67results about How to "High photoactivity" patented technology

The invention relates to Bi2WO6 / oxide nanofiber cloth with a multistage heterogeneous structure, a prepration method and an application. The method combines the electrospinning and alcohol-thermal synthesis technology and prepares the Bi2WO6 / TiO2 or Bi2WO6 / ZnO fiber cloth with the multistage heterogeneous structure, Bi2WO6 nanosheets with the side length of 50-200nm and the thickness of 10-40nm are grown on mutually orderly interwoven TiO2 fiber or ZnO fiber with the diameter of 100-500nm in an inclined manner, wherein, the Bi2WO6 nanosheets consist of Bi2WO6 nanoparticles with the dimension of 10-40nm. The Bi2WO6 / TiO2 or ZnO fiber cloth with the multistage heterogeneous structure has the advantages of greater strength, smaller particle size, larger specific surface area and the multistage heterogeneous structure, thereby having important applications in solar cells, photocatalysis, self-cleaning and other aspects.

Belonging to the technical field of chemistry, chemical industry and material science, the invention discloses a preparation method and application of a non-noble metal monoatomic catalyst. The invention adopts cheap raw materials and simple method to prepare the monoatomic catalyst. In essence, under a lighting condition, a metal is anchored on a light absorption carrier in a monatomic state formto generate the monoatomic catalyst. The invention for the first time utilizes a photochemical synthesis route to prepare the transition metal monoatomic catalyst. The monoatomic catalyst synthesizedby method provided by the invention is dispersed on the surface of an optical active substance. Nickel single atom is adopted as the cocatalyst for photocatalytic decomposition of water to hydrogen,the price is low, and the catalytic efficiency is greatly improved. Compared with other types of non-noble metal modified composite photocatalysts, the non-noble metal monoatomic catalyst has higher photocatalytic activity.

Provided is a method for synthesising a substantially size homogenous composition of titanium (IV) oxide (titania) nanoparticles comprising, synthesising a titania inorganic crystalline matrix within a sol gel reaction process under conditions that constrain the growth of the matrix such that a majority of the nanoparticles are of a narrow size distribution in the composition and do not exceed a maximum diameter of around 100 nm. The sol gel reaction process can occur under aqueous conditions, or within an organic polymer matrix under non-aqueous conditions. Aqueous dispersions and pastes comprising the substantially size homogenous composition of titanium (IV) oxide nanoparticles are also provided. The titanium (IV) oxide nanoparticles demonstrate improved photoactivity when exposed to UV irradiation, and can also include visible light absorbing centres such that activity is extended into the visible light range.

The invention provides a thermal insulation composite coating and a preparation method as well as application thereof. The composite coating is used for coating fabrics, has good heat insulation property and is harmless to a human body. The preparation method is simple in technology, low in production cost and suitable for industrial production. The thermal insulation composite coating is applied to the fabrics and can be used for coating the multiple fabrics; and the obtained thermal insulation fabrics are suitable for the fields of outdoor goods, clothing, buildings, military and the like and are applied to occasions needing heat preservation and insulation in large quantities. The composite coating comprises the following components in percentage by weight: 20-30% of alcohol, 5-10% of dioctyl phthalate, 0.6-0.9% of phosphate ester, 15-20% of titaniferous silicate complex, 5-12% of polyacrylic resin and the rest of polyurethane.

The invention relates a Bi2WO6 nano-fiber cloth and a preparation method and an application thereof. The nano-fiber cloth is characterized in that the nano-fiber is prepared from Bi2WO6 nano-fiber with a length of hundreds of microns and a diameter of 30-400nm by electrostatic spinning; wherein, a defined amount of reactants are mixed and stirred according to a stoichiometry ratio, then proper tackifier is added to obtain Bi2WO6 precursor with proper viscosity and charge quantity, and finally Bi2WO6 nano-fiber cloth with controllable size, crystal type and morphology can be obtained through the control of the proportioning of each material in the precursor solution and the conditions of the electrostatic spinning. The Bi2WO6 nano-fiber cloth prepared by the electrostatic spinning used as photocatalyst has high specific area and crystallinity so that the visible light activity of the cloth is high, a certain kind of organic pollutants can be degraded in short time, and meanwhile, the catalyst can be recycled and reused very conveniently so that the problem of practical application of photocatalyst is solved.

