Chitosan and pectin were studied as adsorbents for Hg2+ and Pb2+ from acidic aqueous solutions. The conditions were selected to analyze the adsorption efficiency of pellets of chitosan–pectin. Kinetics data are reported in this work for conditions under which ppm of contaminants are adsorbed. The ability of these biopolymers to remove Pb and Hg from polluted water was investigated using the unmodified biopolymers and the pellets under identical conditions. Results from Molecular Mechanics calculations (MM2) and semiempirical calculations are discussed together to get more insight into the mechanism of metal retention and the effect of conformational factors on adsorption. Several adsorption sites were considered for the biopolymers and many adsorption mechanisms proposed, taking into account the theoretical and experimental results.
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Debbaudt et al. (2001) studied this question.
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