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  • 1
    Electronic Resource
    Electronic Resource
    The Application of a Sol-Gel Technique to Preparation of a Heavy Metal Biosorbent from Yeast Cells (1998)
    Springer
    Journal of sol gel science and technology 13 (1998), S. 289-294 
    Details
    ISSN: 1573-4846
    Keywords: sol-gel ; metal biosorption ; polysaccharide encapsulation ; column sorption
    Source: Springer Online Journal Archives 1860-2000
    Topics: Chemistry and Pharmacology
    Notes: Abstract In this work we compared biosorbents obtained by encapsulation of polysaccharides, isolated from waste brewing biomass, in sol-gel derived silicates and an organic polymer. Biosorbents were prepared by mixing cross-linking-agents—organic or siliceous—with dried cells envelopes. Siliceous prepolymers were synthezised via transesterification and hydrolysis from tetraethoxysilane (TEOS) and methanol. Sorption of Cd2+, Cu2+ and Ag+ by biosorbent granules (0.25–0.6 mm) was examined in batch and in a packed column. The biosorbent prepared by interesterification of TEOS showed a 2–3 times higher intensity of sorption than the biosorbent cross-linked with epichlorohydrin (the most effective cross-linking organic agent) while the sorption capacity of both biosorbents was equal. The specific surface area of the silica matrix was 597 m2/g but only traces of metals were sequestered from solution with a concentration of Cd2+ of 50 mg/l. The biosorbent with a silica matrix is a heterogeneous material containing microporous matrix inclusions of thin cell walls. Its high sorption intensity and good mechanical strength will be useful in continuous metal uptake of low concentrations of metals.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1023/A:1008659807522
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    Paper (German National Licenses)
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  • 2
    Electronic Resource
    Electronic Resource
    Development of magnetic biosorbents for metal uptake (1997)
    Springer
    Biotechnology techniques 11 (1997), S. 483-487 
    Details
    ISSN: 1573-6784
    Source: Springer Online Journal Archives 1860-2000
    Topics: Process Engineering, Biotechnology, Nutrition Technology
    Notes: Abstract Two types of magnetic biosorbent were prepared by novel protocols from epichlorhydrin-cross-linked Saccharomyces cerevisiae cell walls and their biosorption characteristics were compared to those of non-magnetic cell walls. The magnetic biosorbents I and II were capable of binding Cu maximally to 225 and 50 mmol/g, Cd to 90 and 25 mmol/g and Ag + to 80 and 45 mmol/g respectively. These values compare with 400, 125 and 75 mmol/g, respec-tively, for non-magnetic cell walls.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1023/A:1018453814472
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    Paper (German National Licenses)
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