Abiotic reduction of uranium by mackinawite (FeS) biogenerated under sulfate-reducing condition

Seung Yeop Lee, Min Hoon Baik, Hye Ryun Cho, Euo Chang Jung, Jong Tae Jeong, Jong Won Choi, Young Boo Lee, Yong Jae Lee

Research output: Contribution to journalArticlepeer-review

21 Citations (Scopus)

Abstract

Sulfate-reducing bacteria and their by-products, such as iron sulfides, are widely distributed in groundwater and sediments, and can affect subsurface aqueous chemistry. Here we show the catalytic reduction of hexavalent uranium by FeS particles, which were largely generated by the activities of Desulfovibrio desulfuricans and D. vulgaris in anaerobic condition. Characterization of FeS particles by X-ray diffraction and high-resolution transmission electron microscopy revealed the presence of mackinawite having thin and flexible platy sheets with 0.5-nm lamellar spacing. This biogenic phase mediated abiotic reduction of U(VI) to U(IV) which was confirmed by UV-Vis absorption spectroscopy. The U conversion occurred through surface catalysis that involved adsorption of aqueous U(VI)-carbonate complexes (predominantly UO 2(CO3) 3 4-) onto the mackinawite, but the transformed uranium was then released and remained in suspended form in the solution phase. This surface catalysis and subsequent U(IV) remobilization has not been reported as a pathway to occur under sulfate-reducing conditions. Our results suggest that the iron sulfide solid, which is characteristic of conductive property, is very sensitive and variable depending on the electron supplying and transferring environment, negatively affecting the surface uranium to be strongly stabilized and fixed on the FeS surface.

Original languageEnglish
Pages (from-to)1311-1319
Number of pages9
JournalJournal of Radioanalytical and Nuclear Chemistry
Volume296
Issue number3
DOIs
Publication statusPublished - 2013 Jun

Bibliographical note

Funding Information:
Acknowledgments We thank Dr. Arokiasamy J. Francis and Dr. Wooyong Um for his helpful discussions and reviews on this manuscript. This work was supported by the Nuclear Research and Development Program of National Research Foundation of Korea (NRF) funded by the Ministry of Education, Science and Technology (MEST).

All Science Journal Classification (ASJC) codes

  • Analytical Chemistry
  • Nuclear Energy and Engineering
  • Radiology Nuclear Medicine and imaging
  • Pollution
  • Spectroscopy
  • Public Health, Environmental and Occupational Health
  • Health, Toxicology and Mutagenesis

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