中文摘要：

纳米金属氧化物的光化学性质使其成为新的催化剂和杀菌剂,而活性氧化物种（Reactive Oxygen Species,ROS）作为其具有催化杀菌性能的主原因受到广泛关注.本研究通过电子顺磁共振（EPR）自旋捕捉和自旋标记技术,研究了5种纳米金属氧化物（n Al_2O_3、n CuO、n Ti O_2、n Fe_2O_3和n ZnO）在不同光照条件下形成光生电子、羟基自由基（·OH）、超氧阴离子（O_2~-·）和单线态氧（~1O_2）的能力.结果表明,在光照过程中,n Al_2O_3、n CuO、n Ti O_2和n ZnO能够生成·OH和~1O_2,n Fe_2O_3只生成了~1O_2.其中,n Ti O_2生成的光生电子和·OH最多,n CuO仅次于n Ti O_2,n Al_2O_3和n ZnO能够生成·OH,但生成量很少.本实验结果可为预测和评价纳米金属氧化物的光催化性能及环境风险提供一定的理论支持.

英文摘要：

Nano-metal oxides are apotential type of new catalyst and bactericide due to its photocatalytic properties. Attentions have been paid on reactive oxygen species（ ROS） due to its catalytic sterilization. In this study,we compare the capacity of five kinds of nano-metal oxides to generate photogenerated electrons,hydroxyl radicals（ ·OH）,superoxide anion（ O_2~-·） and singlet oxygen（~1O_2） in different light conditions by Electron Paramagnetic Resonance（ EPR） spin trapping and spin labeling technique. During illumination,n Al_2O_3,n CuO,n Ti O_2 and n ZnO are able to generate·OH and~1O_2,while n Fe_2O_3 only generates~1O_2. Generation of photogenerated electrons and ·OH is the highest from n Ti O_2 system,followed by n CuO.n Al_2O_3 and n ZnO can generate ·OH but with a slight amount. The experimental results can provide some theoretical support for predicting the catalytic performance and evaluating the environmental risk of nano-metal oxides.