Effective adsorbent for arsenic removal: core/shell structural nano zero-valent iron/manganese oxide |
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| Authors: | Trung Huu Bui Choonsoo Kim Sung Pil Hong Jeyong Yoon |
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| Institution: | 1.School of Chemical and Biological Engineering, College of Engineering, Institute of Chemical Process,Seoul National University (SNU),Seoul,Republic of Korea;2.Asian Institute for Energy, Environment & Sustainability (AIEES),Seoul National University (SNU),Seoul,Republic of Korea |
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| 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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