53results about How to "Good visible light response performance" patented technology

The invention discloses a p-n-type Bi2O3/BiPO4 heterostructure visible light-response photocatalytic film material and a preparation method thereof. The preparation method comprises the following steps of dissolving a glycol solution containing Bi<3+> and PO4<3-> into water, carrying out precipitation, washing, drying, constant-temperature calcinations and grinding to obtain white BiPO4 powder, dissolving KI and the white BiPO4 powder into acetone to obtain an electrolyte solution, carrying out electrophoretic deposition on a conductive substrate in the electrolyte solution to obtain a precursor BiPO4 film, dissolving KI, Bi(NO3)3 and p-benzoquinone into water, adjusting a pH value to obtain a Bi2O3 electrodeposition solution, carrying out electrodeposition on the precursor BiPO4 film, a platinum sheet, an Ag/AgCl electrode and the Bi2O3 electrodeposition solution, carrying out dry and carrying out calcination. The composite photocatalyst has high photocatalytic activity and stability and has good electrocatalysis degradation effects.

The invention discloses a carbon nitride nano particle modified pucherite composite photocatalyst and a preparation method thereof. Carbon nitride nano particles are dispersedly compounded on the surface of porous pucherite, and the porous pucherite is composed of bent pucherite nanorods; the preparation method comprises the steps of firstly, preparing carbon nitride powder, adding the carbon nitride powder to high-purity water and performing ultrasonic dispersion, adding bismuth nitrate pentahydrate and stirring until the mixture is dissolved completely, adding ammonium metavanadate and continuing to stir, carrying out centrifugal separation, washing and drying to obtain a solid sample, then performing heat treatment, and grinding into powder. According to the carbon nitride nano particle modified pucherite composite photocatalyst, the carbon nitride nano particles are small and are dispersedly compounded on the surface of the porous pucherite, so as to be beneficial to exposure of carbon nitride-pucherite interfaces with high activity and reduction of a charge transferring distance, and therefore, the carbon nitride nano particle modified pucherite composite photocatalyst has wide application prospect in the fields such as environment pollution control and energy; besides, the preparation method of the composite photocatalyst is simple, low in cost and good in repetitiveness, and can well meet the requirement of volume production.

The invention discloses a nanotube array fuel battery of visible light response, which comprises a photoanode, a cathode, organic waste water, a light source, an electrolyte and a quartz reaction pool, wherein the cathode and the photoanode are respectively inserted into the organic waste water containing the electrolyte and is communicated through an external circuit; the photoanode is an electrode made from a TiO2 nanotube array film with visible light response; the light source is started for irradiating the photoanode; air is continuously introduced near the cathode; at this time, organic matter is oxidized near the photoanode; and generated electrons are transferred to the cathode through loads of the external circuit and are reduced by oxygen near the cathode. According to the invention, the purposes of treating the organic waste water and externally generating power are achieved; and the nanotube array fuel battery has higher battery performance and wider application prospect compared with the prior art.

The invention discloses a bismuth vanadate light catalyst for exposing a high-activity crystal face and a preparation method for the bismuth vanadate light catalyst. The bismuth vanadate light catalyst is a square corner cut double-cone body and can selectively expose the crystal face (010); a crystal phase is a monoclinic scheelite phase; and the particle size of the crystal phase is 500 nanometers to 3 microns. The preparation method comprises the following steps of: dissolving bismuth nitrate pentahydrate and ammonium metavanadate, which are same in molar weight, by dilute nitric acid and weak aqua ammonia, which are same in volume and concentration and are taken as solvents; under the condition of vigorous stirring, adding sodium dodecyl sulfate into a bismuth nitrate solution; then, mixing the bismuth nitrate solution and an ammonium metavanadate solution, stirring the mixed solution for a period of time, adjusting the pH value of the mixed solution to 6.5-8, crystallizing the mixed solution for 12-48 hours at 160-200 DEG C, and performing centrifugal washing and drying on a product, thus obtaining bismuth vanadate nano particles. By the simple hydrothermal synthesis preparation method, the operation is convenient, the reaction period is short, and the repetitiveness is high; and the prepared bismuth vanadate light catalyst has a good visible light response property and an excellent light catalysis property.

