Study On The Preparation And Photocatalytic Activities Of Metal-free Photocatalytic Materials For Reduction Elimination Of UO₂²⁺

The development of nuclear industry promotes tremendous progress of the human society,which meanwhile has produced a large number of nuclear waste（e.g.,hexavalent uranium）.And the nuclear waste would be harmful for human health and ecological environment,and thus how to efficiently remove the waste is the major environmental problems facing the whole world.In this paper,we studied the preparation and photocatalytic performance of boron doped g-C₃N₄ and graphene-like carbon nanocage materials as semiconductor photocatalysts for photocatalytic reduction of UO₂²⁺ contamination.Boron doped g-C₃N₄ photocatalysts were prepared with using boric acid and thiourea as precursor by thermal polymerization.And graphene-like carbon nanocage photocatalysts were designed with using benzene as precursor by chemical vapor deposition method.we studied the doping form and content effect of boron on the g-C₃N₄ visible light absorption,valence and conduction band potential,photoelectron transfer and utilization efficiency.Meanwhile,we also studied the preparation temperature effect on the optical properties,electrical properties and electronic structure of carbon nanocage photocatalysts,the qualitative and quantitative relationship between surface electronic structures of these metal-free photocatalysts,photocatalytic reduction activities of UO₂²⁺,and the photocatalytic mechanism were revealed.The studies will be supply the suggestion and basis to design advanced photocatalysts for photocatalytic removal of UO₂²⁺.