Kinetic and equilibrium studies for the adsorption process of cadmium(II) and copper(II) onto Pseudomonas aeruginosa using square wave anodic stripping voltammetry method

• Published in: Journal of hazardous materials Vol. 167; no. 1; pp. 455 - 460
• Main Authors: Kong, Bo, Tang, Biyu, Liu, Xiaoying, Zeng, Xiandong, Duan, Haiyan, Luo, Shenglian, Wei, Wanzhi
• Format: Journal Article
• Language: English
• Published: Kidlington Elsevier B.V 15-08-2009; Elsevier
• Subjects: Adsorption; Anodic stripping voltammetry; Applied sciences; Biodegradation, Environmental; Biological and medical sciences; Biosoption; Biotechnology; Cadmium - isolation & purification; Chemical engineering; Copper - isolation & purification; Electrochemical Techniques; Exact sciences and technology; Fundamental and applied biological sciences. Psychology; Kinetics; Kinetics parameters; Mercaptoethane sulfonate; Methods. Procedures. Technologies; Others; Pollution; Pseudomonas aeruginosa; Pseudomonas aeruginosa - metabolism; Simultaneous determination; Various methods and equipments; Water Pollutants, Chemical - isolation & purification; Water Purification; Mercaptoethane sulfonate; Simultaneous determination; Pseudomonas aeruginosa; Biosoption; Kinetics parameters; Anodic stripping voltammetry; Pseudomonadales; Copper II; Second order; Metal ion; Pseudomonas; Modeling; Electrodes; Cadmium II; Bacteria; Pseudomonadaceae; Pretreatment; Stripping; Real time; Real time system; Trace element; Kinetic model; Biosorption; Adsorption; Kinetics; Kinetic parameter
• ISSN: 0304-3894; 1873-3336
• DOI: 10.1016/j.jhazmat.2009.01.010

A novel method for the simultaneous determination of cadmium(II) and copper(II) during the adsorption process onto
Pseudomonas aeruginosa was developed. The concentration of the free metal ions was successfully detected by square wave anodic stripping voltammetry (SWASV) on the mercaptoethane sulfonate (MES) modified gold electrode, while the
P. aeruginosa was efficiently avoided approaching to the electrode surface by the MES monolayer. And the anodic stripping peaks of Cd
2+ and Cu
2+ appear at −0.13 and 0.34
V respectively, at the concentration range of 5–50
μM, the peak currents of SWASV present linear relationships with the concentrations of cadmium and copper respectively. As the determination of Cd
2+ and Cu
2+ was in real time and without pretreatment, the kinetic characteristics of the adsorption process were studied and all the corresponding regression parameters were obtained by fitting the electrochemical experimental data to the pseudo-second-order kinetic model. Moreover, Langmuir and Freundlich models well described the biosorption isotherms. And there were some differences in the amount of metal ion adsorbed at equilibrium (
q
e
) and other kinetics parameters when the two ions coexisted were compared with the unaccompanied condition, which were also discussed in this paper. The proposed electrode system provides excellent platform for the simultaneous determination of trace metals in complex biosorption process.