HCO_3^-对Co^(2+)催化HSO_5^-降解水中偶氮染料酸性橙7的影响  

Influence of HCO_3^- on the degradation of azo dye Acid Orange 7 by Co^(2+)/ HSO_5^- system

作　　者：杨世迎[1,2] 张君[2] 韩强[2,3] 冯琳玉 蒋保周 肖拓 

机构地区：[1]海洋环境与生态教育部重点实验室,青岛266100 [2]中国海洋大学环境科学与工程学院,青岛266100 [3]清华大学深圳研究生院能源与环境学部,深圳518055

出　　处：《环境化学》2014年第3期500-507,共8页Environmental Chemistry

基　　金：国家自然科学基金(21107101)资助

摘　　要：以典型难生化降解偶氮染料酸性橙7(AO7)为目标污染物,研究了HCO-3(1.7×10-5mol·L-1—1.7×10-1mol·L-1)对痕量Co2+(10μg·L-1)催化过一硫酸氢盐(HSO-5,PMS)氧化降解水中酸性橙7(AO7)的影响,并探讨了其初始反应机理.结果发现,HCO-3可以提高痕量Co2+催化PMS降解AO7的能力,也可以通过直接活化PMS实现对AO7的降解,还可以作为缓冲溶剂维持体系的碱度,通过碱活化PMS间接参与AO7的降解过程.这些效应与[n(HCO-3):n(Co2+)]浓度比直接相关.当[n(HCO-3):n(Co2+)]较小时,Co2+-PMS-HCO-3体系的主要活性物种为SO-·4和1O2,当[n(HCO-3):n(Co2+)]较大时,体系遵循HCO-4氧化降解机理,主要活性物种为1O2.In this work, the effect of HCO3- on trace cobalt-mediated peroxymonosulfate（PMS）oxidation of azo dye Acid Orange 7 （AO7） was investigated. The initial reaction mechanisms were proposed in detail. The results indicated that HCO3- enhanced cobalt-mediated activation of PMS for AO7 degradation, or directly activated PMS to degrade AO7, or was indirectly involved in AO7 decay by base activation of PMS. The initial reaction mechanisms depended on the molar ratio of HCO3- to Co2＋. When the molar ratio of HCO3-/Co2＋ was at low level, the major reactive species were SO4-· and 1O2. When that ratio was higher enough, the reaction system followed a mechanism related to HCO4- generation and the dominating reactive species changed to 1O2.

关 键 词：过一硫酸氢盐 钴 碳酸氢盐 反应机理 废水处理 

分 类 号：X703[环境科学与工程—环境工程]