Biosorption of cadmium by citrobacter sp. JH 11-2 isolated from mining site soil

Jaehong Shim, Jin Won Kim, Patrick J. Shea, Byung Taek Oh

Research output: Contribution to journalArticle

7 Scopus citations

Abstract

The wide use of cadmium (Cd) in batteries and semiconductors poses human and environmental health hazards when these materials are disposed. Citrobacter sp. JH 11-2, isolated from soil at an abandoned mining site, shows potential for use as a biosorbent for Cd removal from aqueous solution. A minimal inhibitory concentration of 300 mg L−1indicated high tolerance of the strain to Cd. The strain effectively removed 47.7% of the Cd from a 100 mg L−1 solution within 160 h. Cell fractioning revealed that most of the Cd (43.5%) was in the membrane fraction, while 38.5% was in the peptidoglycan layer and 18.0% was in the cytoplasmic fraction. Fourier transform infrared spectroscopy (FTIR) confirmed the presence of functional groups on dried Citrobacter sp. JH 11-2 cells that can adsorb or complex Cd ions. A Langmuir model provided a good fit to Cd removal by the cells, which followed pseudo-second-order kinetics. Results support further development of Citrobacter sp. JH 11-2 as a biosorbent for Cd removal.

Original languageEnglish (US)
Pages (from-to)2134-2141
Number of pages8
JournalSeparation Science and Technology (Philadelphia)
Volume50
Issue number14
DOIs
StatePublished - Jan 1 2015

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Keywords

  • Biosorption
  • Cadmium
  • Citrobacter sp
  • Isotherm
  • Kinetics

ASJC Scopus subject areas

  • Chemistry(all)
  • Chemical Engineering(all)
  • Process Chemistry and Technology
  • Filtration and Separation

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