As(III, V) Uptake from Nanostructured Iron Oxides and Oxyhydroxides: The Complex Interplay between Sorbent Surface Chemistry and Arsenic Equilibria.

ABSTRACT: Iron oxides/oxyhydroxides, namely maghemite, iron oxide-silica composite, akaganeite, and ferrihydrite, are studied for AsV and AsIII removal from water in the pH range 2-8. All sorbents were characterized for their structural, morphological, textural, and surface charge properties. The same experimental conditions for the batch tests permitted a direct comparison among the sorbents, particularly between the oxyhydroxides, known to be among the most promising As-removers but hardly compared in the literature. The tests revealed akaganeite to perform better in the whole pH range for AsV (max 89 mg g-1 at pH0 3) but to be also efficient toward AsIII (max 91 mg g-1 at pH0 3-8), for which the best sorbent was ferrihydrite (max 144 mg g-1 at pH0 8). Moreover, the study of the sorbents' surface

SUBMITTER: Sanna Angotzi M 

PROVIDER: S-EPMC8840107 | biostudies-literature | 2022 Jan

REPOSITORIES: biostudies-literature