33results about How to "Visible light response ability is strong" patented technology

The invention discloses an organic solvent-water heating method for preparing football-shaped mesoporous BiVO4, comprising the following experimental steps: under the condition of stirring, bismuth nitrate and ammonium metavanadate are dissolved in a mixed solution of ethanol, ethylene glycol, nitric acid and laurylamine (oleylamine or mixed liquid of oleylamine and oleic acid); a sodium hydroxide (2mol / L) alcohol solution of ethanol and ethylene glycol with the volume ratio of 1 to 1 is used to regulate the pH of the solution to be equal to 1.5-3; the mixed solution is transferred in a stainless steel self-pressing vessel (the volume filling degree is about 70%) with a Teflon inner liner and is put in an incubator to carry out organic solvent - water heating treatment for 12h in constant temperature of 100 DEG C; and the mixed solution is naturally cooled to room temperature after taking out. The obtained product after the organic solvent - water heating treatment is filtered, is washed with deionized water and absolute ethanol and is dried for 12h at the temperature of 60 DEG C, and then football-shaped mesoporous BiVO4 micron particles with a monoclinic scheelite structure is obtained. The porous bismuth vanadate obtained by the method has good application prospects in the fields of photocatalysis, electrode materials, pigments, ion conductive ceramic, and the like.

The invention discloses a preparation method and application of a novel visible light response compound photocatalyst for growth of ZnIn2S4 on the surfaces of TiO2 hollow spheres. The method can be applied to treatment of water body pollution. The method includes the following steps of ultrasonically dispersing the obtained TiO2 hollow spheres in water, and then preparing a ZnIn2S4/TiO2 nanometer compound hollow sphere photocatalyst through an in-situ hydrothermal method. The prepared ZnIn2S4/TiO2 nanometer compound hollow sphere photocatalyst can be used for catalyzing and degrading tetracycline hydrochloride, levofloxacin and methyl orange under visible light. The obtained ZnIn2S4/TiO2 nanometer compound hollow sphere photocatalyst can capture more visible light and has a matched band gap structure, photoelectron and hole separation efficiency can be improved, good interface contact promotes photoelectron transmission, and the visible light catalytic activity of the catalyst is remarkably improved.

The invention provides a graphene nitrogen carbide quantum dot modified ZnS micrometer composite material as well as a preparation method and application thereof and belongs to the technical field ofsemiconductor composites. The method comprises the following steps: preparing ZnS(en)0.5 nanosheets; adding amino compounds into a porcelain boat, and raising the temperature and reacting in a tube furnace so as to obtain bulk phase g-C3N4 powder; finally, mixing and stirring the ZnS(en)0.5 nanosheets and the g-C3N4 powder, and carrying out a hydrothermal reaction in a reactor, thereby obtaining the graphene nitrogen carbide quantum dot modified ZnS micrometer composite material. The invention further provides application of the graphene nitrogen carbide quantum dot modified ZnS micrometer composite material serving as a photocatalyst. The photocatalyst can reach hydrogen production activity of 5600u mol h-1g-1 under visible light and has excellent photocatalytic stability, the hydrogen production activity is 140 times that of the ZnS under the same condition, and after four cycles, the catalytic effect is not obviously decreased.

The invention discloses a preparation method of a phosphorus-doped cadmium sulfide supported nickel carbide quantum-dot nanorod photocatalyst. The preparation method includes the steps of 1) mixing CdS nanorods and NaH2PO2, heating the mixture in N2 atmosphere to obtain phosphorus-doped CdS nanorods; 2) dissolving the phosphorus-doped CdS nanorods in N,N-dimethylformamide, adding Ni(NO3)2 6H2O and2-methylimidazole, and stirring at room temperature to obtain a precursor material; 3) heating the precursor material of the step 2), holding the temperature, cooling to room temperature, washing with deionized water and ethanol to obtain a black-green product, and drying the black-green product to obtain the phosphorus-doped cadmium sulfide supported nickel carbide quantum-dot nanorod photocatalyst. The photocatalyst prepared via the preparation method has good stability and high visible light catalytic activity, and the preparation method is simple.

The invention discloses a BiOCOOH/g-C3N4 composite photocatalyst and a preparation method and application thereof and relates to the technical field of photocatalysis. In the BiOCOOH/g-C3N4 compositephotocatalyst, the BiOCOOH is inlaid in the lamellar structure of the g-C3N4; and the molar ratio of the BiOCOOH to the g-C3N4 is (0.15-4.75):1. The composite photocatalyst has stronger visible lightresponse capability, higher photo-induced electron-hole pair separation efficiency, high catalytic activity and high efficiency of visible light catalytic degradation of organic dye-containing wastewater. The preparation method comprises the following steps of synthesizing the composite photocatalyst from the g-C3N4, soluble bismuth salt and a solvent through a hydrothermal method, wherein the molar ratio of the soluble bismuth salt to the g-C3N4 is (0.15-4.75):1. The preparation method has the advantages that the raw materials are cheap and easy to obtain, the process is simple, the operationis simple and convenient, and secondary pollution is avoided.

The invention provides a preparation method of vanadium-doped strontium titanate photocatalytic nanomaterial. The method is based on the principle of hydrothermal synthesis of a compound, a titanium source and a strontium source which are needed for synthesizing strontium titanate are mixed with a vanadium source needed for doping, the mixture is then subjected to a reaction for hours at a high temperature, and vanadium-doped strontium titanate is generated finally by growth. The method has the characteristics that less raw material types are needed, the operation method is simple and environmentally friendly, the process is simple, the cost is low and the like, and the prepared vanadium-doped strontium titanate photocatalytic nanomaterial has great significance in researching the photoresponse photocatalytic mechanism of the material and preparing other perovskite photocatalytic materials.

