1625results about How to "Improve photocatalytic efficiency" patented technology

The invention provides a preparation and application method for photocatalysis environmental protection type painting, which relates to construction painting, especially provides a preparation and application method for photocatalysis function painting, which includes steps: mixing titanium-containing organic, water, chelating agent and hydrolysis inhibitor to prepare nano anatase type titanium dioxide water sol; adding metal, oxide or impure titanium dioxide photocatalyst into the titanium dioxide water sol and stirring equably. Using method is coating inorganic isolated layer firstly and coating the photocatalysis painting after drying. Advantages of the invention are: the prepared painting and using technique can be widely used for inner and outer wall surface of building and is harmless to bottom ainting, photocatalysis efficiency is high, cost is low, bonding is firm, transparency is good, preparation is simple, and usage is easy.

The invention relates to an ozone / photocatalysis oxidation-membrane separation integrated method for advanced wastewater treatment. First, an ozone / oxygen gas mixture is dissolved in the wastewater through a gas-liquid mixer to generate high-concentration dissolvable ozone and oxygen; the ozone and oxygen enter into a photocatalytic reactor and produce a large number of strong oxidizing agents such as hydroxyl radicals under the combined action of dual band ultraviolet (185nm + 254nm) radiation and a suspension nano TiO2 catalyst, and the strong oxidizing agents, dissolved oxygen and dissolved ozone cooperatively oxidize and remove removal toxic and harmful substances, odor smell, chroma, virus and bacteria in the water; and a three-phase fluid of wastewater, catalyst and gas passes through a ceramic membrane filter, the wastewater permeating through the ceramic membrane reaches the standard and is discharged, and the concentrated water with suspended catalyst failing to permeating through the ceramic membrane is returned to a backwater bin for further participation in the gas-liquid mixing and ozone / photocatalytic reaction. The process and device involved in the invention have the advantages of high wastewater treatment efficiency, high recovery rate of catalyst, high utilization efficiency of ozone and long service life of membrane.

The invention relates to a silver-modified carbon nitride composite photocatalytic material and a preparation method thereof. The preparation method comprises: dissolving dicyanodiamide or melamine in deionized water or dimethyl sulfoxide and performing ultrasonic dispersing, so as to obtain a dicyanodiamide or melamine dispersion liquid; dissolving silver nitrate in deionized water and stirring uniformly, so as to obtain a silver nitrate solution; slowly dropwise adding the silver nitrate solution into the above dicyanodiamide or melamine dispersion liquid under the condition of magnetic stirring, and continuing stirring the solution, so as to obtain a mixed precursor solution; using anhydrous ethanol and deionized water repeatedly wash the obtained mixed precursor solution for multiple times, and performing vacuum drying; and putting the obtained product in a proper crucible and covering, putting in a high-temperature furnace, and sintering for a period under the condition of nitrogen protection, so as to obtain a powdery sample. The advantages comprise that the raw material source is wide, the preparation technology is simple and practicable, and the cost is relatively low; and the prepared composite photocatalytic material has relatively good photocatalytic degradation effect on organic dye rhodamine B under irradiation of visible light.

The invention discloses a composite material used for catalyzing and degrading nitrogen oxide and its preparation method and application thereof. The invention of the hollow g-C₃N₄ nanospheres/reduced graphene oxide composite-polymer carbonized nanofiber material is prepared as follow: 1) the preparation of silica nanospheres; 2) the preparation of hollow g-C₃N₄ nanospheres; 3) the preparation of graphene oxide; 4) the preparation of surface modified hollow g-C₃N₄ nanoparticles preparation; 5) the preparation of composites; 6) the preparation of composite-polymer carbon nanofiber material. The raw materials used in the process is low cost and easy to get; the operation of the invention is simple and convenient without the use of expensive equipment in the whole process; the composite has high adsorption efficiency of ppb level nitrogen oxide with good repeatability.

