Oxidation and Nanoparticle Formation during Ce(III) Sorption onto Minerals

Romanchuk, A.Y.; Plakhova, T.V.; Konyukhova, A.D.; Smirnova, A.; Kozlov, D.A.; Novichkov, D.A.; Trigub, A.L.; Kalmykov, S.N.

Авторы: Romanchuk Anna Yu, Plakhova Tatiana V., Konyukhova Anastasiia D., Smirnova Anastasiia, Kozlov Daniil A., Novichkov Daniil A., Trigub Alexander L., Kalmykov Stepan N.
Журнал: Environmental Science and Technology
Том: 57
Номер: 13
Год издания: 2023
Издательство: American Chemical Society
Местоположение издательства: United States
Первая страница: 5243
Последняя страница: 5251
DOI: 10.1021/acs.est.2c08921
Аннотация: The sorption of Ce(III) on three abundant environmental minerals (goethite, anatase, and birnessite) was investigated. Batch sorption experiments using a radioactive 139Ce tracer were performed to investigate the key features of the sorption process. Differences in sorption kinetics and changes in oxidation states were found in the case of the sorption of Ce(III) on birnessite compared to that on other minerals. Speciation of cerium onto all of the studied minerals was investigated using spectral and microscopic methods: high-resolution transmission electron microscopy (HRTEM), electron energy loss spectroscopy (EELS), and X-ray absorption spectroscopy (XAS) in conjunction with theoretical calculations. It was found that during the sorption process onto birnessite, Ce(III) was oxidized to Ce(IV), while the Ce(III) on goethite and anatase surfaces remained unchanged. Oxidation of Ce(III) by sorption on birnessite was also accompanied by the formation of CeO2 nanoparticles on the mineral surface, which depended on the initial cerium concentration and pH value.
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Oxidation and Nanoparticle Formation during Ce(III) Sorption onto Mineralsстатья

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