Mill Scale–Derived Magnetite Particles: Effective Adsorbent for the Removal of Phosphate in Aqueous Solutions
Publication: Journal of Environmental Engineering
Volume 143, Issue 12
Abstract
Mill scale, an iron waste, was used to synthesize magnetite particles for the adsorption of phosphate from an aqueous solution. Several techniques were used to characterize the adsorbents. Mill scale–derived magnetite particles exhibited a strong uptake affinity to phosphate in a wide pH range of 3–7, with the maximum adsorptive removal of 100% at an adsorbent concentration of and pH 3–5. The Langmuir isotherm model well described the equilibrium data, exhibiting maximum adsorption capacities for phosphate up to 4.95 and at 298 and 308 K, respectively. Kinetic data correlated well with the pseudo-second-order kinetic model, indicating that chemisorption is involved in the adsorption process. The phosphate adsorption was highly pH-dependent, and the presence of , , and ions had no effect on phosphate removal. X-ray photoelectron spectroscopy (XPS) results revealed that phosphate was bonded onto the surface of magnetite predominantly through bidentate complexation. Desorption was performed on mill scale–derived magnetite to check recyclability. Five successive adsorption/regeneration cycles were successfully applied with a slight decrease in the adsorbent adsorption capacity.
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Acknowledgments
This work was supported by 2015 Advanced Industrial Technology Development Program by the Ministry of Environment (MOE), Republic of Korea (Project 2015000150006).
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Published In
Journal of Environmental Engineering
Volume 143 • Issue 12 • December 2017
Copyright
©2017 American Society of Civil Engineers.
History
Received: Nov 29, 2016
Accepted: Jun 1, 2017
Published online: Sep 23, 2017
Published in print: Dec 1, 2017
Discussion open until: Feb 23, 2018
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