Solubility of Iron Sulfides.

Pohl, Herbert A.

doi:10.1021/je60013a042

Cited by 16 publications

(7 citation statements)

References 15 publications

(27 reference statements)

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“…Amorphous sulfides might also be dissolved for the same reason. Pohl ( 1962 ) and Rickard ( 2006 ) showed that solubility of FeS increased with decreasing pH. Kostka and Luther III ( 1994 ) revealed that AO-buffer could dissolve amorphous sulfides in marine and saltmarsh sediments.…”

Section: Methodsmentioning

confidence: 99%

Microbially-accelerated consolidation of oil sands tailings. Pathway II: solid phase biogeochemistry

et al. 2014

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Consolidation of clay particles in aqueous tailings suspensions is a major obstacle to effective management of oil sands tailings ponds in northern Alberta, Canada. We have observed that microorganisms indigenous to the tailings ponds accelerate consolidation of mature fine tailings (MFT) during active metabolism by using two biogeochemical pathways. In Pathway I, microbes alter porewater chemistry to indirectly increase consolidation of MFT. Here, we describe Pathway II comprising significant, direct and complementary biogeochemical reactions with MFT mineral surfaces. An anaerobic microbial community comprising Bacteria (predominantly Clostridiales, Synergistaceae, and Desulfobulbaceae) and Archaea (Methanolinea/Methanoregula and Methanosaeta) transformed FeIII minerals in MFT to amorphous FeII minerals during methanogenic metabolism of an added organic substrate. Synchrotron analyses suggested that ferrihydrite (5Fe2O3. 9H2O) and goethite (α-FeOOH) were the dominant FeIII minerals in MFT. The formation of amorphous iron sulfide (FeS) and possibly green rust entrapped and masked electronegative clay surfaces in amended MFT. Both Pathways I and II reduced the surface charge potential (repulsive forces) of the clay particles in MFT, which aided aggregation of clays and formation of networks of pores, as visualized using cryo-scanning electron microscopy (SEM). These reactions facilitated the egress of porewater from MFT and increased consolidation of tailings solids. These results have large-scale implications for management and reclamation of oil sands tailings ponds, a burgeoning environmental issue for the public and government regulators.

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Section: Methodsmentioning

confidence: 99%

Microbially-accelerated consolidation of oil sands tailings. Pathway II: solid phase biogeochemistry

et al. 2014

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“…8.711 × 10 8 Loy and Himmelblau 20 8.913 × 10 8 Ringborn, Kubli, Su et al 9.124 × 10 8 Bruner and Zawadzki, Thiel and Gessner, Swift and Butler, Weast 27 9.551 × 10 8 Ellis and Golding, Harris 29 1.000 × 10 -7 Pecsok et al., Kolthoff, 32 Ellis and Giggenbach, Skoog and West 34 1.023 × 10 -7 Kubli, Konopik and Leberl, Pohl, Blackbarn 37 1.047 × 10 -7 Khodakovskii et al., 38 Berner, Goldhaber and Kaplan 39 1.071 × 10 -7 Wright and Maass, Kapustinskii 41 1.096 × 10 -7 Latimer 42 9.632 × 10 -8 average…”

Section: Solubility Of Mackinawitementioning

confidence: 99%

Equilibrium Expressions Related to the Solubility of the Sour Corrosion Product Mackinawite

Sun

Nešić

Young

et al. 2008

Ind. Eng. Chem. Res.

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A major problem in the oil and gas industry is corrosion in sour (or H2S-containing) environments. Low concentrations of H2S act to inhibit corrosion, because of the formation of a protective iron sulfide film/scale on steel surfaces; large concentrations can lead to pitting, severe localized corrosion, and catastrophic failure. Therefore, the solubility and hydrothermal stability of iron sulfides is particularly relevant to corrosion. To understand the mechanisms that are associated with the hydrothermal formation of iron sulfides, it is important to reliably estimate equilibrium constants for all the reactions involved, including those for the dissolution and dissociation of H2S. In this study, equations for determining the equilibrium constants that are related to the solubility of mackinawite are evaluated, and the most appropriate expressions are described. Also, the most relevant expressions for the solubility of H2S and for the first dissociation constant of H2S are reviewed. It is recommended that the second dissociation constant be avoided in calculations, because of the large uncertainty involved in previously reported values.

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“…Of note, both sulfur and iron sulfides exhibit extremely low solubility in aqueous electrolytes, [39][40][41] which rules out the polysulfide dissolution and shuttling. We calculated the saturation concentrations of the dissociated sulfur species from iron sulfides in water on the basis of their solubility product constants (K sp ), [39][40][41] where such solubility is negligible compared to the Li 2 S and Na 2 S counterparts (Figure 1b). [24,37] The calculation process is shown in Supporting Information.…”

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confidence: 99%

Rechargeable Iron–Sulfur Battery without Polysulfide Shuttling

Wei

Markir

et al. 2019

Advanced Energy Materials

108

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Sulfur represents one of the most promising cathode materials for next-generation batteries; however, the widely observed polysulfide dissolution/shuttling phenomenon in metal-sulfur redox chemistries has severely restricted their applications. Here it is demonstrated that when pairing the sulfur electrode with the iron metal anode, the inherent insolubility of iron sulfides renders the shuttling-free nature of the Fe-S electrochemical reactions. Consequently, the sulfur electrode exhibits promising performance for Fe 2+ storage, where a high capacity of ~1050 mAh g -1 , low polarization of ~0.16 V as well as stable cycling of 150 cycles have been realized. The Fe-S redox mechanism was further revealed as an intriguing stepwise conversion of S 8 ↔ FeS 2 ↔ Fe 3 S 4 ↔ FeS, where a low volume expansion of ~32.6% and all-solid-state phase transitions facilitate the reaction reversibility. This study suggests an alternative direction to exploit sulfur electrodes in rechargeable transition metalsulfur batteries.The pressing need for renewable energy storage entails the development of cost-effective and sustainable battery technologies. [1] Along this line, batteries that employ earth-abundant elements such Recently, our group investigated a Fe-metal battery, where a Prussian blue cathode undertakes reversible Fe 2+ (de)insertion reactions. [38] In this work, we further demonstrate Fe-S battery chemistry Received: ((will be filled in by the editorial staff))Revised: ((will be filled in by the editorial staff))

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Solubility of Iron Sulfides.

Cited by 16 publications

References 15 publications

Microbially-accelerated consolidation of oil sands tailings. Pathway II: solid phase biogeochemistry

Microbially-accelerated consolidation of oil sands tailings. Pathway II: solid phase biogeochemistry

Equilibrium Expressions Related to the Solubility of the Sour Corrosion Product Mackinawite

Rechargeable Iron–Sulfur Battery without Polysulfide Shuttling

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