The application of almond shell as a low cost natural adsorbent to remove Hg2+ from aqueous solution was investigated. Batch experiments were carried out to evaluate the adsorption capacity of the material. The chemical and physical parameters such as pH, sorbent amount, initial ion concentration, and contact time were optimized for the maximum uptake of mercury onto the solid surface. Adsorption isotherms were expressed by Langmuir and Freundlich adsorption models, and the experimental data were found to fit the Langmuir model rather than the Freundlich. The maximum adsorption capacity obtained from the Langmuir isotherm was 135.13 mg/g. A kinetic study was carried out with pseudo-first-order and pseudo-second-order reaction equations and it was found that the Hg2+ uptake process followed the pseudo-second-order rate expression. The thermodynamic values, ΔG0, ΔH0 and ΔS0, indicated that adsorption was an endothermic and spontaneous process. The potential of this material for mercury elimination was demonstrated by efficient Hg2+ removal from a synthetic effluent.
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Research Article|
April 01 2012
Equilibrium, kinetic and thermodynamic studies of mercury adsorption on almond shell Available to Purchase
Shokooh Sadat Khaloo;
1Department of Science, Faculty of Health, Safety and Environment, Shahid Beheshti University of Medical Sciences, P.O. Box 16858-116, Tehran, Iran
E-mail: [email protected]
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Amir Hossein Matin;
Amir Hossein Matin
2Department of Hygiene Sciences, Faculty of Health, Safety and Environment, Shahid Beheshti University of Medical Sciences, P.O. Box 16858-116, Tehran, Iran
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Sahar Sharifi;
Sahar Sharifi
2Department of Hygiene Sciences, Faculty of Health, Safety and Environment, Shahid Beheshti University of Medical Sciences, P.O. Box 16858-116, Tehran, Iran
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Masoumeh Fadaeinia;
Masoumeh Fadaeinia
2Department of Hygiene Sciences, Faculty of Health, Safety and Environment, Shahid Beheshti University of Medical Sciences, P.O. Box 16858-116, Tehran, Iran
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Narges Kazempour;
Narges Kazempour
2Department of Hygiene Sciences, Faculty of Health, Safety and Environment, Shahid Beheshti University of Medical Sciences, P.O. Box 16858-116, Tehran, Iran
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Shaghayegh Mirzadeh
Shaghayegh Mirzadeh
2Department of Hygiene Sciences, Faculty of Health, Safety and Environment, Shahid Beheshti University of Medical Sciences, P.O. Box 16858-116, Tehran, Iran
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Water Sci Technol (2012) 65 (8): 1341–1349.
Article history
Received:
April 24 2011
Accepted:
July 07 2011
Citation
Shokooh Sadat Khaloo, Amir Hossein Matin, Sahar Sharifi, Masoumeh Fadaeinia, Narges Kazempour, Shaghayegh Mirzadeh; Equilibrium, kinetic and thermodynamic studies of mercury adsorption on almond shell. Water Sci Technol 1 April 2012; 65 (8): 1341–1349. doi: https://doi.org/10.2166/wst.2012.767
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