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Journal of Nanomaterials
Volume 2010, Article ID 232378, 9 pages
http://dx.doi.org/10.1155/2010/232378
Research Article

Removal of Chromium (III) from Water by Using Modified and Nonmodified Carbon Nanotubes

1Chemical Engineering Department, King Fahd University of Petroleum & Minerals, Dhahran 31261, Saudi Arabia
2Center of Research Excellence in Nanotechnology (CENT), King Fahd University of Petroleum & Minerals, Dhahran 31261, Saudi Arabia
3Earth Sciences Department, King Fahd University of Petroleum & Minerals, KFUPM P.O. Box 952, Dhahran 31261, Saudi Arabia
4Center for Environment & Water, King Fahd University of Petroleum & Minerals, Dhahran 31261, Saudi Arabia
5Chemistry Department, King Fahd University of Petroleum & Minerals, Dhahran 31261, Saudi Arabia
6Hafr Al-Batin Community College, King Fahd University of Petroleum & Minerals, Hafr Al-Batin 31991, Saudi Arabia

Received 16 October 2009; Revised 21 January 2010; Accepted 9 March 2010

Academic Editor: Hongchen Chen Gu

Copyright © 2010 Muataz Ali Atieh 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

This study was carried out to evaluate the environmental application of modified and nonmodified carbon nanotubes through the experiment removal of chromium trivalent (III) from water. The aim was to find the optimal condition of the chromium (III) removal from water under different treatment conditions of pH, adsorbent dosage, contact time and agitation speed. Multi wall carbon nanotubes (MW-CNTs) were characterized by field emission scanning electron microscopy (FE-SEM) and transmission electron microscopy (TEM). The diameter of the carbon nanotubes produced varied from 20–40 nm with average diameter of 24 nm and 10 micrometer in length. Adsorption isotherms were used to model the adsorption behavior and to calculate the adsorption capacity of the absorbents. The results showed that, 18% of chromium (III) removal was achieved using modified carbon nanotubes (M-CNTs) at pH 7, 150 rpm, and 2 hours for a dosage of 150 mg of CNTs. The removal of Cr (III) is mainly attributed to the affinity of chromium (III) to the physical and chemical properties of the CNTs. The adsorption isotherms plots were well fitted with experimental data.