Preparation and photocatalytic performance of Ce doped ZnO nanocomposites
ZnO nanocomposites with different molar ratios of Ce doping were prepared by hydrothermal method using ZnO as a photocatalyst and rare earth element Ce as an additive phase.The effect of Ce doping molar ratio on the lattice structure,microstructure and photocatalytic performance of ZnO nanocomposites was studied u-sing methyl orange(MO)dye as the degradation object.The results showed that the Ce-ZnO nanocomposites prepared were all hexagonal wurtzite structured with an irregular granular appearance.Ce doping increased the surface roughness of ZnO.After Ce doping,no new products were produced in ZnO,which did not affect the structure of ZnO.As the Ce doping molar ratio increased,the specific surface area of Ce ZnO gradually in-creased,the absorption edge first increased and then decreased,the bandgap width first decreased and then in-creased,and the photoluminescence intensity first decreased and then increased.The specific surface area of 0.6％Ce-ZnO reached 33.91 m2/g,with a maximum absorption edge of 394 nm and a minimum bandgap width of 2.97 eV,corresponding to the lowest photoluminescence intensity.The photocatalytic degradation test showed that with the increase of Ce doping molar ratio,the photocatalytic degradation of MO by Ce-ZnO first increased and then decreased.The degradation rate of MO by 0.6％Ce-ZnO reached its maximum value of 95.36％at 180 min.Under strong acidic or alkaline conditions,it wasn't conducive to the progress of photocata-lytic reactions.Under weak acidic conditions with a pH value of 5,the degradation rate of MO by 0.6％Ce-ZnO reached a maximum of 99.16％.When the 0.6％Ce-ZnO photocatalyst was reused for 5 times,the degradation rate of MO still exceeded 70％,indicating good usage stability and economic benefits.
Ce dopingZnOnanocomposite materialsmethyl orangephotocatalysis
万方数据
维普
