Sorption Isotherms, Kinetics, and Thermodynamics of Contaminants in Indian Soils
Publication: Journal of Environmental Engineering
Volume 144, Issue 10
Abstract
The sorption isotherms, kinetics, and thermodynamics of contaminants, e.g., strontium, lead, and uranium, for four different Indian soils (named S1, S2, S3, and S4) were investigated. Batch testing was performed to determine sorption properties of the soils. It was found that among the four soils, S1 has the maximum sorption at each contaminant metal. The uptake capacity for strontium, lead, and uranium was found to be 55.78, 103.6, and , respectively, after 24 h interaction at 45°C. The Langmuir and Freundlich isotherms have shown good fits () in comparison with other isotherms, revealing the sorption characteristics of the soil–contaminant system (SCS). The experimental data of the SCS followed pseudo-second-order kinetics; however, Soils S1 and S2 exhibited a pseudo-first-order reaction on sorption of uranium. The effect of temperatures from 27°C to 45°C on sorption has revealed higher uptake of contaminant metals onto soils, and sorption of SCS is established to be spontaneous and endothermic. Moreover, the results revealed the physisorption regime in the SCS, and the soils exhibit good binding with the contaminants.
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Acknowledgments
The part of work performed at IIT Bombay and valuable insights given by Prof. D. N. Singh, Dept. of Civil Engineering (IIT Bombay) are duly acknowledged.
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Published In
Journal of Environmental Engineering
Volume 144 • Issue 10 • October 2018
Copyright
©2018 American Society of Civil Engineers.
History
Received: Oct 3, 2017
Accepted: May 10, 2018
Published online: Aug 13, 2018
Published in print: Oct 1, 2018
Discussion open until: Jan 13, 2019
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