Photochemical reactor element containing microcapsulated titanium dioxide photocatalyst

摘要

A photochemical reactor element containing microcapsulated TiO2 photocatalyst particles dispersed in a polysiloxane matrix is disclosed. The polysiloxane matrix has an oxygen gas permeability not less than 1x10-14 mol.m.m-2.s-1.Pa-1. The photochemical reactor element is produced by dispersing the microcapsulated or naked TiO2 photocatalyst particles in a hydrolyzate-polycondensate sol of a trialkoxysilane or a mixture thereof with a tetra- and/or dialkoxysilane and then shaping the dispersion into the element. The naked TiO2 photocatalyst particles in the element are microcapsulated within a porous silica shell layer in situ by irradiating the element with UV radiation.