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Technetium retention by green rust chloride

Mayordomo, Natalia; Rodríguez, Diana M.; Schild, Dieter ORCID iD icon; Rossberg, André; Scheinost, Andreas C.; Brendler, Vinzenz; Müller, Katharina


Technetium-99 ($^{99}$Tc) is one of the most concerning fission products due to its long half-life (2.14∙10$^{5}$ years) and the mobility of the anion pertechnetate (TcO$_{4-}$). [1] However, Tc migration decreases when Tc(VII) is reduced to Tc(IV). This scavenging step is favored by reductive material, among which Fe(II) minerals have been widely studied due to their versatility, low cost and ubiquity. [2]

Green rust is a Fe(II)-Fe(III) mixed hydroxide that possesses adsorption, anion exchange and reduction capabilities. Its presence is expected in the near- and far-field of a nuclear waste repository because it is an iron corrosion product, and it is also formed in the environment when Fe$^{2+}$ interacts with Fe(III) minerals. [3]

Batch contact studies have been performed under a wide range of conditions, i.e. pH (3-11), Tc concentration (nM-mM), and ionic strength (0-0.1 M). X-ray diffraction, Raman microscopy, X-ray photoelectron spectroscopy (XPS), and X-ray absorption spectroscopy (XAS) provided information on Tc oxidation state and speciation as well as on secondary redox products related to the Tc interaction with green rust. ... mehr

Zugehörige Institution(en) am KIT Institut für Nukleare Entsorgung (INE)
Publikationstyp Vortrag
Publikationsjahr 2021
Sprache Englisch
Identifikator KITopen-ID: 1000136057
HGF-Programm 32.11.03 (POF IV, LK 01) Fundamental Scientific Aspects
Veranstaltung Goldschmidt (2021), Online, 04.07.2021 – 09.07.2021
Externe Relationen Abstract/Volltext
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