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Pb 2+ binding by polyaspartyl polymers and their application to Pb 2+ removal from glycyrrhizin
Author(s) -
Sun Bo,
Mi ZhenTao,
Ouyang Jie,
An Gang,
Song XiaoKai
Publication year - 2005
Publication title -
journal of applied polymer science
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.575
H-Index - 166
eISSN - 1097-4628
pISSN - 0021-8995
DOI - 10.1002/app.21867
Subject(s) - glycyrrhizin , sorption , freundlich equation , chelation , langmuir , polymer chemistry , acrylic acid , polystyrene , polymer , ion exchange , chemistry , nuclear chemistry , materials science , adsorption , ion , inorganic chemistry , copolymer , organic chemistry , medicine
Polyaspartate is an excellent Pb 2+ ‐binding agent in comparison with some polyaspartamide derivatives with different side chains, in that it possesses a higher Pb 2+ uptake and a lower Pb 2+ equilibrium concentration. Equilibrium sorption data for Pb 2+ on polyaspartate can be well fitted with the Freundlich and Langmuir models. Experimental results show that a crosslinked polyaspartate hydrogel is superior to poly(acrylic acid)‐based resins and polystyrene‐based chelating resins. IR spectra and X‐ray photoelectron spectra reveal that the polyaspartate hydrogel binds Pb 2+ by both an ion‐exchange mechanism and a chelating mechanism. The polyaspartate hydrogel is also an effective agent for the removal of Pb 2+ from glycyrrhizin. © 2005 Wiley Periodicals, Inc. J Appl Polym Sci 97: 2215–2220, 2005