Kinetics and mechanism of rhenium-ethylenediaminetetraacetic acid (Re(IV)-EDTA) complex degradation; For 99Tc-EDTA degradation in the natural environment
SCIE
SCOPUS
- Title
- Kinetics and mechanism of rhenium-ethylenediaminetetraacetic acid (Re(IV)-EDTA) complex degradation; For 99Tc-EDTA degradation in the natural environment
- Authors
- Khan, Mumtaz; Um, Wooyong; Han, Sangsoo; Kang, Jaehyuk; Jabbar, Abdul; Iqbal, Muhammad Adnan
- Date Issued
- 2022-08
- Publisher
- Elsevier B.V.
- Abstract
- © 2022 The Author(s)Mechanism and kinetics of Rhenium complexes as a surrogate of Technetium-99 (99Tc) is worthy of study from radioactive waste safe disposal perspective. Re(IV)-EDTA was synthesized via the reduction of Re(VII) with Sn(II) in the presence of Ethylenediaminetetraacetic acid (EDTA). The Re(IV)-EDTA was then degraded by H2O2 (7%–30%) at pH of 3–11 in ionic strength I = 0–2 M solution. The Re-EDTA was observed to degrade more rapidly at pH of ≤ 3–4 than one of ≥ 10–11 and remained stable at pH = 7–9. The Re-EDTA was degraded in accordance with the H+ addition mechanism in the acidic range and ligand charge transfer in the alkaline region. Complex degradation followed the zero-order rate kinetics for the H+ and Re-EDTA parameters, apart from a pH of 3, for which degradation was a better fit to first order kinetics. A higher Re(IV)-EDTA stability at a pH of 7–9 demonstrated that Re(IV)-EDTA (or 99Tc(IV)-EDTA) tends to be more persistent in natural environments similar to the pH range of 7–9.
- URI
- https://oasis.postech.ac.kr/handle/2014.oak/113051
- DOI
- 10.1016/j.eti.2022.102492
- ISSN
- 2352-1864
- Article Type
- Article
- Citation
- Environmental Technology and Innovation, vol. 27, 2022-08
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- There are no files associated with this item.
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