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 preparation method of a nitrogen-doped titanium dioxide nanotube with response to visible lights, and comprises the following steps: a. metallic titanium or titaniferous compounds are used for preparing a metatitanic acid nanotube with a hydrothermal or solvothermal method; b. the metatitanic acid or titanium dioxide nanotube that is prepared by step a or a commercial metatitanic acid or titanium dioxide nanotube is dispersed in a water solution with nitrogen sources or a water and alcohol mixed solution, and agitated or ultrasonically processed for 10 minutes to 10 hours; c. serum that is obtained by step b is placed into a reaction kettle with polyfluortetraethylene lining and processed by sealed heating for 10 minutes to 10 days, and the reaction temperature is 50 to 350 DEG C; and d. the product obtained by step c is washed by deionized water, dried and baked, thus obtaining the nitrogen-doped titanium dioxide nanotube. The preparation method of the nitrogen-doped titanium dioxide nanotube of the invention has simplicity, cleanness and environmental protection, is applicable to batch preparation, and has low cost and strong adaptability, wide application of the prepared nitrogen-doped titanium dioxide nanotube.

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 provides a magnetic composite photocatalyst Ppy@CdS / ZnFe2O4 and a preparation method and application thereof. The preparation method comprises the following steps of ZnFe2O4 preparation, CdS / ZnFe2O4 preparation and Ppy@CdS / ZnFe2O4 preparation. The composite photocatalyst Ppy@CdS / ZnFe2O4 established through a molecular imprinting technology can form a Z-type heterojunction due to printing layer selectivity and CdS and ZnFe2O4 matching, so that a composite photocatalytic material prepared by the magnetic composite photocatalyst has certain selectivity and catalytic activity.

The invention discloses silver-loaded nanometer titanium dioxide photocatalyst and a preparation method thereof. The titanium dioxide nanometer particle is of a cup-shaped structure and has anatase crystalline phase with a particle diameter of 140nm-160nm. The silver colloid particle is loaded on inner and outer surfaces of the titanium dioxide nanometer particle with the cup-shaped structure. The preparation method of the silver-loaded nanometer titanium dioxide photocatalyst comprises the following steps of: synthesizing by a using a surfactant template method, etching hollow spherical titanium dioxide into a cup-shaped structure by using high-concentration sodium hydroxide; and loading the silver colloid particle to form the silver-loaded nanometer titanium dioxide photocatalyst. The photocatalyst disclosed by the invention has a high specific surface area, good visible light response performance and visible light catalytic activity, and has excellent performances which are not superior to those of commercial catalysts in terms of degradation of organic pollutants and the like. Moreover, the preparation method is simple and easy to implement and has the advantages of low price, good repeatability and the like.

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 discloses a method for preparing g-C3N4 / CdS composite catalyst through photodeposition. The method comprises the following steps: synthesizing a g-C3N4 nano-sheet through a tripolycyanamide polymerization, irradiating a mixed solution containing sulfur source, cadmium source and g-C3N4 after eliminating the oxygen through light irradiation, and selectively depositing CdS on the surface of the g-C3N4. By utilizing the reducing capacity of the g-C3N4 photo-induced electron, the CdS is formed in situ at a reducing site of the g-C3N4; the precise regulation and control on the location of the CdS on the g-C3N4 lamella is realized. The g-C3N4 / CdS prepared according to the invention shows excellent photolysis water-making hydrogen performance and circular use performance.

The invention discloses preparing methods and applications of a visible-light-responsive bismuth oxysalt photocatalyst Bi<16>Te<5>O<34>, and belongs to the field of inorganic photocatalytic materials. The catalyst is prepared by a sol gel method and a co-precipitation method respectively. The preparing methods are simple and low in cost. The photocatalytic material prepared by the methods has uniform granularity, good chemical stability and excellent photocatalytic performance, can effectively degrade organic pollutants under visible light irradiation, and has a wide application prospect in the fields of sewage treatment and environment protection.

The invention discloses a visible light response type photocatalytic material of tantalum nitride modified by cobalt and a preparation method thereof. The preparation method includes cleanly washing a pure tantalum foil, using the pure tantalum foil as a substrate, dropping a precursor solution A containing Ta5+ onto the substrate, air drying at the room temperature to obtain a tantalum foil loaded with Ta5+, dropping a precursor solution B containing metal cobalt ions onto the tantalum foil loaded with Ta5+, air drying at the room temperature to obtain a tantalum foil loaded with Ta5+ and the metal cobalt ions, and subjecting the tantalum foil loaded with Ta5+ and the metal cobalt ions to a constant temperature calcination in a flowing anhydrous ammonia gas atmosphere to obtain the photocatalytic material. By means of the method, the prepared photocatalytic material has the advantages that the stability of Ta3N5 is effectively improved, the self oxidation of the Ta3N5 is inhibited, the electron transfer can be facilitated, the photoproduction electron-hole pair recombination is inhibited, and the photolysis efficiency is improved.