The invention relates to an organic wastewater treatment film reactor utilizing solar energy photo-assisted electro-catalysis, which comprises a storage tank of water to be processed, a flow controllable constant flow pump, a photoelectric chemical reactor, a clear water storage tank and a solar battery component, wherein a photo anode and a cathode are correspondingly arranged in the reactor; the photo anode takes a porous metal membrane as a base body, and a TiO2 nano tube or a TiO2 mesoporous membrane is formed on the surface of a porous titanium membrane (net) by an electrochemical anisotropic etching technology; a porous channel film is used as the base body; a metal oxide coating electrode with high electrochemical catalytic activity and high electrical conductivity is prepared by a dipping film-forming method, simultaneously, by doping and modifying operations, the electrode material has photo catalytic activity and the reaction efficiency is improved. The reactor integrates electrochemistry, photocatalysis and film separation technologies; the three technologies are coupled to enhance a synergistic effect; the wastewater treatment efficiency can be improved; a solar component is adopted as a power supply; the clean solar energy is utilized to the maximal degree, and the organic wastewater treatment film reactor has social benefits of reducing environment load and economic benefits of reducing cost.

The invention relates to a preparation method of a titanium dioxide/graphene composite photocatalyst. The invention is to solve the technical problems that titanium dioxide in a titanium dioxide/graphene compound prepared by the traditional method has a large particle size and low photocatalytic efficiency. The preparation method comprises the following steps that: tetrabutyl titanate is added to a graphene oxide dispersion solution, a concentrated acid is added to adjust the acidity after ultrasonic dispersion, and then deionized water is added to continue to carry out ultrasonic treatment to obtain sol; and then the sol is transferred to a hydrothermal reaction kettle to be subjected to hydrothermal reaction, and then is washed and dried to obtain the titanium dioxide/graphene composite photocatalyst. The particle size of the titanium dioxide in the composite photocatalyst provided by the invention is 5 to 10nm, and the composite photocatalyst can be used for visible light catalytic degradation of methyl orange, and the catalytic efficiency can reach 75% within 2 hours. The titanium dioxide/graphene composite material provided by the invention can be used as a photocatalytic material, a solar cell material and a lithium ion battery cathode material.

The present invention discloses a three-phase ultrasonic photo-catalyzed reaction device and a CO₂ reducing method with the device. With the device, a photo-catalyst is placed in a photo-reactor, and the reactor is placed in a water bath of an ultrasonic generator. A light source is arranged above the photo-reactor. The method is that the CO₂ gas to be reduced is mixed evenly with the photo-catalyst and a sodium hydroxide solution in the photo-reactor under the ultrasonic action, and reacts for 3-20 hours with radiation of the light source. Then the CO₂ gas is reduced. The photo-catalyst is made from titanium dioxide or silicon dioxide and metal phthalocyanine. Metal phthalocyanine is supported on the surface of titanium dioxide in the way of in-situ synthesis, sol-gel, and immersion. The present invention promotes the photo-catalysis efficiency, reduces the reaction time, and saves the energy. Visible light can be used for reducing. Moreover, the phot-catalyst can be recycled, which reduces the pollution and the cost, sot the present invention is quite applicable for the three-phase ultrasonic photo-catalyzed reaction device and photo-catalyzed CO₂ reducing.

The invention discloses a coating used for purifying automobile tail gas in tunnels and underground parking lots, which consists of 20-40 parts of silicon acrylic emulsion, 10-30 parts of photocatalytic titanium dioxide nano powder, 5-15 parts by weight negative ion powder, 5-10 parts of ultra-fine diatomite, 10-20 parts of water, 5-15 parts of ordinary titanium dioxide, 4-8 parts of heavy calcium carbonate, 5-10 parts of light calcium carbonate, 1-2 4 parts of propylene glycol, 0.2-0.4 parts of leveling agent, 0.3-0.8 parts of thickener, 0.2-0.4 parts of defoamer, 0.8-1.5 parts of dispersant and 0.3-0.4 parts of wetting agent. The coating of the present invention has added high-efficiency adsorptive diatomite, which can enhance the adsorption of harmful gases and enhance the treatment effect; the adhesion between the coating made of nanoparticles and the substrate is improved; the nano photocatalytic coating of the present invention has The photocatalytic efficiency is high, and it has the effect of releasing negative ions, and can effectively purify the air; the nano photocatalytic coating of the present invention is very convenient for construction, and the thickness of the coating can also be adjusted according to the viscosity of the coating.

