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Sorption of chromium oxy‐anions onto cationized ligno‐cellulosic material
Author(s) -
Zghida Haïfa,
Baouab Mohamed Hassen V,
Gauthier Robert
Publication year - 2002
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.11596
Subject(s) - chromate conversion coating , sorption , chromium , freundlich equation , chemistry , potassium chromate , adsorption , potassium dichromate , sawdust , ammonium , inorganic chemistry , aqueous solution , desorption , langmuir , nuclear chemistry , ammonium chloride , organic chemistry
Quaternary ammonium groups were grafted onto ligno‐cellulosic material (cotton, wood sawdust, and maize‐cob flour) to obtain a support able to adsorb oxy‐anions containing chromium atoms (chromate and dichromate). For both anions in aqueous solutions, adsorption proceeded very quickly and reached a limit value dependent on the rate of ammonium grafting; at saturation, the Cr/N + ratio was always close to 1/1 for chromate anions, but two ammonium sites were needed to link a dichromate anion in a stable structure, resulting in the same 1/1 Cr/N + ratio. Tentatives for modeling the adsorption process were performed with the Langmuir, Freundlich, and Jossen equations. A nearly total desorption occurred only when these saturated supports were treated with solutions of high ionic strength (4 M potassium chloride). © 2002 Wiley Periodicals, Inc. J Appl Polym Sci 87: 1660–1665, 2003