811 results about "Visible light photocatalytic" patented technology

Provided is a visible light photocatalyst and a preparation method therefor. The visible light photocatalyst comprises down conversion materials and semiconductor materials. The mass percent of the down conversion materials to the semiconductor materials is 0.5%-5%. The visible light photocatalyst with down conversion functions is advantaged by high visible light catalytic degradation rate, no pollution, simple preparation method and low cost. The invention also provides a preparation method for the visible light photocatalyst with down conversion functions.

The invention discloses a high-efficiency graphene/silver phosphate composite visible light photocatalyst and a preparation method thereof, belonging to the technical field of composite materials and environmental management photocatalysis. The preparation method comprises the following steps: dissolving graphene oxide in water, and carrying out ultrasonic treatment to obtain a graphene oxide dispersed liquid; dissolving silver nitrate in deionized water, gradually and dropwisely adding into the graphene oxide dispersed liquid while stirring to obtain a mixed solution, uniformly stirring, and aging; dropwisely adding a prepared disodium hydrogen phosphate or sodium dihydrogen phosphate solution into the graphene oxide-silver nitrate mixed solution, continuing stirring, transferring into a hydrothermal reaction kettle, carrying out hydrothermal reaction, and cooling to room temperature; and washing the reaction product, and carrying out vacuum drying to obtain the visible light photocatalyst. The invention has the advantages of wide material sources and simple preparation process; and the obtained composite material has the advantages of controllable structure and regular pattern, and has high-efficiency degradation effect on organic dyes rhodamine B and methylene blue with certain concentration under the visible light irradiation.

The invention relates to a visible light photocatalytic film and a preparation method thereof and a lighting lamp with the visible light photocatalytic film, the lighting lamp comprises a casing, a LED (light-emitting diode) light source arranged on the casing, and a netted lampshade arranged on the outer side of the LED light source, the surface of the netted lampshade is coated with the visible light photocatalytic film doped with a quantum dot material and a semiconductor material. The netted lampshade can achieve air circulation, and improves the purification effect of air; the quantum dot material can make the absorption spectrum of the semiconductor material broadening and redshifting, so that absorbed light shifts from ultraviolet range to visible light range, the absorption of visible light is facilitated, and the lighting lamp is more secure; the visible light photocatalytic thin film absorbs the visible light in the LED light source , and then forms electrical acupunctures and free electrons on the surface of the quantum dot material, the electrical acupunctures and the free electrons are combined with water and oxygen in the air for redox reaction and formation of strongly oxidative hydroxyl radicals and active ions on the surface, so that organic matters and harmful gases and other materials in the air are decomposed to achieve the air purification, sterilization, deodorization and mildewproof effects.

The invention discloses a method for preparing a titanium dioxide-supported noble metal visible light photocatalytic material, which comprises: adding titanium dioxide microspheres or titanium dioxide nano sheets into absolute ethanol to obtain suspension; introducing nitrogen, irradiating with ultraviolet light for 1 to 20 minutes in the absence of oxygen; injecting a certain amount of a noble metal precursor into the suspension in dark when the white titanium dioxide turns light blue first and then dark blue, so that metal ions are converted into monomer metal nano particles under the reducing action of Ti<3+> and the monomer metal nano particles are deposited on the surface of the titanium dioxide; and thus, obtaining the titanium dioxide-supported noble metal visible light photocatalytic material. The electrons generated by the noble metal nano particles supported by the preparation method under the excitation of visible light can be transferred to the titanium dioxide serving as a carrier effectively, so that selective photooxidation reaction can be performed with high efficiency.

The invention relates to a silver doped grapheme-zinc oxide nano composite photocatalytic material and a method for preparing the same and belongs to the technical field of nano composite materials and photocatalysis. Graphite oxide is subjected to ultrasonic dispersion to obtain a dispersion solution of graphene oxide; precursors of silver ions and zinc ions are added in the dispersion solution of the graphene oxide, and the mixture is placed into a reaction kettle to be subjected to hydro-thermal treatment to be prepared into the silver doped grapheme-zinc oxide nano composite photocatalytic material in situ after the pH is regulated to an alkaline condition. Photocatalytic degradation experiments show that the silver doped grapheme-zinc oxide nano composite photocatalytic material prepared through the method has good adsorption and visible light photocatalytic degradation effects on rhodamine B and is an ideal nano composite photocatalytic material.

