Abstract
Recently, nano zero-valent iron (nZVI) has emerged as an effective adsorbent for the removal of arsenic from aqueous solutions. However, its use in various applications has suffered from reactivity loss resulting in a decreased efficiency. Thus, the aim of this study was to develop an effective arsenic adsorbent as a core/shell structural nZVI/manganese oxide (or nZVI/Mn oxide) to minimize the reactivity loss of the nZVI. As the major result, the arsenic adsorption capacities of the nZVI/Mn oxide for As(V) and As(III) were approximately two and three times higher than that of the nZVI, respectively. In addition, the As(V) removal efficiency of the nZVI/Mn oxide was maintained through 4 cycles of regeneration whereas that of the nZVI was decreased significantly. The enhanced reactivity and reusability of the nZVI/Mn oxide can be successfully explained by the synergistic interaction of the nZVI core and manganese oxide shell, in which the manganese oxides participate in oxidation reactions with corroded Fe2+ and subsequently retard the release of aqueous iron providing additional surface sites for arsenic adsorption. In summary, this study reports the successful fabrication of a core/shell nZVI/Mn oxide as an effective adsorbent for the removal of arsenic from aqueous solutions.
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Acknowledgements
This research was supported by the R&D Program for the Society of the National Research Foundation (NRF) funded by the Ministry of Science, ICT & Future Planning (grant number NRF-2013K1A3A9A04043230) and by Korea Ministry of Environment as “Global Top Project (E617-00211-0608-0)”, and a grant (code 17IFIP-B065893-05) from Industrial Facilities & Infrastructure Research Program funded by Ministry of Land, Infrastructure and Transport of Korean government.
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Bui, T.H., Kim, C., Hong, S.P. et al. Effective adsorbent for arsenic removal: core/shell structural nano zero-valent iron/manganese oxide. Environ Sci Pollut Res 24, 24235–24242 (2017). https://doi.org/10.1007/s11356-017-0036-9
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DOI: https://doi.org/10.1007/s11356-017-0036-9