4.5 Article

Electrochemical Impedance Spectroscopy of Anion-Exchange Membrane AMX-Sb Fouled by Red Wine Components

期刊

MEMBRANES
卷 11, 期 1, 页码 -

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MDPI
DOI: 10.3390/membranes11010002

关键词

electrochemical impedance spectroscopy; anion-exchange membrane; wine; anthocyanins; fouling; biofouling

资金

  1. Kuban Scientific Foundation [MFI-20.1/130]

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Electrochemical impedance spectroscopy shows potential for assessing capacitance of interphase boundaries and resistance of foulant layers. Different contact conditions lead to variations in water splitting and resistance, with short-term contact affecting water splitting and longer contact causing biofouling to influence electrolysis.
The broad possibilities of electrochemical impedance spectroscopy for assessing the capacitance of interphase boundaries; the resistance and thickness of the foulant layer were shown by the example of AMX-Sb membrane contacted with red wine from one side and 0.02 M sodium chloride solution from the other side. This enabled us to determine to what extent foulants affect the electrical resistance of ion-exchange membranes, the ohmic resistance and the thickness of diffusion layers, the intensity of water splitting, and the electroconvection in under- and over-limiting current modes. It was established that short-term (10 h) contact of the AMX-Sb membrane with wine reduces the water-splitting due to the screening of fixed groups on the membrane surface by wine components. On the contrary, biofouling, which develops upon a longer membrane operation, enhances water splitting, due to the formation of a bipolar structure on the AMX-Sb surface. This bipolar structure is composed of a positively charged surface of anion-exchange membrane and negatively charged outer membranes of microorganisms. Using optical microscopy and microbiological analysis, it was found that more intense biofouling is observed on the AMX-Sb surface, that has not been in contacted with wine.

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