TY - JOUR
T1 - Sustainable redox processes induced by peroxymonosulfate and metal doping on amorphous manganese dioxide for nonradical degradation of water contaminants
AU - Yang, Yangyang
AU - Zhang, Panpan
AU - Hu, Kunsheng
AU - Duan, Xiaoguang
AU - Ren, Yongxiang
AU - Sun, Hongqi
AU - Wang, Shaobin
N1 - Funding Information:
The authors acknowledge the assistance from Adelaide Microscopy and the analytical lab at the Faculty of Engineering, Computer & Mathematical Sciences (ECMS) at the University of Adelaide. And we appreciate the help of Dr Ben Chambers for XPS test from Flinders Microscopy and Microanalysis. This work was supported by the Australian Research Council (DP190103548).
Funding Information:
The authors acknowledge the assistance from Adelaide Microscopy and the analytical lab at the Faculty of Engineering, Computer & Mathematical Sciences (ECMS) at the University of Adelaide. And we appreciate the help of Dr Ben Chambers for XPS test from Flinders Microscopy and Microanalysis. This work was supported by the Australian Research Council ( DP190103548 ).
Publisher Copyright:
© 2021 Elsevier B.V.
PY - 2021/6/5
Y1 - 2021/6/5
N2 - Manganese oxides have been applied in advanced oxidation processes (AOPs), however, underlying oxidation regimes are still debatable. In this work, we synthesized various crystalline manganese oxides and single or dual metal-doped amorphous MnO2 (M-AMO, M = Fe, Co, Ni, and Cu) for organic oxidation with peroxymonosulfate (PMS). M-AMO at 1 mol% exhibited much higher activities than crystalline manganese oxides and Cu-AMO displayed the rate constant at 3.5 times as high as that of AMO. Different from conventional radical oxidation, nonradical degradation occurred via two pathways. Cu-doping resulted in relatively higher-crystallized structure, more oxygen vacancies, and a higher ratio of Mn4+/Mn3+ for a faster redox cycle between MnⅣ(s) and MnⅢ(s) to boost PMS activation and direct/indirect (Cu-AMO–PMS complex-based) phenol oxidation. This study contributes to a new insight to the structure-catalysis relationship in manganese-catalyzed PMS oxidation. The outcomes will direct the rational synthesis of reaction-oriented catalysts for nonradical AOPs and novel remediation technologies.
AB - Manganese oxides have been applied in advanced oxidation processes (AOPs), however, underlying oxidation regimes are still debatable. In this work, we synthesized various crystalline manganese oxides and single or dual metal-doped amorphous MnO2 (M-AMO, M = Fe, Co, Ni, and Cu) for organic oxidation with peroxymonosulfate (PMS). M-AMO at 1 mol% exhibited much higher activities than crystalline manganese oxides and Cu-AMO displayed the rate constant at 3.5 times as high as that of AMO. Different from conventional radical oxidation, nonradical degradation occurred via two pathways. Cu-doping resulted in relatively higher-crystallized structure, more oxygen vacancies, and a higher ratio of Mn4+/Mn3+ for a faster redox cycle between MnⅣ(s) and MnⅢ(s) to boost PMS activation and direct/indirect (Cu-AMO–PMS complex-based) phenol oxidation. This study contributes to a new insight to the structure-catalysis relationship in manganese-catalyzed PMS oxidation. The outcomes will direct the rational synthesis of reaction-oriented catalysts for nonradical AOPs and novel remediation technologies.
KW - Amorphous manganese dioxide
KW - Electron transfer
KW - Metal doping
KW - Nonradical
KW - Peroxymonosulfate
UR - https://www.scopus.com/pages/publications/85100048968
U2 - 10.1016/j.apcatb.2021.119903
DO - 10.1016/j.apcatb.2021.119903
M3 - Article
AN - SCOPUS:85100048968
SN - 0926-3373
VL - 286
JO - Applied Catalysis B: Environmental
JF - Applied Catalysis B: Environmental
M1 - 119903
ER -