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Study on adsorption behavior between Cr(VI) and crosslinked amphoteric starch
Author(s) -
Xu ShiMei,
Zhang ShuFen,
Lu RongWen,
Yang JinZong,
Cui ChangXi
Publication year - 2003
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.12182
Subject(s) - adsorption , cationic polymerization , enthalpy , exothermic reaction , langmuir adsorption model , chemistry , ammonium , starch , polymer chemistry , exothermic process , gibbs free energy , nuclear chemistry , chemical engineering , inorganic chemistry , organic chemistry , thermodynamics , physics , engineering
Crosslinked amphoteric starches (CASs) with quaternary ammonium cationic and carboxymethyl anionic groups were prepared by a hemidry reaction. Their adsorption behavior for Cr(VI) was investigated, and was found to follow the Langmuir isotherm. The adsorption process was found to be dependent on initial pH, concentration of Cr(VI), dose of CAS, and temperature. The adsorption capacity decreased with increasing degree of substitution of anionic groups. The thermodynamic study indicated that the adsorption process was exothermic, and the enthalpy changes (Δ H θ ), the entropy changes (Δ S θ ), and free energy changes (Δ G θ ) for CASs were determined. © 2003 Wiley Periodicals, Inc. J Appl Polym Sci 89: 263–267, 2003