期刊
CHEMICAL ENGINEERING JOURNAL
卷 193, 期 -, 页码 131-138出版社
ELSEVIER SCIENCE SA
DOI: 10.1016/j.cej.2012.04.036
关键词
Arsenite; Fe-Mn binary oxide; Macroporous anion exchanger; Nanocomposite; Oxidation; Adsorption
资金
- NSFC [51178214/51078179]
- Jiangsu NSF [BK2011016]
- New Century Excellent Talents in University of China [NCET-10-0490]
Fe-Mn binary oxide is a promising material for As(III) removal through a combined oxidation and adsorption process. To improve its applicability in column or other now-through systems, we developed a new nanocomposite motivated by the Donnan membrane principle, i.e., Fe-Mn binary oxide encapsulated within a polystyrene anion exchanger D201 (designated D201-Fe/Mn), for efficient As(III) removal from water. As compared to single Fe(III) oxide-loaded D201, the resultant D201-Fe/Mn was less sensitive to pH variation in the range of 4-10 and exhibited higher As(III) capacity. X-ray photoelectron spectroscopy (XPS) analysis confirmed that As(III) was oxidized to As(V) by Mn(IV) oxide during its sequestration by D201-Fe/Mn, whereas Mn(IV) was reduced to MnOOH* and consequently to Mn(II) simultaneously. The exhausted D201-Fe/Mn could be regenerated by NaOH-NaCl-NaClO solution for repeated use without any significant capacity loss, where the adsorbed As species was effectively desorbed to solution and the Mn(II) species was oxidized back to Mn(IV). High-level phosphate and silicate would pose strong competition for As(III) adsorption by D201-Fe/Mn, while sulfate and chloride did not show significant competition under similar conditions. Fixed-bed adsorption further validated that D201-Fe/Mn would be of considerable potential in As(III) removal from contaminated waters. (C) 2012 Elsevier B.V. All rights reserved.
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