73results about How to "Improved visible light responsiveness" patented technology

The invention belongs to the technical field of environmental materials and particularly relates to a photocatalytic material and a preparation method therefor. The preparation method comprises the steps of dispersing anatase-phase nano titanium dioxide into dichloromethane so as to obtain a white suspension, then, dropwise adding isocyanate into the suspension, and carrying out stirring reaction; and adding a cyanamide compound, carrying out stirring reaction, carrying out suction filtration at reduced pressure so as to obtain a titanium dioxide/cyanamide compound, and carrying out calcining and natural cooling, thereby obtaining a nitrogen-doped titanium dioxide/graphite-phase carbon nitride composite material. According to the photocatalytic material and the preparation method therefor, isocyanate serves as a bridging body to combine the cyanamide compound and nano titanium dioxide in the form of chemical bond, carbon nitride is subjected to in-situ growth on surfaces of titanium dioxide particles under high-temperature conditions, and heterojunctions with electron conduction capacity are formed between carbon nitride and titanium dioxide, so that the photocatalytic property of the composite material is improved.

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 a special antibacterial wool fiber for a wool hat. The preparation method comprises the steps of dipping the wool fiber in acetone, airing after washing, adding into a mixed aqueous solution of sodium cyanate and hydrogen peroxide, airing after dipping, and irradiating through an ultraviolet light to obtain a pretreated wool fiber; adding thiourea, urea and butyl titanate into absolute ethyl alcohol for mixing, adjusting a pH value, adding deionized water for stirring until a Tyndall effect occurs, standing for ageing, drying, grinding, and calcining to obtain modified nanometer titania; adding chitosan into an acetic acid aqueous solution, adjusting a pH value, adding the modified nanometer titania, adjusting a system pH value, adding glutaraldehyde after temperature rising, standing for reacting, centrifuging, washing, and drying to obtain modified chitosan; adding the modified chitosan, a plant extract, beta-cyclodextrin and a silane coupling agent KH-550 into the deionized water, and stirring to obtain an antibacterial solution; adding the pretreated wool fiber into the antibacterial solution for padding processing, and baking after drying.

The present invention provides a g-C3N4-ZnO/HNTs composite photocatalyst, a preparation method therefor, and an application thereof, and belongs to the technical field of preparation of environment-friendly materials; The method comprises: preparing a ZnO/HNTs precursor by use of a secondary calcination method; preparing the g-C3N4-ZnO/HNTs composite photocatalyst by virtue of high-temperature calcination; and using the obtained g-C3N4-ZnO/HNTs composite photocatalyst with a tubular structure coated by a reticular layer to degrade tetracycline in antibiotic wastewater. The preparation method disclosed by the invention is simple, does not cause resource waste and secondary pollution, and is a green, environment-friendly and efficient pollution treatment technology.

The invention relates to a photo-responsive titania nanotube-supported catalyst electrode and a preparation method thereof, and belongs to a catalytic electrode material and preparation thereof in a fuel cell. A titania nanotube is adopted as a catalyst carrier of at least one noble metal in platinum, palladium, gold and silver; a photo-responsive semiconductor electrode is obtained by graphene modification, so that, on one hand, a titania nanotube array has good acidic and basic stability and excellent photoelectric property, and on the other hand, the electrical conductivity and the visible light response performance of the semiconductor electrode are enhanced by modification on the titania nanotube by graphene. By the preparation method provided by the invention, the dispersity of the catalyst and the visible light response of the electrode can be improved by the catalyst electrode, so that the catalysis efficiency of the noble metal catalyst is improved.

A preparation method of bismuth tungstate nitrogen and sulfur co-modified biochar is disclosed and comprises the following steps: S1, carrying out infiltration modification on a biochar raw material with thiourea, and placing the modified material in nitrogen for a reaction so as to obtain nitrogen and sulfur doped modified biochar, S2, preparing a mixed solution of sodium oleate and bismuth nitrate pentahydrate by taking ethylene glycol as a solvent, S3, adding sodium tungstate dehydrate into the mixed solution of sodium oleate and bismuth nitrate, S4, adding the nitrogen-sulfur doped modified biochar obtained in the step S1 into the mixed solution obtained in the step S3, S5, enabling the mixed solution obtained in the step S4 to react, S6, obtaining a reactant solid obtained after the reaction in the step S5, and S7, drying the reactant solid to obtain the bismuth tungstate nitrogen and sulfur co-modified biochar. The bismuth tungstate nitrogen and sulfur co-modified biochar can promote adsorption of organic matters and heavy metals and improve the photocatalytic performance.

