2573 results about "Photo catalytic" patented technology

A tandem cell or photoelectrochemical system for the cleavage of water to hydrogen and oxygen by visible light has two superimposed photocells, both cells being connected electrically. The photoactive material in the top cell is a semiconducting oxide placed in contact with an aqueous solution. This semiconducting oxide absorbs the blue and green part of the solar emission spectrum of a light source or light sources and generates with the energy collected oxygen and protons from water. The not absorbed yellow and red light transmits the top cell and enters a second photocell, the bottom cell, which is mounted, in the direction of the light behind, preferably directly behind the top cell. The bottom cell includes a dye-sensitized mesoporous photovoltaic film. The bottom cell converts the yellow, red and near infrared portion of the sunlight to drive the reduction of the protons, which are produced in the top cell during the photo catalytic water oxidation process, to hydrogen.

The invention belongs to the technical field of a new chemical material, and in particular relates to a high-durability super-hydrophobic self-cleaning coating material and a preparation method thereof. The coating material of the invention is prepared by curing and drying nanoparticles with photo-catalytic activity, a low-surface-free-energy polymer and a cross-linking agent at the room temperature, wherein the low-surface-free-energy polymer consists of one or more of polysiloxane fluoride, dimethyl silicone polymer and polyphenylene methyl siloxane, which contain active groups, such as hydroxyl alkoxy group, carbon-carbon double bond, silanol group, siloxy group, and the like; the cross-linking agent is hydrogen-containing silicone oil or aminosilane; and the mass content of the photo-catalytic nanoparticles in the coating ranges from 10 to 60 percent. The coating is formed into a micro-nanostructure by nanoparticle self-organization; a super-hydrophobic self-cleaning coating with lotus effect is prepared from the coating and a cross-linked filming matrix with low surface energy; the persistence of a lotus-shaped super-hydrophobic characteristic of the coating is realized by using the photo-catalytic decomposition characteristic of an organic pollutant for the nanoparticles; and thus the material is suitable for large-area construction and has high weathering resistance andprominent self-cleaning characteristic.

The invention relates to a preparation method of a noble metal modified titanium dioxide photocatalyst, which refers to a photo-catalytic oxidation-reduction coupling method realized in a photo-catalytic reactor: firstly, TiO2, noble-metal water soluble salt and organism are used for preparing a suspension which is then ultrasonically vibrated after the pH value is regulated to 1-12, put into a photo-catalytic reactor for reaction for 0.5h to 8h at 0 DEG C to 90 DEG C under the irradiation of an ultraviolet source with the power of 8W to 125W or a medium or high-voltage mercury lamp source with the power of 100W to 600W, and then separated, washed and dried to obtain the TiO2 photocatalyst modified by noble metal Ag, or Au, or Pt or Pd, wherein, the content of TiO2 is 90 percent to 99.99 percent, the content of the noble metal is 0.01 percent to 10 percent. The noble metal modified titanium dioxide photocatalyst has high photocatalytic degradation activity and strong surface hydrophobicity and the attached catabolites are easy to clean.

The preparation process of visible light responding photocatalytic film layer features that the core or substrate to be coated is set inside water solution with water soluble inorganic or organic Bi compound and V compound, additive, complexing agent, NaOH, KOH and HNO3 while ultrasonically stirring, and after processing for 1-360 min, the core or substrate with obtained visible light responding photocatalytic bismuth vanadate film layer in the surface is taken out and washed with water or organic solvent. Thus obtained material with loaded bismuth vanadate photocatalyst has powerful sterilizing, deterging and deodorizing functions.

The invention discloses a preparation method of a visible light catalyst. Compared with the prior art, the invention adopts inexpensive, non-toxic and harmless urea as the raw material, with no need for highly toxic raw materials. By controlling the calcination temperature, C3N4 can be prepared, thus being in favor of environment protection. The invention also provides a preparation method of a visible light catalyst, comprising the steps of: preparing C3N4 according to the above process; mixing the obtained C3N4 with a modifier in a solvent for reaction, drying the reaction product, thus obtaining the visible light catalyst. The modifier can be an Fe source compound, a Cu source compound, a Zn source compound, a V source compound, a W source compound, a Pt source compound, an Au source compound or a Pd source compound. The method of the invention employs an immersion method for C3N4 metal ion modification, so that metal ions can adsorb the C3N4 surface, thus inhibiting photoinduced charge recombination. Therefore, the visible light catalyst prepared by the preparation method provided in the invention has a high photo catalytic performance.

