Photocatalytic activity and photoinduced hydrophilicity of brookite-heteropolyacid hybrid films

Abstract

Hybrid films of brookite (TiO2) and 12 tungsto (VI) phosphoric acid (PW12) were prepared via layer-by-layer (LBL) processes on the quartz substrate. The photocatalytic activity and photo-induced hydrophilicity of heat-treated film of brookite two layers (H-TT) and brookite two layers covered with PW12 layer (H-TTP) were compared. The H-TTP film showed better photocatalytic decomposition activity against gaseous IPA, and faster hydrophilic conversion in the early stage. The mechanism on these results was discussed.