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Journal of Chemistry
Volume 2017 (2017), Article ID 5763832, 8 pages
https://doi.org/10.1155/2017/5763832
Research Article

Removal of Cd (II) from Aqueous Media by Adsorption onto Chemically and Thermally Treated Rice Husk

1Department of Biology, University of Tolima, Altos de Santa Helena, C. P. 730006 Ibagué, Colombia
2Department of Chemistry, University of Tolima, Altos de Santa Helena, C. P. 730006 Ibagué, Colombia
3Department of Physics, University of Tolima, Altos de Santa Helena, C. P. 730006 Ibagué, Colombia

Correspondence should be addressed to Ramiro Uribe-Kaffure

Received 8 March 2017; Revised 9 May 2017; Accepted 15 May 2017; Published 6 June 2017

Academic Editor: Wenshan Guo

Copyright © 2017 María Camila Hoyos-Sánchez 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

Chemically and thermally treated rice husks were evaluated as a potential decontaminant of toxic Cd (II) in aqueous media. Rice husk (RH), a by-product from rice milling, was chemically treated with HCl and NaOH. Then, thermal treatments to 300, 500, and 700°C were applied. The chemical composition and morphological characteristics of RH were evaluated by different techniques. The specific surface area analysis of RH samples by BET nitrogen adsorption method provided specific surface areas ranging from 6 to 14 m2/g. SEM, FTIR, and EDX analyses of RH were carried out to determine the surface morphology, functional groups involved in metal binding mechanism, and C/O and C/Si ratios, respectively. The maximum Cd (II) adsorption capacity was 28.27 mg/g at an optimum pH, 6.0. The kinetic studies revealed that adsorption process followed the pseudo-second-order kinetic model.