The invention belongs to the technical field of functional concrete, and relates to a concrete material having a function of purifying gas-solid pollutants. The concrete material is characterized by being prepared from the components of cement, fine aggregate, coarse aggregate, water, water reducing agent, photocatalyst, an alkali solution and retarder, wherein the cement is 260-530 kg/m<3>, the silica fume content is 0-10 wt% of the cement content, the fly ash content is 0-25 wt% of the cement content, and the slag content is 0-40 wt% of the cement content; the coarse aggregate is 255-850 kg/m<3>, and the sand ratio is 30-45%; the water is 155-220 kg/m<3>; the mixing amount of the water reducing agent accounts for 0.5-1.2% of the total weight of the cement; the photocatalyst is 5-25 g/m<2>; the retarder content accounts for 0.01-1.0% of the weight of the cement to be removed on the surface layer of the concrete; the photocatalyst is put into the alkali solution to prepare a mixture; and the concentration of the photocatalyst is 1-5 g/L. The concrete material prepared by the method has a function of purifying gas-solid pollutants.

The invention discloses an efficient photochemical catalysis air purifier, which consists of a machine box, a filtering device, a fan and a photochemical reacting room. The photochemical reacting room includes a three-dimensional honey comb ceramic halftone which loads a photocatalyst of nano-composite TiO2 and an ultraviolet radiation light which irradiates towards the honey comb ceramic halftone. The photocatalyst is TiO2 adulterated with little iron, lanthanum or cerium hydronium, and the quantity of the added hydronium is 0. 005 percent to 0.5 percent of the total weight. The three-dimensional honeycomb ceramic net of a photocatalyst carrier is a honeycomb ceramic, which is provided with 100 to 600 holes per square inch. The polluted air follows a wind inlet fan to go through the filtering device which consists of a primary filtering net and an active carbon filtering net, and granular articles are removed and volatile organic matters with peculiar smell are absorbed; the gas after primary purifying goes into the photochemical reacting room which is provided with the ultraviolet radiation light, the photocatalyst of nano-composite TiO2 and the three-dimensional honey comb ceramic net, and under an effect of a strong oxidizer which is produced by the reaction of the ultraviolet radiation and the photocatalyst, various organic pollutants in the air can be effectively decomposed.

The invention discloses a preparation method and application of a cadmium sulfide/graphite like carbon nitride (CdS/g-C3N4) composite visible light catalyst. The preparation method of the catalyst is a chemical precipitation method which is performed in an alkaline environment, wherein g-C3N4 is taken as a matrix, and CdCl2 and Na2S are taken as raw materials. The weight ratio of CdS to g-C3N4 in CdS/g-C3N4 is (1:2)-(5:1), and when the composite visible light catalyst is used for visible light catalysis treatment of methylene blue and methyl violet solutions, a better degradation effect can be obtained; and furthermore, the catalyst can still keep higher catalytic activity after being reused for five times. The composite visible light catalyst disclosed by the invention has important significance for development of the visible light catalyst, and also has good application prospects in treatment of dye wastewater.

