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Environmental Science and Pollution Research

, Volume 25, Issue 23, pp 22368–22377 | Cite as

Synergistic interface behavior of strontium adsorption using mixed microorganisms

  • Wenyuan Hu
  • Faqin Dong
  • Guangmin Yang
  • Xin Peng
  • Xiaojun Huang
  • Mingxue Liu
  • Jing Zhang
Interface Effect of Ultrafine Mineral Particles and Microorganisms

Abstract

The proper handling of low-level radioactive waste is crucial to promote the sustainable development of nuclear power. Research into the mechanism for interactions between bacterium and radionuclides is the starting point for achieving successful remediation of radionuclides with microorganisms. Using Sr(II) as a simulation radionuclide and the mixed microorganisms of Saccharomyces cerevisiae and Bacillus subtilis as the biological adsorbent, this study investigates behavior at the interface between Sr(II) and the microorganisms as well as the mechanisms governing that behavior. The results show that the optimal ratio of mixed microorganisms is S. cerevisiae 2.0 g L−1 to B. subtilis 0.05 g L−1, and the optimal pH is about 6.3. Sr(II) biosorption onto the mixed microorganisms is spontaneous and endothermic in nature. The kinetics and the equilibrium isotherm data of the biosorption process can be described with pseudo-second-order equation and the Langmuir isotherm equation, respectively. The key interaction between the biological adsorbent and Sr(II) involves shared electronic pairs arising from chemical reactions via bond complexation or electronic exchange, and spectral and energy spectrum analysis show that functional groups (e.g., hydroxyl, carboxyl, amino, amide) at the interface between the radionuclide and the mixed microorganisms are the main active sites of the interface reactions.

Keywords

Biosorption Mixed microorganisms Strontium ions Interface behavior 

Notes

Acknowledgements

This study was sponsored by the National Basic Research Program of China (973 Program: 2014CB846003). The author would also like to thank Dr. Patrick Diehl for his help in revising and polishing this paper.

Supplementary material

11356_2017_9891_MOESM1_ESM.docx (113 kb)
ESM 1 (DOCX 113 kb)

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Copyright information

© Springer-Verlag GmbH Germany 2017

Authors and Affiliations

  • Wenyuan Hu
    • 1
    • 2
  • Faqin Dong
    • 2
    • 3
  • Guangmin Yang
    • 1
  • Xin Peng
    • 1
  • Xiaojun Huang
    • 4
  • Mingxue Liu
    • 3
  • Jing Zhang
    • 1
  1. 1.School of Materials Science and EngineeringSouthwest University of Science and TechnologyMianyangChina
  2. 2.School of Environment and ResourceSouthwest University of Science and TechnologyMianyangChina
  3. 3.Key Laboratory of Solid Waste Treatment and Resource Recycle, Ministry of Education of ChinaMianyangChina
  4. 4.China National Quality Supervision and Inspection Centre for Alcoholic Beverage Products and Processed FoodLuzhouChina

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