67results about How to "Favorable for photocatalytic reactions" patented technology

The invention relates to a preparation method for forming single-layer high-activity (001) crystal surface dominating titanium dioxide thin films on different substrates, in particular to the method for growing the (001) crystal surface dominating titanium dioxide thin film consisting of single-layer titanium dioxide particles on a metallic titanium or titanium alloy substrate by a wet chemical process, which solves the problems that (001) dominating titanium dioxide powder difficultly forms a (001) plane totally positioned on a surface and that a compact thin film is difficult to form. In the method, the substrate is placed into a reaction kettle containing the aqueous solution of hydrofluoric acid, and heating treatment is performed at 100 to 200 DEG C for 6 to 24 h to obtain the single-layer (001) crystal surface dominating titanium dioxide thin film. The single-layer (001) crystal surface dominating titanium dioxide thin film consists of anatase and rutile in the radio of 95:5 to 80:20, has the thickness of 10 to 1,000 nm, the controllable (001) crystal surface ratio of 20 to 91 percent and high photoelectrochemical decomposition of water, and is expected to be widely and effectively applied to photocatalytic devices.

The invention relates to a method for preparing an acidification stripped vermiculite supported TiO2 photocatalyst. Cheap acidification stripped vermiculite lamina are used as a support, and a TiO2 photocatalyst is supported on the laminar surface of the acidification stripped vermiculite, so that the organic pollutants are treated by integrated adsorption-photocatalysis, and the catalyst is easy to separate and recycle. The simple acid treatment is utilized to obtain the large-specific-area acidification stripped vermiculite lamina containing rich hydroxyl groups on the surface; and the acidification stripped vermiculite supported TiO2 photocatalyst is synthesized by a simple hydrothermal method by using the acidification stripped vermiculite as the support of the TiO2 nano photocatalyst. The method is simple and low in cost; the obtained supported TiO2 photocatalyst is a TiO2 nanoparticle lamina of which the acidification stripped vermiculite laminar surface grows uniformly and orderly and forms a flat porous sponge; and the supported TiO2 photocatalyst has large specific area and high photocatalytic activity, is convenient for treating organic pollutants by integrated adsorption-photocatalysis, is easy to separate and recycle, and can be widely used for environmental treatment, such as purifying treatment of wastewater, sewage, indoor / outdoor gas contamination and the like.

The invention discloses a composite film with photocatalytic oxidability and a preparation method thereof. The preparation method comprises the following steps: preparing titanium dioxide / carbon nanotube powder through glue melting and condensation, and uniformly dispersing the titanium dioxide / carbon nanotube composite material into acetic acid solution of chitosan with the chitosan as a crosslinking agent, wherein the mass ratio of the chitosan and the titanium dioxide / carbon nanotube is 1 to 10, thereby obtaining the catalytic film made of titanium dioxide / carbon nanotube / chitosan material. The composite film prepared in the method is uniform, the preparation method is simple, the raw materials are cheap, and the sources are rich. The defect structure of the surface of the raw carbon nanotube provides growing points for the growth of titanium dioxide grains. In addition, the adsorbed organic substances and intermediates of photodegradation have the function of coordinating with functional groups of the chitosan. The composite catalytic film provided by the invention can be used for photocatalytic oxidation of volatile organic compounds (VOCs) under the visible light irradiationwith the wavelength more than 350nm, and can be used as the air purification agent, the industrial waste water treatment agent and the like.