三元氧化体系中协同效应与羟基自由基产率关系的研究  

Study on the relationship of synergistic effect and free radical production efficiency in a mult-oxidation system

作　　者：洪添 张利华[1] 胡勇有[1] 陈元彩[1] 程建华[1] 陈源波[1] 

机构地区：[1]华南理工大学环境与能源学院工业聚集区污染控制与生态修复教育部重点实验室,广州510006

出　　处：《环境科学学报》2016年第11期3971-3976,共6页Acta Scientiae Circumstantiae

基　　金：国家自然科学基金(No.21277050)~~

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.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.

关 键 词：紫外光 超声 臭氧 水杨酸 羟基自由基 

分 类 号：X703[环境科学与工程—环境工程]