The invention relates to the technical field of nanometer materials and photocatalytic degradation of organic pollutants, and in particular relates to a Bi/BiOCl (bismuth oxychloride) composite photocatalyst as well as an in-situ reduction preparation method and application thereof. Bi nano-particles with particle sizes of 5-20nm are uniformly distributed on a BiOCl nanosheet with 100-600nm or a the surface of a BiOCl microsphere being 1-3 microns to obtain the Bi/BiOCl composite photocatalyst; the Bi/BiOCl composite photocatalyst is prepared by gaseous-phase in-situ reduction or liquid-phase in-situ reduction; as Bi nano-particles are formed on a BiOCl substrate in an in-situ manner, the lattice matching degree of interfaces between the Bi and the BiOCl is high and the charge migration is facilitated; the Bi nano-particles have the good dispersibility, are difficult to cause agglomeration, and have the good size and distribution controllability; the Bi nano-particles can be well combined with the BiOCl and are difficult to drop off, the photo catalytic capability of the BiOCl under the existence of ultraviolet light can be improved, the spectral response range is expanded, and the visible photo catalytic capability can be acquired, and the Bi/BiOCl composite photocatalyst can be effectively applied to photocatalytic degradation of organic pollutants in a water body.

The invention discloses a photocatalyst paint, consisting of the following raw materials according to weight percentage: 0.5-1.5 percent of nanometer titanium dioxide, 0.05-0.15 percent of nanometer titanium phosphate, 0.05-0.15 percent of nanometer silicon dioxide, 0.5-1.5 percent of nanometer negative ion powder, 5-15 percent of emulsion used for construction coatings, 0.001-0.004 percent of defoaming agent, 0.001-0.004 percent of coupling agent, 0.001-0.004 percent of dispersant, 0.01-0.04 percent of thickener and the rest of water. The paint can purify air in a rapid, efficient and lasting manner, completely remove interior odor and harmful gases such as formaldehyde, TVOC, benzene, ammonia and the like, and inhibit or kill microorganism; furthermore, the preparation equipment and technology are simple, the production cost is low, the product is harmless and odorless, safe, environment-friendly and applicable to various interior environments such as newly decorated rooms, office places, hotels, stores, and the like.

A composite photocatalyst is provided. The composite photocatalyst includes a nanomotor and a plurality of cocatalysts, the nanomotor comprises a shell formed by porous material, at least one inner core formed by a photocatalyst, and a cavity between the shell and the at least one inner core, the plurality of cocatalysts are located in the cavity. The plurality of cocatalysts are selected from the group consisting of metal nanoparticles, metal oxide nanoparticles, metal sulfide nanoparticles, phosphate nanoparticles, up-conversion material nanoparticles, and any combination thereof. A method for making the composite photocatalyst and application thereof are further provided. The plurality of cocatalysts and the nanomotor forms a photocatalytic synergistic reaction system, improving photo-catalytic activity of the composite photocatalyst.

The invention provides a nanofiber load titanium dioxide photocatalyst and a preparation method thereof, which belong to the technical field of preparation of novel nanometer photocatalyst functional materials. The method comprises the following steps: preparing a homogeneous spinning solution with titanium precursor, a hydrolysis inhibitor, a polymer and an organic solvent; carrying out spinning according to a proper electrostatic spinning process to obtain a nanofiber felt/film; introducing hydroxyl groups into electrospun nanofiber, and immersing the electrospun nanofiber in an aqueous solution containing an ammoniation agent, so that hydrolysis and ammoniation reaction of titanium precursor occurs and produces titanium-ammino complex; and carrying out post treatment processes such as baking and the like to obtain the nanofiber load titanium dioxide photocatalyst. The catalyst has excellent photo-catalytic activity in response to ultraviolet light or visible light, and can effectively improve the bonding reliability of titanium dioxide with nanofiber with the help of the action of nitrogen bond.