Photocatalytic composite materials, namely materials capable of promoting photo-initiated chemical reactions and processes for producing such materials, are provided. The invention further provides processes for producing photocatalytic composite materials which includes a macroporous matrix, the macroporous matrix having a surface grafting of preformed titanium dioxide nanocrystals, wherein the macroporous matrix may be produced by a sol-gel technique from a precursor of the macroporous matrix in the presence of a template-forming polymer and of hydrophobically-functionalized nano-crystalline titanium-dioxide particles.

The invention relates to a preparation method of a BiFeO3 nano particle compounded TiO2 nanotube array electrode material, and belongs to the field of material preparation technologies. The preparation method comprises the following steps: firstly, preparing a TiO2 nanotube array electrode; then, preparing a BiFeO3 precursor; and finally, preparing the BiFeO3 / TiO2 nanotube compound electrode by an ultrasonic impregnation method. The electrode consists of TiO2 nanotube arrays which are ranked neatly in order, and the tube has the length of 400nm around, and has the diameter of 100nm around; BiFeO3 nano particles are uniformly distributed above the TiO2 nanotube as well as around the tube wall, partially permeate into the tube, are regular in morphology, are distinct in profile, and are dispersed uniformly. According to the invention, raw materials are low in price and can be obtained easily; the operation is simple and easy, and is easy to control; the equipment requirement is low, and the preparation method is environmentally friendly; the prepared BiFeO3 / TiO2 nanotube compound electrode can adjust the ultraviolet light catalysis of the TiO2 nanotube to be visible light catalysis.

A granular photocatalytic material in the form of pellets or tablet is produced by compressing a photocatalyst mixture containing photocatalytic particles and a filler in air, a vacuum, or an inert gas at a temperature of 0 to 200.degree. C., a pressure of 500 to 6000 kg / cm.sup.2, and a pressing time of 0.01 to 60 seconds. An alkali slurry is applied on the surface of the granular photocatalytic material. A method of restoring a function of granular photocatalytic material comprises washing the surface of the granular photocatalytic material with the slurry or an alkali solution of sodium hydroxide An apparatus for decomposing and removing toxic organic matter comprises a means of bringing the granular photocatalytic material into contact with the toxic organic matter in a liquid or air, and a means of irradiating the granular photocatalytic material with light having a wavelength of 400 nm or less.

The invention discloses a preparation method of light curing molding potassium-sodium niobate leadless piezoelectric ceramics. The method comprises the following steps that potassium-sodium niobate leadless piezoelectric ceramic powder is modified, and finally activated piezoelectric ceramic fine powder with the excellent performance is obtained; then, the activated ceramic fine powder is mixed with a photo initiator, acrylic resin, a dispersing agent and a defoaming agent through ball milling, and vacuumizing is performed to obtain uniform-dispersed leadless piezoelectric ceramic slurry withproper viscosity and high photo-curing activity; then, the prepared ceramic slurry is subjected to photo-curing molding through a 3D printer, and a ceramic green body is obtained; finally, the ceramicgreen body is subjected to two-step degreasing, sintering, silver coating and polarization to obtain dense flawless potassium-sodium niobate leadless piezoelectric ceramics. The obtained ceramic slurry is uniform in granule dispersion, high in illumination activity, low in viscosity and capable of printing complex components of any shape in the photo-curing process, the sintered sample is high indensity and excellent in electric performance, and the using requirement of a piezoelectric device is met.