A heterojunction composite material consisting of one-dimensional In₂O₃ hollow nanotube and two-dimensional ZnFe₂O₄ nanosheets and its application are disclosed. When using this material for catalytic reactions, the hollow cavity and two-dimensional nanosheets of hollow nanomaterials can not only reduce the migration distance to accelerate the electron-hole separation, but also provide a large surface area and rich active sites to promote pollution adsorption and surface catalysis. At the same time, multiple light scattering or reflection in the hollow cavity of the hollow nanomaterials can increase light absorption and utilization. In addition, the heterojunction photocatalyst constructed by growing two-dimensional semiconductor nanosheets on a tubular substrate can promote the effective separation of photogenerated electrons and photogenerated holes, thereby improving the catalytic efficiency. In terms of catalytic performance, In₂O₃ @ ZnFe₂O₄ shows effective degradation of tetracycline, and due to its ferromagnetism, it shows convenient and good separation effect and has good recycling performance.

The invention discloses a loaded multifunctional catalysis composite material, a preparation method thereof and an application of the composite material to catalytic removal of water pollutants. The preparation method includes the steps: preparing a zinc oxide nano-sheet loaded nickel foam (Ni@ZnO) composite material by an electro-deposition method; compounding molybdenum disulfide micro-nano particles on ZnO porous nano-sheets by an electro-deposition method to obtain Ni@ZnO/MoS₂. The composite material Ni@ZnO/MoS₂ combines the advantages of components such as nickel foam, the zinc oxide nano-sheets and molybdenum disulfide from the point of material performances, high catalytic degradation activity and recycled performances are achieved, photo-catalysis and electro-catalysis are combined from the point of material application, and the catalytic activity of the composite material is improved by the aid of synergistic effects of photo-catalysis and electro-catalysis.

A lamp including a reflective portion is utilized in a fluid purification system to maximize the light delivery to a photocatalytic coating that oxidizes gaseous contaminants that adsorb onto the surface to form carbon dioxide, water, and other substances. An ultraviolet light source positioned proximate to the honeycomb activates the titanium dioxide coating. In one example, the reflective portion is a reflective coating. Light directed out of the non-reflective portion of the lamp travels towards the honeycomb and absorbs onto the photocatalytic coating. Light directed towards the reflective portion on the lamp is reflected off the surface of the reflective portion and passes through the non-reflective portion of the lamp to also absorb onto the photocatalytic coating. The reflective portion reflects light towards the honeycomb that would otherwise be misdirected away from the honeycomb, increasing efficiency of the fluid purification system.

The invention discloses a method for preparing a nitrogen doped titanium dioxide visible light catalyst. The process includes the following steps (by weight) : (1) 1% to 15% titanate, 0.5% to 10% hydrolyst and 75% to 95% diluent agent are placed in reactor and react for 5 to 40 hours by irradiation of ultraviolet lamp at 15 to 30 degrees C.; 0.1 to 5% ammonium salt solution is added into reactor to give sol after reacting for 1 to 5 hours; solvent is volatilized and dried for 1 to 3 hours at 50 to 200 degrees C. after titanium sol is obtained. The catalyst has excellent visible light catalytic activity.

A process for preparing the photocatalyst of mesoporous TiO2 powder or film by the sol-gel method includes such steps as preparing solution from n-butyl titanate, low-carbon alcohol and diethanolamine, adding polyethyleen glycol to obtain transparent precursor sol, evaporating solvent out, drying, crushing, and calcining to obtain the photocatalyst. It has high photocatalytic efficiency and activity. The mesoporous powder and film prepared by the said process has vertically open porous structure which benefits the photocatalytic reaction and high activity.

The invention discloses a photoelectrocatalysis water electrolysis method, device and application thereof. Raw water is injected into a water electrolysis reactor separated with a photoanode compartment and a photocathode compartment, and raw water is decomposed into alkalescent water and acid water under the irradiation of light energy at least; wherein the photo anode chamber is internally provided with a photo anode and catalyst selected for anode material, photoproduction electron reduction potential thereof is less than the potential reducing H+ into H2, and photoproduction hole oxidation potential is more than the potential oxidizing OH- into O2, and the photo cathode chamber is internally provided with a photo cathode, and light energy irradiation faces the photo anode. By the water inlet, water outlet and air exhaust respectively arranged, raw water is electrolyzed into alkalescent water and acid water under the irradiation of light energy, compared with the traditional water electrolysis technology, no electric energy is required to be added, no complex control circuit is required, and photoelectrocatalysis efficiency is obviously improved.

