Sensitive voltammetric determination of 2-mercaptobenzimidazole at electropolymerized nickel and copper tetraaminophthalocyanine membrane modified electrode |
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Authors: | Jie-Ping Fan Xiao-Min Zhang Min Ying |
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Institution: | (1) School of Environmental Science and Engineering, Nanchang University, Nanchang, 330031, People’s Republic of China;(2) Zhejiang Wanli University, Ningbo, 315100, People’s Republic of China;(3) East China Institute of Technology, Fuzhou, 344100, People’s Republic of China |
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Abstract: | The voltammetric determination of 2-mercaptobenzimidazole (MBI) was studied by using a glassy carbon electrode (GCE) coated
with polymeric nickel and copper tetraaminophthalocyanine (poly-NiTAPc and poly-CuTAPc) membrane. The polymeric membrane decreases
the overpotential of oxidation of MBI by 136.2 and 115.0 mV and increases the oxidation peak current by about 3.4 and 3.3
times, while the reduction peak potential shifts positively by 113.0 and 84.1 mV and the peak current increases by about 10
and 7 times in 0.1 mol·l−1 phosphate buffer solution (PBS) at pH = 2.0 for poly-NiTAPc and poly-CuTAPc, respectively, compared to the unmodified GCE.
The results indicated that the developed electrode exhibited efficient electrocatalytic activity for MBI with relatively high
sensitivity, stability, and long life. The oxidation and reduction peak currents of MBI were linear to its concentrations
ranging from 8.0 × 10−5 to 1.0 × 10−3 mol·l−1 at poly-NiTAPc and from 2.0 × 10−5 to 1.0 × 10−3 mol·l−1 at poly-NiTAPc membranes modified electrodes, respectively, with a low limit of detection. |
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Keywords: | Electrocatalysis 2-Mercaptobenzimidazole Nickel tetraaminophthalocyanine Copper tetraaminophthalocyanine Cyclic voltammetry |
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