A purifying system for multi-phase photocatalysis treatment of waste gases relates to a purifying system for titanium dioxide photocatalysis degradation treatment of the waste gases. The purifying system can be a filling type waste gas purifying system and a spraying type waste gas purifying system and mainly comprises a blower, a waste gas disperser, a reaction chamber, an ultraviolet light tube, a nano titanium dioxide suspension and the like. The purifying system provided by the invention has the advantages as follows: the structure is simple, the use is flexible and convenient, various organic waste gases or reducing waste gases can be treated, and suitability for treatment of various industrial waste gases is achieved; the waste gas treatment is complete, the purifying rate is high, the secondary pollution problem is avoided, and environmental protection is facilitated; and the applicability is high, and the popularization and the application are convenient. The purifying system provided by the invention can be extensively applied to treatment of various industrial waste gases in large, medium-size and small-sized factories and is an ideal purifying system for gas-liquid-solid multi-phase photocatalysis treatment of the waste gases.

The invention discloses a phosphorus-containing compound, and a preparation method and an application thereof, and belongs to the fields of material science and technology and chemistry. The phosphorus-containing compound is prepared from cheap raw materials through the simple method; the method is essentially characterized in that the compound is prepared from metal ions and a phosphorus source under the illumination condition of a photoactive material; and the temperature in the prior art is more than 100 DEG C, and the method in the invention is a normal temperature synthesis process, so the obtained compound has a weak crystallization degree. The phosphorus-containing compound has a high photocatalytic activity as a conventional catalyst and a photocatalytic reaction cocatalyst, and achieves a high hydrogen production rate for a photocatalytic hydrogen production reaction. The method and the phosphorus-containing compound can be used for producing an electrode and producing a battery, so the production cost of the electrode and the battery is reduced, the preparation method is simplified, and the obtained electrode is a non-noble metal catalyst, and has the advantages of low cost, low overpotential, high stability and certain industrial application values.

The invention relates to a chlorin and artesunate compound with photosensitive and sound-sensitive activity as well as a preparation method and an application of the compound and belongs to the technical field of chemical medicines. The chlorin and artesunate compound with photosensitive and sound-sensitive activity has different degrees of inhibition effects on human hepatoma cells Hep G2 in in-vitro anti-tumor activity evaluation. The photoactivity and ultrasonic activity are both higher than that of chlorin e6 and artesunate which are used as positive controls. The compound can be used for preparing a photosensitizer and a sound-sensitive agent in photodynamic therapy and sonodynamic therapy methods for tumor therapy.

The invention discloses water-based UV printing ink used for gravure printing and belongs to the field of printing materials. The water-based UV printing ink used for gravure printing is prepared from the following raw materials in parts by weight: 30-60 parts of waterborne polyurethane resin, 3-5 parts of a photoinitiator, 10-30 parts of pigment, 5-20 parts of filler, 0.05-0.5 part of a defoaming agent, 0.2-3.0 part of a wetting dispersant and 5-30 parts of water. The invention also provides a production technology of the water-based UV printing ink used for gravure printing. The water-based UV printing ink is non-inflammable and unexplosive and does not belong to dangerous chemicals, so that the security in printing, transportation and storage is enhanced; meanwhile, the water-based UV printing ink is not added with a quick-drying auxiliary or ethyl alcohol, zero release is realized, and the printing effect of the water-based UV printing ink can be equivalent to that of alcohol soluble printing ink and solvent type printing ink. The water-based UV printing ink has good adhesion and strong water resistance after being printed, so that the water-based UV printing ink is especially applicable to packaging printing materials for food, drink and medicines.

The invention discloses a light emitting diode, an encapsulation structure thereof, an encapsulation method thereof and a display device. A problem in the prior art is solved that a light emitting diode of current encapsulation structure will filter blue light except for high-energy shot-wave blue light which is harmful to human health, so color range of the light source of the light emitting diode is reduced and display effects are affected. The encapsulation structure comprises a substrate base plate, a blue light emitting diode device formed on the substrate base plate, a protective layer covering the blue light emitting diode device and an encapsulation cover plate which is arranged on a light filtering layer on the protective layer and covers the light filtering layer. The light filtering layer comprises a carrier formed by transparent resin and semiconductor particles which are doped in fluorescence particles used for light excitation in the carrier and are used for filtering the high-energy shot-wave blue light. The fluorescence particles are fluorescence particles coated or modified by silicon dioxide. The semiconductor particles are semiconductor nano-particles coated or modified by silicon dioxide.

