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Please use this identifier to cite or link to this item: http://repository.iitr.ac.in/handle/123456789/14663
Title: Chemical treated laterite as promising fluoride adsorbent for aqueous system and kinetic modeling
Authors: Maiti, Abhijit
Basu J.K.
De S.
Published in: Desalination
Abstract: Efficiency of acid-base treated raw laterite (RL) is investigated for removal of fluoride. FTIR, SEM-EDX, and surface area analyzer are used to characterize the treated laterite (TL). The batch adsorption of fluoride is explored using TL under varying process conditions like adsorbent dose, pH of solution, temperature, particle size and contact time. The adsorption isotherm data of fluoride ions on TL are fitted well to both Langmuir and Freundlich models. The temperature dependent maximum Langmuir adsorption capacities of fluoride ion on TL are found to be 36.3, 37.9, and 39.1mg/g at 288, 305, and 315K, respectively. A simple shrinking core model is applied to predict the batch adsorption kinetics of fluoride ions onto treated laterite (TL). In the proposed two-resistance model, external mass transfer (Kf) and pore diffusion coefficient (De) are estimated by comparing the simulated concentration profile with the experimental data using a non-linear optimization technique. Estimated values of De and Kf are found to be 4.8×10-10m2/s and 8.5×10-4m/s at 305K, respectively. The fluoride adsorption in presence of other competitive ions as well as desorption of fluoride ions from spent adsorbent are studied in detail. © 2010 Elsevier B.V.
Citation: Desalination (2011), 265(43891): 28-36
URI: https://doi.org/10.1016/j.desal.2010.07.026
http://repository.iitr.ac.in/handle/123456789/14663
Issue Date: 2011
Keywords: Adsorption kinetic modeling
Fluoride removal
Raw laterite
Shrinking core model
ISSN: 119164
Author Scopus IDs: 23994098600
55520926800
7202304528
Author Affiliations: Maiti, A., Department of Chemical Engineering, Indian Institute of Technology, Kharagpur-721302, India
Basu, J.K., Department of Chemical Engineering, Indian Institute of Technology, Kharagpur-721302, India
De, S., Department of Chemical Engineering, Indian Institute of Technology, Kharagpur-721302, India
Funding Details: This work is partially supported by a grant from the Department of Science and Technology, New Delhi, Government of India under the scheme no. DST/TDT/WTI/2 K7/04 . Any opinions, findings and conclusions expressed in this paper are those of the authors and do not necessarily reflect the views of DST.
Corresponding Author: De, S.; Department of Chemical Engineering, Indian Institute of Technology, Kharagpur-721302, India; email: sde@che.iitkgp.ernet.in
Appears in Collections:Journal Publications [PE]

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