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Enhanced Interfacial Electron Transfer by Asymmetric Cu-Ov-In Sites on In2O3 for Efficient Peroxymonosulfate Activation |
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| Authors: | Zhiyong Zhao Dr Pengfei Wang Chunlin Song Tao Zhang Prof Sihui Zhan Prof Yi Li |
| Institution: | 1. MOE Key Laboratory of Pollution Processes and Environmental Criteria, Tianjin Key Laboratory of Environmental Remediation and Pollution Control, College of Environmental Science and Engineering, Nankai University, Tianjin, 300350 P. R. China
These authors contributed equally to this work.;2. School of Energy and Environmental Engineering, Hebei University of Technology, Tianjin, 300401 P. R. China These authors contributed equally to this work.;3. MOE Key Laboratory of Pollution Processes and Environmental Criteria, Tianjin Key Laboratory of Environmental Remediation and Pollution Control, College of Environmental Science and Engineering, Nankai University, Tianjin, 300350 P. R. China;4. Tianjin Key Laboratory of Molecular Optoelectronic Sciences, Department of Chemistry, School of Science, Collaborative Innovation Center of Chemical Science and Engineering (Tianjin), Tianjin University, Tianjin, 300072 P. R. China |
| Abstract: | Enhancing the peroxymonosulfate (PMS) activation efficiency to generate more radicals is vital to promote the Fenton-like reaction activity, however, how to promote the PMS adsorption and accelerate the interfacial electron transfer to boost its activation kinetics remains a great challenge. Herein, we prepared Cu-doped defect-rich In2O3 (Cu-In2O3/Ov) catalysts containing asymmetric Cu−Ov−In sites for PMS activation in water purification. The intrinsic catalytic activity is that the side-on adsorption configuration of the O−O bond (Cu−O−O−In) at the Cu-Ov-In sites significantly stretches the O−O bond length. Meanwhile, the Cu-Ov-In sites increase the electron density near the Fermi energy level, promoting more and faster electron transfer to the O−O bond for generating more SO4⋅− and ⋅OH. The degradation rate constant of tetracycline achieved by Cu-In2O3/Ov is 31.8 times faster than In2O3/Ov, and it shows the possibility of membrane reactor for practical wastewater treatment. |
| Keywords: | Asymmetric Cu-Ov-In sites Electron Transfer Fenton-Like Reaction PMS Activation Sulfate and Hydroxyl Radicals |