Surface structure-dependent pyrite oxidation in relatively dry and moist air: Implications for the reaction mechanism and sulfur evolution

Zhu, Jianxi; Huang, Xian; Lin, Xiaoju; Hong-mei, Tang; Du, Runxiang; Yang, Yiping; Zhu, Runliang; Wei, Jingming; Teng, Hsisheng; He, Hongping

doi:10.1016/j.gca.2018.02.050

Cited by 82 publications

(41 citation statements)

References 59 publications

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“…According to Descostes et al, when pyrite is dissolved in acid solution with O 2 as an oxidant, S has two main species: thiosulfate (

S_{2} O_{3}^{2 -}

) and sulfate (

{SO}_{4}^{2 -}

), and occasionally sulfite (

{SO}_{3}^{2 -}

). Figure shows the oxidation mechanism of pyrite in the presence of oxygen reported by Zhu . It is shown that the O atom in

{SO}_{3}^{2 -}

S_{2} O_{3}^{2 -}

only comes from H 2 O.…”

Section: Pyrite Oxidationmentioning

confidence: 92%

“…Although thiosulfate was a more stable intermediate, it ultimately turned into sulfate. The oxidation behavior of naturally existing (100), (111), and (210) surfaces of pyrite was investigated in different air humidity by Zhu, where the initial oxidation rates of both pyrite (111) and (210) were much greater than that of pyrite (100). At low air humidity, the initial oxidation rate of pyrite (210) is faster than that of pyrite (111), and it has opposite result at high air humidity.…”

Section: Pyrite Oxidationmentioning

confidence: 99%

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Pyrite oxidation mechanism in aqueous medium

Feng

Tian

Huang

et al. 2019

J Chinese Chemical Soc

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The mineral pyrite is considered the most common form of the sulfide minerals. Its oxidation is a very important process in nature, which involves in the redox recycling of iron. However, because of the growing need for the industrial production, sulfide oxidation produces more and more acid mine (or rock) drainage. This acid drainage has become a heavy economic and environmental problem. This review describes the oxidation mechanism of pyrite in an aqueous medium, including general oxidation and microbial oxidation, where sulfate, ferrous ion, S0, polysulfides, iron[III], and some intermediate species are formed. Also included is recent evidence on the electrochemical oxidation determined using the electrochemical method, X‐ray photoelectron spectroscopy (XPS), Raman spectroscopy, Fourier transform infrared spectroscopy (FTIR), and other techniques. In addition, the factors that influence the oxidation and dissolution rate, and the descriptive approaches for different species are discussed.

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“…According to Descostes et al, when pyrite is dissolved in acid solution with O 2 as an oxidant, S has two main species: thiosulfate (

S_{2} O_{3}^{2 -}

) and sulfate (

{SO}_{4}^{2 -}

), and occasionally sulfite (

{SO}_{3}^{2 -}

). Figure shows the oxidation mechanism of pyrite in the presence of oxygen reported by Zhu . It is shown that the O atom in

{SO}_{3}^{2 -}

S_{2} O_{3}^{2 -}

only comes from H 2 O.…”

Section: Pyrite Oxidationmentioning

confidence: 92%

Section: Pyrite Oxidationmentioning

confidence: 99%

Pyrite oxidation mechanism in aqueous medium

Feng

Tian

Huang

et al. 2019

J Chinese Chemical Soc

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“…The Figure 7b shows that the two main peaks located at 162.4 eV and 163.6 eV appeared to be from S 2p spin-orbit doublet (S 2p3/2 and S 2p1/2, respectively), with a splitting of 1.19 eV. The spectra contain the main peak at 162.4 eV, and the weak shoulder peak at 161.4 eV, which can be ascribed to disulfide (S2 2− ) and monosulfide (S 2− ) species, respectively [46][47][48]. The distribution of sulfur species on pyrite (1 0 0) surface (Table 7) shows that the percentages of monosulfide and disulfide are 10.9% and 89.1% (atomic percent), respectively.…”

