Interaction of niobium with iron-oxide colloids and the role of humic acid

Ghosh, Madhusudan; Swain, K. K.; Verma, Rakesh Kumar

doi:10.1016/j.jenvrad.2017.08.003

Cited by 13 publications

(3 citation statements)

References 28 publications

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“…The similarity of Nb-substituted goethite reference XANES spectrum with that of the Pitinga goethite also excludes the possibility of Nb adsorption onto Fe oxides. Such chemisorption process occurring onto hematite and goethite is nonetheless possible in near-neutral pH with 80−90 % of Nb being adsorbed (Ghosh et al, 2017) but only at extremely low Nb concentrations (ca 2.10 -9 mol.L -1 ).…”

Section: Atomic-scale Processes Controlling Niobium Mobility During S...mentioning

confidence: 99%

Multiscale processes controlling niobium mobility during supergene weathering

Bollaert,

Chassé,

Allard

et al. 2023

Geochimica et Cosmochimica Acta

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Section: Atomic-scale Processes Controlling Niobium Mobility During S...mentioning

confidence: 99%

Multiscale processes controlling niobium mobility during supergene weathering

Bollaert,

Chassé,

Allard

et al. 2023

Geochimica et Cosmochimica Acta

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“…(3) Hydrophobic interaction is caused by some non-polar components in OM, which exhibit hydrophobicity, leading to their alienation from water molecules and their adsorption on the surface of goethite (Chen et al, 2019). ( 4) Entropy effect means that the complexation or adsorption between OM and goethite is driven by physical adsorption, which is conducive to entropy change (Ghosh et al, 2017). ( 5) The van der Waals force's contribution to the adsorption is generally not strong, but only shows a relatively important role in a strong ionic strength system.…”

Section: Potential Mechanismsmentioning

confidence: 99%

Influencing factors and environmental effects of interactions between goethite and organic matter: A critical review

Chen

et al. 2022

Front. Environ. Sci.

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This paper reviews progresses in the interactions between goethite and organic matter (OM) and their environmental effects in recent decades. The interactions mainly include the effect of organic matter on the surface properties and the crystallization of goethite, molecular changes of OM caused by goethite, and their interaction mechanisms, which can be depicted by the commonly used Langmuir model, the charge distribution multi-site complexation model (CD-MUSIC model), ligand charge distribution model (LCD model), and natural organic matter charge distribution model (NOM-CD model). The influencing factors of the interactions are summarized with emphasis on the external, including pH, ionic strength, carbon dioxide (CO2), and the internal, including the structure of OM and iron species. The goethite—OM complexes caused by the interactions will affect migration and transformation of conventional heavy metals and emerging antibiotics. The complexes, as the carrier of carbon and iron, are also the critical parts of the carbon and iron cycles, which are associated with climate change. This review provides a basis for future mechanism studies of formation, transformation, and effects of goethite—OM complexes (particulate OM or carbon-contained minerals) in different environmental systems at a molecular level.

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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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Interaction of niobium with iron-oxide colloids and the role of humic acid

Cited by 13 publications

References 28 publications

Multiscale processes controlling niobium mobility during supergene weathering

Multiscale processes controlling niobium mobility during supergene weathering

Influencing factors and environmental effects of interactions between goethite and organic matter: A critical review

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

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