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Tabitha Wangui Wanjau

Speaker for catalysis 2017 - Tabitha Wangui Wanjau

Title: Effects of micellar solution on the electrocatalytic activity of cyanocobalamin towards the reduction of organochlorine pesticide 2,2,2-Trichloro-1,1-Bis(4-Chlorophenyl)Ethanol (Dicofol) on a pyrolytic graphite electrode

Tabitha Wangui Wanjau

Kisii University, Kenya


TABITHA WANGUI WANJAU has a PhD degree in Chemistry from Egerton University and currently working with Kisii University as a Lecturer of Chemistry. My PHD thesis was on electrocatalytic decomposition of pesticides and MSc was on water quality. I have a research interest in environmental analytical chemistry and especially electroanalytical techniques and also with regard to residual pesticides and to clean up the environment by removing toxic residues. 


The discussion will be on electrocatalytic reduction of dicofol using cyanocobalamin in micellar solutions.  Anionic surfactant media prepared from sodium didodecyl sulfate (SDS) and water was found to influence the course of electrochemical reactions. A well-defined cyclic voltammmogram for the redox reversible reactions of cyanocobalamin was observed at about -0.750 ± 0.024 V. Dicofol exhibited a single reduction peak at -1.198±0.038 V versus SCE. Cyanocobalamin exhibited a remarkable electrocatalytic activity towards the reduction of dicofol. The electrode processes were diffusion controlled with diffusion coefficients of 7.32 x 10-7 cm2s-1 for dicofol and 1.823x10-8 cm2s-1 for cyanocobalamin. Upon electrocatalysis, the reduction potential for dicofol was shifted to more positive values, exhibiting enhanced reduction current. The enhanced rates were attributed to preconcentration step of the reactants on the electrode surface. The mass transfer electrode process for electrocatalysis was not diffusion-controlled and the current efficiencies decreased with scan rate as expected.

Audience Take away:

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