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    Title: Separation of three divalent cations (Cu2 +, Co2 + and Ni2 +) by NF membranes from pHs 3 to 5
    Authors: Nguyen Cong Nguyen;Chen, Shiao-Shing;Hsu, Hung-Te;Li, Chi-Wang
    Contributors: 淡江大學水資源及環境工程學系
    Keywords: Nanofiltration;Divalent cation;Enthalpy of hydration;Pore radius;Concentration polarization
    Date: 2013-11-01
    Issue Date: 2015-01-28 11:08:08 (UTC+8)
    Publisher: Nederland: Elsevier BV
    Abstract: Separation mechanisms for the three model divalent cations with very similar atomic weights (Cu, 63.5 Da; Co, 58.9 Da and Ni, 58.7 Da) by two nanofiltration (NF) membranes (Nitto Denko ESNA and GE Osmonics DK) were studied in a cross flow module from pHs 3 to 5. The results show that the rejection order for the two selected membranes was Ni2 + > Cu2 + > Co2 + from the conducted experiments, and the removal efficiency was increased as pH was decreased for all three metals. It was found that enthalpy of hydration and concentration polarization exerted the controlling effect on the membrane selective transport rather than atomic weight, Stokes radius and hydrated radius. Besides, the counterion of sulfate enhanced the removal efficiencies, but an increase of sulfate more than 0.01 M reduced the removal efficiencies. Moreover, the removal efficiency of DK membrane was better than that of the ESNA membrane due to the positive charge of DK membrane at low pH.
    Relation: Desalination 328, pp.51-57
    DOI: 10.1016/j.desal.2013.08.011
    Appears in Collections:[水資源及環境工程學系暨研究所] 期刊論文

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