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Enhanced sulfate reduction by Citrobacter sp. coated with Fe3O4/SiO2 magnetic nanoparticles

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Abstract

A sulfate-reducing Citrobacter strain was isolated and coated with Fe3O4/SiO2 magnetic nanoparticles (MNPs) to enhance sulfate reduction. Biolog analysis showed that it utilizes a broad range of electron donors. The findings also showed that this bacteria strain is a facultative anaerobe and can completely reduce 12 mM of sulfate to sulfide in 7 days under anaerobic conditions. Moreover, sulfate reduction was enhanced by 79% under optimized conditions. Different SiO2 wrap-ratios of the MNPs attached to the cell surface were studied to optimize the sulfate reduction: the surface of cells coated with 300% silica wrap-ratio MNPs showed the highest stability and increased desulfurization batch time, with a 450% increase in sulfate reduction in comparison with uncoated cells cultivated in anaerobic conditions.

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Authors and Affiliations

  1. National Key Laboratory of Biochemical Engineering, Institute of Process Engineering, Chinese Academy of Sciences, Beijing, 100-190, China

    Wei Zhou, Maohua Yang, Ziyu Song & Jianmin Xing

  2. National Key Laboratory of Biochemical Engineering, Institute of Process Engineering, Beijing, 100-190, China

    Jianmin Xing

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  1. Wei Zhou
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  2. Maohua Yang
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  3. Ziyu Song
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  4. Jianmin Xing
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Correspondence to Jianmin Xing.

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Zhou, W., Yang, M., Song, Z. et al. Enhanced sulfate reduction by Citrobacter sp. coated with Fe3O4/SiO2 magnetic nanoparticles. Biotechnol Bioproc E 20, 117–123 (2015). https://doi.org/10.1007/s12257-014-0504-8

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  • DOI: https://doi.org/10.1007/s12257-014-0504-8

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