Crystallinity and valence states of manganese oxides in Fenton-like polymerization of phenolic pollutants for carbon recycling against degradation

Yang, Yangyang ¹Zhang, Panpan ¹Hu, Kunsheng ¹Zhou, Peng ¹Wang, Yuxian ²Asif, Abdul Hannan ³Duan, Xiaoguang ¹Sun, Hongqi ³Wang, Shaobin¹

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作者信息

1. Univ Adelaide
2. China Univ Petr
3. Edith Cowan Univ
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Abstract

Various MnOx phases and crystals were investigated in peroxymonosulfate (PMS) activation for oxidation of aqueous phenolic pollutants. MnOx with controlled crystal structure (alpha, beta, gamma, and amorphous-MnO2) and redox states (Mn2O3, and MnO) can induce different oxidative pathways toward organic polymerization against degradation in acidic conditions. Surface Mn-(s())II and Mn-(s)(III) of MnOx tend to bond with PMS to generate confined Mn-(s)((II, III))-(HO)OSO3- complexes to initiate a nonradical electron-transfer pathway (ETP). Meanwhile, high valence Mn/vs) in MnOx will directly attack micropollutants and spontaneously be reduced to low-valence states (Mn-(s)(II) and Mn-(s())III to initiate ETP. Mn2O3 can activate PMS to generate other radical species for mineralization. ETP will selectively initiate one-electron abstraction of phenol molecules into monomer phenoxy radicals and polyphenols on catalyst surface. Thus, manganese crystal structures will govern the surface redox species to induce multiple oxidation pathways toward different polymer products for water decontamination and carbon recycle.

Key words

Manganese oxide/Peroxymonosulfate/Nonradical/Electron-transfer pathway/Polymerization/NONRADICAL ACTIVATION/EFFICIENT ACTIVATION/OXIDATION-KINETICS/RICE STRAW/PEROXYMONOSULFATE/MNO2/PEROXYDISULFATE/PERSULFATE/BROMOPHENOLS/PERFORMANCE

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出版年

2022

Applied Catalysis

ISSN：0926-3373

被引量35

参考文献量54

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