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|Title:||Postsynthesis oxygen nonstoichiometric regulation: a new strategy for performance enhancement of perovskites in advanced oxidation|
|Citation:||Industrial and Engineering Chemistry Research, 2020; 59(1):99-109|
|Publisher:||American Chemical Society|
|Jie Miao, Jiang Li, Jie Dai, Daqin Guan, Chuan Zhou, Wei Zhou, Xiaoguang Duan, Shaobin Wang, and Zongping Shao|
|Abstract:||Due to their flexible physiochemical properties and defect-rich structures, perovskite oxides have drawn increasing attention as efficient heterogeneous catalysts for peroxymonosulfate (PMS) activation in wastewater remediation. Herein, we reported a new nondoping strategy of postsynthesis oxygen nonstoichiometric regulation for LaMnO₃₊δ (LMO) at various oxygen partial pressures and calcination temperatures, named as LMO-P-T, to control its interstitial oxygen defect content, resulting in the enhancement of its catalytic activity and stability for degradation of rhodamine B (RhB). The defect structure, charge-transfer capacity, and resistance against metal leaching of LMO were thus improved. Specifically, LMO-5 bar-600 with the highest defect content presented excellent Fenton-like activity, 1.76 times that of LMO. Favorable singlet oxygen was confirmed as the dominant reactive species in the LMO-5 bar-600/PMS system, and the obtained catalysts showed satisfactory activity in a wide initial pH range. This work might provide a universal approach in designing metal oxides catalysts for efficient advanced oxidation.|
|Rights:||© 2019 American Chemical Society|
|Appears in Collections:||Chemical Engineering publications|
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