阴离子交换膜修饰的水/1,2-二氯乙烷界面上SO_4^(2-)离子的转移反应  

Ion-transfer Reaction of SO_4^(2-) Across the Water /1,2-dichloroethane Interface Modified by an Anion Exchange Membrane

作　　者：王欢欢[1] 胡道盼 江旭恒 张烨桦 陈勇[1] 

机构地区：[1]上海应用技术学院化学与环境工程学院,上海201418

出　　处：《高等学校化学学报》2016年第3期546-551,共6页Chemical Journal of Chinese Universities

基　　金：国家自然科学基金(批准号:21005049);上海市自然科学基金(批准号:14ZR1440900)资助~~

摘　　要：将一种均相季铵型阴离子交换膜用于修饰水/1,2-二氯乙烷(W/DCE)界面,并利用循环伏安法、差分脉冲伏安法和计时电量法考察了该界面上强亲水性阴离子SO_4^(2-)的转移反应过程.研究结果表明,该阴离子交换膜所修饰的W/DCE界面比修饰前具有更宽的电化学窗口,而且在界面上可获得完整的SO_4^(2-)转移的循环伏安曲线和差分脉冲伏安曲线.其中,循环伏安曲线的峰电流与扫速平方根呈线性关系,SO_4^(2-)在膜内水相中的扩散系数为7.6×10-8cm2/s;差分脉冲伏安曲线的峰电流与SO_4^(2-)的浓度在5~25 mmol/L范围内呈线性关系.另外,利用计时电量法测得SO_4^(2-)在该界面上转移反应的标准速率常数为1.49×10-3cm/s.In this work,the anion-transfer reaction of highly hydrophilic sulfate across the water /1,2-dichloroethane（ W / DCE） interface modified by a homogeneous anion exchange membrane（ AEM） was investigated by employing cyclic voltammetry（ CV）,differential pulse voltammetry（ DPV） and chronocoulometry. It was found that the electrochemical window could be extended by the modification of W / DCE interface with such an AEM. In addition,the well-defined CV and DPV curves corresponding to the ion-transfer of highly hydrophilic SO4^2-could be obtained at the modified W / DCE interface. According to the linear relationship between the peak current of CV and the square root of scan rate,as well as the equation of Randles-Sevcik,the diffusion coefficient of SO4^2-in the membrane containing water is calculated to be about 7.6 × 10^-8cm^2/ s. In addition,the peak current of DPV increases linearly with the concentration of SO4^2-within the range of 5—25 mmol / L.Moreover,the standard reaction rate constant of the ion-transfer of SO4^2-at such an AEM-modified W / DCE interface was estimated to be about 1.49×10^-3cm / s via chronocoulometry.

关 键 词：阴离子交换膜 液/液界面 离子转移 硫酸根 

分 类 号：O646[理学—物理化学]