The DOI matches its Crossref record; 1 of the 1 references it cites were found in a registry or an index.
Mechanisms of Sb(III) Oxidation by Pyrite-Induced Hydroxyl Radicals and Hydrogen Peroxide
Abstract
Antimony (Sb) is an element of growing interest, and its toxicity and mobility are strongly influenced by redox processes. Sb(III) oxidation mechanisms in pyrite suspensions were comprehensively investigated by kinetic measurements in oxic and anoxic conditions and simulated sunlight. Sb(III) was oxidized to Sb(V) in both solution and on pyrite surfaces in oxic conditions; the oxidation efficiency of Sb(III) was gradually enhanced with the increase of pH. The pyrite-induced hydroxyl radical (·OH) and hydrogen peroxide (H2O2) are the oxidants for Sb(III) oxidation. ·OH is the oxidant for Sb(III) oxidation in acidic solutions, and H2O2 becomes the main oxidant in neutral and alkaline solutions. ·OH and H2O2 can be generated by the reaction of previously existing FeIII(pyrite) and H2O on pyrite in anoxic conditions. The oxygen molecule is the crucial factor in continuously producing ·OH and H2O2 for Sb(III) oxidation. The efficiency of Sb(III) oxidation was enhanced in surface-oxidized pyrite (SOP) suspension, more ·OH formed through Fenton reaction in acidic solutions, but Fe(IV) and H2O2 were formed in neutral and alkaline solutions. Under the illumination of simulated sunlight, more ·OH and H2O2 were produced in the pyrite suspension, and the oxidation efficiency of Sb(III) was remarkably enhanced. In conclusion, Sb(III) can be oxidized to Sb(V) in the presence of pyrite, which will greatly influence the fate of Sb(III) in the environment.
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Cites
Buxton, G. V., Greenstock, C. L., Helman, W. P., & Ross, A. B. (1988) · Journal of Physical and Chemical Reference Data · doi:10.1063/1.555805 · Cited by 12,332
Cited by
He, M., Wang, N., Long, X., Zhang, C., Ma, C., Zhong, Q., Wang, A., Wang, Y., Pervaiz, A., & Shan, J. (2019) · Journal of Environmental Sciences · doi:10.1016/j.jes.2018.05.023 · Cited by 498
Self-citationMechanisms of hydroxyl radical production from abiotic oxidation of pyrite under acidic conditions
Zhang, P., Yuan, S., & Liao, P. (2016) · Geochimica et Cosmochimica Acta · doi:10.1016/j.gca.2015.10.015 · Cited by 307
Liang, W., Wang, G., Peng, C., Tan, J., Wan, J., Sun, P., Li, Q., Ji, X., Zhang, Q., Wu, Y., et al. (2022) · Journal of Hazardous Materials · doi:10.1016/j.jhazmat.2021.127993 · Cited by 264
Cheng, D., Yuan, S., Liao, P., & Zhang, P. (2016) · Environmental Science & Technology · doi:10.1021/acs.est.6b02833 · Cited by 263
Metadata
- Authors
- Kong, L., Hu, X., & He, M.
- Venue
- Environmental Science & Technology
- Publisher
- American Chemical Society (ACS)
- Published
- 2015-03-04
- Volume
- 49
- Issue
- 6
- Pages
- 3499-3505
- ISSN
- 0013-936X (ISSN-L)
- 1520-5851
- OpenAlex
- W2318285751
- Cited by
- 223
- References
- 1
- FWCI
- 4.56
- Type
- journal article
- Language
- en
- Open access
- closed
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