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Impact of Cr and Co on Tc-99 retention in magnetite: A combined study of ab initio molecular dynamics and experiments

Title
Impact of Cr and Co on Tc-99 retention in magnetite: A combined study of ab initio molecular dynamics and experiments
Authors
Lee M.-S.Saslow S.A.Um W.Kim D.-S.Kruger A.A.Rousseau R.Glezakou V.-A.
Date Issued
5-Apr-2020
Publisher
ELSEVIER
Abstract
The effect of co-mingled dopants, Co(II) and Cr(III), on Tc(IV) incorporation and retention in magnetite under varying temperatures (75-700 degrees C) was explored using ab initio molecular dynamics simulations, batch experiments, and solid phase characterization. Tc(IV) stabilization was achieved with a magnetite surface over-saturated with or containing an equal number of Tc and Cr. Under oversaturation conditions, the forced formation of a Cr2O3 phase on the magnetite surface may help prevent Tc release. Upon Co addition, and depending on the relative concentration of Tc, Cr, and Co at the magnetite surface, Co was found to preferentially stabilize Cr rather than Tc and suppress the formation of the protective Cr2O3 surface phase. Only systems with similar Cr/Co concentrations or relatively high Cr concentrations stabilized Tc within magnetite. As such, the relative concentration of Tc, Cr, and Co was identified as a critical parameter for maximizing dopant efficacy towards Tc stabilization in magnetite.
Keywords
RAY-ABSORPTION SPECTROSCOPY; TECHNETIUM INCORPORATION; WASTE FORM; REDUCTION; RHENIUM; IMMOBILIZATION; TC(VII)
URI
http://oasis.postech.ac.kr/handle/2014.oak/101203
ISSN
0304-3894
Article Type
Article
Citation
JOURNAL OF HAZARDOUS MATERIALS, vol. 387, 2020-04-05
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