Biosorption of metals (Cu2+, Zn2+) and anions (F-, H2PO4-) by viable and autoclaved cells of the Gram-negative bacterium Shewanella putrefaciens

Natalia Chubar, Thilo Behrends, Philippe Van Cappellen

    Research output: Contribution to journalArticle

    Abstract

    Microbial biomass represents a potentially cost-effective sorbent for water treatment applications. High sorption capacities for both cations and anions are demonstrated here for viable and autoclaved cell suspensions of the Gram-negative bacterium Shewanella putrefaciens. FTIR absorption spectra and pHdependent zeta-potentials are similar for the viable and killed bacterial cells. Potentiometric titrations, however, reveal a two to three times higher OH- buffering capacity for the living cells. The Cu2+ sorption capacity of the viable cells is also about twice that of the autoclaved cells. Sorption of fluoride and phosphate is not pH-dependent, although an initial addition of acid or base was needed to activate the anion binding sites. Uptake of fluoride is comparable for viable and killed cells.
    Original languageEnglish
    Pages (from-to)126-133
    Number of pages8
    JournalColloids and Surfaces B: Biointerfaces
    Volume65
    Issue number1
    DOIs
    Publication statusPublished - Aug 2008

    Keywords

    • biosorption
    • bio-engineering
    • Shewanella putrefciens
    • bioremediation

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