Abstract
Insoluble cellulose xanthate (ICX), O-alkyl dithiocarbonate of cellulose, was synthesized and used for the removal of heavy metal ions from aqueous solutions. ICX possessed carbon disulfide (CS2) as a functional group, which was obtained by esterification of the hydroxyl group on cellulose polymer matrix with CS2. CS2 could form complexes with divalent transition metal ions, and the resulting ICX-metal complex was water-insoluble and settled easily. The optimum composition for ICX synthesis was cellulose/NaOH/CS2=1: 2: 2.3 in mole base, which showed the highest removal capacity. The selectivity and binding capacity of ICX for heavy metals were in the order of Pb2+> Cd2+> Ni2+ and Cd2+> Pb2+> Ni2+, respectively. More than 90 % of the initial amount of heavy metals was removed within 30 min. The optimum pH was neutral or slightly alkaline, and more than 40 % of initial heavy metals was removed even in the acidic range of pH 2 to 3.
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Kim, HT., Lee, K. Application of insoluble cellulose xanthate for the removal of heavy metals from aqueous solution. Korean J. Chem. Eng. 16, 298–302 (1999). https://doi.org/10.1007/BF02707116
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DOI: https://doi.org/10.1007/BF02707116