Electrocatalytic behavior of cobalt phthalocyanine complexes immobilized on glassy carbon electrode towards the reduction of dicrotophos pesticide

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  • Sibulelo Vilakazi
    Nanotechnology Innovation Centre, Advanced Materials Division, Mintek, Private Bag X3015, Randburg, South Africa
  • Tebello Nyokong
    Department of Chemistry, Rhodes University, Grahamstown 6140, South Africa
  • Takamitsu Fukuda
    Department of Chemistry, Graduate School of Science, Tohoku University, Sendai, Japan
  • Nagao Kobayashi
    Department of Chemistry, Graduate School of Science, Tohoku University, Sendai, Japan

説明

<jats:p> Electrocatalytic properties of cobalt phthalocyanine (CoPc), cobalt tetra-carboxy phthalocyanine (CoTCPc) and cobalt octa-carboxy (CoOCPc), towards the detection of dicrotophos have been studied. Catalytic behavior towards the reduction of dicrotophos was found to be dependent on the pH, as well as the substitution on the phthalocyanine ring. Strong electron withdrawing groups on the phthalocyanine ring yielded best catalysis as evidenced by the enhancement of the reduction peak current, (~5 fold) compared to the bare glassy carbon electrode. The analysis gave a good detection limit of 1.25 × 10<jats:sup>-7</jats:sup> M, and good linearity for the studied concentration range. A high Tafel slope value was obtained, indicating a strong interaction between dicrotophos and the cobalt phthalocyanine complex. </jats:p>

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