Enhanced immobilization of U(VI) on Mucor circinelloides in presence of As(V): Batch and XAFS investigation

Wencheng Song; Xiangxue Wang; Zhongshan Chen; Guodong Sheng; Tasawar Hayat; Xiangke Wang; Yubing Sun

doi:10.1016/j.envpol.2018.02.060

Enhanced immobilization of U(VI) on Mucor circinelloides in presence of As(V): Batch and XAFS investigation

Environ Pollut. 2018 Jun:237:228-236. doi: 10.1016/j.envpol.2018.02.060. Epub 2018 Feb 24.

Authors

Wencheng Song¹, Xiangxue Wang², Zhongshan Chen², Guodong Sheng³, Tasawar Hayat⁴, Xiangke Wang⁵, Yubing Sun⁶

Affiliations

¹ Anhui Province Key Laboratory of Medical Physics Technology and Center of Medical Physics and Technology, Hefei Institutes of Physical Sciences and Hefei Cancer Hospital, Chinese Academy of Sciences, Hefei 230031, PR China; College of Environmental Science and Engineering, North China Electric Power University, Beijing 102206, PR China.
² College of Environmental Science and Engineering, North China Electric Power University, Beijing 102206, PR China.
³ College of Environmental Science and Engineering, North China Electric Power University, Beijing 102206, PR China; College of Chemistry and Chemical Engineering, Shaoxing University, Zhejiang 312000, PR China.
⁴ Collaborative Innovation Center of Radiation Medicine of Jiangsu Higher Education Institutions and School for Radiological and Interdisciplinary Sciences, Soochow University, 215123, Suzhou, PR China.
⁵ College of Environmental Science and Engineering, North China Electric Power University, Beijing 102206, PR China; Collaborative Innovation Center of Radiation Medicine of Jiangsu Higher Education Institutions and School for Radiological and Interdisciplinary Sciences, Soochow University, 215123, Suzhou, PR China; NAAM Research Group, Faculty of Science, King Abdulaziz University, Jeddah 21589, Saudi Arabia.
⁶ College of Environmental Science and Engineering, North China Electric Power University, Beijing 102206, PR China. Electronic address: sunyb@ipp.ac.cn.

PMID: 29486456
DOI: 10.1016/j.envpol.2018.02.060

Abstract

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 U₄₀₀, while only 9.7% of nano-UO₂ was observed in the presence of As(V) in U₄₀₀-As₄₀₀ due to the formation of uranyl arsenate precipitate (Trögerite, 48.6%). These observations will provide the fundamental data for fungal remediation of uranium and heavy metals in uranium-contaminated soils.

Keywords: Antioxidase; Organic acid; Reduction; Thiol compounds; Trögerite.

MeSH terms

Arsenates
Arsenic / metabolism*
Biodegradation, Environmental
Environmental Pollution
Mucor / metabolism*
Oxidation-Reduction
Uranium / chemistry
Uranium / metabolism*

Substances

Arsenates
Uranium
Arsenic
arsenic acid