The application of the invention discloses a preparation method for {100} crystal plane anatase TiO2 nano-particles. The preparation method comprises the following steps: performing hydration reaction on a titanium source to obtain hydrated TiO2 precipitation, and dispersing the hydrated TiO2 precipitation into an alkaline hydrogen peroxide solution for realizing a hydrothermal reaction so as to obtain the exposed active {100} crystal plane anatase TiO2 nano-particles, wherein the pH value of the alkaline hydrogen peroxide solution is 8-13. By the adoption of the preparation method for the {100} crystal plane anatase TiO2 nano-particles, the exposed active {100} crystal plane anatase TiO2 nano-particles of which particle sizes are less than 15 nanometers can be prepared.

The invention relates to a process for preparing a nanometer titanium dioxide ternary photocatalyst doped with nitrogen and rare earth elements. The process comprises the following steps of respectively preparing an aqueous solution of rare earth salt, an aqueous solution of titanium tetrachloride absolute ethanol and a nitrogen-containing compound solution; dropwise adding the aqueous solution of rare earth salt into a three-necked flask with a mixed solution, uniformly stirring and simultaneously dropwise adding the aqueous solution of titanium tetrachloride absolute ethanol and the nitrogen-containing compound solution, uniformly stirring, adding activated carbon, and further uniformly stirring; and finally aging at room temperature and drying to obtain a solid, grinding the obtained solid and calcining to obtain the nanometer titanium dioxide ternary photocatalyst doped with nitrogen and rare earth elements. The nanometer titanium dioxide ternary photocatalyst doped with nitrogen and rare earth elements, which is prepared by the process, has an efficient photocatalytic degradation effect on pollutants, especially organic pollutants.

The invention discloses a graphene/chitosan/cuprous oxide composite material and a preparation method and applications thereof, which belong to the technical field of visible light catalytic materials. The composite material mainly comprises graphene, chitosan and cuprous oxide, wherein the graphene has extremely good electron capture and transmission performances, and as a carrier of photo-generated electrons, the graphene reduces the recombination rate of photo-generated electrons and holes of the cuprous oxide; by using the excellent adsorption property of the graphene to organic pollutants, the photocatalytic efficiency of a photocatalyst is improved; a good synergistic effect exists among the composited chitosan, the graphene and the cuprous oxide, and while the adsorption effect of the catalyst is improved, the degradation performance of the visible light catalyst to organic pollutants is improved. Under same conditions, compared with cuprous oxide, and cuprous oxide/chitosan, the graphene/chitosan/cuprous oxide composite material shows higher adsorption capacity and photocatalytic properties.

The invention discloses a modified graphite phase carbon nitride photocatalyst as well as a preparation method and application thereof. The modified graphite phase carbon nitride photocatalyst is prepared from urea and salicylic acid serving as raw materials by virtue of calcination, wherein a mass ratio of urea to salicylic acid is 1:(0.002-0.02). The modified graphite phase carbon nitride photocatalyst disclosed by the invention has the advantages of being high in specific surface area, wide in light absorption range, low in electron-hole pair recombination rate, excellent in photocatalyticperformance and the like, and has multiple reactive sites, excellent application value and application prospects. The preparation method has the advantages of being simple in process, wide in raw material source, low in cost, high in preparation efficiency, high in yield and the like, is suitable for large-scale preparation and is favorable for industrial production. The modified graphite phase carbon nitride photocatalyst disclosed by the invention can be used for degrading organic pollutants, has the advantages of being simple in process, convenient to operate, low in cost, high in treatmentefficiency, excellent in degradation effect and the like, and has excellent effects of degrading the various organic pollutants.