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For recent years, mesoporous TiO2 is widely investigated because of its high photocatalytic activity, non-toxicity, and chemical stability[1,2].Nevertheless, the application of conventional TiO2 is very limited, mainly because the band gap of anatase TiO2 is 3.2 eV,which indicates that it is only active in the UV region, accounting for less than 5％ of the solar energy.Since the report by Asahi et al.