Molybdenum dissolution in mixtures of H2O2 and concentrated HNO3 and H2SO4 in the presence of tungsten

Guro, V. P.

doi:10.1134/s0020168508030059

Cited by 3 publications

(3 citation statements)

References 1 publication

Supporting

Mentioning

Contrasting

Order By: Relevance

“…[ 27 ] Photographs of the disassembled cells (Figure S4, Supporting Information) in the 3 m ZnSO 4 after the rate capability test clearly depicted a corroded Zn anode and a separator with blue green deposits, suggesting Mo dissolution during cell operation forming soluble molybdenum blue species. [ 28 ] These soluble Mo species subsequently migrated to the Zn anode, became reduced, and deposited on the Zn anode surface, leading to a drastic increase in R ct . In contrast, the dissolution of Mo is significantly suppressed by the WISE, as indicated by no surface deposits on the separators or Zn anode, thus contributing to a small charge transfer resistance and stable cycling.…”

Section: Resultsmentioning

confidence: 99%

Achieving Stable Molybdenum Oxide Cathodes for Aqueous Zinc‐Ion Batteries in Water‐in‐Salt Electrolyte

Wang

Yan

Quilty

et al. 2021

Adv Materials Inter

View full text Add to dashboard Cite

Layered MoO3 represents a promising cathode for aqueous rechargeable Zn‐ion batteries, but the implementation of this material is limited due to the low conductivity and poor structural stability. A 30 m ZnCl2 water‐in‐salt electrolyte (WISE) is introduced to a MoO3 nanobelt cathode for the first time, significantly increasing the stability of MoO3 cathodes compared to those in 3 m ZnSO4 and 3 m ZnCl2. The Zn/MoO3 cell in WISE unambiguously demonstrate significantly improved rate performance delivering 349, 253, and 222 mAh g−1 at 100, 500, and 1000 mA g−1, denoting a 12× capacity increase of those achieved in 3 m electrolytes at 1000 mA g−1. A capacity retention rate of 73% is achieved after (dis)charging at 100 mA g−1 for 100 cycles, and no obvious capacity fading is observed at higher current densities of 500 mA g−1 and 2 A g−1. Specifically, the data suggest that the drastic fading in 3 m electrolytes can be attributed to the parasitic surface deposits on Zn originated from Mo dissolution and H2 formation due to Zn corrosion and hydrogen evolution reaction, which are significantly suppressed in the WISE. The direct visualization of these side reactions is achieved for the first time in the Zn‐MoO3 system, using an in situ optoelectrochemical measurement.

show abstract

Section: Resultsmentioning

confidence: 99%

Achieving Stable Molybdenum Oxide Cathodes for Aqueous Zinc‐Ion Batteries in Water‐in‐Salt Electrolyte

Wang

Yan

Quilty

et al. 2021

Adv Materials Inter

View full text Add to dashboard Cite

show abstract

“…The dissolution of molybdenum in inorganic acids was also reported [22,41,42]. However, molybdenum is insoluble in HCl, H 2 SO 4 , HF, H 3 PO 4, and most other mineral acids, but it can be dissolved in HNO 3 [43].…”

Section: Introductionmentioning

confidence: 96%

“…The dissolution is fast in diluted HNO 3 and much slower in concentrated HNO 3 due to the formation of inert oxide film on the metal surface, making it difficult to dissolve. Guro et al [41] studied in detail the hydrogen peroxide oxidation of molybdenum and its subsequent dissolution in concentrated nitric and sulfuric acids. They demonstrated that the dissolution of metallic molybdenum in hydrogen peroxide is based on the phenomenon of corrosion and corrosion inhibition, and the oxidation of molybdenum and associated reduction of the hydrogen peroxide is accompanied by heterogeneous catalytic hydrogen peroxide decomposition and oxygen release.…”

Section: Introductionmentioning

confidence: 99%

Studies on electrochemical dissolution of sintered molybdenum discs as a potential method for targets dissolution in 99mTc production

Cieszykowska

Jerzyk

Żółtowska

et al. 2021

J Radioanal Nucl Chem

View full text Add to dashboard Cite

Electrochemical dissolution of pressed into discs and sintered metallic molybdenum powder with the mass of 712 ± 10 mg (n = 15) in potassium hydroxide solution was studied in detail. The technique was considered to apply for dissolution of irradiated 100Mo target in the 99mTc production. The effect of various parameters, e.g., the concentration of the electrolyte solution, temperature, current density, and surface area of the platinum cathode, was investigated. The shortest time for total dissolution of molybdenum target was 70 min. This result was achieved using an electrolyte solution of 5 M KOH, temperature 55 °C and the current density of 365 mA/cm2.

show abstract

Dissolution of Molybdenum in Hydrogen Peroxide: A Thermodynamic, Kinetic and Microscopic Study of a Green Process for 99mTc Production

et al. 2023

View full text Add to dashboard Cite

99mTc-based radiopharmaceuticals are the most commonly used medical radioactive tracers in nuclear medicine for diagnostic imaging. Due to the expected global shortage of 99Mo, the parent radionuclide from which 99mTc is produced, new production methods should be developed. The SORGENTINA-RF (SRF) project aims at developing a prototypical medium-intensity D-T 14-MeV fusion neutron source specifically designed for production of medical radioisotopes with a focus on 99Mo. The scope of this work was to develop an efficient, cost-effective and green procedure for dissolution of solid molybdenum in hydrogen peroxide solutions compatible for 99mTc production via the SRF neutron source. The dissolution process was extensively studied for two different target geometries: pellets and powder. The first showed better characteristics and properties for the dissolution procedure, and up to 100 g of pellets were successfully dissolved in 250–280 min. The dissolution mechanism on the pellets was investigated by means of scanning electron microscopy and energy-dispersive X-ray spectroscopy. After the procedure, sodium molybdate crystals were characterized via X-ray diffraction, Raman and infrared spectroscopy and the high purity of the compound was established by means of inductively coupled plasma mass spectroscopy. The study confirmed the feasibility of the procedure for production of 99mTc in SRF as it is very cost-effective, with minimal consumption of peroxide and controlled low temperature.

show abstract

Molybdenum dissolution in mixtures of H2O2 and concentrated HNO3 and H2SO4 in the presence of tungsten

Cited by 3 publications

References 1 publication

Achieving Stable Molybdenum Oxide Cathodes for Aqueous Zinc‐Ion Batteries in Water‐in‐Salt Electrolyte

Achieving Stable Molybdenum Oxide Cathodes for Aqueous Zinc‐Ion Batteries in Water‐in‐Salt Electrolyte

Studies on electrochemical dissolution of sintered molybdenum discs as a potential method for targets dissolution in 99mTc production

Dissolution of Molybdenum in Hydrogen Peroxide: A Thermodynamic, Kinetic and Microscopic Study of a Green Process for 99mTc Production

Contact Info

Product

Resources

About