AI Jianping , ZHOU Tao , WANG Xiping , CHEN Zhiqin , SHE Yi , JIANG Jiali , CHEN Jiang , LI Wenkui
(Jiangxi Key Laboratory of Surface Engineering, Jiangxi Science and Technology Normal University,
Nanchang 330038, Jiangxi, China )
Abstract: Highly crystalline monodisperse Co-doped ZnO nanostructures were prepared by hydrothermal method using Zn(NO3)2•6H2O,Co(NO3)2•6H2O, NaOH as reactants. The as-prepared samples were well-determined by X-ray diffraction (XRD), scanning electron microscope (SEM), UV-Vis diffuse reflectance spectroscope (DRS) and photoluminescence measurements. The results indicated Co dopant had significant influence on the phase structures and morphologies. And the shape evolution of ZnO nanostructures were also investigated by adjusting the Co dopant. The crystal structures of ZnO are no change with the increasing of Co dopant. However, the intensity of the diffraction peaks becomes weaker and the half peak width becomes wider with the incease of the Co2+ doping concentration. The photocatalytic performance of different Co-doped ZnO samples were studied using an ultraviolet lamp as illumination device and methylorange(MO) as stimulant pollutant. It is found that 2.5% Co-doped ZnO nanoflowers exhibited the best photocatalytic activity (3 h, 89.8%).The mechanism of enhanced photocatalytic activity is also discussed.
Key words: hydrothermal synthesis; ZnO; photocatalytic activity; methyl-orange; fabrication