32results about How to "Visible light catalytic activity is good" patented technology

The invention discloses PVC (polyvinyl chloride) wallpaper with a function of photocatalytically degrading formaldehyde in visible light and a method for preparing the PVC wallpaper. The method includes that urea is used as a nitrogen source, tetra-n-butyl titanate is used as a titanium source, and nitrogen-doped titanium dioxide (N-TiO2) photocatalysts are prepared by the aid of sol-gel processes; PVC wallpaper is used as a carrier, the photocatalysts N-TiO2 are carried on the surface of the PVC wallpaper to prepare the photocatalytic wallpaper. The PVC wallpaper and the method have the advantages that TiO2 sol is prepared by the aid of vacuum freeze drying processes, and accordingly the N-TiO2 photocatalysts which are high in photocatalytic activity as compared with like products prepared by the aid of the traditional hot-air drying preparation processes can be obtained, are high in crystallinity and have large specific surface area; formaldehyde gas can be degraded in the visible light by the photocatalytic PVC wallpaper prepared by the aid of the method, and the photocatalytic PVC wallpaper is high in photocatalytic activity.

The invention belongs to the technical field of TiO2 (titanium dioxide) photocatalysis. A preparation method for nitrogen-doped titanium dioxide powder of a reticulated porous structure is characterized by comprising the following steps: (1) extracting a nitrogen source, namely, selecting freshwater mussels at the ages of 2 to 6 years, and sucking covering liquid into a centrifugal pipe by using a pipette; (2) preparing mixed precipitate liquid, namely, weighing 0.5 to 5ml of tetrabutyl titanate in a beaker, measuring the covering liquid according to the volume ratio of the covering liquid to the tetrabutyl titanate equals being (5-10) to1, and dripping the covering liquid into tetrabutyl titanate to obtain the mixed precipitate liquid; (3) carrying out room-temperature mineralization; (4) carrying out hydrothermal synthesis of nitrogen-doped TiO2 powder; and (5) extracting the nitrogen-doped TiO2 powder. The nitrogen-doped TiO2 powder is successfully prepared at a low temperature by taking the covering liquid of living organisms as a biological template and the nitrogen source simultaneously, and adjusting the microstructure and the crystal form of the TiO2. According to the preparation method, the temperature is low, the cost is low, and the operation is easy; the prepared nitrogen-doped TiO2 powder has a bionic microstructure, namely nanoparticles assembled reticulated porous structure, and is large in specific area and high in crystallinity.

The invention relates to a preparation method for an alkali tantalate based composite visible-light photocatalyst in hydrogen production by water splitting, in particular to a method that ammonia is used as the nitrogen source to perform nitrogen doping on the alkali tantalate at high temperature. The method has the following steps: (1) dissolving the tantalum-containing precursor in the surfactant acidic solution to produce a uniform tantalum salt solution; (2) adjusting the PH value to 6-9 and adding the hydroxide of an alkali metal to produce a suspension; (3) water-heating the produced suspension in a reaction kettle to produce the alkali tantalate crystal and (4) treating the crystal with the ammonia to produce the alkali tantalate, and then obtaining the nitrogen doped alkali tantalate. The photocatalyst treats the alkali tantalate by high-temperature ammonolysis, which realizes nitrogen doping to the alkali tantalate. The experiment shows that the alkali tantalate is nitrogen doped in the preparation process which has good visible light catalysis and solves the problem of nitrogen doping to the alkali tantalate.

The invention discloses a g-C3N4 / Al2O3 / ZnO ternary heterojunction material with visible light catalytic activity and a preparation method thereof. The g-C3N4 / Al2O3 / ZnO ternary heterojunction material comprises, by weight 50-70% of g-C3N4, 45-20% of Al2O3 and 5-20% of ZnO. The preparation method of the g-C3N4 / Al2O3 / ZnO ternary heterojunction material comprises: dissolving suitable aluminum nitrate in distilled water, adding prepared g-C3N4 powder, stirring well, dropwise adding NaOH solution until pH is 8-9, stirring, dissolving in zinc nitrate, dropwise adding NaOH solution to maintain pH to 8-9, continuing to stir, filtering by suction, drying, and grinding to obtain a sample precursor, and calcining at 400 DEG C to obtain the g-C3N4 / Al2O3 / ZnO ternary heterojunction material. The preparation method is simple, the raw materials are low in rice, complex equipment is not required, the process is free of pollution, and the material is suitable for industrial batch production.

