Two chitosan based sorbents for the uptake of metallic cations in acidic solutions were synthesized. Chitosan was reacted with 2-formylbenzene sodium sulfonate and 4-formyl-1,3-benzene sodium disulfonate in the presence of NaCNBH3 to yield N-benzyl mono and disulfonate derivatives of chitosan. NMR spectra confirmed the presence of benzyl sulfonate groups which were subsequently used to determine the degree of substitution. The results of sorption experiments for mono and divalent metals at pH=2 are reported.
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Crini et al. (1997) studied this question.
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