Section: X-ray Photoelectron Spectroscopy Analysis Of Pyrite (1 0 0) mentioning

confidence: 99%

Combined DFT and XPS Investigation of Cysteine Adsorption on the Pyrite (1 0 0) Surface

et al. 2018

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Abstract:The adsorption of cysteine on the pyrite (1 0 0) surface was evaluated by using first-principles-based density functional theory (DFT) and X-ray photoelectron spectroscopy (XPS) measurements. The frontier orbitals analyses indicate that the interaction of cysteine and pyrite mainly occurs between HOMO of cysteine and LUMO of pyrite. The adsorption energy calculation shows that the configuration of the -OH of -COOH adsorbed on the Fe site is the thermodynamically preferred adsorption configuration, and it is the strongest ionic bond according to the Mulliken bond populations. As for Fe site mode, the electrons are found transferred from cysteine to Fe of pyrite (1 0 0) surface, while there is little or no electron transfer for S site mode. Projected density of states (PDOS) is analyzed further in order to clarify the interaction mechanism between cysteine and the pyrite (1 0 0) surface. After that, the presence of cysteine adsorption on the pyrite (1 0 0) surface is indicated by the qualitative results of the XPS spectra. This study provides an alternative way to enhance the knowledge of microbe-mineral interactions and find a route to improve the rate of bioleaching.

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“…As described in the Results section, microtextural features of Type I and II aggregates point out that they are the results of the replacement by Fe oxides of former pyrite framboids. Zhu et al (2018) have studied the dependence of pyrite oxidation on surface structure and deduced that {111} (octahedra) is the most sensitive facet for pyrite oxidation. Pyrite framboids can be…”

Section: Type I and Ii Aggregatesmentioning

confidence: 99%

Fe-rich microspheres pseudomorphs after pyrite framboids in Holocene fluvial deposits from NE Spain: Relationship with environmental conditions and bacterial activity

Mayayo

Yuste

Luzón

et al. 2019

Sedimentary Geology

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Three iron oxides-rich microsphere types (Type I to III) were detected in an Holocene 17 mthick stratigraphic succession located in the Iberian Range (NE Spain). Lithofacies features indicate that the studied materials were generated in an alluvial-dominated setting, with a channeled area fringed by floodplain zones. During high water levels and high-energy floods, gravels and sands deposited in the active area and in lateral overbank areas. In these lateral areas, mud settling took place when flood decreased and then anoxic conditions could be reached due to microbial oxidation of organic matter and the low permeability of the marly sediment. X-ray diffraction (XRD) analysis of 32 samples and microtextural observation of 10 samples by Field Emission Scanning Electron Microscopy (FESEM) revealed the occurrence of Fe oxi-hydroxides microspheres showing different surficial structure. These microspheres are pseudomorphs after pyrite framboids although the formation of some primary Fe oxyhydroxides aggregates cannot be rejected. Pyrite framboids genesis in sediments underlying oxic-dysoxic water column would have been favored by anoxic conditions reached in lateral overbank areas after main flooding, involving the activity of Fe reducing bacteria and sulfatereducing bacteria (SRB), given the high SO 4 = availability provided by the highly mineralized groundwater from the upstream Baños de Ariño spring. Subsequent change to oxic conditions

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Surface structure-dependent pyrite oxidation in relatively dry and moist air: Implications for the reaction mechanism and sulfur evolution

Cited by 82 publications

References 59 publications

Pyrite oxidation mechanism in aqueous medium

Pyrite oxidation mechanism in aqueous medium

Combined DFT and XPS Investigation of Cysteine Adsorption on the Pyrite (1 0 0) Surface

Fe-rich microspheres pseudomorphs after pyrite framboids in Holocene fluvial deposits from NE Spain: Relationship with environmental conditions and bacterial activity

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