Enhanced activation of peroxymonosulfte by LaFeO3 perovskite supported on Al2 O3 for degradation of organic pollutants

Chemosphere
Shaohua WuYuanyuan Zhong

Abstract

In this study, the effect of various supports on activation of peroxymonosulfate and consequent degradation of Acid Orange 7 (AO7) in aqueous solutions was examined at the presence of LaFeO3 perovskite as catalyst. Results showed that the AO7 degradation efficiency by LaFeO3 supported on different supports was in an order of LaFeO3/Al2O3 (86.2%) > LaFeO3 (70.8%) > LaFeO3/CeO2 (59.0%) > LaFeO3/SiO2 (52.3%) > LaFeO3/TiO2 (32.2%). Moreover, the pseudo first-order rate constant for AO7 degradation by LaFeO3/Al2O3 was 3.2 times than that by LaFeO3. The enhancement was attributed to its large surface area, abundant chemisorbed surface-active oxygen, redox property and faster electron transfer. AO7 degradation and the leaching of iron ions decreased with the increase of pH. Data of electron spin resonance spectroscopy and quenching experiments revealed that sulfate and hydroxyl radicals were generated on LaFeO3/Al2O3 surface, while sulfate radicals were identified to be the main reactive species responsible for AO7 degradation. Mechanisms for peroxymonosulfate activation were consequently proposed. Furthermore, LaFeO3/Al2O3 catalyst exhibited a superior stability after five cycles. This work provides a new approach for design of iron-...Continue Reading

Citations

Apr 17, 2020·International Journal of Environmental Research and Public Health·Huiru LiChunping Yang
Feb 26, 2020·International Journal of Environmental Research and Public Health·Huiru LiChunping Yang
Nov 14, 2019·Scientific Reports·Shanying HeChunping Yang
Jul 31, 2021·The Science of the Total Environment·Mudi WuWenguo Xiang

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