Synergistic degradation of phenols using peroxymonosulfate activated by CuO-Co3O4@MnO2nanocatalyst.
The development of transition metal based heterogeneous catalysts with efficient reactivity and intensive stability is of great demand in peroxymonosulfate based AOPs in water treatment. Herein, we present a novel approach of creating stable and effective nano-rod catalyst of CuCo@MnO2with tetragonal structure. A remarkable synergetic effect was found between bi-metallic oxides of Cu and Co: 0.5%Cu-2%Co-MnO2can efficiently degrade 100% of 30ppm phenol, while 0.5%Cu@MnO2or 2%Co@MnO2alone is apparently sluggish for the degradation of organic contaminants. The nanocatalyst retained good stability in recycling tests, during which little leaching of Co and Cu ions can be detected and crystallinity of support α-MnO2remained unchanged. Mechanism study indicated that SO4-and OH are accounted to participate the degradation, and the generation of radicals is originated from the interaction of CuCo@MnO2and PMS through metal site with peroxo species bond. The redox cycle among the active metals (M2+↔M3+↔M2+) and Cu enhanced generation of Co(II)-OH complex are critical for the remarkable performance in CuCo@MnO2/PMS system. Both the synergetic acceleration of catalyst activity and instinct mechanism are highly suggestive to the design of heterogeneous catalysts for the degradation of organic contaminants in PMS based advanced oxidation processes.
Key laboratory of Material Chemistry for Energy Conversion and Storage, Ministry of Education, Hubei Key laboratory of Material Chemistry and Service Failure, School of Chemistry and Chemical Engineering, Huazhong University of Science and Technology, Wuhan 430074, PR China; Shenzhen Huazhong University of Science and Technology Research Institute, PR China.
Aimal
A
Khan
School of Environmental Science and Engineering, Huazhong University of Science and Technology, Wuhan 430074, PR China.
Zhuwei
Z
Liao
School of Environmental Science and Engineering, Huazhong University of Science and Technology, Wuhan 430074, PR China.
Yong
Y
Liu
School of Environmental Science and Engineering, Huazhong University of Science and Technology, Wuhan 430074, PR China.
Ali
A
Jawad
Key laboratory of Material Chemistry for Energy Conversion and Storage, Ministry of Education, Hubei Key laboratory of Material Chemistry and Service Failure, School of Chemistry and Chemical Engineering, Huazhong University of Science and Technology, Wuhan 430074, PR China.
Jerosha
J
Ifthikar
Key laboratory of Material Chemistry for Energy Conversion and Storage, Ministry of Education, Hubei Key laboratory of Material Chemistry and Service Failure, School of Chemistry and Chemical Engineering, Huazhong University of Science and Technology, Wuhan 430074, PR China; Shenzhen Huazhong University of Science and Technology Research Institute, PR China. Electronic address: zqchen@hust.edu.cn.
Zhuqi
Z
Chen
Advanced oxidation processes; Mesoporous MnO(2); Peroxymonosulfate; Sulfate radicals; Supported Cu and Co oxide