The invention belongs to the technical field of treatment and application of nanometer materials and industrial and agricultural wastewater, and provides a magnetic Fe3O4/SiO2/TiO2/quantum dot compounded nanometer photocatalyst and a preparation method and application thereof. The preparation method comprises the following steps of: synthesizing an Fe3O4 magnetic nucleus by a coprecipitation method; preparing an SiO2 protective layer by virtue of hydrolysis reaction and polycondensation reaction of TEOS (Tetraethyl Orthosilicate); then preparing a TiO2 layer on the surface of the SiO2 protective layer by a sol-gel method; and finally modifying Fe3O4/SiO2/TiO2 nanoparticles by CdS and CdSe quantum dots. The obtained magnetic Fe3O4/SiO2/TiO2/quantum dot compounded nanometer photocatalyst has very good visible-light photocatalytic capability, can be conveniently and fast recovered and reused by an external magnetic field, and can be used for removing organic pollutants of azo dyes contained in the industrial wastewater.

The invention provides a composite fiber material applied to visible light photocatalytic purification of sewage and air pollutants and a preparation method thereof. The composite fiber material is synthesized by loading a visible light response type bismuth-based photocatalytic material on a textile fiber material through a green chemical synthetic route. A powdered photocatalyst is solidly loaded by the unique net-like felt structure of the textile fiber material, so that the catalyst is prevented from losing and agglomerating during sewage treatment and air purification, and the separability and reusability are improved.

The invention discloses a Cu2O-TiO2/g-C3N4 ternary complex and a preparation and application method thereof. The preparation method comprises the steps that firstly, urea and TiO2 are mixed through a simple physical method, water is added to the mixture, the mixture is dried by distillation, calcination is conducted, and then a binary complex of TiO2/g-C3N4 is obtained; secondly, by means of sediment and reduction processes, the Cu2O-TiO2/g-C3N4 ternary complex is prepared. The preparation method is simple, cost is low, and industrial production is facilitated. The prepared ternary complex serves as a visible-light-driven photocatalyst which has high catalytic activity in the visible region, the catalytic efficiency is high, and various organic pollutants in a solution can be degraded instantly; the prepared ternary complex can also serve as a visible-light-driven photocatalyst which is applied to hydrogen preparing of photocatalytic water splitting, degrading of volatile organic pollutants in air and the like, and very good application prospects are achieved.

Belonging to the field of material preparation and energy environment, the invention provides a metal/metal oxide/g-C3N4 composite photocatalytic material and a preparation method thereof. The metal/metal oxide/g-C3N4 composite photocatalytic material is characterized in that: it is formed by lamellar g-C3N4 and first metal particles and second metal's oxide nanoparticles deposited on the lamellar g-C3N4 surface. In the composite photocatalytic material, the mole percentage of the first metal and the second metal's oxide is adjustable in the range of 1:10-10:1. The composite photocatalytic material provided by the invention has strong surface plasma effect and good catalysis ability, and high visible light photocatalytic activity. The method has the characteristics of simple preparation process, easy control, and low synthesis cost.

The invention provides a preparation method of a glass fiber loaded silver-silver bromide-titanium oxide composite material. The method comprises the following steps: with an organic or inorganic titanium compound as a titanium source and glass fibers as a carrier, obtaining a spherical titanium dioxide (TiO2) nano particle loaded threaded glass fiber composite material by a hydrolysis method under an acidic condition; impregnating the composite material in an ethylene glycol solution containing silver nitrate, and subsequently, adding dropwise an ethylene glycol solution containing potassium bromide to generate an AgBr-TiO2/glass fiber composite material; and finally, reducing partial Ag<+1> in the AgBr-TiO2/glass fiber composite material into metal Ag, thus obtaining an Ag-AgBr-TiO2/glass fiber composite photocatalyst. The method provided by the invention realizes even loading of a nano-material having visible light catalytic activity on the surface of the threaded glass fibers by a two-step method; the method has the advantages of simple and convenient operation, easy large-scale production and the like; the obtained Ag-AgBr-TiO2/glass fiber composite material has relatively high visible light catalytic activity.

