Effective mineralization of p-nitrophenol by catalytic ozonation using Ce-substituted La1-xCexFeO3 catalyst

被引：28

作者：

Ren, Hongfei ^{[1
]}

Wang, Zexiang ^{[1
]}

Chen, Xiaoming ^{[1
]}

Jing, Zhenyang ^{[1
]}

Qu, Zhengjun ^{[1
]}

Huang, Lihui ^{[1
]}

机构：

[1] Shandong Univ, Sch Environm Sci & Engn, Shandong Key Lab Water Pollut Control & Resource, Qingdao 266237, Peoples R China

来源：

CHEMOSPHERE | 2021年 / 285卷

关键词：

Heterogeneous catalytic ozonation; Perovskite; Mineralization; Catalytic mechanism; ACTIVATED CARBON; MIXED OXIDES; DEGRADATION; OXIDATION; REDUCTION; ACID; PEROVSKITES; PERFORMANCE; MECHANISM; NO;

D O I：

10.1016/j.chemosphere.2021.131473

中图分类号：

X [环境科学、安全科学];

学科分类号：

08 ; 0830 ;

摘要：

In this study, cerium-doped lanthanum ferrite perovskite oxides (La1-xCexFeO3) with different A-site were synthesized using a sol-gel method and they were used as ozonation catalyst for p-nitrophenol (PNP) mineralization for the first time. Catalytic activity in terms of total organic carbon (TOC) removal followed the order of La0.8Ce0.2FeO3 > La0.4Ce0.6FeO3 > La0.6Ce0.4FeO3 > La0.2Ce0.8FeO3 > LaFeO3 with 77, 66, 61, 60 and 56% respectively. The synthesized catalysts were characterized by diffraction of X-ray (XRD), Raman spectroscopy, Brunauer-Emmett-Teller (BET) and scanning electronic microscopy (SEM). Moreover, electron spin resonance (ESR) and radicals quenching experiments showed that the active oxygen species in the ozone decomposition process are mainly hydroxyl radical (center dot OH), and also include superoxide radical (O-2(-)) and singlet oxygen (O-1(2)). Furthermore, the superior activity of La0.8Ce0.2FeO3 could be attributed to the higher surface area, the richer lattice oxygen, richer surface -OH groups and the facilitated redox Ce3+/Ce4+ and Fe2+/Fe3+ cycling. In addition, this study provides an insight to use metal-doped perovskite catalysts for catalytic ozonation.

引用

页数：8

共 46 条

[1] Catalytic performance and an insight into the mechanism of CeO2 nanocrystals with different exposed facets in catalytic ozonation of p-nitrophenol [J].