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Adsorption and desorption of methylene blue on porous carbon monoliths and nanocrystalline cellulose

He, Xiaoyun and Male, Keith B. and Nesterenko, Pavel and Brabazon, Dermot and Paull, Brett and Luong, John H.T. (2013) Adsorption and desorption of methylene blue on porous carbon monoliths and nanocrystalline cellulose. Applied Materials & Interfaces, 5 (17). pp. 8796-8804. ISSN 1944-8244

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Abstract

The dynamic batch adsorption of methylene blue (MB), a widely used and toxic dye, onto nanocrystalline cellulose (NCC) and crushed powder of carbon monolith (CM) was investigated using the pseudo-first- and -second-order kinetics. CM outperformed NCC with a maximum capacity of 127 mg/g compared to 101 mg/g for NCC. The Langmuir isotherm model was applicable for describing the binding data for MB on CM and NCC, indicating the homogeneous surface of these two materials. The Gibbs free energy of −15.22 kJ/mol estimated for CM unravelled the spontaneous nature of this adsorbent for MB, appreciably faster than the use of NCC (−4.47 kJ/mol). Both pH and temperature exhibited only a modest effect on the adsorption of MB onto CM. The desorption of MB from CM using acetonitrile was very effective with more than 94 % of MB desorbed from CM within 10 min to allow the reusability of this porous carbon material. In contrast, acetonitrile was less effective than ethanol in desorbing MB from NCC. The two solvents were incapable of completely desorbing MB on commercial granular coal-derived activated carbon.

Item Type:Article (Published)
Refereed:Yes
Uncontrolled Keywords:Carbon monolith; Nanocrystalline cellulose; Activated carbon; Methylene blue; Adsorption; Desorption; Kinetics
Subjects:Physical Sciences > Chemistry
DCU Faculties and Centres:Research Initiatives and Centres > Irish Separation Science Cluster (ISSC)
Publisher:American Chemical Society
Official URL:http://dx.doi.org/10.1021/am403222u
Copyright Information:© 2013 ACS This document is the Accepted Manuscript version of a Published Work that appeared in final form in Applied Materials & Interfaces, copyright © American Chemical Society after peer review and technical editing by the publisher. To access the final edited and published work see http://dx.doi.org/10.1021/am403222u.
Use License:This item is licensed under a Creative Commons Attribution-NonCommercial-Share Alike 3.0 License. View License
ID Code:20527
Deposited On:27 Mar 2015 11:13 by Fran Callaghan. Last Modified 27 Mar 2015 11:13

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