Kinetic and Equilibrium Studies of Liquid-Phase Adsorption of Phosphate on Modified Sugarcane Bagasse
Publication: Journal of Environmental Engineering
Volume 138, Issue 3
Abstract
Phosphate removal from aqueous solutions was investigated using chemically modified sugarcane bagasse. The modified sugarcane bagasse (MSBG) is an agricultural by-product adsorbent with anion exchange functionality MSBG and raw sugarcane bagasse (SBG) were characterized by elemental analysis, zeta-potential analysis surface-area determination, and SEM. Adsorption kinetics and the equilibrium of phosphate between aqueous solutions and MSBG were studied. The adsorption capacity of MSBG was at natural pH when of phosphate solution was adsorbed by 0.100 g of sorbent. The kinetic data was fitted using a pseudo-first-order equation and a pseudo-second-order equation. Among the kinetic model studies, the pseudo-second-order equation was the best-fit model for describing the adsorption process. Equilibrium data were modeled using the Langmuir and the Freundlich isotherms. The Langmuir isotherm model fits much better than the Freundlich model. The desorption study indicated that the sorbent could be recovered in 0.05 M NaOH solution within 30 min.
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Acknowledgments
The authors acknowledge the financial support of the National Major Research Plan for Water Pollution Control and Treatment of China (UNSPECIFIED2009ZX07105-003 and UNSPECIFIED2009ZX07101-015) for this study. This work was also supported by Project of University Key Discipline Construction of Hebei.
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© 2012 American Society of Civil Engineers.
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Received: Oct 18, 2010
Accepted: Apr 14, 2011
Published online: Apr 15, 2011
Published in print: Mar 1, 2012
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