Enhanced activation of peroxymonosulfte by LaFeO3 perovskite supported on Al2O3 for degradation of organic pollutants

被引：81

作者：

Wu, Shaohua ^{[1
,2
,3
]}

Lin, Yan ^{[1
,2
,3
]}

Yang, Chunping ^{[1
,2
,3
,4
]}

Du, Cheng ^{[1
,4
]}

Teng, Qing ^{[1
,4
]}

Ma, Yin ^{[1
,4
]}

Zhang, Dongmei ^{[1
,4
]}

Nie, Lijun ^{[1
,4
]}

Zhong, Yuanyuan ^{[1
,4
]}

机构：

[1] Guangdong Univ Petrochem Technol, Sch Environm Sci & Engn, Maoming 525000, Guangdong, Peoples R China

[2] Hunan Univ, Coll Environm Sci & Engn, Changsha 410082, Hunan, Peoples R China

[3] Hunan Univ, Key Lab Environm Biol & Pollut Control, Minist Educ, Changsha 410082, Hunan, Peoples R China

[4] Guangdong Univ Petrochem Technol, Guangdong Prov Key Lab Petrochem Pollut Proc & Co, Maoming 525000, Guangdong, Peoples R China

来源：

CHEMOSPHERE | 2019年 / 237卷

基金：

中国国家自然科学基金;

关键词：

Support; Perovskite; Peroxymonosulfate; Degradation kinetic; Sulfate radical; FENTON-LIKE DEGRADATION; HETEROGENEOUS CATALYST; EFFICIENT DEGRADATION; ADVANCED OXIDATION; REMOVAL PERFORMANCE; BISPHENOL-A; ATRAZINE; CARBON; WATER; MECHANISM;

D O I：

10.1016/j.chemosphere.2019.124478

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, 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 AO(7) 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. AO(7) 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 AO(7) 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-based perovskite catalysts with high and stable catalytic activity for removal of organic pollutants from aqueous solutions. (C) 2019 Elsevier Ltd. All rights reserved.

引用

页数：12

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