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Environ Sci Pollut Res Int. 2018 Aug;25(23):22368-22377. doi: 10.1007/s11356-017-9891-7. Epub 2017 Aug 10.

Synergistic interface behavior of strontium adsorption using mixed microorganisms.

Author information

1
School of Materials Science and Engineering, Southwest University of Science and Technology, Mianyang, 621010, China.
2
School of Environment and Resource, Southwest University of Science and Technology, Mianyang, 621010, China.
3
School of Environment and Resource, Southwest University of Science and Technology, Mianyang, 621010, China. fqdong2004@163.com.
4
Key Laboratory of Solid Waste Treatment and Resource Recycle, Ministry of Education of China, Mianyang, 621010, China. fqdong2004@163.com.
5
China National Quality Supervision and Inspection Centre for Alcoholic Beverage Products and Processed Food, Luzhou, 646000, China.
6
Key Laboratory of Solid Waste Treatment and Resource Recycle, Ministry of Education of China, Mianyang, 621010, China.

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; Interface behavior; Mixed microorganisms; Strontium ions

PMID:
28799041
DOI:
10.1007/s11356-017-9891-7
[Indexed for MEDLINE]

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