Perez, JPH, Freeman, HM orcid.org/0000-0001-8242-9561, Schuessler, JA et al. (1 more author) (2019) The interfacial reactivity of arsenic species with green rust sulfate (GRSO4). Science of the Total Envrionment, 648. pp. 1161-1170. ISSN 0048-9697
Abstract
Arsenic (As) contamination in groundwater is a significant health and environmental concern worldwide because of its wide distribution and toxicity. The fate and mobility of As is greatly influenced by its interaction with redox-active mineral phases, among which green rust (GR), an FeII-FeIII layered double hydroxide mineral, plays a crucial role. However, the controlling parameters of As uptake by GR are not yet fully understood. To fill this gap, we determined the interfacial reactions between GR sulfate (GRSO4) and aqueous inorganic As(III) and As(V) through batch adsorption experiments, under environmentally-relevant groundwater conditions. Our data showed that, under anoxic conditions, GRSO4 is a stable and effective mineral adsorbent for the removal of As(III) and As(V). At an initial concentration of 10 mg L−1, As(III) removal was higher at alkaline pH conditions (~95% removal at pH 9) while As(V) was more efficiently removed at near-neutral conditions (>99% at pH 7). The calculated maximum As adsorption capacities on GRSO4 were 160 mg g−1 (pH 8–9) for As(III) and 105 mg g−1 (pH 7) for As(V). The presence of other common groundwater ions such as Mg2+ and PO43− reduces the efficiency of As removal, especially at high ionic strengths. Long-term batch adsorption experiments (up to 90 days) revealed that As-interacted GRSO4 remained stable, with no mineral transformation or release of adsorbed As species. Overall, our work shows that GRSO4 is one of the most effective As adsorbents among iron (oxyhydr)oxide phases.
Metadata
Item Type: | Article |
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Authors/Creators: |
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Editors: |
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Copyright, Publisher and Additional Information: | © 2018, Elsevier B.V. All rights reserved. This is an author produced version of an article published in Science of the Total Environment. Uploaded in accordance with the publisher's self-archiving policy. |
Keywords: | Arsenic; Adsorption; Green rust; Groundwater treatment; Iron (oxyhydr) oxide; Layered double hydroxide |
Dates: |
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Institution: | The University of Leeds |
Academic Units: | The University of Leeds > Faculty of Engineering & Physical Sciences (Leeds) > School of Chemical & Process Engineering (Leeds) The University of Leeds > Faculty of Environment (Leeds) > School of Earth and Environment (Leeds) > Earth Surface Science Institute (ESSI) (Leeds) |
Depositing User: | Symplectic Publications |
Date Deposited: | 01 Jul 2019 11:11 |
Last Modified: | 13 Aug 2019 00:41 |
Status: | Published |
Publisher: | Elsevier |
Identification Number: | 10.1016/j.scitotenv.2018.08.163 |
Related URLs: | |
Open Archives Initiative ID (OAI ID): | oai:eprints.whiterose.ac.uk:147947 |
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