中文摘要：

本研究构建了VUV-US-O_3三元氧化体系,以水杨酸（SA）为分子探针,采用高效液相色谱和荧光检测器联用测定分析三元氧化体系的·OH产率.结果表明,各氧化体系的氧化能力排序为VUV/US/O_3〉VUV/O_3〉US/O_3〉VUV/US〉O_3〉VUV〉US,120 min内对应的SA去除率分别为96.27%、83.57%、74.80%、68.88%、50.67%、36.06%、8.60%,组合体系显示出了明显的协同效应;VUV/O_3、VUV/US和US/O_3中检测出羟基化产物的最高浓度分别为12.32、7.51、4.47μmol·L~（-1）,较VUV、US、O_3单独氧化产生的羟基化产物浓度（分别为5.22、0.34、3.61μmol·L~（-1））更高,推测各二元氧化体系中的协同效应主要是由·OH产率增加而引起;将US加入VUV/O_3体系中构成VUV/US/O_3三元氧化体系后,可加速O_3溶解并提高·OH最高产率至22.24μmol·L~（-1）,使VUV/US/O_3氧化能力进一步提高.

英文摘要：

A mult-oxidation system（ VUV-US-O_3） was established in this study to investigate the relationship of synergistic effect and free radical production efficiency with salicylic acid（ SA） as the molecule probe. A high performance liquid chromatography（ HPLC） with fluorescence detector was applied to measure the concentration of hydroxylation products（ 2,5-DHBA）. The oxidative capacity of each oxidation systems was as follows： VUV/US/O_3 VUV/O_3 US/O_3 VUV/US O_3 VUV US,with the corresponding SA degradation efficiency of 96. 27%,83. 57%,74. 80%,68. 88%,50. 67%,36. 06% and 8. 60%,respectively. The productive rates of 2,5-DHBA in the combination systems of VUV/O_3,US/O_3 and VUV/US were much higher than that in the individual systems of VUV,US and O_3 oxidation. The results demonstrate that the combination systems had showed synergistic effect clearly,which is mainly attributed to the acceleration of ·OH production. Furthermore,the introduction of US in the VUV/US/O_3 systems could accelerate O_3 dissolution and improved ·OH yield,which leads to an obvious enhancement of oxidative capacity.