Journal of Environmental Biology

Biosorption of Cu²⁺ from aqueous solutions by pretreated Cladosporium sp.

 

Dong Xinjiao

School of Life and Environmental Science, Wenzhou University, Wenzhou 325 003, China

 

(Received: 21 July, 2005 ; Accepted: 26 December, 2005)

 

 

Abstract: In this paper, adsorption properties of a pretreated of Cladosporium sp.for Cu²⁺ were studied. The fungi pretreated with some chemical reagents exhibited higher Cu²⁺ removal capacities than native biomass. The optimum chemical reagent was 0.2M NaOH. After 0.2M NaOH pretreatment, optimum conditions of biosorption were found to be pH 5.0, temperature 35?C, and stirring speed of 100rpm. Equilibrium isotherms were obtained from adsorption experiments and? the biosorption maximun capacity obtained was at 28.31mg/g. The biosorbed metal ions were effectively eluted by 0.05M HNO₃ solution. After eluting, the biosorbed metal ions biomass was regenerated by washing with deionized water and then contacted with a solution containing 0.1M of Ca²⁺, Mg²⁺ ions before further adsorption tests. The pretreated fungi biomass could be used for three cycles: biosorption, elution of biosorbed ion, regeneration of biomass.

 

Key words: Biosorption, Cladosporium sp., Mycelial pellets, Pretreated, Cu²⁺.

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