Application of a Thermally Modified Agrowaste Material for an Economically Viable Removal of Cr(VI) from Aqueous Solutions
Publication: Journal of Hazardous, Toxic, and Radioactive Waste
Volume 17, Issue 2
Abstract
Removal of Cr(VI) from aqueous solutions has been investigated by adsorption on a low-cost adsorbent, calcined rice husk (CRH). Rice husk is an agrowaste material. It was thermally treated in a muffle furnace at 650°C for 2 h to obtain CRH. The adsorbent, CRH, was characterized with X-ray diffraction and scanning electron microscopy for phase determination and its surface characteristics, respectively. The of the adsorbent was 8.82. The effect of important parameters, i.e., initial concentration, adsorbent dose, temperature, and pH, on the removal of Cr(VI) was studied. The removal decreased by increasing the temperature from 25 to 45°C. The pH of the aqueous solutions affected the removal of Cr(VI) significantly, and the removal decreased from 69 to 47% by varying the pH of the solutions from 2.0 to 10.0. The writers achieved 89% removal of Cr(VI) at an initial Cr(VI) concentration of , at 25°C and pH 2.0. Equilibrium adsorption data for the removal of Cr(VI) were analyzed by using Langmuir, Freundlich, and Tempkin isotherm models. The values of thermodynamic parameters, i.e., , , and , were determined. The negative value of confirmed the exothermic nature of removal of Cr(VI) through adsorption on CRH. The present study revealed that CRH can be an economically viable alternative for the removal of Cr(VI) from aqueous solutions.
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Acknowledgments
The writers are thankful to the Department of Science and Technology (DST), government of India, for providing financial assistance to Varsha Srivastava in the form of a WOS-A project. The writers are also thankful to the Department of Ceramic Engineering for providing XRD and SEM analysis of the samples.
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Published In
Journal of Hazardous, Toxic, and Radioactive Waste
Volume 17 • Issue 2 • April 2013
Pages: 125 - 133
Copyright
© 2013 American Society of Civil Engineers.
History
Received: Jun 19, 2012
Accepted: Oct 10, 2012
Published online: Oct 12, 2012
Published in print: Apr 1, 2013
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