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Title: Multiwalled CNTs for Cr(VI) removal from industrial wastewater: An advanced study on adsorption, kinetics, thermodynamics for the comparison between the embedded and non-embedded carboxyl group
Authors: Verma B.
Goel S.
Balomajumder, Chandrajit
Published in: Canadian Journal of Chemical Engineering
Abstract: The adsorption capabilities of multiwalled carbon nanotubes (MWCNTs) with and without the embedded carboxyl group for the removal of parts per million levels of hexavalent chromium were examined as a function of several parameters, namely contact time, pH of initial solution, initial concentration of Cr(VI), adsorbent dosage as well as temperature of solution. Adsorption isotherms have been utilized to explain the adsorption mechanism. Ion exchange, intra-particle diffusion, and electrostatic interactions are found to be the fundamental mechanisms describing the adsorption of Cr(VI). The maximum adsorption capacities of Cr(VI) ion by raw MWCNTs and functionalized MWCNTs were found to be 84.75 and 78.13 mg · g−1, respectively, as calculated by the Langmuir adsorption isotherm model. This is with regard to the electron-rich atoms inside the functional group which repels the negatively charged dichromate ions. Kinetic studies were performed, and the data was found in good agreement with the pseudo-second-order. © 2020 Canadian Society for Chemical Engineering
Citation: Canadian Journal of Chemical Engineering, 99(1): 281-293
Issue Date: 2021
Publisher: Wiley-Liss Inc.
Keywords: carbon nanotubes
hexavalent chromium
multiwalled CNTs
wastewater treatment
ISSN: 84034
Author Scopus IDs: 57191976974
Author Affiliations: Verma, B., Department of Chemical Engineering, IIT Roorkee, Roorkee, India
Goel, S., Department of Chemical Engineering, BIET Jhansi, Jhansi, India
Balomajumder, C., Department of Chemical Engineering, IIT Roorkee, Roorkee, India
Corresponding Author: Verma, B.; Department of Chemical Engineering, India; email:
Appears in Collections:Journal Publications [CH]

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