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Synthesis of amidoxime-containing modified starch and application for the removal of heavy metals

✍ Scribed by B-W. Zhang; K. Fischer; D. Bieniek; A. Kettrup

Publisher
Elsevier Science
Year
1993
Weight
609 KB
Volume
20
Category
Article
ISSN
0923-1137

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✦ Synopsis

Amidoxime-containing modified starch was prepared by reaction of acrylonitrile with crosslinked starch, catalyzed by ceric ions, and subsequent derivatization with free hydroxylamine in methanol. First investigations of this new cation exchange material revealed that the maximum capacities of the modified starch for the heavy metal ions Cu 2+, Hg 2+, Pb 2+ and Zn 2+ were 1.86, 0.59, 0.52 and 0.37 mmol g-1 (dry weight), respectively. At pH 5, the order of decreasing selectivity of the cation exchanger for the various metal ions was: Hg2+> Cu2+> pb2+> Zn2+> Ni2+> Cr 3+. The product could be reused after regeneration with diluted hydrochloric acid.

The high exchange capacity for copper, which offers possibilities for applications of the material for industrial purposes, were examined in detail.

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