The invention relates a controllable synthesis method of nonmetallic ion-doped nano titanium dioxide by a phase separation-hydrolysis solvothermal method, in particular to a synthesis method of nonmetallic ion-doped nano titanium dioxide, which solves the problems of low doping efficiency, complicated process, high cost and poor universality of the existing nonmetallic ion doping method of the nano titanium dioxide. The synthesis method comprises the following steps: 1, mixing tetrabutyl titanate with methylbenzene and then stirring to obtain an organic phase; 2, adding nonmetallic ion aqueous solution to a high-pressure reaction kettle, placing the organic phase into a U-shaped groove, placing the groove into the nonmetallic ion aqueous solution, covering, carrying out solvothermal treatment, cooling and filtering; and 3, drying by oil bath and then roasting to obtain the nonmetallic ion-doped nano titanium dioxide. The synthesis method of the invention has simple process, high doping efficiency, low cost and wide applicability; and the obtained nano titanium dioxide has high crystallization degree and good visible light catalytic activity, thus the nano titanium dioxide can be applied to visible light catalytic degradation of organic pollutants.

The invention discloses a preparation method and application of boron hexaoxide. The present invention uses boron powder as a raw material, oxidizes crystalline boron, and utilizes its oxidation exothermic reaction to synthesize boron hexaoxide at low temperature, namely B 6 O. The preparation method of the present invention has low cost, low energy consumption and simple synthesis process, and the obtained boron hexaoxide has strong visible light absorption, and is first applied to photocatalytic decomposition of water to produce hydrogen and photocatalytic reduction of carbon dioxide, all of which show high stability and good performance. Visible light catalytic activity, and itself is a non-metallic photocatalyst, so it can have high scientific significance and application value in the field of new energy development.

The invention provides a visible light photocatalyst Bi12O17Cl2 and a preparation method of the photocatalyst. The preparation method comprises the following steps of: dissolving bismuth nitrate pentahydrate and potassium chloride in water to prepare a mixed solution, wherein the molar ratio of bismuth nitrate pentahydrate to potassium chloride is 1:1; and adjusting the pH value of the mixed solution to 12.5-13, then carrying out hydrothermal treatment at 160-180 DEG C on the solution to obtain a solid product, and washing and drying the solid product to obtain the Bi12O17Cl2 product, which is nano sheets with length of a few hundreds of nanometers and width of a few hundreds of nanometers. Under the irradiation of visible light, the photocatalyst can realize that more than 99.5% and approximate 100% of target pollutant pentachlorophenol is degraded within 45 minutes. The method is simple in synthetic route, easy in whole process control, easy in raw material obtaining, low in cost, and high in yield (up to 90%), and is suitable for industrial large-scale production.

The invention relates to a benzimidazolone H3G / TiO2 compound photo-catalyst with a visible light response function and a preparation method thereof. A visible light absorbing area of the catalyst is 400-600nm. The preparation method comprises the following steps of: adding organic pigment benzimidazolone H3G, TiO2, an accelerator span 80, and N,N-dimethylformamide into an airtight high-pressure kettle; heating and increasing temperature; keeping temperature constant at 180-210 DEG C; after ending loading, cooling to room temperature; filtering, thereby obtaining a light yellow solid; respectively washing the solid with alcohol and water; and placing the obtained light yellow solid into a vacuum drying oven and drying at 100-150 DEG C, and then obtaining a benzimidazolone H3G / TiO2 compound photo-catalytic material. The method for preparing the benzimidazolone H3G / TiO2 photo-catalyst is called as a water thermal loading method in the invention for short. The catalyst provided by the invention has excellent visible light catalytic activity; the degradation speed of pollutant substance is higher than that of TiO2; the chemical and physical stabilities of the prepared catalyst are higher; after the catalyst is used, the catalyst is filtered, washed with distilled water and vacuum-dried for 0.5-1 hour at 100-150 DEG C, and then the catalyst is reusable; and after the catalyst is used for four times, the catalytic activity is not obviously reduced.

The invention discloses a dried persimmon-shaped visible-light-driven photocatalyst BiOBr and a preparation method thereof. The inventor adopts a low-temperature solvothermal method, controls the morphology of a halogen-bismuth-oxide visible-light-driven photocatalyst by controlling the dosage of a bismuth source and a bromine source and adding a structure guiding agent, and successfully prepares the novel efficient visible-light-driven photocatalyst BiOBr with novel and special morphology, the dried persimmon shape, for the first time. The preparation method disclosed by the invention is simple in overall production technology, easy to operate, low in synthesis temperature, high in reaction yield (89%), friendly to environment and low in cost, and accords with the requirements of practical production, and the raw materials are readily available. The visible-light-driven photocatalyst disclosed by the invention has good visible-light catalytic activity, can completely degrade a plurality of organic pollutants (such as methylthionine chloride and methyl orange) within a short period of time under irradiation of visible light, is small in light corrosivity, good in reusability and large in market potential, can be applied to industrial production, and especially has good application value in photocatalytic decomposition of organic pollutants by solar energy.