Cu²⁺掺杂ZnO纳米材料及其光催化性能研究

The Photocatalxtic Properties of Cu²⁺ Doped ZnO Nano Material

本文采用电化学沉积法制备了系列Cu2+掺杂的纳米ZnO材料,并用两步生长历程解释了材料的形成机制。利用X射线粉末衍射(XRD)、扫描电子显微镜(SEM)、电子探针能谱(EDS)等表征方法对材料物性进行分析,结果表明:Cu2+的掺杂可调控ZnO的形貌和尺寸,并且可以改变其光催化性能。甲基橙光(MO)催化降解测试结果表明,适量浓度的Cu2+掺杂可明显改善ZnO的光催化性能。当制备体系中的Cu2+浓度为1 ×10?4 mmol/L时,Cu2+掺杂的ZnO纳米材料的光电流密度为相同制备条件下所得纯ZnO的3倍。

Cu2+ doped ZnO nano material has been prepared by electrochemical deposition method and the formation mechanism of the material has been explained by two step growth process. The charac-teristics of Cu2+ doped ZnO nano material has been analysed by using the X-ray powder diffraction (XRD), the scanning electron microscope (SEM) and the electron probe energy spectrum (EDS). The results show that the morphology and grain size of ZnO nano material could be regulated by doping Cu2+ and also the photocatalytic performance of ZnO was changed. The results of methyl orange photocatalytic degradation show that the photocatalytic performance of Cu2+ doped ZnO was improved by doping moderate Cu2+ and the photocurrent density of doped ZnO was three times of pure ZnO at the same condition, when the concentration of Cu2+ was 1 ×10?4 mmol/L.