用电化学阻抗谱法研究支撑液膜的不稳定性

Study on the instability of supported liquid membrane by electrochemical impedance spectroscopy

采用电化学阻抗法研究支撑液膜膜液的流失行为,并采用等效电路法分析得到的交流阻抗图谱.结果表明,等效电路Rs(RmCm)Q能够较好表征支撑液膜体系的交流电特性,得到的支撑液膜层的电阻和电容值能反映膜液层的特性,电阻值和电容值的变化能直观地反应膜液流失的行为.因而,该方法能很好地用于支撑液膜不稳定性的研究.

The losing behavior of liquid in supported liquid membranes （SLMs） was studied by electrochemical impedance spectroscopy （EIS） method in this paper. The obtained spectrums were analyzed by equivalent circuit method. Results show that the equivalent circuit of Rs（RmCm）Q can describe the AC characteristic of the SLM system, the resistance and capacity value of the supported membrane layer can reflect the properties of liquid in the SLM and the change of those values can directly indicate the losing behavior of liquid in the SLM. Therefore this method is a good way to study the instability of SLM.