Adsorption Characteristics of Modified Wheat Husk for the Removal of a Toxic Dye, Methylene Blue, from Aqueous Solutions
Publication: Journal of Hazardous, Toxic, and Radioactive Waste
Volume 18, Issue 1
Abstract
Adsorption characteristics of modified wheat husk for the removal of a toxic cationic dye, methylene blue, from aqueous solutions have been investigated. The adsorbent, wheat husk, was characterized by Fourier transform infrared spectra (FTIR) and scanning electron microscopy (SEM) for its functional group and surface characteristics. The removal decreased by increasing temperature from 303 to 373 K. The removal was found to be pH dependent, and it decreased from 96.2 to 40.7% by varying the pH of the solution from 4.5 to 9.5. It was observed that 93.4% removal of methylene blue was achieved at an initial dye concentration of at 303 K. Equilibrium adsorption data for the removal of methylene blue were analyzed by Langmuir, Freundlich, and Tempkin isotherm models. Values of thermodynamic parameters viz , , and were determined. The negative value of confirmed the exothermic nature of removal of methylene blue by adsorption on modified wheat husk.
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Acknowledgments
The author (SB) is thankful for CSIR, Government of India, for providing financial assistance as a Junior Research Fellowship (JRF).
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Published In
Journal of Hazardous, Toxic, and Radioactive Waste
Volume 18 • Issue 1 • January 2014
Pages: 56 - 63
Copyright
© 2014 American Society of Civil Engineers.
History
Received: Dec 6, 2012
Accepted: Feb 21, 2013
Published online: Feb 23, 2013
Discussion open until: Jul 23, 2013
Published in print: Jan 1, 2014
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