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    Please use this identifier to cite or link to this item: http://tkuir.lib.tku.edu.tw:8080/dspace/handle/987654321/44662

    Title: Polyelectrolyte enhanced ultrafiltration (PEUF) for the removal of Cd(II): Effects of organic ligands and solution pH
    Authors: 李奇旺;Li, Chi-wang;Cheng, Chia-hsien;Choo, Kwang-ho;Yen, Wei-shuen
    Contributors: 淡江大學水資源及環境工程學系
    Keywords: polyelectrolyte;ultrafiltration;ligands;cadmium;chelate formation
    Date: 2008-06
    Issue Date: 2010-03-26 16:38:08 (UTC+8)
    Publisher: Oxford: Pergamon
    Abstract: This study focused on the effects of pH and organic ligands, namely ethylenediaminetetraacetic acid (EDTA), nitrilotriacetic acid (NTA), and citric acids, on the removal and recovery of Cd(II) in polyclectrolyte enhanced ultrafiltration (PEUF). Polyethylenimine (PEI), which can bind with both positively charged metal ions by coordination bonding and negatively charged ligand-metal complexes by charge attraction, was employed as a chelating polymer. The removal and recovery of Cd species was greatly dependent on the chemistry of organic ligands according to solution pH, particularly being related to the distribution of Cd-ligand complexes at different pH levels. In the presence of EDTA, the dominant Cd species are negatively charged Cd(EDTA)(2-) and CdH(EDTA)(-) over the range of pH levels investigated, interacting with PEI via electrostatic attraction and being less pH dependent. On the other hand, the pH effects of both NTA and citric acid systems are similar to that for the system without organic ligands. This was associated with the fact that free Cd ions were predominant at the acidic pH range in both NTA and citric acid systems. (C) 2008 Elsevier Ltd. All rights reserved.
    Relation: Chemosphere 72(4), pp.630-635
    DOI: 10.1016/j.chemosphere.2008.02.036
    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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