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Sorption equilibrium of Cr(VI) ions by strong base anion exchangers with pyridine structures
Author(s) -
Neagu Violeta,
Untea I.,
Tudorache Elena,
Orbeci Cristina
Publication year - 2004
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.20668
Subject(s) - pyridine , chromate conversion coating , chemistry , substituent , sorption , counterion , alkyl , inorganic chemistry , base (topology) , selectivity , polymer chemistry , ion , organic chemistry , adsorption , chromium , catalysis , mathematical analysis , mathematics
Chromate sorption on pyridine strong base anion exchangers with different functional groups (methyl, ethyl, and butyl groups), at the quaternary nitrogen atoms, was studied as a function of various initial concentrations (100–1500 mg Cr/L) and counterion type. The studied resins in the Cl −[ form have higher Cr(VI)‐retention capacities than those in the SO 4 2−form. The pyridine strong base anion exchangers showed a selectivity reversal for the sulfate and chromate anions compared to that of the commercial resins. The alkyl substituent length of the quaternary nitrogen atoms exerted a substantial influence on the Cr(VI)‐retention capacity values for the resins in the Cl − form; the chromate anions preferred resins with methyl functional groups, that is, resins with a greater hydrophilic structure. For the resins in the SO 4 2−form the length of the substituent at the quaternary nitrogen atom had only a negligible influence on their Cr(VI)‐retention values. © 2004 Wiley Periodicals, Inc. J Appl Polym Sci 93: 1957–1963, 2004