Co掺杂ZnO材料的发光特性与光催化性能OA

ZnO composite photocatalysts doped with different concentrations of cobalt(Co)were prepared using the microwave hydrothermal synthesis method.Their crystal structure,micromorphology,and luminescence characteris-tics were characterized,and their photocatalytic performance was investigated.The results showed that the Co-doped ZnO samples retained a hexagonal bipyramidal structure.With increasing Co concentration,the crystallinity gradually improved while the crystallite size decreased.This reduction in size increased the specific surface area of the samples,providing more active sites for surface photocatalytic reactions.Furthmore,Co doping induced a blue shift in the ultraviolet emission peak and a red shift in the visible emission peak,while the overall photolumines-cence intensity initially decreased and then increased.These changes not only expanded the light absorption range,but also optimized the separation efficiency of photogenerated charge carriers.Using the degradation of methylene blue(MB)as a model reaction,experiments confirmed that the photocatalytic performance of the Co-ZnO compos-ites was significantly superior to that of pure ZnO.This enhancement is attributed to the suppression of electron-hole pair recombination by Co2+incorporation.Notably,the sample with a Co doping ratio(nCo/nZn)of 4%exhibited the optimal photocatalytic performance,achieving the highest MB degradation rate.