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Type: Journal article
Title: Superstructures with Atomic-Level Arranged Perovskite and Oxide Layers for Advanced Oxidation with an Enhanced Non-Free Radical Pathway
Author: Yang, L.
Jiao, Y.
Xu, X.
Pan, Y.
Su, C.
Duan, X.
Sun, H.
Liu, S.
Wang, S.
Shao, Z.
Citation: ACS Sustainable Chemistry and Engineering, 2022; 10(5):1899-1909
Publisher: American Chemical Society Publications
Issue Date: 2022
ISSN: 2168-0485
Statement of
Li Yang, Yong Jiao, Xiaomin Xu, Yangli Pan, Chao Su, Xiaoguang Duan, Hongqi Sun, Shaomin Liu, Shaobin Wang, and Zongping Shao
Abstract: Perovskite-based oxides demonstrate a great catalytic efficiency in advanced oxidation processes (AOPs), where both free and non-free radical pathways may occur. The non-free radical pathway is preferable because it is less affected by the wastewater environment, yet little is known about its origin. Here, we exploit Ruddlesden -Popper (RP) layered perovskite oxides as an excellent platform for investigating the structure - property relationship for peroxymonosulfate (PMS) activation in AOPs. The atomic-level interaction of the perovskite and rock salt layers in RP oxides stabilizes the transition metals at low valences, causing the formation of abundant lattice oxygen/interstitial oxygen species. Unlike oxygen vacancies in conventional perovskites, which promote free-radical generation, these reactive oxygen species in RP perovskites have high activity and mobility and facilitate the formation of non-free radical singlet oxygen. This singlet oxygen reaction pathway is optimized by tailoring the oxygen species, leading to the discovery of LaSrCo0.8Fe0.2O4 with exceptionally efficient PMS activation.
Keywords: Ruddlesden−Popper layered perovskite; non-free radical pathway; reactive oxygen species; interstitial oxygen; peroxymonosulfate
Rights: © 2022, American Chemical Society
DOI: 10.1021/acssuschemeng.1c07605
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Appears in Collections:Chemical Engineering publications

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