Abstract

Introduction: Electrochemical oxidation of Alizarin Yellow R (AYR) was investigated on Ytterbium (Yb) doped Ti/PbO₂ electrodes prepared by an electrodeposition method

Method:The etching of the Ti sheet by using a mixed acid of H2SO4 and TA (volume ratio= 2: 1) for 50 min at 100°C could produce a suitable interface for further modification. The morphologies, composition, and electrochemical properties of Yb doping on the electrode were characterized by SEM (Scanning Electron Microscopy), EDS (Energy-Dispersive Spectroscopy), Cyclic Voltammetry (CV) and Electrochemical Impedance Spectroscopy (EIS). The introduction of an appropriate intermediate layer, Zr-SnO₂, was performed. We also tried to fabricate Ytterbium (Yb) doped Ti/Zr-SnO₂/PbO₂ electrodes by an electrodeposition method on the intermediate layer of Zr-SnO₂. The surface morphology of the Ti/Zr-SnO₂/PbO₂ electrode was changed due to the Yb doping, which affected the electrocatalytic activity of the modified electrode.

Result: The developed Yb-doped Ti/Zr-SnO₂/PbO₂ electrode showed improved removal efficiencies toward AYR.

Conclusion: The effects of current density and initial AYR concentration on the electrochemical oxidation of AYR by Yb-doped Ti/Zr-SnO₂/PbO₂ were investigated. The removal rate of AYR was 97.3% in 180 min under the conditions of the current density of 60 mA/cm2, initial AYR concentration of 50.0 mg L-1, and Na2SO4 concentration of 0.10 mol L-1.

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Keywords: Alizarin yellow R, electrochemical oxidation, Ti/PbO₂, Ytterbium doping, electrocatalytic, degradation, electrodes.