Photocatalysis has been regarded as one of the most promising alternative technology for environmental remediation,due to its potential of using sunlight as the energy source.In the past few decades,concrete progress in the photocatalyst design has been achieved by nanostructure engineering,which results in a great number of nanosized photocatalysts with remarkable activity.However,these photocatalysts are mostly in powdery form,which suffer from the difficulties in the recyclability due to the nanosized particles,resulting in secondary environmental pollution and limited their practical applications.