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Water 2019, 11(1), 181; https://doi.org/10.3390/w11010181

Uptake of Sb(V) by Nano Fe3O4-Decorated Iron Oxy-Hydroxides

1
Analytical Chemistry Laboratory, Department of Chemical Engineering, Aristotle University of Thessaloniki, 54124 Thessaloniki, Greece
2
EcoResources P.C., 55131 Kalamaria, Thessaloniki, Greece
3
Department of Physics, Aristotle University of Thessaloniki, 54124 Thessaloniki, Greece
4
Institut de Ciència de Materials de Barcelona, Campus Universitat Autònoma de Barcelona, 08193 Bellaterra, Spain
*
Author to whom correspondence should be addressed.
Received: 15 December 2018 / Revised: 10 January 2019 / Accepted: 15 January 2019 / Published: 21 January 2019
(This article belongs to the Special Issue Technologies Developing in Heavy Metals' Removal from Water)
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Abstract

The presence of antimony in water remains a major problem for drinking water technology, defined by the difficulty of available adsorbents to comply with the very low regulation limit of 5 μg/L for the dominant Sb(V) form. This study attempts to develop a new class of water adsorbents based on the combination of amorphous iron oxy-hydroxide with Fe3O4 nanoparticles and optimized to the sufficient uptake of Sb(V). Such a Fe3O4/FeOOH nanocomposite is synthesized by a two-step aqueous precipitation route from iron salts under different oxidizing and acidity conditions. A series of materials with various contents of Fe3O4 nanoparticles in the range 0–100 wt % were prepared and tested for their composition, and structural and morphological features. In order to evaluate the performance of prepared adsorbents, the corresponding adsorption isotherms, in the low concentration range for both Sb(III) and Sb(V), were obtained using natural-like water. The presence of a reducing agent such as Fe3O4 results in the improvement of Sb(V) uptake capacity, which is found around 0.5 mg/g at a residual concentration of 5 μg/L. The intermediate reduction of Sb(V) to Sb(III) followed by Sb(III) adsorption onto FeOOH is the possible mechanism that explains experimental findings. View Full-Text
Keywords: drinking water; antimony; Fe3O4 nanoparticles; iron oxy-hydroxide; adsorbent; isotherms; SEM; XRD drinking water; antimony; Fe3O4 nanoparticles; iron oxy-hydroxide; adsorbent; isotherms; SEM; XRD
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This is an open access article distributed under the Creative Commons Attribution License which permits unrestricted use, distribution, and reproduction in any medium, provided the original work is properly cited (CC BY 4.0).
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Simeonidis, K.; Kalaitzidou, K.; Kaprara, E.; Mitraka, G.; Asimakidou, T.; Balcells, L.; Mitrakas, M. Uptake of Sb(V) by Nano Fe3O4-Decorated Iron Oxy-Hydroxides. Water 2019, 11, 181.

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