If the question is about TiO2 ...

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If the question is about TiO2 nano-tubes, it has been used in conjunction with UVA to oxidize organic in aqueous solution. for the oxidation. The UV/TiO2 process can oxidize a variety of organics and reduce various metals as long as the background COD is low and the water is noyt contaminated with dissolved iron. The nanotubes oxidative capacity and effectiveness depends on water quality parameters. The background COD competes with target contaminants for the hydroxyl radicals and and iron can deactivate TiO2.