期刊
ENVIRONMENTAL POLLUTION
卷 237, 期 -, 页码 228-236出版社
ELSEVIER SCI LTD
DOI: 10.1016/j.envpol.2018.02.060
关键词
Reduction; Trogerite; Antioxidase; Thiol compounds; Organic acid
资金
- National Natural Science Foundation of China [21607156, 21577093, 91326202]
- China Postdoctoral Science Foundation [2015M581047]
- Fundamental Research Funds for the Central Universities [JB2015001]
- Priority Academic Program Development of Jiangsu Higher Education Institutions
- Collaborative Innovation Center of Radiation Medicine of Jiangsu Higher Education Institutions
The combined pollution of radionuclides and heavy metals has been given rise to widespread concern during uranium mining. The influence of As(V) on U(VI) immobilization by Mucor circinelloides (M. circinelloides) was investigated using batch experiments. The activity of antioxidative enzymes and concentrations of thiol compounds and organic acid in M. circinelloides increased to respond to different U(VI) and As(V) stress. The morphological structure of M. circinelloides changed obviously under U(VI) and As(V) stress by SEM and TEM analysis. The results of XANES and EXAFS analysis showed that U(VI) was mainly reduced to nano-uraninite (nano-UO2, 30.1%) in U-400, while only 9.7% of nano-UO2 was observed in the presence of As(V) in U-400-As-400 due to the formation of uranyl arsenate precipitate (Trogerite, 48.6%). These observations will provide the fundamental data for fungal remediation of uranium and heavy metals in uranium-contaminated soils. (C) 2018 Elsevier Ltd. All rights reserved.
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