Role of hydrogen peroxide and hydroxyl radical in pyrite oxidation by molecular oxygen

Schoonen, Martin A. A.; Harrington, A. D.; Laffers, Richard; Strongin, Daniel R.

doi:10.1016/j.gca.2010.05.028

Cited by 189 publications

(153 citation statements)

References 48 publications

(61 reference statements)

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“…Hydrogen peroxide is formed in the first two-electron transfer step from the pyrite surface to molecular oxygen (Schoonen et al 2010). In addition, hydrogen peroxide is formed from superoxide when dissolved ferrous iron is oxidized by molecular oxygen.…”

Section: Discussionmentioning

confidence: 99%

“…The steady state concentration of hydrogen peroxide is a balance between its formation and its decomposition. Hydrogen peroxide decomposition may either proceed via the Fenton reaction, which requires ferrous iron, or via a reaction with ferric iron producing water and oxygen (Schoonen et al 2010). Hence, the amount of iron in solution and its speciation is a key factor in determining the concentration of hydrogen peroxide in these experiments at any given time.…”

Section: Discussionmentioning

confidence: 99%

“…The presence of these patches has been established in several studies using different techniques (Bebie et al 1998;Ramprakash et al 1991). Rather than passivating the pyrite surface, the Fe(III)-OH patches are known to be the major conduits for electron transfer between molecular oxygen and pyrite (Rosso et al 1999;Jaegermann and Tributsch 1988) and are thought to play a role in the decomposition of hydrogen peroxide formed in the oxidative dissolution of pyrite (Schoonen et al 2010).…”

Section: Discussionmentioning

confidence: 99%

“…While a reaction with ferrous iron leads to the formation of hydroxyl radical, a reaction with ferric iron leads to decomposition of hydrogen peroxide into water and oxygen (reaction 7). In this respect, ferric iron acts similar to catalase (Schoonen et al 2010).…”

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confidence: 99%

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Pyrite-driven reactive oxygen species formation in simulated lung fluid: implications for coal workers’ pneumoconiosis

Harrington

Hylton

Schoonen

2011

Environ Geochem Health

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The origin of coal worker's pneumoconiosis (CWP) has been long debated. A recent epidemiological study shows a correlation between what is essentially the concentration of pyrite within coal and the prevalence of CWP in miners. Hydrogen peroxide and hydroxyl radical, both reactive oxygen species (ROS), form as byproducts of pyrite oxidative dissolution in air-saturated water. Motivated by the possible importance of ROS in the pathogenesis of CWP, we conducted an experimental study to evaluate if ROS form as byproducts in the oxidative dissolution of pyrite in simulated lung fluid (SLF) under biologically applicable conditions and to determine the persistence of pyrite in SLF. While the rate of pyrite oxidative dissolution in SLF is suppressed by 51% when compared to that in air-saturated water, the initial amount of hydrogen peroxide formed as a byproduct in SLF is nearly doubled. Hydroxyl radical is also formed in the experiments with SLF, but at lower concentrations than in the experiments with water. The formation of these ROS indicates that the reaction mechanism for pyrite oxidative dissolution in SLF is no different from that in water. The elevated hydrogen peroxide concentration in SLF suggests that the decomposition, via the Fenton mechanism to hydroxyl radical or with Fe(III) to form water and molecular oxygen, is initially inhibited by the presence of SLF components. On the basis of the oxidative dissolution rate of pyrite measured in this paper, it is calculated that a respirable two micron pyrite particle will take over 3 years to dissolve completely.

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Section: Discussionmentioning

confidence: 99%

Section: Discussionmentioning

confidence: 99%

Section: Discussionmentioning

confidence: 99%

mentioning

confidence: 99%

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Pyrite-driven reactive oxygen species formation in simulated lung fluid: implications for coal workers’ pneumoconiosis

Harrington

Hylton

Schoonen

2011

Environ Geochem Health

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“…Hydrogen peroxide and other oxidants increase the oxidation rate of minerals especially pyrite followed by dissolution of the elements. As a result, an expedited assessment of the leaching potential for mineral types and individual fractions of the mine waste can be achieved through the measurement of specific conductivity, and visual observation of effervescences (Holmes and Crundwell, 2000;Lara et al, 2015;Schoonen et al, 2010).…”

Section: Introductionmentioning

confidence: 99%

Development of an electrical conductivity screening test for mine waste assessments

2016

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Catalytic cross‐coupling of aniline by pyrite and dissolved oxygen under alkaline conditions

Yi-ying

Song

Wang

et al. 2020

Applied Organom Chemis

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Pyrite catalyzes oxidation of various organic contaminants by dissolved oxygen (DO) under acidic conditions; however, the catalytic mechanism under alkaline conditions is still not clear. In this study, we observe increased oxidation rates of aniline with increasing pHs (7.0–11.0). Electron paramagnetic resonance (EPR) analysis and quenching experiments rule out contributions of •OH, O2•−, 1O2 and Fe (IV) to aniline oxidation and suggest that the Fe (III)–OOH peroxo and/or H2O2 are the primary oxidative species in the oxidation of aniline at pH 11.0. In addition, 200 mg L−1 H2O2 does not apparently increase the oxidation rate of aniline, which also rules out the predominant contribution of the produced H2O2 to aniline oxidation. We therefore suggest that the Fe (III)–OOH peroxo is indeed the primary oxidative species in the pyrite–DO system under alkaline conditions. Analyses of solid total organic carbon (TOC), gas chromatography–mass spectrometry and Fourier‐transform infrared spectroscopy further reveal that more than 83.3% aniline has been polymerized to polyaniline, instead of being mineralized into CO2 and H2O, indicating that H‐abstraction from aniline by the Fe (III)–OOH peroxo is an important step in the oxidation of aniline under alkaline conditions. This study provides new insight into the oxidative species in the pyrite–DO system, and opens a new door for organic degradations under alkaline conditions.

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Role of hydrogen peroxide and hydroxyl radical in pyrite oxidation by molecular oxygen

Cited by 189 publications

References 48 publications

Pyrite-driven reactive oxygen species formation in simulated lung fluid: implications for coal workers’ pneumoconiosis

Pyrite-driven reactive oxygen species formation in simulated lung fluid: implications for coal workers’ pneumoconiosis

Development of an electrical conductivity screening test for mine waste assessments

Catalytic cross‐coupling of aniline by pyrite and dissolved oxygen under alkaline conditions

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