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Application of Insoluble Cellulose Xanthate for the Removal of Heavy Metals from Aqueous Solution
Department of Chemical Engineering and Research Institute for Clean Technology, Myong-Ji University, Yongin-Shi, Kyongki-Do, Korea
Korean Journal of Chemical Engineering, May 1999, 16(3), 298-302(5), 10.1007/BF02707116
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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 processed 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 fur 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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