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Owing to the excellent photocatalytic activity and superior oxidation ability,TiO2 photocatalyst has been applied in the fields of water purification/sterilization,wastewater treatment and environmental monitoring,since Fujishima and Honda discovered the photocatalytic splitting of water on titania electrodes.A main attraction of the TiO2 photocatalyst is the strong oxidative power of the oxidative species produced under UV illumination,such as photo holes and highly reactive free radicals,that can oxidize most organic compounds,such as organic pollutant in wastewater.Immobilizing TiO2 onto a conducting substrate not only enables the recycling of the catalyst,eliminating the need of the post-separation process,but also suppresses photoelectron/hole recombination by applying a potential bias to improve the photocatalytic efficiency drastically