期刊
HYDROMETALLURGY
卷 99, 期 3-4, 页码 170-174出版社
ELSEVIER SCIENCE BV
DOI: 10.1016/j.hydromet.2009.08.002
关键词
Chromium(III); Tannery effluent; Cation exchange; Indian 790 resin; Sulfonated styrene-DVB resin
资金
- Planning Commission, Govt. of India, through Council of Scientific & Industrial Research (CSIR) New Delhi
Extraction of chromium(III) from a model solution and from a tannery waste solution was studied by ion exchange using Indion 790 resin which is a macro-porous strongly acidic cation exchange resin of sulfonated polystyrene group. The resin was found to be selective for the sorption of chromium(III) in the pH range 0.5-3.5 from a model solution containing 500 ppm Cr(III). Beyond pH 3.5 extraction of chromium(III) drastically decreased from 92% to 76%. Sorption of chromium(III) on Indion 790 followed the Freundlich isotherm with a high Freundlich constant value (K-f = 8.57) confirming strong chemical interaction of the metal ion with the resin. Desorption of chromium(Ill) from the loaded resin increased with the increase in concentration of eluant (5-20% H2SO4). With 20% sulfuric acid solution 89% Cr(III) was eluted in two stages. The bench scale results were also validated in continuous mode in a fixed bed column and for the recovery of chromium(III) from a tannery solution. (C) 2009 Elsevier B.V. All rights reserved.
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