Abstract
Biosorption of silver ions onto A. chroococcum XU1 biomass and exopolysaccharide (EPS) was investigated. It was found that the overall biosorption process was the best when cell biomass and EPS were used together. Metal adsorption experiments showed that the final precipitate obtained by cell biomass and EPS, contained 7.85% of Ag. Based on the results presented in this study, the biomass and EPS of A. chroococcum XU1 indicated the possibility of application of them as biosorbent for removal of silver from waste waters.
Highlights
Microorganisms and microbial products can be highly efficient bioaccumulators of soluble and particulate forms of metals, especially from dilute external solutions, and microbe-related technologies may provide an alternative or adjunct to conventional techniques of metal removal/recovery [1]
The present work investigates the potential use of Azotobacter chroococcum XU1 biomass and its exopolysaccharide as metal sorbent to remove silver from aqueous solutions
A. chroococcum XU1 revealed high adsorption rate and played a major role in immobilization of heavy metals, such as Hg and Pb [5], but its biomass was not tested for heavy metals removal from aqueous solutions
Summary
Microorganisms and microbial products can be highly efficient bioaccumulators of soluble and particulate forms of metals, especially from dilute external solutions, and microbe-related technologies may provide an alternative or adjunct to conventional techniques of metal removal/recovery [1]. The use of biomass for the uptake of heavy metals has been extensively studied over last decade and it may represent an alternative for the existing technologies. (2015) Removal of Silver from Aqueous Solution by Azotobacter chroococcum XU1 Biomass and Exopolysaccharide. Certain types of microbial exopolysaccharides (EPS) can adsorb relatively high quantities of metals by means of passive processes known as biosorption, which is dependent on the affinity between the metallic species or its ionic forms and the binding sites on the molecular structure of the microbial EPS [4] [5]. The present work investigates the potential use of Azotobacter chroococcum XU1 biomass and its exopolysaccharide as metal sorbent to remove silver from aqueous solutions. The overall kinetics of silver biosorption is studied
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