinylpyrrolidone dropwise under stirring to prepare a transparent titanium dioxide sol; then adding a commodity nano titanium dioxide powder and carrying out ultrasonic stirring to obtain titanium dioxide colloids from transparent to translucent; and finally conducting spray drying, thus obtaining the nano titanium dioxide photocatalyst with double-particle size distribution. The titanium dioxide photocatalyst prepared by the method provided by the invention has no need for adding any surfactant or dispersant during use, by water adding and stirring, a high-stability nano titanium dioxide photocatalyst spray solution can be prepared, and can be placed stably for more than 6 months. The catalyst provided by the invention has high activity on photocatalytic degradation of organic matters under sunlight, and the degradation rate is 40% higher than that the existing commodity nano titanium dioxide P25.

The invention relates to the technical field of catalytic materials, and concretely relates to a carbon-doped titanium dioxide photocatalyst, and a preparation method and an application thereof. A titanium-based metal organic framework is prepared from an organic ligand and a titanium source, and the titanium-based metal organic framework is used as a template to prepare the carbon-doped titaniumdioxide photocatalyst with a porous structure and a high specific surface area. According to the photocatalyst, the contact area with pollutants can be increased, photo-generated charges can be rapidly transferred to the surface of the photocatalyst, electron-hole separation is promoted, meanwhile, the band gap of TiO2 can be reduced through doping of the carbon element, and the absorption range of visible light in sunlight is widened, so the photocatalytic degradation activity is improved.

The invention relates to a preparation method of a Bi-Bi3NbO7 composite photocatalyst and the Bi-Bi3NbO7 composite photocatalyst. The preparation method comprises the following steps: S01, weighing bismuth nitrate pentahydrate and niobium oxalate, and dissolving the bismuth nitrate pentahydrate and the niobium oxalate into glacial acetic acid and methanol, thus obtaining a first mixed solution; S02, adding phenylcarbinol in the first mixed solution, thus obtaining a second mixed solution; S03, adding a potassium hydroxide solution in the second mixed solution, and carrying out hydrothermal reaction; S04, washing and drying precipitate, thus obtaining Bi3NbO7 nanosheets; S05, dispersing the Bi3NbO7 nanosheets in an ethylene glycol solution, and adding a bismuth source, thus obtaining a third mixed solution; S06, carrying out the hydrothermal reaction on the third mixed solution; S07, washing and drying precipitate, thus obtaining Bi-Bi3NbO7. The preparation method disclosed by the invention has the beneficial effect that through a preparation technology that dipping-hydrothermal reduction and secondary hydrothermal reduction are combined, a high-activity photocatalyst is prepared.

The invention discloses a photocatalyst (Cu, Pd)-NiGa2O4/BiVO4 with double promoter and an application thereof. The photocatalyst is prepared by utilizing illumination assisting and a chemical reduction deposition method according to the following steps: dispersing (Cu, Pd)-NiGa2O4 and BiVO4 into an ethanol solution; centrifuging after ultrasonically dispersing for 5.0min; drying the acquired sediment, grinding and transferring into a muffle furnace; thermally treating for 2.0h while keeping temperature at 500 DEG C, thereby acquiring a Z type photocatalyst (Cu, Pd)-NiGa2O4/BiVO4 compound. Inthe invention, Cu and Pd are capable of providing more active sites as well as accelerating electron transfer. The compounded (Cu, Pd)-NiGa2O4/BiVO4 photocatalyst applied to degradation of wastewatercontaining N organic dyestuffs has an ultra-high photocatalytic degradation activity.

The invention relates to the technical field of photocatalytic degradation materials, and discloses a molybdenum disulfide-loaded cobalt-doped zinc oxide photocatalytic degradation material. The morphology of zinc oxide is controlled in the process of synthesizing cobalt-doped flower-like nano zinc oxide by a hydrothermal method to generate nano flower-like zinc oxide, divalent cobalt is doped toreplace divalent zinc in zinc oxide, band-gap energy red shift is generated, the visible light absorption capacity of zinc oxide is improved, the molybdenum disulfide-loaded cobalt-doped zinc oxide photocatalytic degradation material is synthesized through a thermal flux method, the zinc oxide and the molybdenum disulfide are matched in energy band, a heterojunction structure can be formed, the electrons of zinc oxide and molybdenum disulfide are excited under optical radiation and transit from a valence band to a conduction band to form carriers, recombination of photo-induced electrons and holes is inhibited, meanwhile, the photo-induced electrons are gathered on the conduction band of zinc oxide and form superoxide radicals after adsorbing oxygen, the superoxide radicals can react withwater to generate hydroxyl radicals, and organic matters can be degraded at high efficiency.

The invention discloses a photocatalyst as well as a preparation method and application thereof, and belongs to the technical field of photocatalysis. The preparation method comprises the following steps: dipping and depositing NH2-MIL-125 (Ti) in a cobalt ion solution, and burning to obtain the sponge three-dimensional CoTiO3/C-TiO2 II type heterojunction photocatalyst. The three-dimensional CoTiO3/C-TiO2 II type heterojunction photocatalyst not only has a very large specific surface area and can provide more reaction active sites for catalytic reaction, but also introduces a carbon source toenhance the light absorption. The photo-generated charge transfer type of CoTiO3/TiO2 is changed from I type to II type, the compounding of photo-generated charges is effectively inhibited, and the photocatalytic degradation activity of titanium dioxide is greatly improved. The preparation method of the photocatalyst is simple, the obtained photocatalyst is novel in structure, efficient photocatalytic activity and good stability for antibiotic degradation are shown under the action of visible light, and the actual application prospect of the titanium dioxide photocatalyst is greatly improved.

The invention relates to a preparation method for nitrogen and carbon co-doped nanometer titanium dioxide visible-light photocatalyst. The preparation method comprises the steps of: taking and adding glacial acetic acid into a container, adding anhydrous ethanol solution of tetrabutyl titanate while agitating to prepare precursor solution, adding the precursor solution into a reaction device, keeping temperature to be 0-20 DEG C, adding ammonium carbonate super-saturated solution while agitating, forming gel after a great amount of white sediment appears, aging and drying to obtain titanium dioxide gel; and heating the titanium dioxide gel at program-controlled temperature in an atmosphere of flowing air, roasting for 1-3h at low temperature and cooling to room temperature to obtain the nitrogen and carbon co-doped nanometer titanium dioxide visible-light photocatalyst. Since conventional equipment and common raw materials are used in the method, the cost is low, the preparation process is simple and the large-scale industrialized production is easy to realize. The prepared photocatalyst particles are even, the grain size is small, the specific surface area is large, the photocatalyst shows high-efficiency photocatalyst degradation activity under the irradiation of visible light, and the degradation rate of rhodamine B within 90min reaches more than 91 percent.