Biosorption of hexavalent chromium using biofilm of E. coli supported on granulated activated carbon

Rabei M. Gabr, Sanaa M.F. Gad-Elrab, Romany N.N. Abskharon, Sedky H.A. Hassan, Ahmed A.M. Shoreit

Research output: Contribution to journalArticlepeer-review

42 Citations (Scopus)

Abstract

The optimization of hexavalent chromium biosorption has been studied by using three different biosorbents; biofilm of E. coli ASU 7 supported on granulated activated carbon (GAC), lyophilized cells of E. coli ASU 7 and granulated activated carbon. Supporting of bacteria on activated carbon decreased both the porosity and surface area of the GAC. Significant decrement of surface area was correlated to the blocking of microspores as a result of the various additional loads. The experimental data of adsorption was fitted towards the models postulated by Langmuir and Freundlich and their corresponding equations. The maximum biosorption capacity for hexavalent chromium using biofilm, GAC and E. coli ASU 7 were 97. 70, 90. 70, 64. 36 mg metal/g at pH 2. 0, respectively. Biosorption mechanism was related mainly to the ionic interaction and complex formation. Based on the experimental conditions, the presence of bacteria could be enhanced the capacity of activated carbon to adsorb hexavalent chromium ions from aqueous solutions.

Original languageEnglish
Pages (from-to)1695-1703
Number of pages9
JournalWorld Journal of Microbiology and Biotechnology
Volume25
Issue number10
DOIs
Publication statusPublished - Aug 2009
Externally publishedYes

Keywords

  • Biofilm
  • Biosorption
  • Chromium
  • E. coli
  • Heavy metals

ASJC Scopus subject areas

  • Biotechnology
  • Physiology
  • Applied Microbiology and Biotechnology

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