铁离子对于UV/PMS除污染效果的强化(英文)  

Enhancement of iron on the decontamination by UV/peroxymonosulfate

作　　者：关英红[1] 马军[1,2] 李旭春[1] 方晶云[1] 陈丽玮[1] 刘昱 刘湘莲 

机构地区：[1]哈尔滨工业大学城市水资源与水环境国家重点实验室,哈尔滨150090 [2]哈尔滨工业大学城市水资源开发利用(北方)国家工程研究中心,哈尔滨150090 [3]中国电力工程有限公司工程十三部,北京100048 [4]深圳市利源水务设计咨询有限公司管网设计部,深圳518031

出　　处：《黑龙江大学自然科学学报》2012年第3期395-400,共6页Journal of Natural Science of Heilongjiang University

基　　金：Supported by the 863 High Technical Scheme(2009AA06Z310);the Fund for Creative Research Groups of China(51121062);the National Natural Science Foundation of China(50821002;51108117);SKLUWRE(2010DX10);the Special S&T Projecton Water Treatment and Control of Pollution(2009ZX07424-005;2009 ZX07424-006)

摘　　要：以苯甲酸(BA)为目标物,研究了几种变价过渡金属离子对于UV/PMS去除污染物效果的影响。实验结果表明,Co2+和Mn2+对于BA的去除没有影响;而Fe2+和Fe3+明显地强化了BA的去除。UV/PMS/Fe3+体系中BA降解的假一级速率常数大于相同条件下UV/PMS、UV/Fe3+、Fe3+/PMS三种体系中BA降解的假一级速率常数之和,说明UV/PMS和Fe3+之间存在协同作用。此外,Fe2+强化UV/PMS去除BA的效果好于Fe3+,这是由于Fe2+能够迅速还原PMS产生自由基,同时生成Fe3+。最后,研究了铁离子的两种不同类型络合剂磷酸盐和草酸对UV/PMS/Fe3+去除BA的影响。磷酸盐和草酸均抑制了铁离子对BA去除的强化作用。但是,在草酸存在的条件下,UV/PMS/Fe3+对于BA的去除效果仍好于UV/PMS。因此,在实际应用中,UV/PMS与铁离子的组合可能会提高其对污染物的去除效果。The effects of several valence-variable transient metals on the decontamination by UV/ peroxymonosulfate （ A = 254 nm, UV/PMS） were studied with benzoic acid （BA） as probe. It was found that Co2 ＋ and Mn2＋ showed little effect on the degradation of BA by UV/PMS while Fe2＋ and Fe3＋ en- hanced BA degradation obviously. The synergistic effect between UV/PMS and Fe3＋was confirmed by the results that the pseudo first-order rate constant of BA degradation by UV/PMS/Fe3 ＋ was larger than the sum of that by UV/PMS, UV/Fe3 ＋ , and Fe3 ＋/PMS. Furthermore, the stronger enhancement of Fe2 ＋compared with Fe3＋ was found to be due to its initial immediate reduction of PMS to radicals. Finally, the influences of phosphate and oxalate, complexants of iron, were investigated. Results showed that the enhancement of iron on BA degradation by UV/PMS was inhibited completely by phosphate ion but par- tially by oxalate. However, the degradation efficiency of BA by UV/PMS/Fe3＋ in the presence of oxalate was still higher than that by UV/PMS. The results above indicated that the couple of UV/PMS and iron might be a feasible method to enhance the decontamination efficiency in the application.

关 键 词：硫酸自由基 羟基自由基 紫外 过氧单硫酸盐 铁离子 

分 类 号：O189.1[理学—数学]