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Investigation of the Cr(VI) removal from aqueous solutions by stabilized iron-nanoparticles using 51Cr-tracer

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Abstract

Stabilized iron-nanoparticles were used for the Cr(VI)-removal from acidic and neutral aqueous solutions (pH 1, 3, 5 and 7). The chromium interaction with the iron-nanoparticles was studied by a batch technique under different experimental conditions (e.g. pH, temperature, contact time, solid to liquid ratio) using 51Cr as radiotracer and gamma-ray spectroscopy. The results showed that the Cr-removal was fast and the interaction kinetics could be described by a pseudo-second order rate equation. The maximum Cr-removal was observed from solutions of initial pH 3. The sorption showed a positive temperature and solid to liquid ratio dependence. The experimental results were modeled using the Langmuir, Freundlich and Dubinin–Radushkevich isotherm equations and compared with literature data obtained using other sorbents. X-ray photoelectron spectroscopy (XPS) measurements were performed in order to obtain information about the mechanism of the Cr-removal by the iron-nanoparticles. It was demonstrated that the dominated process based on the Cr(VI) reduction followed by the simultaneous oxidation of iron.

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Acknowledgments

The authors would like to thank the company NAΝOIRON s.r.o. for providing the iron-nanoparticles sorbent. M. Filippousi and G. Vourougis are also thankfully acknowledged for their help with the TEM examination.

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Authors and Affiliations

  1. Department of Chemistry, Aristotle University, 541 24, Thessaloniki, Greece

    A. Bampaiti, F. Noli & P. Misaelides

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  1. A. Bampaiti
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  2. F. Noli
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  3. P. Misaelides
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Correspondence to F. Noli.

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Bampaiti, A., Noli, F. & Misaelides, P. Investigation of the Cr(VI) removal from aqueous solutions by stabilized iron-nanoparticles using 51Cr-tracer. J Radioanal Nucl Chem 298, 909–914 (2013). https://doi.org/10.1007/s10967-013-2483-1

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  • DOI: https://doi.org/10.1007/s10967-013-2483-1

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