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Reactive oxygen species and associated reactivity of peroxymonosulfate activated by soluble iron species.
J Contam Hydrol. 2017 10; 205:70-77.JC

Abstract

The activation of peroxymonosulfate by iron (II), iron (III), and iron (III)-EDTA for in situ chemical oxidation (ISCO) was compared using nitrobenzene as a hydroxyl radical probe, anisole as a hydroxyl radical+sulfate radical probe, and hexachloroethane as a reductant+nucleophile probe. In addition, activated peroxymonosulfate was investigated for the treatment of the model groundwater contaminants perchloroethylene (PCE) and trichloroethylene (TCE). The relative activities of hydroxyl radical and sulfate radical in the degradation of the probe compounds and PCE and TCE were isolated using the radical scavengers tert-butanol and isopropanol. Iron (II), iron (III), and iron (III)-EDTA effectively activated peroxymonosulfate to generate hydroxyl radical and sulfate radical, but only a minimal flux of reductants or nucleophiles. Iron (III)-EDTA was a more effective activator than iron (II) and iron (III), and also provided a non-hydroxyl radical, non-sulfate radical degradation pathway. The contribution of sulfate radical relative to hydroxyl radical followed the order of anisole>>TCE>PCE >>nitrobenzene; i.e., sulfate radical was less dominant in the oxidation of more oxidized target compounds. Sulfate radical is often assumed to be the primary oxidant in activated peroxymonosulfate and persulfate systems, but the results of this research demonstrate that the reactivity of sulfate radical with the target compound must be considered before drawing such a conclusion.

Authors+Show Affiliations

Department of Civil and Environmental Engineering, Washington State University, Pullman, WA 99164-2910, United States.Department of Civil and Environmental Engineering, Washington State University, Pullman, WA 99164-2910, United States.Department of Civil and Environmental Engineering, Washington State University, Pullman, WA 99164-2910, United States. Electronic address: amy_teel@wsu.edu.

Pub Type(s)

Journal Article

Language

eng

PubMed ID

28918966

Citation

Watts, Richard J., et al. "Reactive Oxygen Species and Associated Reactivity of Peroxymonosulfate Activated By Soluble Iron Species." Journal of Contaminant Hydrology, vol. 205, 2017, pp. 70-77.
Watts RJ, Yu M, Teel AL. Reactive oxygen species and associated reactivity of peroxymonosulfate activated by soluble iron species. J Contam Hydrol. 2017;205:70-77.
Watts, R. J., Yu, M., & Teel, A. L. (2017). Reactive oxygen species and associated reactivity of peroxymonosulfate activated by soluble iron species. Journal of Contaminant Hydrology, 205, 70-77. https://doi.org/10.1016/j.jconhyd.2017.09.001
Watts RJ, Yu M, Teel AL. Reactive Oxygen Species and Associated Reactivity of Peroxymonosulfate Activated By Soluble Iron Species. J Contam Hydrol. 2017;205:70-77. PubMed PMID: 28918966.
* Article titles in AMA citation format should be in sentence-case
TY - JOUR T1 - Reactive oxygen species and associated reactivity of peroxymonosulfate activated by soluble iron species. AU - Watts,Richard J, AU - Yu,Miao, AU - Teel,Amy L, Y1 - 2017/09/08/ PY - 2017/06/28/received PY - 2017/08/30/revised PY - 2017/09/07/accepted PY - 2017/9/19/pubmed PY - 2018/1/9/medline PY - 2017/9/19/entrez KW - Chelated iron KW - Hydroxyl radical KW - In situ chemical oxidation KW - Peroxymonosulfate KW - Soluble iron KW - Sulfate radical SP - 70 EP - 77 JF - Journal of contaminant hydrology JO - J Contam Hydrol VL - 205 N2 - The activation of peroxymonosulfate by iron (II), iron (III), and iron (III)-EDTA for in situ chemical oxidation (ISCO) was compared using nitrobenzene as a hydroxyl radical probe, anisole as a hydroxyl radical+sulfate radical probe, and hexachloroethane as a reductant+nucleophile probe. In addition, activated peroxymonosulfate was investigated for the treatment of the model groundwater contaminants perchloroethylene (PCE) and trichloroethylene (TCE). The relative activities of hydroxyl radical and sulfate radical in the degradation of the probe compounds and PCE and TCE were isolated using the radical scavengers tert-butanol and isopropanol. Iron (II), iron (III), and iron (III)-EDTA effectively activated peroxymonosulfate to generate hydroxyl radical and sulfate radical, but only a minimal flux of reductants or nucleophiles. Iron (III)-EDTA was a more effective activator than iron (II) and iron (III), and also provided a non-hydroxyl radical, non-sulfate radical degradation pathway. The contribution of sulfate radical relative to hydroxyl radical followed the order of anisole>>TCE>PCE >>nitrobenzene; i.e., sulfate radical was less dominant in the oxidation of more oxidized target compounds. Sulfate radical is often assumed to be the primary oxidant in activated peroxymonosulfate and persulfate systems, but the results of this research demonstrate that the reactivity of sulfate radical with the target compound must be considered before drawing such a conclusion. SN - 1873-6009 UR - https://www.unboundmedicine.com/medline/citation/28918966/Reactive_oxygen_species_and_associated_reactivity_of_peroxymonosulfate_activated_by_soluble_iron_species_ L2 - https://linkinghub.elsevier.com/retrieve/pii/S0169-7722(17)30198-5 DB - PRIME DP - Unbound Medicine ER -