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Due to the increasingly polluted environment and the gradual depletion of fossil fuel reserves,the development of renewable technologies for environmental remediation and energy production is highly desirable [1-2].Photocatalysis is a highly important route to solve the above problems through the application of photocatalysts collecting and storing solar energy into chemical bonds and degrading the toxic agents in air and water.Over the past decades,oxide-based semiconductor photocatalysis has attracted much attention,especially the bismuth-base semiconductor materials with highly efficient visible light photocatalytic activity [3-5].