The invention belongs to the field of fruit tree sunscald and particularly relates to a sunscreen for fruit trees. The sunscreen for fruit trees is composed of titanium dioxide, ionized calcium, diethyl aminoethyl hexanoate, a chelating agent, a cationic surface active agent, a dispersing agent, a preservative, an antifoaming agent and a thickening agent. The invention also provides a preparationand use method of the sunscreen for fruit trees. The sunscreen for fruit trees is capable of well settling and reducing occurrence of sunscald, convenient to use, capable of decreasing the investmentcost for massive fruit farmers and increasing benefits for the fruit farmers and is invented to avoid the situation that there are no good resolutions to a phenomenon that sunscald easily occurs in fruit planting areas.

The invention, which belongs to the technical field of functional nano materials, provides a preparation method of a bismuth-doped polymerized carbon nitride nano composite material containing carbondefects. The method comprises the following steps: step 1, preparing ultrathin PCN nanosheets; and step 2, preparing a bismuth-doped polymerized carbon nitride (Bi / CV-PCN) nano composite material containing carbon defects. According to the preparation method, 2, 4, 6-triaminopyrimidine is introduced into a CN structure through supramolecular aggregation and ion melt polycondensation to obtain theultrathin PCN nanosheet, the crystallinity of PCN is controlled, and visible light absorption is enhanced. Then, a Bi / CV-PCN nano composite material is synthesized by utilizing a mild and simple one-pot hydrothermal method. Under the synergistic effect of an SPR effect caused by Bi doping and CVs, the photoactivity and the photoelectrochemical stability of the composite material are further improved, and charge separation is accelerated.

A water quality cleaner having nano photo-catalytic antibiotic effect, characterized in that the cleaner comprises a cabinet, a filter chamber, an optical catalyst chamber with ultraviolet lamp chamber, and a ultraviolet lamp with a socket, the cleaner is formed by connecting each device through piping and adapting pieces. The advantages of the invention are strong filterability, bacteria eradication, bacteria reproduction abatement and organics degradation.

The present invention relates to a photocatalyst comprising a core part containing titanium dioxide, and a doped part formed on surfaces of said core part, containing a ruthenium-based dye and a platinum compound, a preparation method thereof, a photoreactor and a photolysis process. In accordance with the present invention, a photocatalyst having excellent light resistance and photosensitivity capable of removing volatile organic compounds even in poor ultraviolet light conditions, and a preparation method thereof is provided, and a photoreactor comprising said photocatalyst and an efficient photolysis process using the same are also provided.

The invention discloses a novel metal complex photosensitizer with broad-spectrum tumor phototherapy activity as well as a preparation method and application of the metal complex photosensitizer. Themetal complex photosensitizer is a complex with a structural formula shown in a formula (I). The photosensitizer has no toxicity to tumor cells or normal cells in the dark, but has very strong growthinhibition capability to the tumor cells under illumination and normal oxygen or anaerobic conditions. The photosensitizer disclosed by the invention is high in singlet oxygen quantum yield, has a very strong catalytic oxidation effect on NADH light, has important significance for researching high-efficiency and low-toxicity anti-tumor drugs, and lays experimental and theoretical foundations for clinically developing novel metal anti-tumor drugs.

The invention discloses a synthesis of carboxylic phenol resin active ester and etherate in the technical field of functional high polymer material preparation. The synthesizing method is got through the reaction of carboxylic phenol resin, etherified reagent and catalyst. The synthesized carboxylic phenol resin active ester and etherate have higher light sensitivity, and can be used to the traditional PS edition, thermal sensitive CTP edition, photosensitive resist, electron beam resists or chemical amplitude resists and the like. Compared with the prior art, the synthesis does not need esterification in advance, carboxylic phenol resin is directly etherified under the function of catalyst, and the invention has high etherified ratio, excellent comprehensive property, excellent stability and convenient storage, and the product yield is solid.

