ZnO的制备及其光催化性能

Preparation of ZnO and Its Photocatalytic Activity

分别采用草酸沉淀法和柠檬酸络合法制备了纤锌矿型ZnO,通过X射线粉末衍射仪、扫描电子显微镜和透射电子显微镜对ZnO的结构和形貌进行了表征,并研究了所制备的ZnO对溶液中甲基橙的光催化降解性能。实验结果表明:草酸沉淀法制备的ZnO为小颗粒堆积而成的空心类柱状体,柠檬酸络合法制备的ZnO为小球形颗粒;草酸沉淀法制备的ZnO比柠檬酸络合法制备的ZnO有更好的光催化性能,光照反应30m in,草酸沉淀法制备的ZnO的甲基橙降解率达94.36%,柠檬酸络合法制备的ZnO的甲基橙降解率达81.75%。

The wurtzite-type ZnO was prepared respectively by oxalate precipitation method and citric acid complex method. The structure and appearance of ZnO were characterized by XRD, SEM and TEM. The photocatalytic activity of the ZnO on the degradation of methyl orange in solution was also studied. The experimental results show that： The ZnO prepared by oxalate precipitation method has a hollow prismatical structure formed by small granule depositing, while the ZnO prepared by citric acid complex method is small spherical granule ; The photocatalytic activity of the ZnO prepared by oxalate precipitation method is better than that by citric acid complex method; When the radiation time is 30 rain, the degradation rates of methyl orange on the ZnO prepared by the two methods are 94.36% and 81.75% respectively.