Optimization of Operating Conditions for Electrochemical Decolorization of Methylene Blue with Ti/α-PbO2/β-PbO2 Composite Electrode

α-PbO2 was introduced into the intermediate layer of an electrode to prevent the separation of the electrodeposited layer and maintain oxidizing power. The resulting Ti/α-PbO2/β-PbO2 composite electrode was applied to the electrochemical decolorization of methylene blue (MB) and the operating condit...

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Bibliographic Details
Published in:Journal of composites science 2021-05, Vol.5 (5), p.117
Main Authors: Molla, Md. Ashraful Islam, Yanagi, Genta, Furukawa, Mai, Tateishi, Ikki, Katsumata, Hideyuki, Kaneco, Satoshi
Format: Article
Language:English
Subjects:
composite
Crystal structure
Decoloring
Dyes
Electrochemical analysis
electrochemical decolorization
Electrochemical impedance spectroscopy
Electrodes
Lead oxides
Methylene blue
Morphology
Optimization
Oxidation
PbO2 electrode
Photoelectrons
purification
Scanning electron microscopy
Titanium
X ray photoelectron spectroscopy
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Summary:α-PbO2 was introduced into the intermediate layer of an electrode to prevent the separation of the electrodeposited layer and maintain oxidizing power. The resulting Ti/α-PbO2/β-PbO2 composite electrode was applied to the electrochemical decolorization of methylene blue (MB) and the operating conditions for MB decolorization with the Ti/α-PbO2/β-PbO2 electrode were optimized. The morphology, structure, composition, and electrochemical performance of Ti/α-PbO2 and Ti/α-PbO2/β-PbO2 anode were evaluated using scanning electron microscopy (SEM), X-ray diffraction (XRD), X-ray photoelectron spectroscopy (XPS), cyclic voltammetry (CV), and electrochemical impedance spectroscopy (EIS). The optimum operating parameters for the electrochemical decolorization of MB at Ti/α-PbO2/β-PbO2 composites were as follows: Na2SO4 electrolyte 0.05 g L−1, initial concentration of MB 9 mg L−1, cell voltage 20 V, current density 0.05–0.10 A cm−2, and pH 6.0. MB dye could be completely decolorized with Ti/α-PbO2/β-PbO2 for the treatment time of less than one hour, and the dye decolorization efficiency with Ti/α-PbO2/β-PbO2 was about 5 times better, compared with those obtained with Ti/α-PbO2.
ISSN:2504-477X
2504-477X
DOI:10.3390/jcs5050117