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Ageing of ion-exchange membranes in oxidant solutions

机译:氧化剂溶液中离子交换膜的老化

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In electrodialysis processes, membranes tend to loose some transport properties after a certain period of utilization. Two ion-exchange membranes, namely a homogeneous anion-exchange membrane (MX) and a heterogeneous cation-exchange membrane (MK-40), were used to investigate the ageing phenomenon and to highlight the characteristic parameters of these membranes which evolve most quickly with ageing. An artificial ageing was carried out under oxidizing conditions (i.e. peracetic acid, and P3 Active Oxonia? solutions) on both membranes. It was found that an increase in conductivity and swelling rate, implying a modification of the polymer chain structure with time, but without a significant deterioration of the functional groups since the exchange capacity remained almost constant.
机译:在电渗析过程中,在使用一段时间后,膜倾向于失去某些运输特性。两种离子交换膜,即均质阴离子交换膜(MX)和异质阳离子交换膜(MK-40),用于研究老化现象并突出这些膜的特征参数,这些参数随着时间的流逝而发展最快。老化。在氧化条件下(即过氧乙酸和P3活性氧氧化溶液)在两张膜上进行人工老化。发现电导率和溶胀速率的增加,暗示了聚合物链结构随时间的变化,但是由于交换容量几乎恒定,因此官能团没有显着的劣化。

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