The invention provides a preparation method and application of a two-dimensional thin layer CdS/g-C3N4 composite photocatalyst. The preparation method comprises the following preparation steps that 1,urea is placed in a muffle furnace for high-temperature calcination to obtain a two-dimensional thin layer g-C3N4 precursor; 2, the two-dimensional thin layer g-C3N4 precursor is added to a nitric acid solution and subjected to stirring treatment under the condition of heating in a water bath, an obtained solid sample is washed to neutral, vacuum-dried, calcined, cooled to the room temperature and then ground, and a two-dimensional thin layer g-C3N4 nanosheet is obtained; and 3, the two-dimensional thin layer g-C3N4 nanosheet is subjected to ultrasonic treatment in a solution containing Cd<2+>, centrifugation is performed, an obtained solid is added to a solution containing S<2-> for ultrasonic treatment continuously, and the two-dimensional thin layer CdS/g-C3N4 composite photocatalyst is obtained. According to the preparation method and application of the two-dimensional thin layer CdS/g-C3N4 composite photocatalyst, the two-dimensional thin layer g-C3N4 nanosheet is prepared by simple and convenient calcination, acid treatment and secondary calcination, and the high-efficiency two-dimensional thin layer CdS/g-C3N4 composite photocatalyst is prepared by a simple successive ioniclayer adsorption and reaction method.

The invention discloses a carbon nitride composite photocatalyst, a preparation method and application thereof. The preparation method comprises: (1) putting C3N4 powder in an ethanol solution for ultrasonic treatment to obtain a milk-white C3N4 stripping liquid; (2) putting Bi(NO3)3.5H2O powder and AgNO3 powder in the C3N4 ultrasonic stripping liquid, and then performing stirring under a shadingenvironment to obtain a mixed solution; and (3) adding a Na3VO4 solution into the mixed solution prepared by step (2) dropwise, conducting stirring, centrifugation, drying and grinding treatment to obtain BiVO4/Ag3VO4/C3N4. In the preparation process of BiVO4/Ag3VO4, C3N4 is introduced synchronously, and on the basis, in order to further broaden the visible light responsiveness, the ultrasonic stripped C3N4 stripping liquid is selected to prepare a BiVO4/Ag3VO4/C3N4 ternary heterojunction.

The invention discloses a preparation method of a Fe2O3-MoS2-Cu2O photocatalyst film. The method comprises the following steps of (1) using a Fe<2+> precursor solution as an electrolyte; performing electrodeposition on a conducting substrate; then, performing roasting treatment to obtain a Fe2O3 film; (2) soaking the Fe2O3 film into a MoS2 precursor solution; preparing a Fe2O3-MoS2 film by a hydro-thermal method; (3) using a Cu2O precursor solution as an electrolyte; performing electrophoretic deposition on the Fe2O3-MoS2 film to prepare a Fe2O3-MoS2-Cu2O photocatalyst film. The invention also discloses the Fe2O3-MoS2-Cu2O photocatalyst film prepared by the method, and application of the film to treatment of phenol-containing wastewater. The preparation process is simple; the repeatability is high; in addition, the economic cost is lower. Through the combination of three photocatalysts with different energy belt structures, the synergic effect is achieved; the photocatalyst performance is greatly improved.

The invention discloses a preparation method of a bismuth vanadate doped graphite phase carbon nitride nanosheet photocatalyst. The mehod comprises the following steps: adding graphite phase carbon nitride into an acetic acid solution, stirring, and carrying out ultrasonic treatment; adding bismuth chloride and sodium metavanadate into the solution; adjusting the pH value of the solution to 5-7; heating the mixed solution at 160-200 DEG C to react for 8-20 hours; and centrifugally separating, washing, and drying to obtain the catalyst. According to the invention, according to the characteristics that graphite-phase carbon nitride is non-toxic, easy to prepare, stable in thermodynamic and chemical properties, high in photocatalytic reducibility, narrow in bismuth vanadate band gap width, high in photocatalytic oxidation, capable of responding to visible light and having energy level difference, and the like, a bismuth vanadate doped graphite-phase carbon nitride nano composite materialis constructed, wherein the photon-generated carrier separation efficiency is remarkably improved, the recombination rate is greatly reduced, the response range of the material to visible light is further widened, and the oxidation-reduction capability is enhanced, so that the photocatalytic performance is further improved, and the composite material can be used for removing organic pollutants inthe environment and reducing CO2.

