Abstract
The accumulation of preheated chromium(III)-thiocyanate complexes onto polyurethane foam (PUF) has been studied. The maximum sorption of Cr(III) (7.01.10-5M) is occurred at pH 2 from 1.2M thiocyanate solution in 10 minute agitation time using 7.25 mg/ml PUF. The sorption data have been investigated by Langmuir, Freundlich and Dubinin-Radushkevich (D-R) isotherms. The Freundlich parameters 1/n = 0.31 and of K F = 9.7.10-4 mol.g-1, Langmuir constants M = 7.03.10-5 mol.g-1 and of b = 1.5.105 l.mol-1 and of D-R constants, C m = 1.91.10-4 mol.g-1, affinity coefficient b = -0.0023 mol2.kJ-2 and sorption energy E = 14.7 kJ.mol-1 have been evaluated. Thermodynamic parameters of enthalpy, entropy and Gibbs free energy suggest the endothermic and spontaneous adsorption of Cr(III)-SCN complex onto PUF at higher temperature. The influence of common anions and cations on the accumulation of chromium-thiocyanate on PUF and possible sorption mechanism of [Cr(SCN)4]- species on PUF is discussed.
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Saeed, M.M., Chaudhary, M.H. & Ahmed, M. Adsorption profile of preheated Cr(III)-SCN complexes on polyurethane foam. Journal of Radioanalytical and Nuclear Chemistry 258, 151–156 (2003). https://doi.org/10.1023/A:1026278630209
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DOI: https://doi.org/10.1023/A:1026278630209