Chem. J. Chinese Universities ›› 2016, Vol. 37 ›› Issue (3): 546.doi: 10.7503/cjcu20150626

• Physical Chemistry • Previous Articles     Next Articles

Ion-transfer Reaction of SO42- Across the Water/1,2-dichloroethane Interface Modified by an Anion Exchange Membrane

WANG Huanhuan, HU Daopan, JIANG Xuheng, ZHANG Yehua, CHEN Yong   

  1. School of Chemical and Environmental Engineering, Shanghai Institute of Technology, Shanghai 201418, China
  • Received:2015-08-07 Revised:2015-12-26 Online:2016-03-10 Published:2015-12-26
  • Supported by:

    Supported by the National Natural Science Foundation of China(No.21005049) and the National Natural Science Foundation of Shanghai, China(No.14ZR1440900).

Abstract:

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 SO42- 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-Sevik, the diffusion coefficient of SO42- in the membrane containing water is calculated to be about 7.6×10-8 cm2/s. In addition, the peak current of DPV increases linearly with the concentration of SO42-within the range of 5-25 mmol/L. Moreover, the standard reaction rate constant of the ion-transfer of SO42- at such an AEM-modified W/DCE interface was estimated to be about 1.49×10-3 cm/s via chronocoulometry.

Key words: Anion exchange membrane, Liquid/liquid interface, Ion transfer, Sulfate

CLC Number: 

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