Electrochemical oxidation of a complex mixture of phenolic compounds in the base media using PbO2-GNRs anodes
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AuthorsSavić, Branislava G.
Tasić, Gvozden S.
Mihajlović, Ivana J.
Brdarić, Tanja P.
Article (Published version)
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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 electrolys...is 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.
Keywords:Base medium / Electrochemical oxidation / PbO-GNRs / Phenolic compounds / Wastewater treatment
Source:Applied Surface Science, 2020, 529, 147120-
- Ministarstvo Prosvete, Nauke i Tehnološkog Razvoja - Eureka project E!13303 MED-BIO-TEST
- Supplementary material: https://cherry.chem.bg.ac.rs/handle/123456789/4207