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Cited by 88Arsenic contamination and mitigationWater Treatment and DisinfectionAdvanced oxidation water treatment

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Review of kinetics of chemical and photocatalytical oxidation of Arsenic(III) as influenced by pH

Sharma, Virender K., Dutta, Paritam K., Ray, Ajay K.·2007·Journal of Environmental Science and Health, Part A
DOI 10.1080/10934520701373034
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Abstract

The kinetics and stoichiometry of As(III) oxidation by chemical oxidants is presented. The reactions are first-order with respect to each reactant. The second-order rate constants vary with pH and have a range in magnitude of 10(4)-10(7) M-1 s-1 for free available chlorine (FAC), O3, and FeO4(2-) in a pH range of 6.0-9.0. In this pH range, the reactions of As(III) with chloroamine (NH2Cl) and H2O2 are quite slow with rate constants of 2.9-4.3x10(-1) M-1 s-1 and 2.6x10(-2)-4.5x10(1) M-1 s-1 for chloroamine and H2O2, respectively. The pH dependence of the oxidation reactions can be described using acid-base equilibria of both As(III) species and the oxidant. FAC, O3, and FeO(4)2- oxidize As(III) instantaneously at pH 7.0 with half-lives of milliseconds if 2 mg/L excess dose of oxidant is applied. One major advantage of FeO4(2-) ions over the other oxidants is its ability to remove arsenic in water by two mechanisms; it oxidizes As(III) and also subsequently coagulates As(V) through Fe(III) hydroxide produced from Fe(VI) reduction. Photocatalytic oxidation of As(III) to As(V) follows zero-order kinetics and the oxidation is completed in minutes with no significant pH dependence. The removal of dissolved arsenic to values below the World Health Organization drinking water limit of 10 microg/L can be achieved through photocatalytic oxidation of As(III) to As(V) in acidic solution followed by adsorption of As(V) onto TiO2 surfaces.

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Metadata

Authors
Sharma, V. K., Dutta, P. K., & Ray, A. K.
Affiliations
  • Florida Institute of Technology (US)
  • The University of Queensland (AU)
  • Western University (CA)
ORCID
Venue
Journal of Environmental Science and Health, Part A
Publisher
Informa UK Limited
Published
2007-05-31
Volume
42
Issue
7
Pages
997-1004
ISSN
  • 1093-4529 (ISSN-L)
  • 1532-4117
DOI
10.1080/10934520701373034
OpenAlex
W2062786133
Cited by
88
References
2
Citations by year
2026: 1 · 2025: 2 · 2024: 10 · 2023: 3 · 2022: 3 · 2021: 8 · 2020: 6 · 2019: 9 · 2018: 5 · 2017: 2 · 2016: 5 · 2015: 1 · 2014: 9 · 2013: 5 · 2012: 3
FWCI
2.63
Type
journal article
Language
en
Open access
closed
Locations
  • Journal of Environmental Science and Health Part A (publishedVersion)
  • PubMed (publishedVersion)
Topics
  • Physical Sciences › Environmental Science › Environmental Chemistry › Arsenic contamination and mitigation
  • Physical Sciences › Environmental Science › Health, Toxicology and Mutagenesis › Water Treatment and Disinfection
  • Physical Sciences › Environmental Science › Water Science and Technology › Advanced oxidation water treatment
Keywords
arsenic(III) oxidation, arsenic removal, oxidation kinetics, pH dependence, photocatalytic oxidation, permanganate, ozone, free chlorine, chloramines, hydrogen peroxide, acid-base balance, adsorption on TiO2, drinking water treatment
MeSH terms
Arsenic, Catalysis, Chloramines, Hydrogen Peroxide, Hydrogen-Ion Concentration, Kinetics, Oxidation-Reduction, Photochemistry, Water Supply, Water Purification, Iron Compounds

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CoChat. (2026). Citation check: Review of kinetics of chemical and photocatalytical oxidation of Arsenic(III) as influenced by pH. https://app.cochat.ai/papers/10.1080/10934520701373034
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Sharma, V. K., Dutta, P. K., & Ray, A. K. (2007). Review of kinetics of chemical and photocatalytical oxidation of Arsenic(III) as influenced by pH. Journal of Environmental Science and Health, Part A. https://doi.org/10.1080/10934520701373034