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Interaction of heavy metals with chitin and chitosan. III. Chromium
Author(s) -
Maruca R.,
Suder Billie Jo,
Wightman J. P.
Publication year - 1982
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.1982.070271227
Subject(s) - chitosan , chitin , chromium , aqueous solution , nuclear chemistry , distilled water , chemistry , desorption , phosphate , adsorption , chromatography , organic chemistry
The interaction of the natural marine polymer chitin and its deacetylated derivative chitosan with chromium has been investigated. The uptake of chromium from aqueous solution was determined from changes in concentration as measured by atomic absorption spectroscopy. The uptake of Cr(III) on chitosan was significantly greater than that on chitin. The smaller the size fraction of the chitin/chitosan, the greater the uptake of Cr(III). The Cr(III) uptake increased with increasing solution pH. Minimal desorption of chromium was observed on washing previously chromium‐equilibrated chitosan with distilled water. The uptake of Cr(III) by chitosan was enhanced in the presence of phosphate, whereas the converse was not observed. Minimal uptake of Cr(VI) as dichromate by chitin and chitosan was measured. Cr‐containing nodules were noted in the SEM/EDAX analysis for Cr(III)‐equilibrated chitosan. Cr‐containing clusters were detected for Cr(III)‐ plus phosphate‐equilibrated chitosan. XPS results supported the conclusions drawn from the isotherm studies.