The invention discloses a technology for preparing organic fuel through directly converting carbon dioxide by using sunlight and a photothermal catalyst. Sunlight is utilized to supply light and heat for the synthesis and catalytic process of the photothermal catalyst, and the photothermal catalyst can simultaneously absorb and utilize ultraviolet light, visible light and infrared light parts in sunlight, so that a phtothermal catalytic reaction is induced to prepare the organic fuel through reducing carbon dioxide by using hydrogen. The photothermal catalyst comprises the following components: an active component which is a 2-30 nano-scale non-stoichiometric oxide belonging to a VIII-family element in a transition family and a carrier material which is an oxide or carbon material with the specific surface area of 30-1000cm<2>/g, alkaline resistance, high heat conductivity or photocatalytic activity. A steeping and in-situ sintering method or photodepositing and in-situ sintering method is used as a synthesis method so that the energy consumption is low, and the photothermal catalyst has high activity and long service life by using a solar-assisted in-situ sintering technology. The technology for preparing organic fuel through directly converting carbon dioxide by using sunlight and the photothermal catalyst is low in energy consumption in the catalytic process, high in organic fuel production efficiency and stable in catalyst activity.

The invention discloses an oxygen-doped carbon nitride/zinc oxide photo-catalyst as well as a preparation method and application of the oxygen-doped carbon nitride/zinc oxide photo-catalyst. The preparation method comprises the following steps: taking dicyandiamide or melamine as a precursor, calcining to prepare a carbon nitride nanosheet; adding a zinc oxide precursor into absolute ethyl alcohol, then adding dethylenetriamine, carrying out ultrasonic dispersion and subsequently enabling dispersion liquid to be subjected to hydrothermal reaction, so as to obtain zinc oxide nano material; enabling the zinc oxide nano material and the carbon nitride nanosheet to be subjected to ultrasonic dispersion in deionized water, subsequently adding hydrogen peroxide, then carrying out hydrothermal reaction again, and thus obtaining the oxygen-doped carbon nitride/zinc oxide photo-catalyst after the reaction is ended. The oxygen-doped carbon nitride/zinc oxide photo-catalyst adopts low-cost and easily available raw materials; the preparation condition can be easily achieved; the raw materials do not need to be calcined under the condition of high temperature, so that the cost for preparing the oxygen-doped carbon nitride/zinc oxide photo-catalyst is reduced, and the popularization and application of the preparation method are facilitated; meanwhile, the photo-catalyst is low in photo-production electron-cavity compounding efficiency and high in photo-catalytic activity.

The invention discloses a preparation and using method of multiple active porous mineral doped nano-TiO2 composite catalytic anti-bacterial materials, and the preparation and using method belongs to the technical field of new material. The main technical key point of the invention is to combine the anti-bacterial mechanism of the ion modified porous minerals and the photo-catalytic anti-bacterial mechanism of the element doped nano-TiO2 to realize the synergistic anti-bacterial role, the modification of the porous minerals by the metal anti-bacterial ion (one of Ag<+>, Cu<2+>, Zn<2+> and Fe<3+>) and the rare earth ion and the nano-TiO2 doped synchronous composite process technology by the metal anti-bacterial ion and the rare earth ion are realized during the preparation process, thereby obtaining the composite catalytic anti-bacterial composite materials which are characterized by broad-spectrum, long-acting effect and safety, etc. The composite catalytic anti-bacterial products prepared by adopting the method and the technical process have low cost, anti-bacterial and long-acting effects, broad-spectrum and good synergistic anti-bacterial effect, the preparation process of the materials has the advantages of simpleness and strong operationality, and the like, so the preparation and using method can be widely applied in anti-bacterial coating, putty, fabric and other industries.

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 discloses a preparation method and application of a hierarchical pore metal-organic framework loaded heteropolyacid catalyst. The catalyst adopts hydrothermal-extraction method for preparation. The method includes: dissolving an organic ligand, a template agent, a metal salt and Keggin type heteropolyacid in a solvent, conducting hydrothermal synthesis of a crystal product, and thenperforming Soxhlet extraction to obtain a catalyst. The obtained catalyst has a meso-micro hierarchical porous structure, realizes high dispersion of the active component heteropolyacid and ultra-highloading capacity, and at the same time solves the problems of large mass transfer resistance, long diffusion path and small reaction place in microporous materials. The catalyst provided by the invention shows excellent catalytic performance in both photocatalytic degradation of dye wastewater and catalysis of oxidation-extraction desulfurization reaction, the catalysis reaction uses visible light and hydrogen peroxide respectively, the process is clean, environment-friendly and green, and after repeated use, the catalyst still maintains high activity, and has high industrial application value.

