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Catalytic activation of PS/PMS over Fe-Co bimetallic oxides for phenol oxidation under alkaline conditions by Cong Wang; Jingyu Zhao; Congmei Chen; Ping Na is a Materials Science article available to read on EtoBox.

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In this study, we compared the differences between bimetallic oxides FeCo 2 O 4 catalyzing the oxidation of phenol by peroxydisulfate (PS) and peroxymonosulfate (PMS) under near neutral and alkaline conditions. Phenol could be completely oxidized and removed in both PMS and PS systems. X-ray photoelectron spectroscopy (XPS) analysis and density functional theory (DFT) calculations showed that there was a synergistic mechanism between Co and Fe on the catalyst surface. Although the PMS-FeCo 2 O 4 system reached the fastest reaction rate of 1.5 × 10 -1 min -1 , it showed a higher oxidants consumption and more residual total organic carbon (TOC) (36%) in solutions after reactions. Quenching experiments and electron paramagnetic resonance (EPR) analysis showed that sulfate radical (SO 4 •-), hydroxyl radical ( • OH) and singlet oxygen ( 1 O 2 ) played important roles in the oxidation of phenol in PMS system. While in the PS-FeCo 2 O 4 system, in addition to free radical reactions, the non-radical mechanisms between PS and the catalyst surface played a major role in phenol oxidation, and the soluble organic matter in the PS system could be completely removed. Thus, PS has a better appli

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Author

Cong Wang; Jingyu Zhao; Congmei Chen; Ping Na

Publisher

Elsevier BV

Published

2021

Language

EN

Field

Materials Science (Physical Sciences)