Poly(crystal violet) Films Modified Electrode for Adrenaline Detection: Optimization and Voltammetric Studies

2021 ◽  
Vol MA2021-02 (57) ◽  
pp. 1900-1900
Author(s):  
Saheed E Elugoke ◽  
Omolola Esther Fayemi ◽  
A.S. Adekunle ◽  
Eno Effiong Ebenso
Keyword(s):  
Modified Electrode ◽  
Crystal Violet ◽  
Voltammetric Studies

Effective Electro-Fenton Degradation of Reactive Black 5 Dye using Modified Electrode with Cu-Zeolites

2014 ◽  
Vol 17 (2) ◽  
pp. 071-075 ◽  
Author(s):  
Miguel A. Oliver-Tolentino ◽  
Elmer Jiménez-Álvarez ◽  
María De Jesús Martínez-Ortiz ◽  
Efrén García-Báez ◽  
M. Olivia Franco-Hernández ◽  
...  
Keyword(s):  
Hydroxyl Radical ◽  
Modified Electrode ◽  
Azo Dye ◽  
Reactive Black 5 ◽  
Ionic Exchange ◽  
Cathodic Peak ◽  
Acidic Properties ◽  
Kinetics Parameters ◽  
Electrocatalytic Mechanism ◽  
Voltammetric Studies

The electrocatalytic production of hydroxyl radical (HO•) on the surface of zeolite modified electrode (ME) employing Cu-Zeolites (ZSM5 and β) with different theoretical ionic exchange (15 and 100%) was investigated (ME/Cu-Zeolites). The i-E characteristic of ME/Cu-ZSM-5 presented the faradic process associated to redox couple Cu2+/Cu+. On the other hand, voltammetric studies showed that in presence of H2O2, the cathodic peak current of ME/Cu-Zeolites increases followed by a decrease in the corresponding anodic current. This suggested that hydroxyl radical was produced by a cooperative effect of the acidic properties of zeolite and copper that acts as a redox mediator on the electrode surface via an electrocatalytic mechanism. Experiments of degradation using azo dye Reactive Black 5 as probe molecule exhibited that the concentration of azo dye decreased in the time, this confirms the formation of hydroxyl radical on the surface of modified electrode; kinetics parameters demonstrated that the ME/Cu- β with 15% of ionic exchange presented the highest catalytic activity.

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