Biosorption of silver ions by processed Aspergillus niger biomass |
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Authors: | Md Naseem Akthar K Sivarama Sastry P Maruthi Mohan |
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Institution: | (1) Department of Biochemistry, Osmania University, 500 007 Hyderabad, India |
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Abstract: | 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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