Sorption of niobium on colloidal silica and the effect of humic acid

Ghosh, Madhusudan; Devi, Pooja; Verma, Rakesh Kumar; Reddy, Α. V. R.

doi:10.1007/s10967-015-4055-z

Cited by 10 publications

(2 citation statements)

References 13 publications

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“…The sorption studies of Nb on various materials like silica/glass surface, iron oxides, manganese dioxides and cement have been reported but detailed investigation regarding the sorption mechanism is not available (Ghosh et al 2015(Ghosh et al , 2017(Ghosh et al , 2019Wies et al 1987;Nese et al 2022;Yamaguchi et al 2020). The understanding of the sorption mechanism helps in accessing the migration probability in natural aquatic conditions.…”

Section: Introductionmentioning

confidence: 99%

Sorption of long-lived 94Nb on magnetite: spectroscopic and electrochemical investigation of the associated mechanism

Ghosh

Yadav

Debnath

et al. 2023

J Radioanal Nucl Chem

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94 Nb is a long-lived radioisotope generated upon neutron irradiation of Zr-Nb pressure tube in natural uranium fueled pressurized heavy water reactors (PHWR). The discharged pressure tubes are generally stored in deep tile holes with a concrete cap. Contact of ground water with radioactive waste may lead to leaching and migration of 94 Nb, which may create long-term radiological impact. Therefore, a sorption study of 94 Nb on magnetite was carried out in the pH range of 1-10, both in aerobic and anaerobic conditions to understand its effect on the mobility of the radionuclide. The sorption mechanism of 94 Nb on magnetite and the role of Fe(II) site were investigated using classical (solvent extraction), electrochemical (cyclic voltammetry) and the spectroscopic techniques (X-ray photoelectron, X-ray absorption spectroscopy). Insignificant difference in the sorption pattern and percentage sorption was observed under aerobic and anaerobic conditions, suggesting similar sorption mechanism in both the conditions. The oxidation states of Nb and Fe of magnetite remain unchanged after sorption process. In acidic pH condition, the sorption mainly occurs via ion exchange phenomenon whereas in neutral/ basic medium Nb may be coordinated with magnetite via covalent bond formation. The study is important to understand the sorption mechanism of 94 Nb on magnetite, which is essential to predict the migration behaviour of 94 Nb as well as the retarding effect of magnetite in natural aquatic environment.

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Section: Introductionmentioning

confidence: 99%

Sorption of long-lived 94Nb on magnetite: spectroscopic and electrochemical investigation of the associated mechanism

Ghosh

Yadav

Debnath

et al. 2023

J Radioanal Nucl Chem

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“…Generally, model solutions are used in niobium sorption in accordance with many studies (Ghosh et al, 2015). Therefore, most of these studies are of limited use in industry, since the leaching process solutions obtained in industry are complex in composition and consist of several metal ions and other compounds.…”

Section: Introductionmentioning

confidence: 99%

Recovery of niobium pentaoxide and ammonium sulfate from titanium-magnesium production waste

Ultarakova,

Lokhova,

Karshyga

et al. 2023

J. Ecol. Eng.

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This study was aimed to investigate the development of a technology for the extraction of niobium pentaoxide and ammonium sulfate from titanium-magnesium production waste, specifically, the sublimates of dust chamber into concentrate in the form of niobium pentoxide. Optimal conditions for washing the niobium hydroxide precipitate by repulpation with hot (60-70°C) distilled water, drying at 200°C for 6 hours were determined. The influence of temperature and duration of the process was studied. Optimal conditions for the dynamic desorption of niobium from saturated ionite (Purolite A100) was determined. The results further indicated that the optimum quantity of the solution of desorption with sulfuric acid was equal to 5.5% and ammonium oxalate was equal to 4%, while temperature and the flow rate of the desorbing solution was 22-27°C and 6 rpm, respectively. The study of the precipitation of niobium from sulfuric acid desorbates showed that the interaction of niobium ions with ammonia takes place at a low rate. The degree of precipitation of niobium hydroxide equal to 99.6% was achieved in 7 hours of agitation of the suspension at a temperature of 22-25°C.

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Sorption of Protactinium (V) on Silica Colloid and the Effect of Humic Acid

Ghosh

Verma

2019

Thorium—Energy for the Future

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Sorption of niobium on colloidal silica and the effect of humic acid

Cited by 10 publications

References 13 publications

Sorption of long-lived 94Nb on magnetite: spectroscopic and electrochemical investigation of the associated mechanism

Sorption of long-lived 94Nb on magnetite: spectroscopic and electrochemical investigation of the associated mechanism

Recovery of niobium pentaoxide and ammonium sulfate from titanium-magnesium production waste

Sorption of Protactinium (V) on Silica Colloid and the Effect of Humic Acid

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