As<sup>(III, V)</sup> Uptake from Nanostructured Iron Oxides and Oxyhydroxides: The Complex Interplay between Sorbent Surface Chemistry and Arsenic Equilibria
Iron oxides/oxyhydroxides, namely maghemite, iron oxide-silica composite, akaganeite, and ferrihydrite, are studied for As<sup>V</sup> and As<sup>III</sup> removal from water in the pH range 2–8. All sorbents were characterized for their structural, morphological, textural, a...
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MDPI AG
2022-01-01
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| Series: | Nanomaterials |
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| Online Access: | https://www.mdpi.com/2079-4991/12/3/326 |
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| author | Marco Sanna Angotzi Valentina Mameli Alessandra Fantasia Claudio Cara Fausto Secci Stefano Enzo Marianna Gerina Carla Cannas |
| author_facet | Marco Sanna Angotzi Valentina Mameli Alessandra Fantasia Claudio Cara Fausto Secci Stefano Enzo Marianna Gerina Carla Cannas |
| author_sort | Marco Sanna Angotzi |
| collection | DOAJ |
| description | Iron oxides/oxyhydroxides, namely maghemite, iron oxide-silica composite, akaganeite, and ferrihydrite, are studied for As<sup>V</sup> and As<sup>III</sup> 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<sup>V</sup> (max 89 mg g<sup>−1</sup> at pH<sub>0</sub> 3) but to be also efficient toward As<sup>III</sup> (max 91 mg g<sup>−1</sup> at pH<sub>0</sub> 3–8), for which the best sorbent was ferrihydrite (max 144 mg g<sup>−1</sup> at pH<sub>0</sub> 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<sup>V</sup> initial concentration, contact time, ionic strength, and presence of competitors were also studied for akaganeite, the most promising remover, at pH<sub>0</sub> 3 and 8 to deepen the uptake mechanism. |
| first_indexed | 2024-03-09T23:25:56Z |
| format | Article |
| id | doaj.art-ff6d5ccd7ce24f0da24267e27951dd43 |
| institution | Directory Open Access Journal |
| issn | 2079-4991 |
| language | English |
| last_indexed | 2024-03-09T23:25:56Z |
| publishDate | 2022-01-01 |
| publisher | MDPI AG |
| record_format | Article |
| series | Nanomaterials |
| spelling | doaj.art-ff6d5ccd7ce24f0da24267e27951dd432023-11-23T17:18:55ZengMDPI AGNanomaterials2079-49912022-01-0112332610.3390/nano12030326As<sup>(III, V)</sup> Uptake from Nanostructured Iron Oxides and Oxyhydroxides: The Complex Interplay between Sorbent Surface Chemistry and Arsenic EquilibriaMarco Sanna Angotzi0Valentina Mameli1Alessandra Fantasia2Claudio Cara3Fausto Secci4Stefano Enzo5Marianna Gerina6Carla Cannas7Department of Chemical and Geological Sciences, University of Cagliari, S.S. 554 bivio per Sestu, 09042 Monserrato, ItalyDepartment of Chemical and Geological Sciences, University of Cagliari, S.S. 554 bivio per Sestu, 09042 Monserrato, ItalyDepartment of Chemical and Geological Sciences, University of Cagliari, S.S. 554 bivio per Sestu, 09042 Monserrato, ItalyDepartment of Chemical and Geological Sciences, University of Cagliari, S.S. 554 bivio per Sestu, 09042 Monserrato, ItalyDepartment of Chemical and Geological Sciences, University of Cagliari, S.S. 554 bivio per Sestu, 09042 Monserrato, ItalyDepartment of Chemistry and Pharmacy, University of Sassari, Via Vienna 2, 07100 Sassari, ItalyDepartment of Inorganic Chemistry, Charles University, Hlavova 8, 12800 Prague, Czech RepublicDepartment of Chemical and Geological Sciences, University of Cagliari, S.S. 554 bivio per Sestu, 09042 Monserrato, ItalyIron oxides/oxyhydroxides, namely maghemite, iron oxide-silica composite, akaganeite, and ferrihydrite, are studied for As<sup>V</sup> and As<sup>III</sup> 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<sup>V</sup> (max 89 mg g<sup>−1</sup> at pH<sub>0</sub> 3) but to be also efficient toward As<sup>III</sup> (max 91 mg g<sup>−1</sup> at pH<sub>0</sub> 3–8), for which the best sorbent was ferrihydrite (max 144 mg g<sup>−1</sup> at pH<sub>0</sub> 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<sup>V</sup> initial concentration, contact time, ionic strength, and presence of competitors were also studied for akaganeite, the most promising remover, at pH<sub>0</sub> 3 and 8 to deepen the uptake mechanism.https://www.mdpi.com/2079-4991/12/3/326akaganeiteferrihydritemaghemitearsenicwater remediationβ-FeOOH |
| spellingShingle | Marco Sanna Angotzi Valentina Mameli Alessandra Fantasia Claudio Cara Fausto Secci Stefano Enzo Marianna Gerina Carla Cannas As<sup>(III, V)</sup> Uptake from Nanostructured Iron Oxides and Oxyhydroxides: The Complex Interplay between Sorbent Surface Chemistry and Arsenic Equilibria Nanomaterials akaganeite ferrihydrite maghemite arsenic water remediation β-FeOOH |
| title | As<sup>(III, V)</sup> Uptake from Nanostructured Iron Oxides and Oxyhydroxides: The Complex Interplay between Sorbent Surface Chemistry and Arsenic Equilibria |
| title_full | As<sup>(III, V)</sup> Uptake from Nanostructured Iron Oxides and Oxyhydroxides: The Complex Interplay between Sorbent Surface Chemistry and Arsenic Equilibria |
| title_fullStr | As<sup>(III, V)</sup> Uptake from Nanostructured Iron Oxides and Oxyhydroxides: The Complex Interplay between Sorbent Surface Chemistry and Arsenic Equilibria |
| title_full_unstemmed | As<sup>(III, V)</sup> Uptake from Nanostructured Iron Oxides and Oxyhydroxides: The Complex Interplay between Sorbent Surface Chemistry and Arsenic Equilibria |
| title_short | As<sup>(III, V)</sup> Uptake from Nanostructured Iron Oxides and Oxyhydroxides: The Complex Interplay between Sorbent Surface Chemistry and Arsenic Equilibria |
| title_sort | as sup iii v sup uptake from nanostructured iron oxides and oxyhydroxides the complex interplay between sorbent surface chemistry and arsenic equilibria |
| topic | akaganeite ferrihydrite maghemite arsenic water remediation β-FeOOH |
| url | https://www.mdpi.com/2079-4991/12/3/326 |
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