Abstract
Graft copolymerisation of acrylamide onto chitosan using ammonium ceric nitrate as an initiator was studied. Then –CONH2 functional groups converted to the –CONHOH moieties by addition of NH2OH·HCl solution for 36 h in base media. Evidence for graft-copolymerisation was obtained by infrared spectroscopy, 1H and 13C-NMR data. Polyhydroxamic acid grafted on chitosan (Chit-g-PHA) was prepared and studied as specific binders for the transition M2+ and M3+ ions. Their architecture is based on aliphatic backbones, as many functional groups in hydroxamate chelating units. One of the most usages of Chit-g-PHA is transition metal complexes. Polyhydroxamic acid grafted on chitosan in pH = 5 coordinated to Cu2+ and Fe3+, in pH = 6, 8 coordinated to Cr2+ and Ni2+ respectively.
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