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Kinetic modeling of arsenic removal from water by ferric ion loaded red mud

Kocabaş, Özlem Züleyha and Yürüm, Yuda (2011) Kinetic modeling of arsenic removal from water by ferric ion loaded red mud. Separation Science and Technology, 46 (15). pp. 2380-2390. ISSN 0149-6395

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Official URL: http://dx.doi.org/10.1080/01496395.2011.595757

Abstract

A laboratory study was conducted to investigate the ability of ferric ion loaded red mud (FRM) for the removal of arsenic species from water. The adsorbent material was characterized by scanning electron microscopy, X-ray diffraction, and Fourier transform infrared spectroscopy. For an initial arsenic concentration lower than 0.3 mg/L, the FRM with a dosage of 1 g/L was able to reduce As(III) at pH 7 below 10 µg/L, the maximum contaminant level (MCL) of arsenic in drinking water set by the World Health Organization. In the case of As(V) removal, FRM was also particularly effective in reducing the initial arsenic concentration value of 1 mg/L at pH 2, below the MCL requirement of arsenic for drinking water. According to kinetic sorption data, the initial stage of adsorptions of As(III) and As(V) onto FRM were mainly governed by the external diffusion mechanism; however, upon saturation of the external adsorbent surface, the arsenic species were eventually adsorbed by intraparticle diffusion mechanism. The present results are promising for using the very inexpensive FRM as a low-cost material that is effective in remediating drinking waters contaminated with low concentrations of arsenic species. We report here the sorption kinetics and adsorption mechanisms of As(III) and As(V) on the FRM that has not been decsribed previously.

Item Type:Article
Uncontrolled Keywords:adsorption isotherm, arsenic removal, ferric ion, kinetics, red mud
Subjects:T Technology > TP Chemical technology > TP0155-156 Chemical engineering
ID Code:17842
Deposited By:Yuda Yürüm
Deposited On:04 Jan 2012 09:45
Last Modified:05 Apr 2012 11:08

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