高铁酸盐去除水中氯酚类化合物研究  

Degradation of the chlorophenols by ferrate

作　　者：姜成春[1] 李湘中[2] 庞素艳[3] 马军[3] 

机构地区：[1]深圳职业技术学院建筑与环境工程学院,广东深圳518055 [2]香港理工大学土木与结构工程系 [3]哈尔滨工业大学市政与环境工程学院,黑龙江哈尔滨150090

出　　处：《哈尔滨工业大学学报》2006年第3期476-478,共3页Journal of Harbin Institute of Technology

基　　金：国家自然科学基金资助项目(50478049);广东省自然科学基金资助项目(04011215)

摘　　要：以3种氯代酚:4-氯苯酚(CP)、2,4-二氯苯酚(DCP)、2,4,6-三氯苯酚(TCP)为代表性有机物,对比研究了高铁酸盐(FeO42-)对各种有机污染物的去除及影响因素.结果表明,氯酚类化合物的去除直接受溶液pH影响,并且这些有机物去除的最佳pH范围与其pKa具有相关性.对于每种氯酚类化合物,pH<pKa时,高铁酸盐与氯酚类化合物的反应主要受氯酚类化合物离解程度的影响;pH>pKa时,反应主要受高铁酸盐氧化还原电位的影响.随着氯酚类化合物取代氯原子数的增加,其非离解态化合物与高铁酸盐的反应活性增加,而离解态化合物与高铁酸盐反应活性随取代氯原子数的增加而降低.The ferrate oxidation of chlorophenols including 4 - （DCP）, 2,4,6- trichlorophenol （TCP） in aqueous solution was chlorophenol （ CP）, 2,4 - dichlorophenol investigated. It was found that the extent of chlorophenols degradation by potassium ferrate was highly pH dependent. The optimal pH for the three chlorophenols degradation was closely linked to their corresponding pKa. When pH 〈 pKa, the reactions of ferrate and chlorophenols were mainly influenced by the extent of dissociation of chlorophenols ; whereas, when pH 〉 pKa, the reactions were mainly controlled by the redox potential of ferrate. Our results also indicated that the reactivity of the undissociated species of chlorophenols with ferrate increased, and the reactivity of the dissociated species decreased instead, as chlorine substituent atoms in chlorophenol molecules increased.

关 键 词：高铁酸盐 氯酚 氧化 离解 

分 类 号：X506[环境科学与工程—环境工程]