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Type: Journal article
Title: Postsynthesis oxygen nonstoichiometric regulation: a new strategy for performance enhancement of perovskites in advanced oxidation
Author: Miao, J.
Li, J.
Dai, J.
Guan, D.
Zhou, C.
Zhou, W.
Duan, X.
Wang, S.
Shao, Z.
Citation: Industrial and Engineering Chemistry Research, 2020; 59(1):99-109
Publisher: American Chemical Society
Issue Date: 2020
ISSN: 0888-5885
Statement of
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
DOI: 10.1021/acs.iecr.9b05550
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Chemical Engineering publications

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