377146 Development and Performance of a Novel Cu2+-Imprinted Membrane By Semi-Interpenetrating Polymer Network Technique for Selective Cu2+ Removal

Thursday, November 20, 2014: 8:30 AM
M302 (Marriott Marquis Atlanta)
Jinsong He, Department of Civil and Environmental Engineering, National university of Singapore, Singapore, Singapore and J. Paul Chen, Department of Civil & Environmental Engineering, National University of Singapore, Singapore, Singapore

Ion-imprinted membrane has received a great attention due to its high selectivity toward the target ions. In this study, a novel Cu2+-imprinted polyvinyl alcohol (PVA)/ polyacrylic acid (PAA) membrane (Cu-IM) was prepared by semi-interpenetrating polymer network technique for selective removal of Cu2+ ions from aqueous solution. Chains of the PAA polymer complexed with the template Cu2+ ions were entrapped in the crosslinked PVA membrane matrix. The chemical structure and morphology of the Cu-IM were analysed by FT-IR and SEM. The batch adsorption studies showed that the adsorption of Cu2+ on Cu-IM was highly pH-dependent and the maximum uptake was reached at pH > 4.5. Based on Langmuir equation, the Cu-IM had a maximum adsorption capacity of 82.18 mg/g for Cu2+, with a much higher affinity toward Cu2+ ions than that of non-imprinted membrane (NIM). Selective adsorption indicated that the Cu-IM exhibited a high selectivity for target Cu2+ ions in comparison with that of NIM, and showed a high selectivity for Cu2+ with respect to Zn2+. Besides, the Cu-IM possessed a high reusability for Cu2+ uptake and could maintain 96 % of the adsorption capacity for Cu2+ after 8 adsorption-desorption cycles. In addition, the filtration studies indicated the Cu-IM could remove Cu2+ ions efficiently, with an effective treatment volume of 1710 bed volumes for initial Cu2+ concentration of 11 mg/L. Finally, the FTIR and XPS analysis demonstrated that carboxyl groups in PAA and hydroxyl groups in PVA play a key role in the adsorption of Cu2+ ions.

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