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Title: Adsorptive removal of arsenic from water by an iron-zirconium binary oxide adsorbent
Authors: Ren, Z.
Zhang, G.
Paul Chen, J. 
Keywords: Adsorption
Fe-Zr binary oxide
Issue Date: 1-Jun-2011
Citation: Ren, Z., Zhang, G., Paul Chen, J. (2011-06-01). Adsorptive removal of arsenic from water by an iron-zirconium binary oxide adsorbent. Journal of Colloid and Interface Science 358 (1) : 230-237. ScholarBank@NUS Repository.
Abstract: Arsenate and arsenite may exist simultaneously in groundwater and have led to a greater risk to human health. In this study, an iron-zirconium (Fe-Zr) binary oxide adsorbent for both arsenate and arsenite removal was prepared by a coprecipitation method. The adsorbent was amorphous with a specific surface area of 339m2/g. It was effective for both As(V) and As(III) removal; the maximum adsorption capacities were 46.1 and 120.0mg/g at pH 7.0, respectively, much higher than for many reported adsorbents. Both As(V) and As(III) adsorption occurred rapidly and achieved equilibrium within 25h, which were well fitted by the pseudo-second-order equation. Competitive anions hindered the sorption according to the sequence PO4 3->SiO3 2->CO3 2->SO4 2-. The ionic strength effect experiment, measurement of zeta potential, and FTIR study indicate that As(V) forms inner-sphere surface complexes, while As(III) forms both inner- and outer-sphere surface complexes at the water/Fe-Zr binary oxide interface. The high uptake capability and good stability of the Fe-Zr binary oxide make it a potentially attractive adsorbent for the removal of both As(V) and As(III) from water. © 2011 Elsevier Inc.
Source Title: Journal of Colloid and Interface Science
ISSN: 00219797
DOI: 10.1016/j.jcis.2011.01.013
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