三相电极法及其在液/液界面铬(Ⅵ)离子转移研究中的应用  

Three-phase Electrode and its Application in Studies of Chromium(Ⅵ) Ion Transfer Across the Liquid/liquid Interface

作　　者：邓海强[1] 黄新建[2] 陈慧连[2] 王立世[2] 罗汉金[1] 

机构地区：[1]华南理工大学环境科学与工程学院,广州510006 [2]华南理工大学化学与化工学院,广州510641

出　　处：《化学通报》2010年第8期724-730,共7页Chemistry

基　　金：国家自然科学基金项目(20875033)资助

摘　　要：将含有氧化还原探针的硝基苯溶液滴到边平面热解石墨(EPPG)电极上,然后将该电极插入到电解质水溶液中,从而使硝基苯、石墨表面以及水溶液形成一个三相接界线,即形成了EPPG三相电极。利用循环伏安法对EPPG三相电极法的原理进行了研究,得到了比文献报道更理想的液/液界面离子转移热力学数据。本研究还观察到铬(Ⅵ)离子在水相/硝基苯相界面上的转移反应,并测定了铬(Ⅵ)的离子转移热力学数据;同时还分别利用方波伏安法和傅里叶变换-方波伏安法结合"准可逆最大"现象对铬(Ⅵ)在水相/硝基苯相界面上的离子转移动力学进行了比较研究。A three-phase electrode was fabricated by immersing the edge plane pyrolytic graphite（EPPG） electrode covered with a microfilm of a nitrobenzene solution of decamethylferrocene into aqueous electrolyte solutions.The principle of this EPPG three-phase electrode was investigated by cyclic voltammetry,and the obtained thermodynamic data of anions transfer across the water/nitrobenzene interface are more ideal compared with those from published literature.The transfer of chromium（Ⅵ） ion across the water /nitrobenzene interface was observed and the thermodynamic data of its transfer was determined.At the same time,square-wave voltammetry and Fourier transformed square-wave voltammetry associated with ＂quasireversible maximum＂were comparatively used to study the kinetics of chromium（Ⅵ） transfer across the water /nitrobenzene interface.

关 键 词：EPPG三相电极法 液/液界面 离子转移 铬(Ⅵ) 

分 类 号：O646[理学—物理化学]