Electrochemical oxidation of a complex mixture of phenolic compounds in the base media using PbO2-GNRs anodes

• Published in: Applied surface science Vol. 529; p. 147120
• Main Authors: Savić, Branislava G., Stanković, Dalibor M., Živković, Sanja M., Ognjanović, Miloš R., Tasić, Gvozden S., Mihajlović, Ivana J., Brdarić, Tanja P.
• Format: Journal Article
• Language: English
• Published: Elsevier B.V 01.11.2020
• Subjects: Base medium; Electrochemical oxidation; PbO2-GNRs; Phenolic compounds; Wastewater treatment; Base medium; PbO2-GNRs; Phenolic compounds; Wastewater treatment; Electrochemical oxidation
• ISSN: 0169-4332; 1873-5584
• DOI: 10.1016/j.apsusc.2020.147120

[Display omitted] •A novel PbO2-GNRs nanocomposite anode was synthesized and characterized.•The electrochemical degradation of phenols on PbO2-GNRs anode in alkaline solution was investigated.•Removal efficiency of phenolic compounds increased up to 78% for 300 min and potential of 3 V.•Mechanism of degradation is based on dechlorination and demethylation followed by aromatic ring degradation.•Newly synthesized PbO2-GNRs could be implemented in wastewater treatment of phenolic compounds. A novel anode based on PbO2-GNRs nanocomposites was synthesized in order to investigate the simultaneous electrochemical oxidation of phenolic compounds in a mixture of methyl and chloro substituted phenols in alkaline solution (pH = 8.3). The crystal structure, morphology and composition of the synthesized materials were characterized using X-ray powder diffraction (XRPD), field emission scanning electron microscopy with energy dispersive X-ray spectrometer (FESEM-EDX) and transmission electron microscopy (TEM). FESEM images confirmed the presence of PbO2 nanoparticles on the PbO2-GNRs composite. The cyclic voltammetry measurements of the PbO2-GNRs electrode in 0.1 M Na2SO4 electrolyte indicated the electrochemical oxidation of phenol via indirect mechanism by hydroxyl radicals. Electrolytic oxidation of phenolic compounds was performed under potentiostatic conditions at potentials 2.3 V and 3 V. Removal efficiency of phenolic compounds increased with increasing the time of electrolysis and applied potential, up to 78% for 300 min and potential of 3 V. GC–MS chromatograms confirmed that mechanism of phenolic compounds degradation is based on their dechlorination and demethylation followed by the process of aromatic ring degradation. Newly synthesized PbO2-GNRs as electrode material could be successfully implemented in wastewater treatment of phenolic compounds by the electrochemical oxidation process.