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Reduction and dissolution of manganese(III) and manganese(IV) oxides by organics. 1. Reaction with hydroquinone
Abstract
The chemical processes by which manganese oxides are solubilized by reduction in anoxic waters are poorly understood. A study of the reduction and dissolution of manganese oxide suspensions by hydroquinone was undertaken to determine the rate and mechanism of the solubilization reaction. Dissolution of the manganese-(III,IV) oxide suspension by hydroquinone in the pH range 6.5 < pH < 8.5 is initially described by the following empirical rate law: \nd[Mn²⁺]/dt = k₁[H⁺]^(0.46)[QH₂]^(1.0)([MnO_x]₀[Mn²⁺]) \nwhere [Mn²⁺] is the dissolved manganese concentration, \n[QH₂] is the hydroquinone concentration, and [MnO_x]₀ is \nthe amount of manganese oxide added. The apparent activation energy was found to be at +37 kJ/mol. Calcium and phosphate inhibited the reaction, by adsorbing on the oxide surface. A model is proposed for the observed rate dependence, according to which complex formation between hydroquinone and manganese oxide surface sites occurs prior to electron transfer.
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Citations
Cited by
BIOGENIC MANGANESE OXIDES: Properties and Mechanisms of Formation
Tebo, B. M., Bargar, J. R., Clement, B. G., Dick, G. J., Murray, K. J., Parker, D., Verity, R., & Webb, S. M. (2004) · Annual Review of Earth and Planetary Sciences · doi:10.1146/annurev.earth.32.101802.120213 · Cited by 1,381
Dynamic interactions at the mineral–organic matter interface
Kleber, M., Bourg, I. C., Coward, E. K., Hansel, C. M., Myneni, S. C. B., & Nunan, N. (2021) · Nature Reviews Earth & Environment · doi:10.1038/s43017-021-00162-y · Cited by 1,254
Fredrickson, J. K., Zachara, J. M., Kennedy, D. W., Dong, H., Onstott, T. C., Hinman, N. W., & Li, S.-M. (1998) · Geochimica et Cosmochimica Acta · doi:10.1016/s0016-7037(98)00243-9 · Cited by 807
A critical review of the reactivity of manganese oxides with organic contaminants
Remucal, C. K., & Ginder-Vogel, M. (2014) · Environmental Science: Processes & Impacts · doi:10.1039/c3em00703k · Cited by 375
Oxidation of humic substances by manganese oxides yields low-molecular-weight organic substrates
Sunda, W. G., & Kieber, D. J. (1994) · Nature · doi:10.1038/367062a0 · Cited by 337
Metadata
- Authors
- Stone, A. T., & Morgan, J. J.
- Venue
- Environmental Science & Technology
- Publisher
- American Chemical Society (ACS)
- Published
- 1984-06
- Volume
- 18
- Issue
- 6
- Pages
- 450-456
- ISSN
- 0013-936X (ISSN-L)
- 1520-5851
- OpenAlex
- W2030530403
- Cited by
- 349
- References
- 0
- FWCI
- 5.34
- Type
- journal article
- Language
- en
- Open access
- closed
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- Stone, A. T., & Morgan, J. J. (1984). Reduction and dissolution of manganese(III) and manganese(IV) oxides by organics. 1. Reaction with hydroquinone. Environmental Science & Technology. https://doi.org/10.1021/es00124a011
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