The invention discloses a simple chemical vapor deposition (CVD) method for synthesizing a g-C3N4 ultra small quantum-dot modified titanium oxide nanotube catalyst. According to the invention, the previously synthesized titanium oxide nanotube array is used as the base, a precursor is firstly placed in a crucible, through adopting the high temperature treatment method, the precursor is enabled to become steam, and deposited in the titanium oxide nanotube, then the precursor is condensed into nucleuses in the titanium oxide nanotube to form g-C3N4 of the quantum dot. Due to the obtained catalyst in the visible light, the material is enabled to have the hydrogen producing performance in the visible light by utilizing the photoelectrocatalysis device. According to the invention, the CVD method is adopted to calcine materials in a muffle furnace to obtain the photocatalyst with visible-light response, and the catalyst can show the excellent visible light photocatalytic activity under the effect of photoelectrocatalysis. The catalyst is simple in preparation method, can be produced in large batch, causes no environment pollution during the preparation process, and can be widely applied to the fields of visible regions of the sunlight, solar cells, antibiosis, photocatalysis treatment of pollutants and the like.

The invention provides a binary metal sulfide/carbon nitride composite photocatalytic material and a preparation method thereof. According to the binary metal sulfide/carbon nitride composite photocatalytic material and the preparation method thereof, the binary metal sulfide/carbon nitride composite photocatalytic material is formed by nano sheet-shaped g-C3N4 and a binary metal sulfide nano sheet loaded on the surface of the g-C3N4 nano sheet; and in the composite photocatalytic material, binary metal sulfide accounts for 1%-5% of the mass percent of the g-C3N4. The binary metal sulfide/g-C3N4 composite photocatalytic material has high visible photocatalytic activity and has excellent activity for photocatalytically decomposing water to generate hydrogen by visible light.

The invention relates to a graphene/silver molybdenum oxide compound visible-light catalyst and a preparation method thereof, in particular to a method for preparing the graphene/silver molybdenum oxide-combined visible-light catalyst by water and heat, belonging to the technical field of compound materials and photocatalysis. The preparation method comprises the following steps: taking graphene oxide, silver nitrate and ammonium heptamolybdate as raw materials according to certain proportion, mechanically stirring and mixing the raw materials uniformly in sequence, adjusting the pH value of solution, and then utilizing hydro-thermal reaction to prepare the graphene/silver molybdenum oxide compound visible-light catalyst. The photocatalytic degradation experiment shows that the graphene/silver molybdenum oxide compound visible-light catalyst prepared by the method has a good phtocatalytic degradation effect on rhodamine B due to the irradiation of the visible light and is ideal.

The invention discloses a deposition-hydrothermal method for preparing a nano-sized CdxZn<1-x>S photocatalyst with high visible-light photocatalytic activity. The method includes the following steps: 1) adding dropwise a mixed solution of cadmium nitrate and zinc nitrate into a sodium sulfide solution, stirring at a medium rate for 0.5-3 hours, maintaining the temperature at 10-40 DEG C to obtain a nano-sized powdery precursor precipitate; 2) placing the nano-sized powdery precursor precipitate in a reaction vessel, raising the temperate at a rate of 1-5 DEG C/min up to 150-240 DEG C, maintaining the temperature, allowing hydrothermal reactions for 12-24 hours, stopping the hydrothermal reactions, naturally cooling down to room temperature, taking out the reaction products, washing with the deionized water and the anhydrous alcohol for 3-4 times, drying at 50-80 DEG C in a vacuum drying oven to obtain a solid solution of nano-sized CdxZn<1-x>S photocatalyst. The production method is carried out in water phase with easy operation and low cost. The product has uniform distribution of particle size, the forbidden band width and optical properties thereof are controlled by changing components, and the product has high visible-light photocatalytic activity and good prospects in industrial application.