The invention discloses a perovskite type photocatalyst with double modification of doping and loading. The catalyst combines double advantages of synchronous doping and loading and collaborative loading so as to have a high visible-light response capability. The invention also discloses a preparation method of the perovskite type photocatalyst with the double modification of doping and loading. The preparation method comprises the steps of firstly utilizing an improved sol-gel method to synchronously realize synchronous modification of Mg on inside and outside of a LaCoO3 crystal lattice, and further utilizing a photo-reduction method for reducing and loading Ag to the surface of the catalyst. According to the catalyst loaded with the Ag, on one hand, due to a surface plasmon resonance effect of an embedded Ag nanometer particle, a local electric field is enhanced, and an electron transfer phenomenon is facilitated, so that a response capability of the catalyst on visible light is improved; on the other hand, due to collaborative loading of the Ag and MgO, the transition transfer of catalyst surface electron is facilitated, so that dye degradation is jointly promoted.

The invention discloses a high efficient visible-light response catalyst, which is characterized in that the catalyst is of a composite oxide, the chemical composition general formula is xVSmO, wherein x is n(V)/n(Sm), and x is more than 0.5 and less than 4.5. A preparation method for the catalyst comprises the following steps of: mixing samarium nitrate solution and ammonium metavanadate solution by stirring to obtain precipitate, then rotationally evaporating for removing water, and roasting the mixture in a muffle furnace at 300-700 DEG C after the mixture are dried in a baking oven. The invention has simple preparation technique; the prepared VSmO photocatalyst has excellent capability of catalyzing and oxidizing organic pollutants by visible light; after being loaded with precious metals, the photocatalytic activity and the deep oxidation capability of the catalyst can be obviously improved.

The invention discloses a visible light response type Zn2TiO4/g-C3N4 heterojunction material and an application thereof. The preparation method comprises the following steps: adding zinc titanate Zn2TiO4 powder and melamine powder into deionized water, carrying out ultrasonic treatment for 1 hour, and then stirring for 12 hours to form a uniform dispersion liquid; drying the obtained dispersion liquid to obtain a precursor; and placing the obtained precursor in a muffle furnace for high-temperature calcination to obtain the Zn2TiO4/g-C3N4 heterojunction material. According to the preparation method disclosed by the invention, g-C3N4 and Zn2TiO4 are compounded, so that the visible light response type Zn2TiO4/g-C3N4 heterojunction material is successfully prepared, and the catalyst is applied to photocatalytic nitrogen fixation for ammonia production. Results show that the prepared Zn2TiO4/g-C3N4 heterojunction material has relatively good photocatalytic nitrogen fixation and ammonia production performance, is simple to operate, has a popularization effect on photocatalytic green ammonia synthesis, and has the advantages of energy conservation and environmental protection.

The invention provides a Co/V double-metal-doped g-C3N4 photocatalyst and a preparation method and application thereof, and belongs to the technical field of photocatalyst synthesis. According to thepreparation method, the Co/V double-metal-doped g-C3N4 photocatalyst is synthesized in one step through a simple and rapid thermal polymerization method, g-C3N4 is modified through element doping, andthe visible light response range is directly expanded through the double-doping effect of Co/V elements. The Co/V double-metal-doped g-C3N4 photocatalyst can be used for visible light catalytic degradation of tetracycline hydrochloride pollutants.

The invention relates to the technical field of photoelectrocatalysis, and provides a preparation method of a copper tungstate photo-anode film. The preparation method comprises the following steps: mixing copper nitrate trihydrate, ammonium metatungstate and water to obtain a precursor solution; carrying out ultrasonic spray pyrolysis coating on the obtained precursor solution to form a copper tungstate precursor film on the substrate; and carrying out heat treatment on the obtained copper tungstate precursor film to obtain the copper tungstate photo-anode film. According to the preparation method, the precursor solution can be atomized into nanoscale small liquid drops by adopting an ultrasonic spray pyrolysis coating method, the solid film with uniform thickness is finally formed on the substrate through reaction processes such as solvent evaporation and solute thermal decomposition, crystallization of the precursor film can be promoted during heat treatment, and the uniformity of the structure of the copper tungstate photo-anode film is further improved, so that the visible light responsiveness of the copper tungstate photo-anode film can be improved. Experimental results show that the copper tungstate photo-anode film prepared by the preparation method provided by the invention is uniform in thickness and has excellent photoelectric properties.

