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Roushan Khoshnavazi

Roushan Khoshnavazi

Academic rank: Associate Professor
ORCID:
Education: PhD.
ScopusId: 6506671795
Faculty: Faculty of Science
Address: Department of Chemistry, University of Kurdistan, P.O.Box 66135-416, Sanandaj, Iran
Phone:

Research

Title
Immobilization of [Cu(bpy)2]Br2 complex onto a glassy carbon electrode modified with -SiMo12O40 4− and single walled carbon nanotubes: Application to nanomolar detection of hydrogen peroxide and bromate
Type
JournalPaper
Keywords
Immobilization; [Cu(bpy)2]Br2 complex; -SiMo12O40 4−; carbon nanotubes
Year
2009
Journal ANALYTICA CHIMICA ACTA
DOI
Researchers Abdollah Salimi ، Azam korani ، Rahman Hallaj ، Roushan Khoshnavazi ، Hasan Hadadzadeh

Abstract

A simple procedure has been used for preparation of modified glassy carbon electrode with carbon nanotubes and copper complex. Copper complex [Cu(bpy)2]Br2 was immobilized onto glassy carbon (GC) electrode modified with silicomolybdate, -SiMo12O40 4− and single walled carbon nanotubes (SWCNTs). Copper complex and silicomolybdate irreversibly and strongly adsorbed onto GC electrode modified with CNTs. Electrostatic interactions between polyoxometalates (POMs) anions and Cu-complex, cations mentioned as an effective method for fabrication of three-dimensional structures. The modified electrode shows three reversible redox couples for polyoxometalate and one redox couple for Cu-complex at wide range of pH values. The electrochemical behavior, stability and electron transfer kinetics of the adsorbed redox couples were investigated using cyclic voltammetry. Due to electrostatic interaction, copper complex immobilized onto GC/CNTs/-SiMo12O40 4− electrode shows more stable voltammetric response compared to GC/CNTs/Cu-complex modified electrode. In comparison to GC/CNTs/Cu-complex the GC/CNTs/-SiMo12O40 4− modified electrodes shows excellent electrocatalytic activity toward reduction H2O2 and BrO3 − at more reduced overpotential. The catalytic rate constants for catalytic reduction hydrogen peroxide and bromate were 4.5(±0.2)×103M−1 s−1 and 3.0(±0.10)×103M−1 s−1, respectively. Thehydrodynamicamperommetry technique at 0.08Vwas usedfor detection of nanomolar concentration of hydrogen peroxide and bromate. Detection limit, sensitivity and linear concentration range proposed sensor for bromate and hydrogen peroxide detection were 1.1 nM and 6.7 nAnM−1, 10nM–20M, 1 nM, 5.5 nAnM−1 and 10nM–18M, respectively.