Photocatalyst comprising organic-inorganic hybrid materials, and processes for preparing the same

摘要

An organic-inorganic hybrid material comprises first intermediate layer composed of organic-inorganic hybrid polymer material in which organic polymer component and metal oxide component are covalently bonded to each other; second intermediate layer composed of metal oxide which is obtained by hydrolyzing and polycondensing a metal alkoxide compound; and photo-catalysis layer composed of a metal oxide exhibiting photo-catalysis. An organic-inorganic hybrid material (100) comprises a substrate (101), a first intermediate layer (102), a second intermediate layer (103), and a photo-catalysis layer (104) which are sequentially formed on a surface of the substrate. The first intermediate layer is composed of an organic-inorganic hybrid polymer material in which an organic polymer component and a metal oxide component are covalently bonded to each other, which is obtained by hydrolyzing and polycondensing a solution or a wet gel which comprises an organic polymer having an alkoxymetal group as a functional group or an organic polymer having a functional group reactable with a metal alkoxide compound, and a metal alkoxide compound. The second intermediate layer is composed of a metal oxide which is obtained by hydrolyzing and polycondensing a metal alkoxide compound. The photo-catalysis layer is composed of a metal oxide exhibiting photo-catalysis. An independent claim is also included for preparation of an organic-inorganic hybrid material, comprising: (a) providing a substrate having a surface; (b) applying a solution or a wet gel which comprises an organic polymer having an alkoxymetal group as a functional group or an organic polymer having a functional group reactable with a metal alkoxide compound, and a metal alkoxide compound on the surface of the substrate to form the first intermediate layer; (c) applying a solution or a wet gel which comprises a metal alkoxide compound on the surface of the first intermediate layer to form the second intermediate layer; and (d) forming a photo-catalysis layer which is composed of a material comprising a metal oxide exhibiting photocatalysis on the surface of the second intermediate layer.