期刊
NANOMATERIALS
卷 12, 期 3, 页码 -出版社
MDPI
DOI: 10.3390/nano12030326
关键词
akaganeite; ferrihydrite; maghemite; arsenic; water remediation; beta-FeOOH
类别
资金
- CESA Project-RAS Piano Sulcis [E58C16000080003]
- Fluorsid S.p.A.
- PON AIM (PON Ricerca e Innovazione 2014-2020-Azione I.2-D.D. del 27 febbraio 2018 Attraction and International Mobility, project Cult-GeoChim) [AIM1890410-3, 407]
- MIUR-National Program PON Ricerca e Innovazione 2014-2020 [J88D19001040001]
- Fondazione di Sardegna, Italy
- Fondazione di Sardegna (FdS) [F72F20000240007]
This study investigates the removal of As-V and As-III from water using iron oxides/oxyhydroxides, with akaganeite found to be the most effective sorbent in the pH range 2-8. The surface chemistry of the sorbents plays a crucial role in the arsenic uptake, and the ability to modify the starting pH is a key factor in determining the removal performance. The study provides insights into the uptake mechanism and offers a direct comparison among the sorbents.
Iron oxides/oxyhydroxides, namely maghemite, iron oxide-silica composite, akaganeite, and ferrihydrite, are studied for As-V and As-III 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 As-V (max 89 mg g(-1) at pH(0) 3) but to be also efficient toward As-III (max 91 mg g(-1) at pH(0) 3-8), for which the best sorbent was ferrihydrite (max 144 mg g(-1) at pH(0) 8). Moreover, the study of the sorbents' surface chemistry under contact with arsenic and arsenic-free solutions allowed the understanding of its role in the arsenic uptake through electrophoretic light scattering and pH measurements. Indeed, the sorbent's ability to modify the starting pH was a crucial step in determining the removal of performances. The As-V initial concentration, contact time, ionic strength, and presence of competitors were also studied for akaganeite, the most promising remover, at pH(0) 3 and 8 to deepen the uptake mechanism.
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