4.8 Article

Preparation of poly(1-vinylimidazole)-grafted magnetic nanoparticles and their application for removal of metal ions

Journal

CHEMISTRY OF MATERIALS
Volume 16, Issue 10, Pages 1977-1983

Publisher

AMER CHEMICAL SOC
DOI: 10.1021/cm030334y

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Poly(1-vinylimidazole) with a trimethoxysilyl terminal group (Im(n)) was synthesized by telomerization of I-vinylimidazole. The degree of polymerization (n) was determined by H-1 NMR to be 18. The Im(18) with reactive silane terminal group was grafted directly onto nanosize magnetic particles (maghemite, gamma-Fe2O3) through siloxane bonds to produce polymer-grafted magnetic nanocomposite particles (Mag-Im(18)). The amount of polymer anchored on the particle was estimated by elemental analysis to be 5 wt %. The surface coverage of imidazolyl groups was estimated to be 0.44 mmol g(-1). A stable Mag-Im(18) suspension was prepared, and the polymer coatings were chemically stable over a pH range of 3.5-10.0. The Mag-Im(18) showed a selective binding of divalent metal ions with a binding strength in the order Of Cu2+ much greater than Ni2+ > CO2+. At pH 5.3, the limiting adsorption capacity for Cu2+ ion was 0.11 mmol g-1. Selective separation/recovery of Cu2+ ions from a Cu2+/CO2+ aqueous solution was demonstrated over a pH range of 3-7.

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