Patent ID: 8034309
Filing Date: 2011-10-11
Classification: B01J,Y10T

Abstract:
1. A method for cleaning air, comprising the steps of: contacting air with the surface of a composite material which is exposed to light; and contacting the surface of the composite material with water, said composite material comprising at least a substrate and a surface layer, said surface layer being hydrophilic and self-cleanable, said surface layer comprising three components comprising: a component (i) comprising a photocatalyst which functions as a catalyst upon exposure to light; a component (ii) comprising at least one metal oxide selected from the group consisting of ZnO, SrO, BaO, MgO, CaO, Rb a component (iii) comprising at least one metal oxide selected from the group consisting of SiO wherein components (i), (ii) and (iii) are all situated within said surface layer which is provided as a single surface layer, such that all of said components are in close proximity to one another within the single surface layer.