Biosorption of precious metals

Biosorption has emerged as a low-cost and often low-tech option for removal or recovery of base metals from aqueous wastes. The conditions under which precious metals such as gold, platinum and palladium are sorbed by biomass are often very different to those under which base metals are sorbed. This...

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Bibliographic Details
Published in:Biotechnology advances 2007-05, Vol.25 (3), p.264-271
Main Authors: Mack, C., Wilhelmi, B., Duncan, J.R., Burgess, J.E.
Format: Article
Language:English
Subjects:
Adsorption
Biological and medical sciences
Biomass
Biosorption
Biosorption mechanism
Biotechnology
Environment
Fundamental and applied biological sciences. Psychology
Gold
Metals - chemistry
Metals - isolation & purification
Palladium
pH effects
Platinum
Sewage - chemistry
Waste Disposal, Fluid - methods
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Summary:Biosorption has emerged as a low-cost and often low-tech option for removal or recovery of base metals from aqueous wastes. The conditions under which precious metals such as gold, platinum and palladium are sorbed by biomass are often very different to those under which base metals are sorbed. This, coupled with the increasingly high demand for precious metals, drives the increase in research into efficient recovery of precious metal ions from all waste material, especially refining wastewaters. Common biosorbents for precious metal ions include various derivatives of chitosan, as well as other compounds with relatively high surface amine functional group content. This is generally due to the ability of the positively charged amine groups to attract anionic precious metal ions at low pH. Recent research regarding the biosorption of some precious metals is reviewed here, with emphasis on the effects of the biosorption environment and the biosorption mechanisms identified.
ISSN:0734-9750
1873-1899
DOI:10.1016/j.biotechadv.2007.01.003