PARTICULATE TITANIUM DIOXIDE PHOTOCATALYST, PROCESS FOR PRODUCING THE SAME, AND APPLICATIONS THEREOF

摘要

A particulate titanium dioxide photocatalyst which comprises: fine titanium dioxide particles; a first deposit layer comprising a calcium compound and formed on the surface of the particles; and a second deposit layer which is a porous layer formed on the surface of the fine titanium dioxide particles having the first deposit layer and comprises an insoluble substance which is photocatalytically inactive and has a solubility product in water of 10<-25> or smaller. A composition comprising this particulate titanium dioxide photocatalyst and an organic polymer is used as a molding material, coating material, or the like for producing a molding or structure for environmental purification.