化工学报Issue(11)：4452-4459,8.DOI:10.11949/j.issn.0438-1157.20150031
6种二氯酚电催化还原脱氯：表观动力学过程比较
Electrochemically reductive dechlorination of six dichlorophenol isomers:comparison of apparent kinetics
摘要
Abstract
Chlorophenols are persistent organic pollutants with high toxicity. Dichlorophenols (DCPs) include six isomers due to differentsubstituted position of chlorine atoms. Self-made Pd/polypyrrole(sodium dodecylbenzene sulfonate)/Ti electrode(Pd/PPy(SDBS)/Ti electrode) was employed to dechlorinate six DCP isomers. The effects of electrolysis current, initial pH and the initial concentration of target pollutant on the dechlorination process of 2,5-DCP were investigated. Under the selected conditions,i.e., applied current of 5 mA, initial pH of 2.5 and temperature of 25℃, dechlorination experiments of 2,3-DCP, 2,5-DCP, 2,4-DCP, 2,6-DCP, 3,4-DCP and 3,5-DCP with the same DCP concentration of 100 mg·L−1 were conducted, respectively. Phenol was the main product and a small amount of monochlorophenol could be detected during the dechlorination of six DCPs. The reaction rate constants of six DCPs were 4.735×10−2min−1, 4.609×10−2min−1, 4.845×10−2min−1, 4.317×10−2min−1, 3.973× 10−2min−1and 3.770×10−2min−1, respectively. It showed that the degradationrates of DCPs were affected by pKa, protonation and pH. The degradation difficulty of six DCPs was 2,4-DCP<2,3-DCP<2,5-DCP<2,6-DCP< 3,4-DCP<3,5-DCP.关键词
氯酚/电化学/催化还原/反应动力学/速率常数Key words
chlorophenols/electrochemistry/catalytic reduction/reaction kinetics/rate constant分类
资源环境引用本文复制引用
赵思思,魏学锋,孙治荣..6种二氯酚电催化还原脱氯：表观动力学过程比较[J].化工学报,2015,(11):4452-4459,8.基金项目
国家自然科学基金项目(51278006,51478014)；北京市属高等学校长城学者培养计划项目(CIT&TCD20130311)。@@@@supported by the National Natural Science Foundation of China (51278006,51478014) and the Importation and Development of High-Caliber Talents Project of Beijing Municipal Institutions (CIT&TCD20130311) （51278006,51478014）
