薄层法研究十二烷基苯磺酸钠对硝基苯/水界面电子转移的影响

高等学校化学学报 ›› 2010, Vol. 31 ›› Issue (4): 756.

薄层法研究十二烷基苯磺酸钠对硝基苯/水界面电子转移的影响

董存武, 李莉, 赵雪萍, 卢小泉, 刘秀辉

西北师范大学化学化工学院, 兰州 730070

收稿日期:2009-08-14 出版日期:2010-04-10 发布日期:2010-04-10
通讯作者: 刘秀辉, 女, 博士, 教授, 主要从事界面电化学与催化研究. E-mail: liuxh@nwnu.edu.cn
基金资助:
国家自然科学基金(批准号: 20875077, 20775060)资助.

Effect of SDBS on Electron Transfer at the NB/H₂O Interface by Thin Layer Method

DONG Cun-Wu, LI Li, ZHAO Xue-Ping, LU Xiao-Quan, LIU Xiu-Hui*

College of Chemistry & Chemical Engineering, Northwest Normal University, Lanzhou 730070, China

Received:2009-08-14 Online:2010-04-10 Published:2010-04-10
Contact: LIU Xiu-Hui. E-mail: liuxh@nwnu.edu.cn
Supported by:
国家自然科学基金(批准号: 20875077, 20775060)资助.

摘要/Abstract

摘要：

用薄层法研究了阴离子表面活性剂十二烷基苯磺酸钠(SDBS)对硝基苯/水界面电子转移的影响. 实验结果表明, 随着水相中十二烷基苯磺酸钠浓度的增加, 有机相中十甲基二茂铁(DMFc)和水相中Fe(CN)₆^3-发生的界面双分子反应的阴极平台电流呈现递减趋势, 但是界面双分子反应速率常数却呈递增趋势. 这是由于阴离子表面活性剂十二烷基苯磺酸钠在硝基苯/水界面形成了修饰层, 影响了界面双电层结构. SDBS在液/液界面的吸附为Langmuir吸附.

关键词: 阴离子表面活性剂; 液/液界面; 电子转移; 薄层法

Abstract:

The effect of an adsorbed anionic surfactant sodium dodecyl benzene sulfonate(SDBS) on electron transfer(ET) reaction between ferricyanide aqueous solution and decamethylferrocene(DMFc) located on the adjacent organic phase was investigated by thin layer method. The experimental results showed that the adsorption of SDBS at the interface resulted in a decay in the cathodic plateau current of bimolecular reaction across immiscible electrolyte solutions(ITIES) between DMFc in the organic phase and Fe(CN)₆^3- in the aqueous phase. However, the rate constant of the electron transfer(k_et) reaction above mentioned increased monotonically as the SDBS concentrations increased from 0 to 200 μmol/L. The reason is caused by formation patches spontaneously of SDBS on the interface and it will then influence the structure of electrical double layer on the interface, and shorten the distance between the redox centers. The surface adsorb of SDBS follow Langmuir isotherm.

Key words: Anionic surfactant; Liquid/liquid interface; Electron transfer; Thin layer method

TrendMD:

董存武, 李莉, 赵雪萍, 卢小泉, 刘秀辉. 薄层法研究十二烷基苯磺酸钠对硝基苯/水界面电子转移的影响. 高等学校化学学报, 2010, 31(4): 756.

DONG Cun-Wu, LI Li, ZHAO Xue-Ping, LU Xiao-Quan, LIU Xiu-Hui*. Effect of SDBS on Electron Transfer at the NB/H₂O Interface by Thin Layer Method. Chem. J. Chinese Universities, 2010, 31(4): 756.

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