U(VI) removal kinetics in presence of synthetic magnetite nanoparticles

Huber, Florian; Schild, Dieter; Vitova, T.; Rothe, Jörg; Kirsch, Regina; Schäfer, Thorsten

doi:10.1016/j.gca.2012.07.019

Cited by 63 publications

(74 citation statements)

References 58 publications

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“…Numbers in parentheses are one standard deviation on the last decimal place. 2014), but was in excess of that observed experimentally elsewhere (Huber et al, 2012). However, in contrast to the study of Huber et al (2012), here U was present during magnetite formation, indicating that U incorporation occurs mainly in the rapid crystallization phase, but continues during ageing.…”

Section: X-ray Absorption Spectroscopycontrasting

confidence: 78%

“…Indeed, with time, it appears that adsorbed uranium may become incorporated into the magnetite structure with XPS suggesting U(VI) and U(V), and XANES suggesting U(IV) and U(V)/U(VI). EXAFS modelling was more challenging but the authors suggested that U was incorporated into the magnetite octahedral site (Huber et al, 2012). U(IV) associated with iron oxide minerals as UO 2 is easily remobilized to solution under oxidizing, and potentially even mildly reducing conditions (Senko et al, 2002(Senko et al, , 2007Campbell et al, 2011).…”

Section: Introductionmentioning

confidence: 99%

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Uranium fate during crystallization of magnetite from ferrihydrite in conditions relevant to the disposal of radioactive waste

et al. 2015

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Uranium incorporation into magnetite and its behaviour during subsequent oxidation has been investigated at high pH to determine the uranium retention mechanism(s) on formation and oxidative perturbation of magnetite in systems relevant to radioactive waste disposal. Ferrihydrite was exposed to U(VI) aq containing cement leachates ( pH 10.5-13.1) and crystallization of magnetite was induced via addition of Fe(II) aq . A combination of XRD, chemical extraction and XAS techniques provided direct evidence that U(VI) was reduced and incorporated into the magnetite structure, possibly as U(V), with a significant fraction recalcitrant to oxidative remobilization. Immobilization of U(VI) by reduction and incorporation into magnetite at high pH, and with significant stability upon reoxidation, has clear and important implications for limiting uranium migration in geological disposal of radioactive wastes.

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Section: X-ray Absorption Spectroscopycontrasting

confidence: 78%

Section: Introductionmentioning

confidence: 99%

Uranium fate during crystallization of magnetite from ferrihydrite in conditions relevant to the disposal of radioactive waste

et al. 2015

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“…1 Uranium (U(VI)) and its compounds are highly toxic and can cause progressive or irreversible renal injury. 4,5 More importantly, as the naturally occurring minerals composed of Fe(II) and Fe(III), magnetite was evidenced to reduce U(VI) to U(IV) by the oxidation of Fe(II). 3 Magnetite nanoparticles have been widely used for U(VI) removal with the advantage of high surface area, inexpensive cost and strong magnetic responsivity.…”

Section: Introductionmentioning

confidence: 99%

Retracted Article: Simultaneous sorption and reduction of U(vi) on magnetite–reduced graphene oxide composites investigated by macroscopic, spectroscopic and modeling techniques

et al. 2015

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Magnetite-reduced graphene oxide (M-rGO) composites with different mass% (from 33% to 93%) magnetite contents were successfully synthesized via an in situ chemical precipitation method. The composites of M-rGO were characterized by SEM, XRD, FTIR, and XPS techniques. Macroscopic, spectroscopic and modeling techniques were used to study the mechanism for U(VI) removal by M-rGO. The results revealed that the high performance of M-rGO toward U(VI) removal resulted from the contribution of both sorption and reduction mechanisms. The reduction of U(VI) to U(IV) by M-rGO increased with increasing content of magnetite (Fe 3 O 4 ), as evidenced by the XPS analysis. The kinetics model further suggested that the reduction reaction happened after the sorption of U(VI) on M-rGO. U(VI) was adsorbed on M-rGO via outer-sphere and inner-sphere surface complexation with oxygencontaining groups, whereas the inner-sphere surface complexation dominated with the increasing content of Fe 3 O 4 on M-rGO due to the increased sorption sites (i.e.,^FeOH). The findings herein highlight the elucidation of the interaction mechanisms between M-rGO and U(VI), which is of significance in predicting the U(VI) removal properties of M-rGO and designing versatile adsorbents in environmental cleanup.

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“…It was suggested that the reduction of uranium with the iron sulfide mineral under low temperature conditions was an important process in the transport of U in the subsurface environments at U contaminated sites. Likewise, Huber et al reported that >90% U was removed from aqueous solution by a synthetic magnetite(Fe II ,Fe III 2 O 4 ) nanoparticles after 24 h within the pH range of 5–11. Up to 80% U(VI) was reduced to U(IV) and bound onto the surface of magnetites.…”

Section: Applications Of Xanes In Actinide Characterizationmentioning

confidence: 97%

Exploring Actinide Materials Through Synchrotron Radiation Techniques

et al. 2014

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Synchrotron radiation (SR) based techniques have been utilized with increasing frequency in the past decade to explore the brilliant and challenging sciences of actinide‐based materials. This trend is partially driven by the basic needs for multi‐scale actinide speciation and bonding information and also the realistic needs for nuclear energy research. In this review, recent research progresses on actinide related materials by means of various SR techniques were selectively highlighted and summarized, with the emphasis on X‐ray absorption spectroscopy, X‐ray diffraction and scattering spectroscopy, which are powerful tools to characterize actinide materials. In addition, advanced SR techniques for exploring future advanced nuclear fuel cycles dealing with actinides are illustrated as well.

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U(VI) removal kinetics in presence of synthetic magnetite nanoparticles

Cited by 63 publications

References 58 publications

Uranium fate during crystallization of magnetite from ferrihydrite in conditions relevant to the disposal of radioactive waste

Uranium fate during crystallization of magnetite from ferrihydrite in conditions relevant to the disposal of radioactive waste

Retracted Article: Simultaneous sorption and reduction of U(vi) on magnetite–reduced graphene oxide composites investigated by macroscopic, spectroscopic and modeling techniques

Exploring Actinide Materials Through Synchrotron Radiation Techniques

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