The invention discloses a synthetic method and application of photocatalyst Bi5O7Br, belongs to the technical field of nano materials, and can solve the problem that current preparation of a Bi5O7Br catalyst requires conditions such as high temperature, high pressure, long-term reaction and an organic solvent for dissolution. The Bi5O7Br photocatalyst with a narrower band gap, stronger visible light response capability and single composition is obtained by using bismuth nitrate pentahydrate and sodium bromate as raw materials and ammonia water as a pH adjusting agent through a simple economical environmentally-friendly normal-temperature hydrolysis process. According to the method provided by the invention, the raw materials used in the method are cheap and easy to obtain, no organic solvent is used, and the method is simple, easy to implement, economical and environmentally friendly, does not produce toxic or harmful by-products, uses normal-temperature normal-pressure conditions, issimple and safe, and easily realizes industrial production.

The invention relates to a photocatalytic material with visible light response capability and a core-shell structure, and a preparation method. The material takes a rodlike single crystal of ZnO as a core, and is coated with a V2O5 polycrystal shell layer. The preparation method of the photocatalytic material comprises the following steps: by adopting a thermal evaporation method, synthesizing a single-crystal rodlike ZnO nanomaterial by taking ZnO powder and graphite powder as raw materials; by adopting a chemical vapor deposition method, depositing a V2O5 precursor on the surface of the rodlike ZnO nanomaterial by taking vanadiumoxy acetylacetonate [VO(acac)2] as a raw material under the nitrogen protection; finally performing thermal oxidization on the coated material to form a the photocatalytic material with a V2O5@ZnO core-shell structure. The core-shell photocatalytic material is controllable in morphology, strong in repeatability, stable in structure, good in photocatalysis effect, and the method is simple in technology, and suitable for large-scale industrial product, and has excellent application prospects.

The invention discloses a preparation method and application for a bismuth titanate nanosheet, and belongs to the field of nano material preparation and photocatalysis application. The method comprises the following steps: using bismuth nitrate pentahydrate (Bi(NO3)3.H2O) and TiO2(P25) as raw materials, and respectively using glacial acetic acid and deionized water as a positive solvent and a negative solvent, carrying out steps of mixing and stirring, filtering, washing, calcining and the like, preparing a nanosheet-like bismuth titanate photocatalyst, wherein the nanosheet-like bismuth titanate photocatalyst has the excellent photocatalytic performance to rhodamine B (RhB) under visible light. The method is simple without involving strong acid, strong base and the like, gentle in reaction condition, and suitable for large-scale industrial production. In addition, the prepared catalyst is small and uniform in granularity, high-efficient and non-toxic, and has an extensive applicationprospect in the water treatment field.

The invention discloses a microbial fuel cell with a photocatalytic material loaded on a positive electrode and a preparation method and application of the microbial fuel cell, and belongs to the technical field of environment water pollution treatment and energy recovery. The photocatalytic material is loaded on the positive electrode of the microbial fuel cell, a negative electrode is an air electrode; and a resistor is connected between the positive electrode and the negative electrode. The preparation method comprises the following steps: dissolving the photocatalytic material, coating onthe surface of a carbon electrode, heating to obtain the carbon electrode loaded with the photocatalytic material, taking the carbon electrode as the positive electrode and the air electrode as the negative electrode, connecting the resistor between the positive electrode and the negative electrode; connecting the positive electrode, the negative electrode and the resistor in series, putting in areactor, and forming the microbial fuel cell with the photocatalytic material loaded on the positive electrode. The microbial fuel cell with the photocatalytic material loaded on the positive electrode can rapidly thoroughly degrade the organic matters like chlorophenols, and the electricity generation performance of the fuel cell is improved.

The invention relates to the technical field of water treatment, and in particular relates to a black titanium dioxide/silver phosphate composite photocatalyst as well as a preparation method and application thereof. The black titanium dioxide/silver phosphate composite photocatalyst provided by the invention comprises black titanium dioxide and silver phosphate dispersed on the surface of the black titanium dioxide. According to the method, the black titanium dioxide is compounded with the silver phosphate, so that the problem of low photocatalytic efficiency of the black titanium dioxide isovercome, and the stability in the application process of the silver phosphate is greatly improved by accelerating electron transfer; and the composite photocatalyst can efficiently and stably removesingle and combined contamination of typical harmful algae and/or antibiotics in water.

The invention belongs to the technical field of nano-enzyme catalytic antibiosis, and particularly relates to a method for preparing cerium oxide nano-enzyme based on laser liquid phase irradiation and application. The preparation method comprises the following steps: (1) dispersing silver nanoparticles and cerium oxide nanoparticles in a liquid phase solvent to obtain a colloidal suspension; and (2) irradiating the suspension by using a laser beam to weld the silver nanoparticles and the cerium oxide nanoparticles into composite nanoparticles, and carrying out centrifugal separation, cleaning and drying to obtain the cerium oxide nano-enzyme. Silver nanoparticles are loaded on cerium oxide nanoparticles to prepare the silver-cerium oxide nano composite material, so that the visible light response capability of the cerium oxide nanoparticles is improved, the silver nanoparticles are introduced as a new active center, the catalytic activity of the cerium oxide nanoparticles is enhanced, and the silver-cerium oxide nano composite material is applied to the antibacterial field and has good application prospects. The antibacterial rate reaches up to 80% or above, and the antibacterial effect is extremely high.