The invention discloses a silver phosphate-bismuth vanadate multiplex photocatalyst and a preparation method thereof. According to the silver phosphate-bismuth vanadate multiplex photocatalyst, silver phosphate nanoparticles are selectively deposited on the {010} crystal face of bismuth vanadate, the particle size of bismuth vanadate nanoparticles is 500nm-3mu m, the particle size of silver phosphate nanoparticles is 10-100nm, and the molar ratio of silver phosphate to bismuth vanadate is (1:5)-(1:20). The preparation method comprises the following steps of: firstly, dispersing a bismuth vanadate photocatalyst into deionized water; adding a water-solubility silver-bearing raw material and stirring till the water-solubility silver-bearing raw material is completely dissolved; adding a precursor containing phosphate radical and regulating the pH value; and finally, stirring the solution for 5-10hours, centrifuging, then washing and drying to obtain the final product. The silver phosphate-bismuth vanadate multiplex photocatalyst has excellent visible-light response performance and outstanding photocatalytic degradation performance and is capable of quickly degrading methylene blue dye solution within a very short time; and moreover, the preparation method of the silver phosphate-bismuth vanadate multiplex photo-catalyst is simple and easy, low in cost and good in repeatability.

The invention discloses a preparation method of nanoporous microspheres with an adsorption photocatalysis synergistic effect. The preparation method comprises the following steps: 1) preparing a pyrrole aqueous solution I, adding a nano-photocatalyst and silver nitrate, then adding an oxidizing agent and sodium bromide, reacting, centrifuging, washing and drying to obtain black powder I; 2) addingthe black powder I to a pyrrole aqueous solution II with the oxidizing agent, reacting, centrifuging, washing and drying to obtain black powder II; 3) adding the black powder II into aqueous ethanolto obtain dispersion liquid A; and mixing absolute ethyl alcohol and tetraethyl orthosilicate, and adding a polymer pore-forming agent to obtain a solution B; 4) adding the dispersion liquid A to thesolution B, after completion, adjusting the pH value to be 2 to 3, continuing to stirring to form gel, drying, grinding, washing, drying, calcining and grinding to obtain a target product. Nanoporousmicrospheres prepared by the method has large specific surface area and strong photocatalysis, and can be widely used in the fields of dye wastewater treatment, hydrogen production by photolysis of water and indoor VOCs treatment.

The invention discloses a self-biased dual-light electrode system which comprises a main reactor, an electrode fixing cover, a lead and a double-light electrode; the double-light electrode comprises aphotocathode and a photoanode; the photocathode is prepared by the following steps: dissolving Zn(NO3)2.6H2O powder and glycolic acid powder in an ethanol solution and then inserting an FTO electrodein hot water to obtain the N-Zn-MOF photocathode; the photoanode is prepared by the following steps: dissolving iron nitrate powder in DMF to obtain a solution A; dissolving 2-methyl imidazole powderin the DMF to obtain a solution B; dropwise adding the solution B in the solution A, uniformly mixing and then inserting an FTO electrode in hot water to obtain the Fe-MOF photoanode.

The invention belongs to the technical field of composites and preparation and relates to a novel compound bacteriostatic agent as well as a preparation method and an application thereof. The compoundbacteriostatic agent has the molecular formula of Ag/AgCl/Bi6O4.46(OH)3.54(NO3)5.54, is grey powder and odorless, has good visible-light response capacity and bacteriostatic ability and can have a better inhibition function on bacteria such as escherichia coli, staphylococcus aureus, salmonella and the like. Single-component Bi6O4.46(OH)3.54(NO3)5.54 is synthesized with a BiOCl conversion methodfor the first time and is bound with Ag/AgCl, and the novel bacteriostatic agent with the molecular formula of Ag/AgCl/Bi6O4.46(OH)3.54(NO3)5.54 is obtained. The compound bacteriostatic agent has unique chemical composition and good antibacterial effect, and the preparation method is scientific, has simple preparation process, is low in preparation cost and has good application prospects and market values.

The invention discloses flower type Ho-Bi2WO6 nano powder and a preparation method and application thereof. The method comprises the steps of dissolving bismuth nitrate pentahydrate, sodium tungstate dihydrate and holmium nitrate hexahydrate in water at a certain ratio; stirring uniformly and adjusting the pH value to obtain precursor liquid; preserving heat at 140-240 DEG C for 30-120 minutes at the power of 300W by a microwave hydrothermal process to obtain the flower type Ho-Bi2WO6 nano powder, wherein the main component is quadrature-phase Bi2WO6, and the Bi2WO6 contains Ho<3+>. Morphological control is always the direction of semiconductor photocatalyst study, the method disclosed by the invention combines the advantages of microwaves and a hydrothermal process, the technology is simple and easy to control, the preparation period is short, and the flower type Ho-Bi2WO6 nano powder with controllable morphology is prepared without any additive; moreover, the powder has good dispersity, uniform morphology and good photocatalytic activity and can be used for degrading organic matters.

