Chemical dissolution of iron substituted chromium oxide by dissolved ozone

Maroo, Sonal; Chandramohan, P.; Srinivasan, M.; Velmurugan, S.

doi:10.1016/j.pnucene.2019.103189

Cited by 6 publications

(2 citation statements)

References 10 publications

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“…Based on these results, it was determined that the optimized H 2 SO 4 concentration in the P-BED is 0.37 M for the effective dissolution performance among the experimental conditions. In addition, the above results were compared with the result of the Cr 2 O 3 dissolution test using ozone conducted by Maroo [ 21 ]. They dissolved the Cr 2 O 3 powder into the solution by injecting the ozone at 50 °C, which is the similar temperature condition of this research.…”

Section: Resultsmentioning

confidence: 99%

Behaviors of Perfluorocarbon Emulsion during Dissolution of Oxide Layers

et al. 2021

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This study investigates the dissolution behavior of oxide layers containing radionuclides using perfluorocarbon (PFC) emulsion as a reusable medium. Chemicals such as PFC, anionic surfactant, and H2SO4 are used for preparing the PFC emulsion, and emulsified using an ultrasonication process. The FTIR results show O–H stretching that is formed by the interaction of the carboxyl group of the anionic surfactant with the hydroxyl group of water containing H2SO4, and find that the H2SO4 can be homogeneously dispersed in the PFC–anionic surfactant–H2SO4 emulsion. The dissolution test of the simulated Cr2O3 specimen is conducted using PFC emulsion containing KMnO4. Through the weight losses of specimens and Scanning Electron Microscope-Energy Dispersive X-ray Spectrometer (SEM-EDS) analysis, it is confirmed that the Cr2O3 layer on the SUS304 specimen is easily dissolved using PFC emulsion. During the dissolution of the Cr2O3, it is observed that the dispersed H2SO4–KMnO4 became unstable and separated from PFC emulsion. Based on these results, the behavior of the PFC emulsion during the dissolution of the oxide layer is explained.

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Section: Resultsmentioning

confidence: 99%

Behaviors of Perfluorocarbon Emulsion during Dissolution of Oxide Layers

et al. 2021

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“…Given ozone's characteristics as an unstable gas, it was difcult for us to maintain its concentration, and it took time to achieve the desired dissolved ozone concentration. Achieving such a concentration can vary according to the temperature, pH, and other water parameters [24], and the administration time to reach the desired concentration may vary for diferent water bodies.…”

Section: Discussionmentioning

confidence: 99%

Assessment of Ozone Nanobubble Technology to Reduce Freshwater Algae

Huang

et al. 2023

Aquaculture Research

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Algal blooms can lead to low dissolved oxygen and fluctuating pH, and the toxins produced by some species can be toxic to aquatic animals. In this study, we assessed the potential of ozone nanobubble technology for reducing a diatom species, Nitzschia sp., commonly found in freshwater ponds in Hong Kong. This study suggests that ozone at a low dose of 0.025 ± 0.003 ppm was sufficient to reduce algae by 66.4% within 5 minutes of treatment. An even higher killing effect (68.2%) was observed when ozone was delivered using nanobubbles for 9 minutes. A 24-hour delayed effect was also detected, with a further reduction of approximately 10% of the algae for both ozone treatments (macro and nanobubble delivery methods). In addition to controlling algae, applying ozone at a level that is not detrimental to fish may also benefit the dissolved oxygen levels in pond systems.

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Effect of substituted cobalt–chromium–iron oxides’ dissolution kinetics in oxidizing formulation on decontamination process

Balaji,

Chandramohan,

Puspalata

et al. 2024

J Radioanal Nucl Chem

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Removing radioactive corrosion products from Cr-containing iron oxides require a multi-step and multi-cycle decontamination process. The present article brings out the effect of divalent metal ion substitution on the release rate of chromium in the oxidative pre-treatment step. The non-stoichiometric cobalt chromium ferrites were synthesized, characterized and effect of Zn2+/Ni2+ substitution on the dissolution behavior was probed. The dissolution rates decreased with increasing the degree of inclusion and showed minima at ~ 0.4–0.6 atom% which is explained on the basis of lattice structure. It is concluded that the dissolution kinetics of native nickel–chromium ferrites in reactors increases with metal ion inclusion.

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Chemical dissolution of iron substituted chromium oxide by dissolved ozone

Cited by 6 publications

References 10 publications

Behaviors of Perfluorocarbon Emulsion during Dissolution of Oxide Layers

Behaviors of Perfluorocarbon Emulsion during Dissolution of Oxide Layers

Assessment of Ozone Nanobubble Technology to Reduce Freshwater Algae

Effect of substituted cobalt–chromium–iron oxides’ dissolution kinetics in oxidizing formulation on decontamination process

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