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AN INVESTIGATION OF ARSENATE AND ARSENITE BONDING STRUCTURES ON GOETHITE BY FTIR
Abstract
The bonding structures of arsenite (As(III)) and arsenate (As(V)) on goethite (α-FeOOH) were studied by Transmission-Fourier Transform Infrared (T-FTIR) and Attenuated Total Reflectance-FTIR (ATR-FTIR) spectroscopy. ATR-FTIR spectra of deuterated goethite showed three bands of OD stretch, corresponding to singly, doubly, and triply coordinated OH hydroxyls on the goethite surface. Both FTIR modes provided similar structural information for arsenic adsorption. Most arsenate and arsenite oxyanions replaced two singly coordinated surface OH groups (A-type) to form binuclear bridging complexes Fe-O-AsO(OH)-O-Fe and Fe-O-As(OH)-O-Fe. However, their effects on doubly (C-type) and triply (B-type) coordinated surface OH groups are different. As(III) mainly reacted with C-type OH groups, whereas As(V) reacted with B-type OH groups. These reactions may be attributed to hydrogen-bonding and/or chemical bonding. Finally, we applied a sequential extraction method to evaluate the fractions with different bonding strengths. Relatively strong chemical extraction was necessary to remove 75 to 80% of adsorbed arsenite or arsenate from goethite. The strong retention of As(III) and As(V) is most likely caused by the formation of binuclear complexes with goethite.
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Sun and Doner demonstrated that oxidation of sorbed As(III) to As(V) on Fe-oxides may occur to a limited (about 20%) extent.
“Sun and Doner [29] demonstrated that oxidation of sorbed As(III) to As(V) on Fe-oxides may occur to a limited (about 20 %) extent.”
From Chemical Processes Affecting the Mobility of Heavy Metals and Metalloids in Soil Environments (2016) · cites this paper as [29]
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Metadata
- Authors
- Sun, X., & Doner, H. E.
- Affiliations
- University of California, Berkeley (US)
- ORCID
- Sun, Xiaohua
- Venue
- Soil Science
- Published
- 1996-12
- Volume
- 161
- Issue
- 12
- Pages
- 865-872
- ISSN
- 0038-075X (ISSN-L)
- OpenAlex
- W2334317903
- Cited by
- 329
- References
- 24
- Citations by year
- 2026: 3 · 2025: 7 · 2024: 5 · 2023: 9 · 2022: 5 · 2021: 5 · 2020: 7 · 2019: 14 · 2018: 10 · 2017: 8 · 2016: 9 · 2015: 10 · 2014: 14 · 2013: 11 · 2012: 12
- FWCI
- 5.14
- Type
- journal article
- Language
- en
- Open access
- closed
- Locations
- Soil Science (publishedVersion)
- Topics
- Physical Sciences › Environmental Science › Environmental Chemistry › Arsenic contamination and mitigation
- Physical Sciences › Environmental Science › Water Science and Technology › Environmental and Analytical Chemistry Studies
- Physical Sciences › Environmental Science › Pollution › Heavy metals in environment
- Keywords
- arsenite, arsenate, goethite, arsenic adsorption, surface hydroxyl groups, arsenic speciation, hydrogen bonding, sequential extraction, iron oxyhydroxide
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