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Arsenic(III) Oxidation by Iron(VI) (Ferrate) and Subsequent Removal of Arsenic(V) by Iron(III) Coagulation
Abstract
We investigated the stoichiometry, kinetics, and mechanism of arsenite [As(III)] oxidation by ferrate [Fe(VI)] and performed arsenic removal tests using Fe(VI) as both an oxidant and a coagulant. As(III) was oxidized to As(V) (arsenate) by Fe(VI), with a stoichiometry of 3:2 [As(III):Fe(VI)]. Kinetic studies showed that the reaction of As(III) with Fe(VI) was first-order with respect to both reactants, and its observed second-order rate constant at 25 degrees C decreased nonlinearly from (3.54 +/- 0.24) x 10(5) to (1.23 +/- 0.01) x 10(3) M(-1) s(-1) with an increase of pH from 8.4 to 12.9. A reaction mechanism by oxygen transfer has been proposed for the oxidation of As(III) by Fe(VI). Arsenic removal tests with river water showed that, with minimum 2.0 mg L(-1) Fe(VI), the arsenic concentration can be lowered from an initial 517 to below 50 microg L(-1), which is the regulation level for As in Bangladesh. From this result, Fe(VI) was demonstrated to be very effective in the removal of arsenic species from water at a relatively low dose level (2.0 mg L(-1)). In addition, the combined use of a small amount of Fe(VI) (below 0.5 mg L(-1)) and Fe(III) as a major coagulant was found to be a practical and effective method for arsenic removal.
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“Microbial contamination is also another limitation [138, 139] which can be avoided by discarding the rainwater collected from first flush [9].”
From Arsenic Contamination of Groundwater: A Review of Sources, Prevalence, Health Risks, and Strategies for Mitigation (2014) · cites this paper as [138]
In the citing paper
“In these areas, rainwater is preserved in large ponds, [138] and the experience from such areas can be transferred to other As affected areas.”
From Arsenic Contamination of Groundwater: A Review of Sources, Prevalence, Health Risks, and Strategies for Mitigation (2014) · cites this paper as [138]
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Metadata
- Authors
- Lee, Y., Um, I.-H., & Yoon, J.
- Affiliations
- Ewha Womans University (KR)
- Venue
- Environmental Science & Technology
- Publisher
- American Chemical Society (ACS)
- Published
- 2003-11-12
- Volume
- 37
- Issue
- 24
- Pages
- 5750-5756
- ISSN
- 0013-936X (ISSN-L)
- 1520-5851
- OpenAlex
- W2058079588
- Cited by
- 299
- References
- 41
- Citations by year
- 2026: 1 · 2025: 9 · 2024: 7 · 2023: 16 · 2022: 14 · 2021: 23 · 2020: 22 · 2019: 20 · 2018: 17 · 2017: 11 · 2016: 20 · 2015: 12 · 2014: 21 · 2013: 11 · 2012: 9
- FWCI
- 3.47
- Type
- journal article
- Language
- en
- Open access
- closed
- Locations
- Environmental Science & Technology (publishedVersion)
- PubMed (publishedVersion)
- Topics
- Physical Sciences › Environmental Science › Environmental Chemistry › Arsenic contamination and mitigation
- Physical Sciences › Environmental Science › Water Science and Technology › Advanced oxidation water treatment
- Physical Sciences › Environmental Science › Water Science and Technology › Coagulation and Flocculation Studies
- Keywords
- arsenite oxidation, ferrate, arsenate removal, arsenic removal from water, reaction kinetics, oxygen transfer mechanism, pH effect on oxidation, river water treatment
- MeSH terms
- Arsenic, Bangladesh, Environmental Monitoring, Iron, Kinetics, Oxidation-Reduction, Water Pollutants, Water Purification
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