Post-doping of ZnO with Cu and Its Effect on Their Photocatalytic Production of Active Oxygen Species

摘要

Cu doping zinc oxides (ZnOs) were prepared by a post doping process with CuCl_2 at high temperature. With the increase of the dopant loading, the lattice constant c decreased firstly and then increased, which indicated that the doped Cu atoms substituted for Zn atoms at lower loading and extra dopant of the Cu atoms existed as interstitial atoms. UV-Vis diffuse reflectance spectra (UV-DRS) illustrated that the energy band gap was effectively narrowed after Cu doping. The photocatalytic production of hydroxyl radical (OH) and superoxide anion (O_2~-) were determined by terephthalic acid with fluorescence spectrophotometer and nitroblue tetrazolium with UV-Vis spectrophotometer respectively, and the results showed that both the photocatalytic production of ?OH and O_2~- were deceased with the increase of the dopant concentration, which indicated that the recombination centers were formed in the samples.