BiOCl表面掺杂石墨烯用于可见光下高效光催化胺偶联OA

The carbon-doped BiOCl was prepared using glucose as a carbon source.The carbon dopants are mainly concentrated in the surface or shallow lattice of the crystals with partial bonded to oxygen atoms.The conversion of benzylamine for its self-coupling(>99%)is boosted by 12 times over carbon-doped BiOCl that of bare BiOCl under visible light at room temperature using molecular oxygen as a green oxidant.The doped catalyst shows good functional groups toleration of amines and facet-dependent photocatalytic activity.Comprehensive characterizations verify that doping of carbon causes the formation of doping energy level in the original band gap of crystal,which widens the absorption range of BiOCl to visible light and decreases its work function.Meanwhile,the doping of carbon also enhances the electric field in the BiOCl and the most efficient dopant is the single and bilayer graphene which can capture the conduction band electrons that are excited to higher energy levels following the electron-hole separation.This retards the electrons recombination with holes and improves the separation efficiency of photo-generated carriers.Moreover,the O2 activation is enhanced.This work provides a reference for the rational design of photocatalysts and the realization of high-efficiency and directional organic conversion.