Copper cation transport and scaling of ionic exchange membranes using electrodialysis under electroconvection conditions

Jih-Hsing Chang, Amanda Ellis, Cheng-Hung Tung, Wen-Chi Huang

    Research output: Contribution to journalArticle

    27 Citations (Scopus)

    Abstract

    Here we report on the removal efficiency of copper cations from model Cu2+ ion wastewater by electrodialysis (ED) under electroconvection conditions. Experiments were conducted on commercial ionic exchange membranes (IEMs). Results are presented on the copper cation transport properties through a cation exchange membrane (CEM) showing that Cu2+ ions can penetrate a copper-saturated CEM and still maintain a stable cation removal efficiency rate. We use field-emission scanning electron microscopy (FE-SEM) and X-ray diffraction (XRD) to analyze the scale formed on the IEMs after ED treatment. XRD results show that the scaling on the IEMs is Cu(OH)2 and/or CuO potentially formed from the reaction of Cu2+ ions with hydrolysis products. In particular, results show that the anion exchange membranes (AEMs) are the most prone to scaling which results in a decrease in the overall ion removal efficiency of the ED system. Under electroconvection conditions, hydrolysis of water causes the formation of H+ and OH- ions which penetrate the IEMs leading to a lowering of the pH in both the treated and concentrated model Cu2+ ion wastewater. Finally we show that a stronger field is necessary to drive ion transport through the CEM due to scaling and that transport is heterogeneous in comparison to that of a CEM with no scaling.

    Original languageEnglish
    Pages (from-to)56-62
    Number of pages7
    JournalJournal of Membrane Science
    Volume361
    Issue number1-2
    DOIs
    Publication statusPublished - Sep 2010

    Keywords

    • Copper wastewater
    • Electroconvection
    • Electrodialysis
    • Ion exchange membrane

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