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  • Synthesis and characterisation of a polyacrylamide-polyacrylic acid copolymer hydrogel for environmental analysis of Cu and Cd

    Author(s)
    Li, W
    Zhao, H
    Teasdale, PR
    John, R
    Zhang, S
    Griffith University Author(s)
    Zhao, Huijun
    John, Richard
    Year published
    2002
    Metadata
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    Abstract
    A polyacrylamide-polyacrylic acid copolymer hydrogel was prepared by the controlled hydrolysis of polyacrylamide in an alkaline solution of 10% sodium hydroxide. The structure and composition of the resulting copolymer hydrogel was approximately two acrylic acid units for every acrylamide unit. The capacity of the copolymer hydrogel to bind various metal ions was tested under a range of uptake conditions, with varying uptake time, pH and ionic strength. Ions such as Cu2+ and Cd2+ were bound more strongly to the copolymer hydrogel than the competing ions of Na+, K+, Ca2+ and Mg2+, particularly at pH>5, largely due to the ...
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    A polyacrylamide-polyacrylic acid copolymer hydrogel was prepared by the controlled hydrolysis of polyacrylamide in an alkaline solution of 10% sodium hydroxide. The structure and composition of the resulting copolymer hydrogel was approximately two acrylic acid units for every acrylamide unit. The capacity of the copolymer hydrogel to bind various metal ions was tested under a range of uptake conditions, with varying uptake time, pH and ionic strength. Ions such as Cu2+ and Cd2+ were bound more strongly to the copolymer hydrogel than the competing ions of Na+, K+, Ca2+ and Mg2+, particularly at pH>5, largely due to the increased acidity of these transition metal ions. Metals bound to the copolymer hydrogel were efficiently (>94%) eluted in 2 M HNO3 solution. The copolymer was found to have a pKa of 4.5 and had an equilibrium swelling ratio of 120 at pH>6 with an ionic strength equivalent to 0.01 M NaCl, and a swelling ratio of 265 at low ionic strengths. This material should be of use for the recovery and separation of Cu2+ and Cd2+ ions, and trace environmental analysis applications such as the diffusive gradients in thin films (DGT) technique.
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    Journal Title
    Reactive & Functional Polymers
    Volume
    52
    Publisher URI
    http://www.elsevier.com/wps/find/journaldescription.cws_home/502694/description#description
    DOI
    https://doi.org/10.1016/S1381-5148(02)00055-X
    Subject
    Macromolecular and materials chemistry
    Chemical engineering
    Materials engineering
    Publication URI
    http://hdl.handle.net/10072/6711
    Collection
    • Journal articles

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