Oxygen-vacancy-mediated LaFe1−xMnxO3−δ perovskite nanocatalysts for degradation of organic pollutants through enhanced surface ozone adsorption and metal doping effects. Issue 30 (22nd July 2021)

• Record Type: Journal Article
• Authors: Wang, Shengzhe; Han, Peiwei; Zhao, Ying; Sun, Wenjing; Wang, Rui; Jiang, Xin; Wu, Chunyan; Sun, Chenglin; Wei, Huangzhao
• Is Part Of: Nanoscale. Volume 13:Issue 30(2021)
• Page Start: 12874
• Page End: 12884
• Publication Date: 2021-07-22
• Subjects: Nanoscience -- Periodicals; Nanotechnology -- Periodicals; 620.505
• DOI: 10.1039/d1nr03055h
• Languages: English
• ISSNs: 2040-3364

Abstract

Abstract : LaFe1− x Mn x O3− δ perovskite nanocatalysts accelerate the decomposition of O3 to produce reactive oxygen species (ROS) through enhanced surface ozone adsorption and metal doping effects, and promote the degradation of organic pollutants. Abstract : Here, a series of LaFe1− x Mn x O3− δ perovskite nanocatalysts were synthesized and tested for the catalytic ozonation of m -cresol for the first time. The B-site cation is regulated by metal doping, and the resulting LaFe0.26 Mn0.74 O3− δ with a rhombohedral structure showed excellent catalytic performance and structural stability owing to the abundant oxygen vacancies and the higher Fe 2+ /Fe 3+ and Mn 3+ /Mn 4+ ratios. Theoretical calculations have revealed that the oxygen vacancy has a strong affinity for ozone adsorption, and thus facilitated ozone decomposition by extending the O–O bond. Combined with low-valence Fe 2+ and Mn 3+ cations, the electron transfer in the catalytic ozonation reaction has been enhanced, which has promoted the production of reactive oxygen species (ROS). Taken together, the degradation pathway of m -cresol was proposed. Additionally, the LaFe0.26 Mn0.74 O3− δ catalyst remained stable during a 60 h reaction. This study has not only revealed the adsorption/decomposition pathways of ozone using LaFe0.26 Mn0.74 O3− δ perovskite nanocatalysts but also provided indepth insight into the electron transfer pathway on the surface of nanocatalysts during the process of catalytic ozonation.