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

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• 作者：Wei Zhou (1)
  Maohua Yang (1)
  Ziyu Song (1)
  Jianmin Xing (1) (2)
  
  1. National Key Laboratory of Biochemical Engineering ; Institute of Process Engineering ; Chinese Academy of Sciences ; Beijing ; 100-190 ; China
  2. National Key Laboratory of Biochemical Engineering ; Institute of Process Engineering ; Beijing ; 100-190 ; China
  
• 关键词：anaerobic processes ; biodesulfurization ; cell immobilization ; Citrobacter sp. HCSR ; magnetic particles (MNPs) ; waste ; water treatment
• 刊名：Biotechnology and Bioprocess Engineering
• 出版年：2015
• 出版时间：February 2015
• 年：2015
• 卷：20
• 期：1
• 页码：117-123
• 全文大小：517 KB
• 参考文献：1. Muyzer, G., Stams, A. M. (2008) The ecology and biotechnology of sulphate-reducing bacteria. Nat. Rev. Microbiol. 6: pp. 441-454
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  4. Hubert, C., Voordouw, G. (2007) Oil field souring control by nitrate-reducing Sulphurospirillum spp. That out compete sulfate-reducing bacteria for organic electron donors. Appl. Environ. Microbiol. 73: pp. 2644-2652 CrossRef
  5. Wilms, R., Sass, H., Kopke, B., Cypionka, H., Engelen, B. (2007) Methane and sulphate profiles within the subsurface of a tidal flat are reflected by the distribution of sulphate-reducing bacteria and methanogenic archaea. FEMS. Microbiol. Ecol. 59: pp. 611-621 CrossRef
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  7. Luo, Y. D., Dai, C. A., Chiu, W. Y. (2008) Polystyrene/Fe3O4 composite latex via miniemulsion polymerization-nucleation mechanism and morphology. Polym. Chem. 46: pp. 1014-1024 CrossRef
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  9. Lellouche, J. P., Senthil, G., Joseph, A. (2005) Magnetically responsive carboxylated magnetite polydipyrrole/ polydicarbazole nanocomposites of core-shell morphology. Preparation, characterization, and use in DNA hybridization. J. Am. Chem. Soc. 127: pp. 11998-12006 CrossRef
  10. Ashtari, P., He, X. X., Wang, K., Gong, P. (2005) An efficient method for recovery of target ssDNA based on amino-modified silica-coated magnetic nanoparticles. Talanta. 67: pp. 548-554 CrossRef
  11. Rao, A. G., Ravichandra, P., Joseph, J., Jetty, A., Sarma, P. N. (2007) Microbial conversion of sulphur dioxide in flue gas to sulphide using bulk drug industry wastewater as an organic source by mixed cultures of sulphate reducing bacteria. J. Hazard. Mater. 147: pp. 718-725 CrossRef
  12. Qiu, R. L., Zhao, B. L., Liu, J. L., Huang, X. F. (2009) Sulfate reduction and copper precipitation by a Citrobacter sp. isolated from a mining area. J. Hazard. Mater. 164: pp. 1310-1315 CrossRef
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  14. Mogensen, G. L., Kjeldsen, K. U., Ingvorsen, K. (2005) Desulfovibrio aerotolerans sp. nov., an oxygen tolerant sulphate reducing bacterium isolated fromactivated sludge. Anaerobe. 11: pp. 339-349 CrossRef
  15. Rees, G. N., Patel, B. K. (2001) Desulforegula conservatrix gen. nov., sp. nov., a long-chain fatty acid-oxidizing, sulfate-reducing bacterium isolated from sediments of a freshwater lake. Int. J. Syst. Bacteriol. 51: pp. 1911-1916 CrossRef
  
• 刊物类别：Chemistry and Materials Science
• 刊物主题：Chemistry
  Biotechnology
  
• 出版者：The Korean Society for Biotechnology and Bioengineering
• ISSN：1976-3816

文摘

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.