The invention relates to two-dimension carbide loaded metal simple substance nano-powder, and a preparation method and an application thereof. The preparation method comprises the following steps: (1) soaking MAX phase ceramic powder in a hydrochloric acid solution in which lithium fluoride is dissolved, stirring, centrifugally separating, washing with deionized water and ethyl alcohol, drying and then acquiring solid powder, namely, two-dimension carbide; (2) dissolving the two-dimension carbide in a metal saline solution and preparing into a mixing solution; (3) adding a reducing agent aqueous solution into the mixing solution while stirring, reacting for 0.5-2h at room temperature, and washing and drying the solid precipitate acquired by centrifuging the turbid liquid after ending the reaction, thereby acquiring the two-dimension carbide loaded metal simple substance nano-powder. According to the invention, the uniform loading of metal simple substance nano-particles on the surface of the two-dimension carbide and between the layers is realized; according to the method, various metal simple substance nano-particles are loaded onto the two-dimension carbide; the prepared two-dimension carbide loaded metal simple substance nano-powder as a photocatalyst has excellent application prospect in the field of treating organic pollutants in sewage.

A porous charcoal adsorbent for cleaning environment is composed of porous charcoal as carrier and zinc oxide nano-particles as active component. Its preparing process includes such steps as reaction between zinc nitrate micro-emulsion and sodium hydroxide to obtain zinc oxide nano-particles, carrying them by porous charcoal and heat treating. Its advantages are high absorptive power and high photo-catalytic and antibacterial activities.

A sol solution containing poly(titanic acid) and a planar heterocyclic ligand is provided. Titanium dioxide (TiO₂) particles are formed by aging the sol solution at a temperature below about 140° C. The particles have metallocene-like Ti-complexes comprising the heterocyclic ligand and can be substantially in the anatase phase. The heterocyclic ligands can be triazole, tetrazole, or thiadiazole. The sol solution may be prepared by aging a precursor solution. The precursor solution may contain the heterocyclic ligands and a precursor for poly(titanic acid). The precursor may be titanium alkoxide or titanium chloride. The sol solution may also contain at least one of an organic acid, a base, and a surfactant. The aged sol solution may form a colloidal dispersion of the TiO₂ particles. A photo-catalytic and transparent film may be formed from the TiO₂ particles by depositing a layer of the colloidal dispersion on a support.

The process of preparing photocatalytic self-cleaning enamel includes the following steps: 1. preparing enamel clinker with enamel material quartz, feldspar, borax, etc, through mixing, smelting in a crucible, water quenching and stoving; 2. mixing enamel clinker with clay, dielectric and deionized water, grinding, sieving and stoving to form the enamel; 3. derusting and degreasing steel plate or iron casting, stoving, coating the enamel, stoving and firing to form enameled plate; and 4. soaking the enameled plate in titania colloid solution, vertically drawing, stoving and sintering to form enameled plate with titania film. The process is simple and low in cost, and the prepared self-cleaning enamel material has excellent photocatalytic performance and high chemical stability.

The present invention relates to a system for treating contaminated ballast water, comprising water inlets and outlets, piping connected to said inlets and outlets, at least one treatment unit connected to said piping, which treatment unit comprises UV radiation means, and catalysts, capable of, during operation, create photo-catalytic reactions in ballast water flowing through said unit, filter means for said ballast water and valve means for controlling the flow through said piping, treatment unit and filter means, characterised in control unit capable of, controlling and monitoring of said system for ensuring that no untreated water leaves the system in an uncontrolled manner.

The invention relates to a method to produce highly dispersed nano-zinc oxide. Zinc source and ammonium salt are mixed according to molar ratio 1:0.5-10 between zinc and ammonium; according to the molar ratio 1:0.5-10 between zinc and ammonia in ammonia water, concentration of which is 10-25 percent, ammonia water is added into the mixture, stirred for 1-10 hours, aged for 1-2 days and filtered; filtrate is steamed under 60 DEG C - 95 DEG C until white precipitate comes out and white precipitate is obtained after filtering; the white precipitate is washed by deionized water until pH value is 6-8, dried under 50 DEG C -110 DEG C, roasted for 1-8 hours under 200 DEG C-800 DEG C to get the nano-zinc oxide. The invention has the advantages of simple production process, mild reaction condition and getting nano-zinc oxide with large specific surface area, good dispersion, non-aggregation and comparatively good photo-catalytic activity.