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  

Effect of SDBS on Electron Transfer at the NB/H_2O Interface by Thin Layer Method

作　　者：董存武[1] 李莉[1] 赵雪萍[1] 卢小泉[1] 刘秀辉[1] 

机构地区：[1]西北师范大学化学化工学院,兰州730070

出　　处：《高等学校化学学报》2010年第4期756-760,共5页Chemical Journal of Chinese Universities

基　　金：国家自然科学基金(批准号:20875077;20775060)资助

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)3-6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.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） 36 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 200μmol/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.

关 键 词：阴离子表面活性剂 液/液界面 电子转移 薄层法 

分 类 号：O646[理学—物理化学]