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 relates to a preparation method for an easy-to-recover infusorial earth / Ta3N5 visible-light photocatalyst. The method comprises the steps as follows: (1), tantalate or inorganic tantalate is dissolved in an anhydrous low alcohol, powder of infusorial earth is added, and after ultrasonic treatment and stirring, a uniform mixture is obtained; (2), the uniform mixture is placed in a sealed container which is filled with distilled water in advance, the uniform mixture and the distilled water are not in direct contact, the sealed container is heated, kept warm and cooled to a room temperature, and infusorial earth / Ta2O5 nuclear / shell power is obtained after washing and drying; and (3), the infusorial earth / Ta2O5 nuclear / shell power is placed in an alumina pipe furnace, the alumina pipe furnace is introduced with high-purity ammonia gas, heated up, kept warm, and naturally cooled to a room temperature under flowing ammonia gas, and then the infusorial earth / Ta3N5 visible-light photocatalyst is obtained. The preparation method is simple, has low requirements on equipment, and is suitable for industrial production; and the obtained infusorial earth / Ta3N5 powder has a strong adsorbability and good visible light responsiveness, and is easy to recover.

The invention provides a method for preparing a multi-phase photonic Fenton catalyst from city sludge and red brick wastes. As city sludge and red brick wastes are adopted as raw materials, gasses released from organic matters in sludge in high-temperature pyrolysis are adopted as a catalyst pore forming agent, minerals formed because of high-temperature melting of inorganic ash in the sludge andred bricks are adopted as a catalyst carrier, and iron in the red brick wastes is adopted as an active component of the catalyst, the catalyst is easy in raw material obtaining, low in cost, high in benefit, large in specific surface area, good in visible light response, stable in product quality, and the like; secondly, the method has the characteristics of being simple in process, relatively lowin production cost, easy in on-scale production, good in waste recycling, and the like.

The invention relates to the technical field of photocatalysts, and particularly relates to a preparing method of a Cu2S / g-C3N4 heterojunction photocatalyst. The method includes one-step calcining todirectly obtain the Cu2S / g-C3N4 composite catalyst. A certain amount of cuprous thiocyanate is mixed with ammonium chloride, the mixture is fully ground and then calcined in a tubular furnace, and a product is washed with distilled water and then dried to obtain the Cu2S / g-C3N4 heterojunction photocatalyst. The photocatalyst is prepared through a one-step calcining manner, and a preparation process is simple. The photocatalyst has good visible light response capability, a heterojunction structure facilitates separation of photo-induced electron and holes, catalytic activity is high, and the photocatalyst has high practical value and a good application prospect in the field of environment protection. Raw materials of the photocatalyst are easily available and low in cost, a reaction condition is mild, and the method is free of environment pollution and prone to industrial production.

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 an In-MOF material based on a tricarboxylic acid ligand, the chemical formula of the InMOF material is {[(CH3)2NH2]2(In3O4L1)}n.(solvent)x, wherein H3L is a triangular organicligand 4, 4',4"[benzoyl tri(carbonyl benzene)]-3,3',3" trimethyl tribenzoic acid; the invention also discloses a preparation method of the material, which comprises the following steps: dissolving indium nitrate trihydrate, the organic ligand H3L and hexamethylenetetramine in N,N-dimethylformamide, dropwisely adding a concentrated nitric acid solution to regulate the pH value, and reacting under solvothermal conditions to obtain. The In-MOF material disclosed by the invention has a visible light absorption wavelength range of 400-650nm, has excellent visible light response capability, and shows good photocatalytic degradation efficiency, water stability, easiness in recovery and recyclability when being used for the photocatalytic degradation of methyl orange 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 method for preparing a copper sulfide / bismuth vanadate double-layer membrane composite material. The method first uses an electrochemical deposition method to prepare porous BiVO. 4 Photoelectrode, and then use a simple drop coating method to load CuS on BiVO 4 On the electrode, CuS / BiVO is obtained 4 Double-layer membrane composite material. Since CuS is a narrow bandgap p-type semiconductor, its bandgap width is almost close to that of the semiconductor Si material, and it has good visible light absorption performance and conductivity; BiVO 4 It is an n-type semiconductor with high visible light responsiveness and adjustable electronic structure. The two are combined to form a double-layer CuS / BiVO 4 The thin film constitutes a p-n heterostructure in which the valence band and conduction band intersect. This structure facilitates the rapid separation of photogenerated carriers and reduces the recombination of electron-hole pairs, thereby improving BiVO 4 The excellent photoelectrochemical properties make it a good application prospect as a photoanode material in photocatalytic water splitting and hydrogen production reactions.

The invention discloses a preparation method of titanium dioxide with adjustable colors and efficient photocatalytic activity, belongs to the technical field of chemistry and material science, and solves the technical problems that in the prior art, the preparation method of visible-light response titanium dioxide is high in cost, complicated in steps, and poor in stability, and furthermore the prepared titanium dioxide is not adjustable in color, and low in catalytic activity. The preparation method disclosed by the invention comprises the following steps: uniformly mixing a metal hydride with titanium dioxide to obtain a mixture; under the protection of an inert gas, performing a solid-phase reaction on the mixture at 200-400 DEG C, and obtaining the titanium dioxide with adjustable colors from light gray to blue and black finally. The preparation method is simple, controllable, low in cost, and convenient for mass production; in the meantime, the prepared titanium dioxide is adjustable in colors, stable in physicochemical property and high in photocatalytic activity, and can be widely applied to the fields of self-cleaning coatings, paints, coatings, photocatalysis, solar cells and the like.

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.