膜科学与技术

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Comparisons on test methods of diffusion boundary layer thickness

Authors： ZHANG Wenjuan, MA Jun, WANG Zhiwei, LIU Huiling

Units： (School of Municipal and Environmental Engineering, State Key Laboratory of Urban Water Resource and Environment, Harbin Institute of Technology, Harbin 150090)

KeyWords： ion exchange membrane, linear sweep voltammetry, electrochemical impedance spectroscopy, diffusion boundary layer thickness

ClassificationCode：TQ15

year,volume(issue):pagination： 2017,37(2):12-18

Abstract：

Electrochemical impedance spectroscopy (EIS) and Linear sweep voltammetry (LSV) can be used to measure the thickness of diffusion boundary layers (DBL) in ion exchange membranes. The DBL thickness from these two methods was compared and the effects of flow rate and temperature on the DBL thickness of two ion exchange membranes were investigated. It is found that the DBL thickness measured from LSV was higher than that from EIS, which was due to the higher voltage imposed to the membrane leading to the destruction of membrane interface; when the flow rate increased, the DBL thickness decreased for EIS measurements while did not change significantly for LSV measurements, which indicated that the data from EIS was close to the real value; the DBL thickness was different for anion exchange membrane and cation exchange membrane, and the effect of temperature on them was also different. Research results are of major importance for optimization of characterization techniques on membrane transport properties of ion exchange membranes.

Funds：

尖晶石铁氧体催化过硫酸盐分解水中有机物效能与机理，国家自然科学基金（51378141）；水的深度处理与资源化利用重点实验室课题研究，黑龙江省科学技术厅（PS13H05）

AuthorIntro：

第一作者简介：张文娟（1986-），女，山东泰安人，博士，主要从事方向为膜材料与膜过程及电化学性质的研究，E-mail: wenjuanvivian@126.com. *通讯作者，E-mail: majun@hit.edu.cn

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