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“Background The semiconductor-mediated photocatalytic decomposition of organic pollutions in the environment has attracted much attention [1] because of the abundant available solar resources and the minimum requirements of carbon footprint generated. Among the various semiconductor photocatalysts, TiO2 is the most extensively employed photocatalyst, owing to its high photocatalytic activity, good chemical stability, non-toxicity, and low cost. However, TiO2 absorbs only ultraviolet light, which accounts for only 4% of the total sunlight.