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Porträt Dr. Müller, Katharina; FWOG

Dr. Katharina Müller

Leiterin Grenzflächenprozesse
k.muellerAthzdr.de
Tel.: +49 351 260 2439

Abteilung Grenzflächenprozesse


Sorption

Arbeitsgebiete


Exploring the Reduction Mechanism of ⁹⁹Tc(VII) in NaClO₄: A Spectro-Electrochimical Approach

Rodriguez Hernandez, D. M.; Mayordomo, N.; Parra-Puerto, A.; Schild, D.; Brendler, V.; Stumpf, T.; Müller, K.

Technetium (Tc) is an environmentally relevant radioactive contaminant whose migration is limited when Tc(VII) is reduced to Tc(IV). However, its reaction mechanisms are not well understood yet. We have combined electrochemistry, spectroscopy, and microscopy (cyclic voltammetry, rotating disk electrode, X-ray photoelectron spectroscopy, and Raman and scanning electron microscopy) to study Tc(VII) reduction in non-complexing media: 0.5 mM KTcO₄ in 2 M NaClO₄ in the pH from 2.0 to 10.0. At pH 2.0, Tc(VII) first gains 2.3 ± 0.3 electrons, following Tc(V) rapidly receives 1.3 ± 0.3 electrons yielding Tc(IV). At pH 4.0−10.0, Tc(IV) is directly obtained by transfer of 3.2 ± 0.3 electrons. The reduction of Tc(VII) produced always a black solid identified as Tc(IV) by Raman and XPS. Our results
narrow a significant gap in the fundamental knowledge of Tc aqueous chemistry and are important to understand Tc speciation.
They provide basic steps on the way from non-complexing to complex media.

Keywords: Technetium; Raman spectroscopy; X-ray photoelectron spectroscopy; Non-complexing media

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Mitarbeiter

FWOG

Leitung

NameGeb./Raum+49 351 260Email
Dr. Katharina Müller801/P2482439
k.muellerAthzdr.de

Mitarbeiter

NameGeb./Raum+49 351 260Email
Daniel Butscher801/P3523154
d.butscherAthzdr.de
Aline Chlupka801/P2032429
2528
a.chlupkaAthzdr.de
Sebastian Friedrich801/P3523154
s.friedrichAthzdr.de
Isabelle Jessat801/P3523328
i.jessatAthzdr.de
Dr. Norbert Jordan801/P2182148
n.jordanAthzdr.de
Dr. Natalia Mayordomo Herranz801/P2522076
n.mayordomo-herranzAthzdr.de
Christa Müller3198
2538
c.muellerAthzdr.de
Stephan Weiß801/P3162758
2523
s.weissAthzdr.de

Einbau in Festphasen

NameGeb./Raum+49 351 260Email
Dr. Nina Maria Huittinen801/P2182148
n.huittinenAthzdr.de
Dr. Astrid Barkleit801/P2073136
2512
2518
a.barkleitAthzdr.de
Dr. Sara Gilson801/P3523154
s.gilsonAthzdr.de


Kontakt

Dr. Katharina Müller

Leiterin Grenzflächenprozesse
k.muellerAthzdr.de
Tel.: +49 351 260 2439