Abstract
The objective of this study was to investigate the potential for Penicillium sp. QQ to perform copper adsorption. The following optimal conditions were assigned for biosorption by a response surface methodology (RSM): a biomass concentration of 4.6% (w/v), pH of 5.6, initial copper concentration of 100 mg/L and an established biosorption equilibrium after a 30 min reaction. A copper removal efficiency of about 98% was achieved after 30 min. The kinetics of copper adsorption are discussed, and the experimental data are fit to a pseudo-second-order kinetic model. The experimental results were analyzed using the Langmuir and Freundlich isotherms. The equilibrium constant b and n value show copper has been favorably adsorbed by the QQ strain. The thermodynamic parameters such as the free energy (∆Go), enthalpy (∆Ho) and entropy (∆So) also prove the adsorption process was thermodynamically feasible and spontaneous. The results indicate Penicillium sp. QQ could be used as a promising candidate for removing heavy metal ions from aqueous environments.
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