Removal and recovery of copper (II) ions by bacterial biosorption |
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Authors: | Wong Mui F Chua Hong Lo Waihung Leung Chu K Yu Peter H F |
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Institution: | (1) Departments of Civil and Structural Engineering, The Hong Kong Polytechnic University, Hung Hom, Hong Kong SAR China;(2) Department of Applied Biology and Chemical Technology and Open Laboratory of Chiral Technology, The Hong Kong Polytechnic University, Hung Hom, Hong Kong SAR, China |
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Abstract: | Studies were conducted toinvestigate the removal and recovery of copper (II) ions from aqueous solutions by Micrococcus sp., which was isolated from a local activated sludge process. The equilibrium of copper biosorption followed the Langmuir
isotherm model very well with a maximum biosorption capacity (qmax) of 36.5 mg of Cu2+/gofdry cell at pH 5.0 and 52.1 mg of Cu2+/g of dry cell at pH 6.0. Cells harvested at exponential growth phase and stationary phase showed similar biosorption characteristics
for copper, Copper uptake by cells was negligible at pH 2.0 and then increased rapidly with increasing pH un til 6.0. In multim
etal systems, Micrococcus sp. exhibited a preferential biosorption order: Cu−Pb>Ni−Zn. There is virtually no interference with copper uptake by Micrococcus sp. from solutions bearing high concentrations of Cl−, SO
4
2−
, and NO3/− (0–500 mg/L). Sulfuric acid (0.05 M) was the most efficient desorption medium, recovering >90% of the initial
copper sorbed. The copper capacity of Micrococcus sp. remained unchanged after five successive sorption and desorption cycles. Immobilization of Micrococcus sp. in 2% calcium alginate and 10% polyacrylamide gel beads increased copper uptake by 61%. Biomass of Micrococcus sp. may be applicable to the development of potentially cost-effective biosorbent for removing and recovering copper from
effluents. |
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Keywords: | Biosorption copper removal biorem ediation immobilization metal adsorption |
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