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Theoretical and Experimental Study of Pb 2+ and Hg 2+ Adsorption on Biopolymers, 2. Experimental Part
Author(s) -
Debbaudt Adriana,
Zalba Marta,
Ferreira M. L.,
Gschaider M. E.
Publication year - 2001
Publication title -
macromolecular bioscience
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.924
H-Index - 105
eISSN - 1616-5195
pISSN - 1616-5187
DOI - 10.1002/1616-5195(20010801)1:6<249::aid-mabi249>3.0.co;2-g
Subject(s) - adsorption , chemistry , chitosan , aqueous solution , pectin , biopolymer , pellets , chemical engineering , kinetics , cationic polymerization , thermodynamics , computational chemistry , organic chemistry , polymer , materials science , biochemistry , physics , quantum mechanics , engineering , composite material
Chitosan and pectin were studied as adsorbents for Hg 2+ and Pb 2+ 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.