The invention relates to a photocatalysis antibacterial material excited by visible light and an application thereof. The photocatalysis antibacterial material excited by visible light is characterized in that the noble metal of Pd, Pt, Au or Ag or any metal of Cu and Ni is loaded on a Bi2WO6 material in a form of nitrate when Bi2WO6 is generated to form a metal loaded Bi2WO6 material system. The loading content is controlled by adjusting the content of the loaded noble metal or any metal of the Ni and the Cu. The loaded metal content is 0.0025-0.05 M. The visible light photocatalysis antibacterial performance of the Bi2WO6 is greatly improved by combining the synergetic effect between the noble metal or any metal of the Ni and the Cu and a semiconductor and loading the noble metal on the surface of the Bi2WO6, and the illumination 30-min antibacterial rate reaches more than 99.9 percent. The loading process is simple, and the visible light photocatalysis antibacterial material is potential. The limit for increasing an ultraviolet light source when the photocatalysis material is applied in a room or outside the room is overcome, if sunlight is used as a light source, the utilization ratio of the sunlight can be also greatly improved.

The invention discloses a particle electrode for a photocatalytic three-dimensional electrode/electro-Fenton system and a preparation method thereof. The particle electrode is prepared from activated-carbon loaded bimetallic codoping P25. The preparation method comprises the following steps: preprocessing activated carbon to obtain ultrasonic-nitric acid modified activated carbon; preparing bimetallic codoping P25, and then loading the ultrasonic-nitric acid modified activated carbon and the bimetallic codoping P25 to obtain the particle electrode used for the visible-light photocatalytic three-dimensional electrode/electro-Fenton system. The preparation method is simple, and the obtained particle electrode has a visible-light photoelectrocatalytic effect and can rapidly and efficiently degrade organic pollutants. The particle electrode can obtain an obvious visible-light photocatalysis and three-dimensional electrode/electro-Fenton synergetic treatment effect at the visible-light photocatalytic three-dimensional electrode/electro-Fenton system.

The invention relates to a preparation method of a visible light catalyst with a surface plasmon effect and application thereof. The active component of the visible light catalyst is a precious metal Au, and the carrier is one of TiO2, CeO2, Nb2O5, SiO2, Ta2O5, Al2O3 and ZrO2, wherein, Au accounts for 0.2-5% in mass content, and the particle size of Au particle is 2-20nm. Preparation of the catalyst consists of two steps: the first step is to prepare a carrier; the second step is to prepare an Au/TiO2 (CeO2, SiO2, Al2O3, Nb2O5, Ta2O5, ZrO2) visible light catalyst with a plasmon effect througha sol precipitation method. Au nanoparticles prepared by the method of the invention have good dispersibility, easily controllable size, high active component utilization rate, as well as the effect of high efficiency photocatalytic degradation of organic pollutants by visible light.

The invention belongs to the technical field of a photocatalytic material and relates to a visible-light photocatalytic material and a preparation method thereof. The visible-light photocatalytic material is prepared from bismuth oxychloride and bismuth oxyiodide; and the mol ratio of the bismuth oxychloride is 15-30%. In a synthesis process, the sheet-shaped bismuth oxychloride and bismuth oxyiodide are synthesized by respectively adopting a hydrothermal method and a water bath method, then sufficiently mixing in ethanol according to a ratio, centrifuging, drying, grinding, calcining, cooling and grinding to obtain bismuth oxychloride/bismuth oxyiodide visible-light heterogeneous photocatalytic materials with the different ratios. The method is low in cost and equipment is simple and easy to control. The prepared bismuth oxychloride/bismuth oxyiodide visible-light heterogeneous photocatalytic material has high photon-generated carrier efficiency, greatly improves the light utilization rate and the photocatalytic performance of the material, and represents the good catalytic performance in a process of degrading methyl orange MO.