The invention relates to a visible light photocatalyst, a modified PVDF ultrafiltration membrane and a preparation method and application thereof. In a Bi2MoO6/CuS visible light photocatalyst, the mass ratio of Bi2MoO6 to CuS is (20-100): 1, and CuS is dispersed on the surface of Bi2MoO6 to form hollow flower-shaped spheres; in the ultrafiltration membrane, PVDF is used as a matrix, and a Bi2MoO6/CuS nano photocatalyst is used as an active component; the ultrafiltration membrane is prepared from the following components in parts by weight: 17 to 19 parts of polyvinylidene fluoride, 2.5 to 3.5parts of polyvinylpyrrolidone, 77 to 79 parts of N, N-dimethylacetamide and 0.5 to 1.5 parts of Bi2MoO6/CuS nano photocatalyst. Compared with the prior art, the modified membrane provided by the invention is uniform in membrane pore distribution and good in photocatalytic activity, can generate hydroxyl radicals and oxygen anions with an oxidation effect on the surface of the membrane under the irradiation of visible light, and can kill attached bacteria and degrade attached organic pollutants, so that the formation of a biological membrane on the surface of the membrane can be remarkably inhibited, and a good membrane pollution control effect is achieved.

The invention provides a g-C3N4/WO3.H2O/Pd ternary composite photocatalyst as well as a preparation method and application thereof, and belongs to the technical field of preparation of environmental protection materials. The preparation method comprises the following steps: firstly, obtaining bulk phase g-C3N4 through a calcination method, then treating the bulk phase g-C3N4 with nitric acid, carrying out secondary calcination to obtain a g-C3N4 nanosheet, and obtaining a WO3.H2O nanosheet through a hydrothermal method; then, compounding the g-C3N4 nanosheet with the WO3.H2O nanosheet by virtue of an electrostatic self-assembly method; finally, the prepared Pd nanosheets are loaded on the g-C3N4/WO3.H2O composite material through a hydrothermal method to prepare the two-dimensional thin-layer S-type g-C3N4/WO3.H2O/Pd composite photocatalyst, and the two-dimensional thin-layer S-type g-C3N4/WO3.H2O/Pd composite photocatalyst can be applied to the field of photocatalytic CO2 gas reduction. The efficient two-dimensional thin-layer S-type g-C3N4/WO3.H2O/Pd composite photocatalyst is prepared through the simple preparation method and operation process, no sacrificial agent is added, secondary pollution is avoided, and the photocatalyst is an effective and environment-friendly CO2 reduction photocatalyst.

The invention discloses a modified carbon nitride and tungsten oxide coupled p-n type heterojunction composite material and a preparation method and application thereof in preparation of a photocatalytic bactericide. The preparation method comprises the following steps: uniformly mixing melamine, triaminoimine and tungstic acid, and performing calcining at 500-550 DEG C in an inert atmosphere for1-6 hours to obtain the modified carbon nitride and tungsten oxide coupled p-n type heterojunction composite material. The invention also discloses a photocatalytic sterilization method of E.Coli-containing wastewater, which comprises the following steps: adding the modified carbon nitride and tungsten oxide coupled p-n type heterojunction composite material into the E.Coli-containing wastewater,carrying out dark reaction adsorption equilibrium, and carrying out visible light irradiation to carry out photocatalytic sterilization.

The invention discloses a photocatalyst for degrading an organic pollutant and a preparation method thereof. The catalyst is silver bromide modified nano vanadate samarium; the chemical composition formula is x AgBr/SmVO4; x is atomic ratio of silver to samarium, and x is smaller than or equal to 2.119 and greater than or equal to 0.353. The preparation method comprises the steps of: (1) weighing samarium oxide and ammonium metavanadate, respectively dissolving into nitric acid to mix with ammonia water, adjusting pH to obtain sediment, wherein the mixture is I; (2) weighing silver nitrate (nAg/nSm is smaller than or equal to 2.119 and greater than or equal to 0.353), dissolving into deionized water, adding to I, and agitating to obtain mixture II; (3) weighing sodium bromide (nBr/nAg=1), dissolving into the deionized water, adding to II, agitating and aging and then centrifugally washing, baking at 120 DEG C, grinding, and roasting at 300-600 DEG C, and cooling to obtain the product. The catalyst is simple in preparation method, and excellent in visible light photocatalytic degradation performance as to a plurality of organic pollutants.