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. 2011 May 15;189(1-2):564-71.
doi: 10.1016/j.jhazmat.2011.02.071. Epub 2011 Mar 2.

Sorption of arsenite and arsenate on ferrihydrite: effect of organic and inorganic ligands

Jun Zhu  1 , Massimo Pigna, Vincenza Cozzolino, Antonio G Caporale, Antonio Violante
Affiliations

Sorption of arsenite and arsenate on ferrihydrite: effect of organic and inorganic ligands

Jun Zhu et al. J Hazard Mater. .

Abstract

We studied the sorption of As(III) and As(V) onto ferrihydrite as affected by pH, nature and concentration of organic [oxalic (OX), malic (MAL), tartaric (TAR), and citric (CIT) acid] and inorganic [phosphate (PO(4)), sulphate (SO(4)), selenate (SeO(4)) and selenite (SeO(3))] ligands, and the sequence of anion addition. The sorption capacity of As(III) was greater than that of As(V) in the range of pH 4.0-11.0. The capability of organic and inorganic ligands in preventing As sorption follows the sequence: SeO(4) ≈ SO(4) < OX < MAL ≈ TAR < CIT < SeO(3) ≪ PO(4). The efficiency of most of the competing ligands in preventing As(III) and As(V) sorption increased by decreasing pH, but PO(4) whose efficiency increased by increasing pH. In acidic systems all the competing ligands inhibited the sorption of As(III) more than As(V), but in alkaline environments As(III) and As(V) seem to be retained with the same strength on the Fe-oxide. Finally, the competing anions prevented As(III) and As(V) sorption more when added before than together or after As(III) or As(V).

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