Decorated CoPc with appliance of MWCNTs on GCE: Sensitive and reliable electrochemical investigation of heavy metals

The electrocatalytic property of Tetra-ethyl-H-1-indazol-3-carboxamide Cobalt (II) Phthalocyanine (CoTEInd-CAPc) with MWCNTs, decorated on glassy carbon electrode (GCE) was investigated. The synthesis of the CoTEIndCAPc was confirmed by various spectroscopic techniques. Successful modification of GCE with the CoTEIndCAPc and their composite was also confirmed using cyclic voltammetry (CVs), differential pulse voltammetry (DPV) and chrono-amperometry (CA) techniques. CoTEIndCAPc/MWCNTs/GC electrode was the best electrode towards Cd2+ and Pb2+ detection with a very low detection limit (10 and 9 nmol L-1) by CVs method, which compared favorably with literature, good sensitivity, electrocatalytic oxidation of Cd2+ and Pb2+ on CoTEIndCAPc/MWCNTs/GC electrode was diffusion controlled but characterized with some adsorption of electro-oxidation reaction intermediates products. The fabricated sensors are easy to prepare, cost-effective and can be applied for real sample analysis of Cd2+ and Pb2+ in river water. The excellent electrocatalytic property of CoTEIndCAPc/MWCNTs/GC electrode is high reproducibility, repeatability and selectivity.

Automated summary

The CoTEIndCAPc/MWCNTs/GC electrode showed excellent electrocatalytic properties for detecting Cd2+ and Pb2+ with high sensitivity and diffusion-controlled electro-oxidation of the analytes. The fabricated sensors are cost-effective, easy to prepare, and suitable for real sample analysis.