硫酸自由基在水处理中的反应特性  

Response characteristics of sulfate radicals in water treatment

作　　者：刘衡锡[1] 张乃东[1] 朱正江[1] 

机构地区：[1]大连海事大学环境科学与工程学院,大连116026

出　　处：《科学通报》2012年第36期3493-3499,共7页Chinese Science Bulletin

基　　金：国家自然科学基金(51078047);大连市科技计划(2010E14SF150);中央高校基本科研业务经费资助

摘　　要：从反应机理上解释了.OH和SO4.相似的原因,研究了硫酸自由基(SO4.)在水处理中的反应特性,探讨了其夺取有机物中C==C键、苯环上π电子和H能力的强弱.一般情况,SO4.的反应活性次序是:夺非芳香π电子>夺芳香π电子(苯系)>夺α-H>夺非α-H.SO4.降解有机物的效率除与有机物结构有关外,还与所处的介质环境有关,即与周围物质的碰撞几率相关,在水处理中由于SO4.与H2O分子反应的机会最多,一部分SO4.夺取H2O分子中H,生成羟自由基.In this paper,the reaction mechanism for similar products of hydroxyl radicals（.OH） and sulfate radicals（SO4.） were explained,the response properties of sulfate radicals in water treatment was investigated,and the ability of sulfate radicals to capture the π electron on C==C chemical bond,benzene ring and H atom in organic matters was discussed as well.Results show that capturing ability of sulfate radicals is generally ranked as the following：π electron in nonaromatic compounds π electron in aromatic compounds（benzene series） α-H non α-H in compound.The organic matter degradation efficiency of sulfate radicals is related to not only the structure of organic matter,but also to the medium environment,that is,it related to the collision probability of surrounding matter.Hydroxyl radicals are produced when sulfate radicals capture the hydrogen atom of H2O in aqueous reaction due to the most reaction opportunities between sulfate radicals and water molecules.

关 键 词：硫酸自由基 羟自由基 α-H Π电子 

分 类 号：X703[环境科学与工程—环境工程]