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Biosorption of silver ions by processed Aspergillus niger biomass

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Summary

An alkali treated A. niger biomass was found to efficiently sequester silver ions from dilute as well as concentrated solutions (2.5–1000 ppm Ag+), with an ability to bind it to a level of upto 10% of dry weight. Biosorption of silver ions was not influenced by pH between 5–7. The bound Ag+ could be fully desorbed by dilute HNO3 and the biosorbent regenerated by washing with Ca2+/Mg2+ solution. This biosorbent is unique in that the mechanism of metal ion sorption has been found to be exclusively by stoichiometric exchange with Ca2+ and Mg2+ of the biosorbent.

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Authors and Affiliations

  1. Department of Biochemistry, Osmania University, 500 007, Hyderabad, India

    Naseem Akthar Md., Sivarama Sastry K. & Maruthi Mohan P.

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  1. Naseem Akthar Md.
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  2. Sivarama Sastry K.
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  3. Maruthi Mohan P.
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Naseem Akthar, M., Sivarama Sastry, K. & Maruthi Mohan, P. Biosorption of silver ions by processed Aspergillus niger biomass. Biotechnol Lett 17, 551–556 (1995). https://doi.org/10.1007/BF00132027

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