The invention relates to a preparation method of a ZnFe2O4/ Ag3PO4 composite photocatalyst, belonging to the technical field of environmental material preparation. An ion exchange technique is adopted for the invention, and the preparation method comprises the steps of firstly, feeding FeCl3.6H2O solid and ZnCl2 solid into ethylene glycol, evenly stirring, then feeding sodium acetate (NaAC) and polyethylene glycol (PEG) into the mixture, continuously mixing, and carrying out a reaction to obtain ZnFe2O4 nanospheres; after that, feeding the ZnFe2O4 nanospheres into deionized water, rapidly stirring, dropwise adding a disodium hydrogen phosphate solution, carrying out a reaction, then dropwise adding a silver nitrate solution, stirring until reactants have a full reaction, washing the product, and then carrying out vacuum drying on the washed product to obtain the ZnFe2O4/Ag3PO4 composite photocatalyst. A composite visible light photocatalyst system is established; a heterogeneous structure system is established, so that the activity and the stability of silver phosphate can be improved; furthermore, the photocatalyst can be efficiently recovered by using the ZnFe2O4; the composite photocatalyst has a better degrading effect for the antibiotics in waste water.

The invention relates to a visible light photocatalysed material for air purification and a method for air purification, which belong to the technical field of air purification through photocatalysis. The method is characterized by comprising the following steps: firstly, preparing nanometer photocatalyst powders of copper oxide/bismuth vanadate; secondly, dispersing and loading the photocatalyst powders on a metal mesh and a nylon base material by using silicon or titanium sol; and thirdly, naturally drying the photocatalyst powders or baking the photocatalyst powders at a temperature of between room temperature and 100 DEG C, so as to form a material with excellent visible light catalytic activity to toluene, formaldehyde and other air pollutants. At the same time, the surface of chitosan is modified by the nylon base material to effectively enhance the formaldehyde pollutant adsorption effect of the surface of the material. The visible light photocatalysed material for air purification and the method for the air purification have the advantages that the prepared nanometer photocatalysed material of the copper oxide/bismuth vanadate oxidizes the air pollutants through photocatalysis in daylight or under the normal lighting condition; and the catalyst loading base material does not need the temperature treatment at a temperature of more than 100 DEG C, can endow more indoor decorating materials with novel function of visible light catalytic purification, and has wide application prospect in the field of air pollution purification.

The invention discloses a hydro-thermal synthesis method of a visible light photocatalyst mesoporous Bi2WO6. The hydro-thermal synthesis method comprises the following steps of: dissolving bismuth nitrate into a salpeter solution and stirring so as to obtain a solution A; dissolving sodium tungstate in deionized water and stirring so as to obtain a solution B; dropwisely adding the solution B in the solution A under intense agitation, adding a template agent and stirring so as to obtain a mixing solution, transferring the mixing solution to a reaction kettle an inner container of which is made of polytetrafluoroethylene, and carrying out a 180-degree thermostatic reaction for 24h, so as to obtain white precipitate; and washing for 2-3 times respectively by utilizing deionized water and absolute ethyl alcohol, and carrying out natural air-drying on a product so as to obtain a target object. The hydro-thermal synthesis method provided by the invention has the advantages that the process of the synthesis method is simple, the cost is low, the reaction is mild, the morphology of the product is good, the photocatalytic degradation efficiency is high, and the product is easy to recover, a prepared Bi2WO6 photocatalyst is of a three-dimensional flower shape assembled by nanosheets and has a mesoporous level structure, the Bi2WO6 photocatalyst has high catalytic activity on Rhodamine B, different template agents are adopted so as to have different influences on the degradation and morphology of the product, and the comparison phenomenon is obvious.

The invention discloses a black phosphorus/g-C3N4 composite visible light photocatalytic material. The black phosphorus/g-C3N4 composite visible light photocatalytic material is a product of black phosphorus and g-C3N4 by ball-milling compositing, wherein black phosphorus accounts for 0.5%-50% by weight of g-C3N4. Visible light responding semiconductor black phosphorus is subjected to ball-millingcompositing with g-C3N4 for the first time, and photocatalytic efficiency of g-C3N4 is improved effectively by constructing a heterostructure, so that the prepared black phosphorus/g-C3N4 composite visible light photocatalytic material can be used for degrading organic pollutants, is particularly applicable to degradation of organic photosensitizers and photoinitiators such as rhodamine B and hasgreat application prospect in the field of photocatalytic degradation of organic matter; the black phosphorus/g-C3N4 composite visible light photocatalytic material can be prepared with the ball-milling method, a preparation scheme is simple, and cost is low.