The invention discloses a production process of a degradable sealant. The production process comprises the following steps: plastifying modified rubber and chlorinated polyethylene to obtain a plastified material, uniformly mixing the plastified material, calcium stearate, an antioxidant, a plasticizer, a photocatalyst and a degradable material, conducting cooling, and conducting chopping to form particles to obtain a mixed material; and adding the mixed material into a mixed solution of butyl acetate and methylcyclohexane, and conducting uniform dispersing to obtain the degradable sealant. In the production process, urea is added to modify titanium dioxide, so that the photocatalytic effect of the photocatalyst is improved; the degradable material is prepared by taking corn fiber as a main raw material, can be decomposed into water, carbon dioxide and inorganic small molecules by microorganisms in the nature, is high in biodegradation efficiency and does not cause environmental pollution; by using the photocatalyst and the degradation material, the degradation rate of the degradable sealant is high; and the modified montmorillonite and the modified nylon staple fibers are added into the rubber, so that the sealant added with the modified rubber has excellent mechanical properties.

The invention discloses a preparation method of a magnetic Cu-MOF-based photocatalyst, and the method comprises the following steps: under closed conditions, uniformly mixing copper nitrate trihydrateCu(NO3)2.3H2O with organic ligand H3L, Fe3O4 magnetic nanoparticles, template agents piperazine hexahydrate, N, N-dimethylformamide and absolute ethyl alcohol, continuously stirring, and dropwisely adding a concentrated nitric acid solution to regulate the pH value of a reaction system to 4.0-6.0, and reacting under a solvothermal condition to obtain the magnetic Cu-MOF-based photocatalyst. The absorption wavelength range of the material to visible light is 475-800nm, and the material shows excellent visible light response capability; the magnetic CuMOF-based photocatalyst has good thermal stability, can maintain the stability of a framework at 265 DEG C or below, and shows good photocatalytic degradation efficiency, water stability and recyclability when used for the photocatalytic degradation of active dark blue K-R in water.

The invention discloses a method for preparing magnetic MoS<2>/Fe<3>O<4>/RGO (reduced graphene oxide) three-way composite visible-light-driven photocatalysts and application thereof. The method includes adding 1.52 g of CH<4>N<2>S and 0.7 g of (NH<4>)<6>MoO<7>O<24> <4>H<2>O into water and carrying out ultrasonic treatment for 20 min; adding 0.12 g of Fe<3>O<4> and 0.03 g of graphene oxide into thewater, carrying out ultrasonic treatment for 20 min to obtain substances, then transferring the substances into a hydrothermal reaction kettle, and keeping the substances at the temperatures of 200 DEG C for 8 h; naturally cooling the substances, centrifuging the substances, washing the substances by the aid of water thrice and drying the substances in a vacuum drying tank at the temperatures of60 DEG C for 12 h to obtain the magnetic MoS<2>/Fe<3>O<4>/RGO three-way composite visible-light-driven photocatalysts. The method and the application have the advantages that nitrophenol organic wastewater with the concentration of 5 mg/L can be quickly photocatalytically degraded by the magnetic MoS<2>/Fe<3>O<4>/RGO three-way composite visible-light-driven photocatalysts under visible light irradiation, the used magnetic MoS<2>/Fe<3>O<4>/RGO three-way composite visible-light-driven photocatalysts can be separated by the aid of external magnetic fields and then can be recycled, accordingly, secondary pollution can be prevented, and the magnetic MoS<2>/Fe<3>O<4>/RGO three-way composite visible-light-driven photocatalysts have excellent development and application prospects in practical application of degradation organic pollutant treatment technologies.

The invention discloses a preparation method for a silver iodide-loaded photo-catalytic material. The photo-catalytic material has high specific surface area and excellent visible-light response property. The preparation method comprises the following steps: a) dropwise adding silver nitrate and iodine compound into a nonionic surfactant solution, stirring under light-shielding state and ultrasonically treating, thereby acquiring a nanometer silver iodide complex; b) adding nonionic surfactant, cosolvent, solvent and water into a reactor, heating to 45-60 DEG C, stirring till fully dissolving, and then adding the nanometer silver iodide complex and uniformly stirring; and c) adding a molecular sieve, dipping for 6-24h and then filtering, washing and roasting an acquired sample for 4-8h at 350-450 DEG C, thereby acquiring the silver iodide-loaded photo-catalytic material.