H.G. Ibrahim, A. Y. Okasha, M. Aboabboud and M. Elatrash
Abstract
Experimental investigation of trivalent chromium Cr(III) removal by using solid waste material (bypass cement kiln dust
(BCKD)) were conducted by varying of various parameters such as contact time, initial chromium ion concentration,
BCKD dose and initial pH. Investigations show that an optimum range of removal by adsorption is ranged (2-3) while
increasing of pH up to range (6.5-8) that gave a best percentage of removal by precipitation process. Langmuir and
Freundlich isotherm models were applied to the equilibrium data. Results shown that the percentage adsorption increased
with decrease in pH and showed maximum removal of Cr(III) at initial pH value 2.5. Also thermodynamic parameters
such as standard Gibbs energy ΔGo
, heat of adsorption ΔHo
and entropy ΔSo
were estimated. These thermodynamic
parameters showed the process to be endothermic in nature. Desorption of Cr(III) from the spent BCKD has also been
investigated. Desorption process suggest that the adsorption of Cr(III) ions on BCKD involves physisorption mechanism.
Publication Date
6/18/2013
Publisher
Proceedings of 2nd international Conference on Environmental Science and Technology – 2013 (ICOEST'2013 – Side, Nevşehir, TURKEY
علي يوسف عكاشة | Aly Y. Okasha | 11234