Technology of groundwater quality prediction: 1. Eh-pH diagram and detention coefficient of molybdenum and tungsten in aqueous solutions

Ryzhenko, B. N.

doi:10.1134/s0016702910040105

Cited by 11 publications

(5 citation statements)

References 5 publications

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“…200, 204, 206–209 A 2D material is thermodynamically able to undergo oxidation in aerobic biological environments if its φ ox value is lower (more negative) than that of the oxygen/water redox couple φ (O 2 /H 2 O) , and Fig. 7c shows that such oxidation is thermodynamically favorable for TMD materials.…”

Section: Fundamental Modes Of Biological Interactionmentioning

confidence: 99%

“…This defines the thermodynamic oxidation potential j ox and reduction potential j re , which can be obtained from published thermodynamic data. 200,204,[206][207][208][209] A 2D material is thermodynamically able to undergo oxidation in aerobic biological environments if its j ox value is lower (more negative) than that of the oxygen/water redox couple j(O 2 /H 2 O), and Fig. 7c shows that such oxidation is thermodynamically favorable for TMD materials.…”

Section: Chemical Interactions and Materials Phase Transformationsmentioning

confidence: 99%

See 1 more Smart Citation

Biological and environmental interactions of emerging two-dimensional nanomaterials

Wang¹,

Zhu²,

Qiu³

et al. 2016

Chem. Soc. Rev.

241

210

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Two-dimensional materials have become a major focus in materials chemistry research worldwide with substantial efforts centered on synthesis, property characterization, and technological application. These high-aspect ratio sheet-like solids come in a wide array of chemical compositions, crystal phases, and physical forms, and are anticipated to enable a host of future technologies in areas that include electronics, sensors, coatings, barriers, energy storage and conversion, and biomedicine. A parallel effort has begun to understand the biological and environmental interactions of synthetic nanosheets, both to enable the biomedical developments and to ensure human health and safety for all application fields. This review covers the most recent literature on the biological responses to 2D materials and also draws from older literature on natural lamellar minerals to provide additional insight into the essential chemical behaviors. The article proposes a framework for more systematic investigation of biological behavior in the future, rooted in fundamental materials chemistry and physics. That framework considers three fundamental interaction modes: (i) chemical interactions and phase transformations, (ii) electronic and surface redox interactions, and (iii) physical and mechanical interactions that are unique to near-atomically-thin, high-aspect-ratio solids. Two-dimensional materials are shown to exhibit a wide range of behaviors, which reflect the diversity in their chemical compositions, and many are expected to undergo reactive dissolution processes that will be key to understanding their behaviors and interpreting biological response data. The review concludes with a series of recommendations for high-priority research subtopics at the “bio-nanosheet” interface that we hope will enable safe and successful development of technologies related to two-dimensional nanomaterials.

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Section: Fundamental Modes Of Biological Interactionmentioning

confidence: 99%

Section: Chemical Interactions and Materials Phase Transformationsmentioning

confidence: 99%

Biological and environmental interactions of emerging two-dimensional nanomaterials

Wang¹,

Zhu²,

Qiu³

et al. 2016

Chem. Soc. Rev.

241

210

View full text Add to dashboard Cite

show abstract

“…The MoO 2 and MoO 3 solubility models contain some uncertainty due to unavailability of published R-HKF parameters and inconsistencies in reported thermodynamic properties for H 2 MoO 4(aq) , the most abundant aqueous-phase Mo-containing species. We took the thermodynamic properties for H 2 MoO 4(aq) from several sources, − and the R-HKF parameters were either fitted from experimental equilibrium data or correlated . In addition, the present model does not include other potential aqueous species such as MoO 3 ·(H 2 O) 2(aq) and MoO 3 ·(H 2 O) n (aq) of higher hydration numbers.…”

Section: Resultsmentioning

confidence: 99%

Catalyst Oxidation and Dissolution in Supercritical Water

2018

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We use thermodynamic models to predict catalyst oxidation and dissolution in supercritical water (SCW) and use experiments to assess the viability of the models for practical SCW reaction systems and provide relative rates for these mechanisms. We examined the oxidation and dissolution of noble and transition metals, metal oxide catalyst supports, and transition metal carbides and nitrides under SCW conditions. The materials were tested in batch reactors at 400 °C for 60 min, and the SCW density was varied from 0 to 0.5 g/mL to observe the influence of the solvent properties on stability. Oxidation and dissolution were determined by comparing the initial catalyst composition and structure with those of the catalysts recovered from the reactors after exposure to the SCW environment. The gas-phase recovered from the reactors was analyzed for H2 produced from oxidation. The aqueous phase was analyzed for metals from dissolution. The ΔG rxn for oxidation and the solubility of the catalysts in SCW at the experimental conditions were calculated for comparison. Overall, the thermodynamic calculations agreed with the experimentally observed oxidation and dissolution. We conclude that thermodynamic modeling is an effective tool for efficiently screening the stability of catalytic materials in SCW and for estimating long-term hydrothermal catalyst stability.

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“…MoS − ) which are stable when the pH is near neutral and alkaline values [51]. A study of Mo speciation in anaerobic, weakly sulphidic ([H2S] < 11 μΜ) natural waters [52] has reported that the molybdate sulphidation reaction is faster at a lower pH; at a pH of 6.24, the reaction went nearly to completion in less than three days, whereas at a pH of 8.96 little to no while each successive sulphidation reaction is one order of magnitude slower than the previous one.…”

Section: Mo Speciationmentioning

confidence: 99%

Immobilisation of Molybdenum in a Sulphate-Reducing Bioreactor

Kousi,

Strongyli,

Tsakiridis

et al. 2023

Separations

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This work presents a biological remediation process for molybdenum-bearing wastewater which may lead to the fabrication of biogenic Mo chalcogenide particles with (photo)catalytic properties. The process is based on dissimilatory sulphate reduction, utilising sulphate-reducing bacteria (SRB), and reductive precipitation of molybdate which is the predominant species of molybdenum in oxygenated water/wastewater. The SRB culture was established in a biofilm reactor which was fed with synthetic solutions containing sulphate (17.7 mM), molybdate molybdenum (2 mM), divalent iron (1.7 mM) and ethanol as the carbon/electron donor. The performance of the bioreactor was monitored in terms of pH, sulphate and molybdenum (Mo(VI) and total) content. The presence of thiomolybdate species was studied by scanning UV-Vis absorbance of samples from the reactor outflow while the reactor precipitates were studied via electron microscopy coupled with energy dispersive spectrometry, X-ray diffractometry and laser light scattering. A molar molybdate/sulphate ratio of 1:12.5 proved effective for molybdate reduction and recovery by 76% in 96 h, whereas sulphate was reduced by 57%. Molybdenum was immobilised in the sulphidic precipitates of the bioreactor, presumably via two principal mechanisms: (i) microbially mediated reduction and precipitation, and (ii) thiomolybdate formation and sorption/incorporation into iron sulphides.

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Technology of groundwater quality prediction: 1. Eh-pH diagram and detention coefficient of molybdenum and tungsten in aqueous solutions

Cited by 11 publications

References 5 publications

Biological and environmental interactions of emerging two-dimensional nanomaterials

Biological and environmental interactions of emerging two-dimensional nanomaterials

Catalyst Oxidation and Dissolution in Supercritical Water

Immobilisation of Molybdenum in a Sulphate-Reducing Bioreactor

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