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Please use this identifier to cite or link to this item: http://repository.iitr.ac.in/handle/123456789/14628
Title: Adsorption of arsenite using natural laterite as adsorbent
Authors: Maiti, Abhijit
DasGupta S.
Basu J.K.
De S.
Published in: Separation and Purification Technology
Abstract: Arsenite removal capacity of natural laterite (NL), collected from Kharagpur, in the district of Midnapore, West Bengal, India, has been investigated. Effects of adsorbent dose, operating pH, contact time, initial arsenite concentration, adsorbent particle size, etc. on the removal of arsenite are examined. Kinetic study in agitated baffled vessel reveals that uptake of As(III) ions is rapid in the first two hours and slows down thereafter. Maximum removal efficiency of As(III) achieved is 98% at an adsorbent dose of 40 g/l with initial As(III) concentration of 1000 μg/l in batch studies and 94% at 20 g/l absorbent dose under the same conditions. Equilibrium time is almost independent of initial arsenite concentration. Equilibrium studies show that As(III) ions have high affinity towards NL even at very low concentration of arsenite. In speciation study, about 20% conversion to As(V) from As(III) is observed, with initial As(III) concentration of 1000 μg/l and at 20 g/l adsorbent dose. Thermodynamic parameters depicted the endothermic nature of adsorption. The results suggest that NL could be used as effective filter medium for removal of As(III) ions. © 2007 Elsevier B.V. All rights reserved.
Citation: Separation and Purification Technology (2007), 55(3): 350-359
URI: https://doi.org/10.1016/j.seppur.2007.01.003
http://repository.iitr.ac.in/handle/123456789/14628
Issue Date: 2007
Keywords: Adsorption
Arsenic speciation
Arsenite removal
Controlling step of adsorption
Equilibrium
Kinetic study
Laterite
ISSN: 13835866
Author Scopus IDs: 23994098600
7202154532
55520926800
7202304528
Author Affiliations: Maiti, A., Department of Chemical Engineering, Indian Institute of Technology, Kharagpur, Kharagpur, 721302, India
DasGupta, S., Department of Chemical Engineering, Indian Institute of Technology, Kharagpur, Kharagpur, 721302, India
Basu, J.K., Department of Chemical Engineering, Indian Institute of Technology, Kharagpur, Kharagpur, 721302, India
De, S., Department of Chemical Engineering, Indian Institute of Technology, Kharagpur, Kharagpur, 721302, India
Corresponding Author: De, S.; Department of Chemical Engineering, Indian Institute of Technology, Kharagpur, Kharagpur, 721302, India; email: sde@che.iitkgp.ernet.in
Appears in Collections:Journal Publications [PE]

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