Nano-sized Ag/ZnO composite was prepared by the sol-gel method combined with temperature-programmed treatment Hie phase structures and morphology of the product were characterized by XRD, nitrogen adsorption/desorpn'on determination, TEM and SEM-EDS. It was found that that silver species existed as metallic Ag° on the surface of ZnO. Ag/ZnO had a typical hexagonal wurtzite structure with a size of less than 10 ran and an average pore diameter of 3.9 nm. To investigate the photocatalytic behavior,the degradation of xylenol orange as a model molecular,was carried out on Ag/ZnO composite under microwave irradiation. The results indicated that Ag/ZnO exhibited enhanced photocatalytic activity under microwave-assisted irradiation,in which the degradation rate for Xylenol orange was over 99% within 80 minutes.%采用溶胶凝胶再结合程序升温溶剂热法制备了纳米复合材料Ag/ZnO,通过X射线衍射(XRD)、N2吸附-脱附、透射电子显微镜(TEM)以及扫描电子显微镜配合X射线能量色散谱仪(SEM-EDS)等测试手段对其结构、形貌等进行了表征.结果表明,复合材料中Ag以单质形式存在且掺杂于ZnO表面,产物具有六方晶系纤锌矿结构,其颗粒尺寸小于10nm,孔径分布均匀,平均孔径约为3.9 nm.为考察上述复合材料的光催化活性,以二甲酚橙为模型分子,在微波场作用下,进行了微波增强光催化降解实验.结果显示,采用微波技术能较大幅度提高复合材料Ag/ZnO对二甲酚橙的降解率,其80min内对二甲酚橙的降解率可达99%以上.
展开▼
