Kinetic and equilibrium studies of copper biosorption onto <Emphasis Type="Italic">Pseudomonas aeruginosa</Emphasis> base using direct determination of copper by a voltammetric method |
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Authors: | Xuefang Li Wanzhi Wei Xiandong Zeng Jinxiang Zeng Jian Yin Ling Wu |
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Institution: | (1) State Key Laboratory of Chemo/Biosensoring and Chemometrics, College of Chemistry and Chemical Engineering, Hunan University, Changsha, Hunan, 410082, P.R. China |
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Abstract: | This paper provided information on the use of linear sweep anodic stripping voltammetry for evaluating the process of copper
biosorption onto Pseudomonas aeruginosa. This technique was suited to determine the concentration of free copper ion on site on the mercaptoethane sulfonate modified
gold electrode surface without any pretreatment. It was in favor of the study of kinetic process as the fast changing kinetic
data characteristic just after the beginning of biosorption could be accurately depicted. Based on the electrochemical results,
the kinetics and equilibrium of biosorption were systematically examined. The pseudo-second-order kinetic model was used to
correlate the kinetic experimental data and the kinetic parameters were evaluated. The Langmuir and Freundlich models were
applied to describe the biosorption equilibrium. It was found that the Langmuir isotherm fitted the experimental data better
than the Freundlich isotherm. Maximum adsorption capacity of copper ion onto Pseudomonas aeruginosa was 0.9355 μmol mg−1 (about 59.4417 mg g−1). |
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Keywords: | Biosorption Copper Linear sweep anodic stripping voltammetry Mercaptoethane sulfonate Pseudomonas aeruginosa |
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