The invention relates to a porous carbon composite titanium dioxide-oxyhalide photocatalyst. According to the photocatalyst, a porous carbon composite titanium dioxide-oxyhalide is prepared by hydrolyzing and depositing an oxyhalide precursor on the surface of titanium dioxide; preparing a porous carbon material precursor (MOF) by adopting an in-situ growth method; and then performing high temperature carbonization to obtain a porous carbon composite titanium dioxide-oxyhalide composite material. The titanium dioxide is calcined at different temperatures, the oxyhalide precursor is one of bismuth oxychloride, bismuth oxyiodide and bismuth oxyfluoride, and the porous carbon material precursor (MOF) is one of a zeolite imidazole framework material and a graphene-like framework material. Thetitanium dioxide-oxyhalide material prepared at 500 DEG C or below is compounded with the MOF carbon material porous carbon, so that the adsorption capacity can be remarkably enhanced, and the formaldehyde conversion efficiency is greatly improved.

A photoinitiator is provided which exhibits excellent photosensitivity, yields colorless products, and is usable in thick layer UV curable coating. A novel chemical compound is also provided which is usable for the photoinitator. Photocurable composition is also provided which has these properties. The photoinitiator consists essentially of a compound having a molecular weight of 1000 or less, and having a chemical structure represented by the following formula (1),wherein R3 and R4 independently denote a specific alkyl group, and R1 and R2 independently denote an electron attracting group or a specific alkyl group, and weight percentage of a chemical structure element represented by the following formula (2),which is expressed in formula (1) based on the total molecular weight of the compound, is 17% to 54% by mass.

The invention relates to hollow porous microspheres coated with titanium dioxide nanoparticles and a preparation method thereof. Styrene, a bifunctional dimethacrylate organic monomer and a photoinitiator are dissolved in a solvent to obtain an electronic injection solution; modified titanium dioxide with two-bonded surface is added in and dispersed well in the electronic injection solution; electrostatic spraying is performed under visible light to obtain the hollow porous microspheres coated with titanium dioxide nanoparticles, composed of the titanium dioxide nanoparticles and crosslinkingspheres coating the surface of the titanium dioxide nanoparticles; the crosslinking spheres are hollow, have porous surface and have crosslinking structure formed by interconnection of polymer molecular chains; the titanium dioxide nanoparticles and the crosslinking spheres are connected via covalent bonds. The hollow porous microspheres coated with titanium dioxide nanoparticles and the preparation method thereof have the advantages that the method is simple, the preparation process is reasonable, and the finally obtained hollow porous microspheres have good delustering effect, can effectively shield medium- and long-wave ultraviolet, have high melting temperature and pyrolytic temperature and have great popularization value.

The invention discloses a method for preparing a photo-anode of a dye-sensitized solar cell. An ordered mesoporous titanium dioxide thin film of a nanometer porous structure is adopted as the photo-anode of the dye-sensitized solar cell. The method comprises the steps of preparing butyl titanate, hydrochloric acid and anhydrous ethanol solution, enabling solution to become colloidal sol, conducting aging treatment, drawing the film, annealing, and preparing the dye-sensitized solar cell. The mesoporous titanium dioxide thin film obtained through the method is provided with even and ordered pore passages, has a high specific surface area and relatively good heat stability, can greatly improve the adsorption rate of dye sensitizer molecules and avoid the agglomeration of the dye sensitizer molecules, and enables the dye sensitizer molecules to show good optical activity. When a substrate covered by the thin film is used as the photo-anode of the dye-sensitized solar cell, the photo-anode can be improved in absorbing sunlight, and the transmission rate of electrons and photoelectric conversion efficiency can be improved, so that the performance of the battery can be improved.

