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Journal of Nanomaterials
Volume 2015 (2015), Article ID 405036, 14 pages
http://dx.doi.org/10.1155/2015/405036
Research Article

Adsorption of Phenol from Aqueous Solutions by Carbon Nanomaterials of One and Two Dimensions: Kinetic and Equilibrium Studies

1Faculty of Chemistry, Autonomous University of the State of Mexico, Km. 12 de la Carretera Toluca-Atlacomulco, San Cayetano, 50200 Toluca, MEX, Mexico
2Center of Applied Physics and Advanced Technology, National Autonomous University of Mexico, Boulevard Juriquilla No. 3001, Juriquilla, 76230 Santiago de Querétaro, QRO, Mexico
3Division of Postgraduate Studies and Research, Technological Institute of Queretaro, Avenida Tecnológico s/n, Esquina Gral. Mariano Escobedo, Colonia Centro Histórico, 76000 Santiago de Querétaro, QRO, Mexico

Received 26 September 2015; Revised 28 November 2015; Accepted 29 November 2015

Academic Editor: Hassan Karimi-Maleh

Copyright © 2015 M. de la Luz-Asunción et al. This is an open access article distributed under the Creative Commons Attribution License, which permits unrestricted use, distribution, and reproduction in any medium, provided the original work is properly cited.

Abstract

Carbon nanomaterials have a great potential in environmental studies; they are considered as superior adsorbents of pollutants due to their physical and chemical properties. Functionalization and dimension play an important role in many functions of these nanomaterials including adsorption. In this research, adsorption process was achieved with one-dimension nanomaterials: single walled and multiwalled carbon nanotubes were used as received and after oxidation treatment also two-dimensional nanomaterials were used: graphene oxide and reduced graphene oxide. Carbon nanotubes were modified by hydrogen peroxide under microwave irradiation. The reduction of graphene oxide was achieved by using ascorbic acid. values obtained with the pseudo-second-order model are higher than 0.99. The results demonstrate that Freundlich isotherm provides the best fit for the equilibrium data (). values are between 0 and 1; this represents favorable adsorption between carbon nanomaterials and phenol. The adsorption process occurs by interactions and hydrogen bonding and not by electrostatic interactions. The results indicate that the adsorption of phenol on carbon nanomaterials depends on the adsorbents’ surface area, and it is negatively influenced by the presence of oxygenated groups.