The invention discloses a PDINH (at) TiO2 photocatalyst as well as a preparation method and the application thereof. The photocatalyst is a core-shell flaky nano material and comprises PDINH and TiO2in a mass ratio of 1: (0.25-2), the PDINH is a carrier, and the TiO2 is a nano load. The preparation method comprises the following steps: dispersing TiO2 in concentrated sulfuric acid, and stirring to obtain a mixed solution; adding PDINH into the mixed solution for ultrasonic treatment, slowly adding distilled water into the solution, controlling the temperature and stirring; and finally, centrifuging, washing and drying to obtain the PDINH-coated TiO2 photocatalyst. The preparation method disclosed by the invention is simple and feasible, and the organic-inorganic composite PDINH-coated TiO2 photocatalyst with the nanosheet structure has remarkable photocatalytic dynamic characteristics.

The present invention provides a photo-electrochemical (PEC) cell electrode having a surface portion and a bulk portion composed of the same material, wherein at least one of the bulk portion and the surface portion of the electrode is doped with at least one dopant, and wherein said doping is non-uniform along an axis perpendicular to the surface portion. The non-uniform doping can include different concentrations and / or types of the dopants in the bulk portion and in the surface portion of the electrode. There is further provided a PEC cell comprising said electrode and an electrolyte, wherein the surface portion of the electrode faces the electrolyte.

The invention discloses a method for treating landfill leachate with a composite photocatalysis bio-adsorbent. The method comprises the following steps: adding the omposite photocatalysis bio-adsorbent into the landfill leachate at a dosage of 20g / L-80g / L by wet weight, performing light vibration and adsorption degradation, separating solid and liquid after reaction is completed, and adjusting pH of the filtrate to neutral to accomplish the treatment of the landfill leachate. The method for treating the landfill leachate with the composite photocatalysis bio-adsorbent has the advantages of simple treatment process and adsorption equipment, convenient operation, very low cost, high adsorption volume, high adsorption efficiency, no pollution, very good treatment effect of the landfill leachate. By virtue of the method, the operation cost of the treatment of the landfill leachate can be effectively reduced, and the landfill leachate can be effectively treated. The method can be widely adopted.

A method is provided for manufacturing porous titanium dioxide with uniform pore sizes within several nanometers by means of a template and a titanium precursor. In this method, a cyclodextrin or cyclodextrin derivative is used as a template for forming pores, and the cyclodextrin or then derivative reacts with the titanium precursor in a sulfuric acid solution. The manufacturing method according to the present invention allows the control of pore size and morphology using various kinds of cyclodextrin or cyclodextrin derivatives, supports a facile removal of the cyclodextrin used as the template, and is capable of manufacturing anatase type porous titanium dioxide with excellent photoactivity without a separate sintering process.

The invention discloses a hexacyloyl reductive cercosporin photocatalyst and preparation and application thereof, belonging to the technical field of preparation methods and organic synthesis of catalysts. The preparation method comprises the following steps: adding anhydride into a mixture of cercosporin, a reducing agent and alkali, carrying out stirring at room temperature for 1-3 hours, addinganhydride, continuing reacting for 1-3 hours, and carrying out suction filtration, extraction, concentration and column chromatography purification to obtain the catalyst. The catalyst provided by the invention can catalyze reduction, coupling and other photochemical reactions of halogenated hydrocarbons, and has strong reaction activity and industrialization prospects.

The preparation process of aerogel TiO2 with high photocatalysis activity includes the following steps: dissolving non-titanium alkoxide and titanium source in alcohol-water mixture solution through stirring; adding metered epoxide to obtain translucent lumpy alcohol gel of titanium oxide in minutes; ageing, supercritical drying and roasting to obtain nanometer crystal aerogel TiO2 block or powder with adjustable micro structure and specific surface area greater than 100 sq m / g. Where, the titanium source is titanium tetrachloride, titanium trichloride or titanium sulfate; the epoxide is ethylene oxide, propylene oxide, chloropropylene oxide or butylenes oxide; and the organic alcohol solvent is methanol, ethanol, isopropanol or tert-butyl alcohol. When used in degrading nitrobenzene and other sewage treatment, the aerogel TiO2 has photocatalysis activity as high as three times that of commercial P-25 photocatalyst.