Monoatomic oxygen fueled by oxygen vacancies governs the photothermocatalytic deep oxidation of toluene on Na-doped Co3O4

被引：57

作者：

Dai, Weili ^{[1
]}

Zou, Moliang ^{[1
]}

Zhao, Chuang ^{[1
]}

Zhang, Jie ^{[1
]}

Wang, Lvgan ^{[1
]}

Wang, Xinshan ^{[1
]}

Yang, Lixia ^{[1
]}

Zhou, Lei ^{[1
]}

Zou, Jianping ^{[1
]}

Luo, Xubiao ^{[1
]}

Luo, Shenglian ^{[1
]}

Jing, Guohua ^{[2
]}

机构：

[1] Nanchang Hangkong Univ, Key Lab Jiangxi Prov Persistent Pollutants Control, Nanchang 330063, Jiangxi, Peoples R China

[2] Huaqiao Univ, Coll Chem Engn, Dept Environm Sci & Engn, Xiamen 361021, Fujian, Peoples R China

来源：

APPLIED CATALYSIS B-ENVIRONMENT AND ENERGY | 2022年 / 317卷

基金：

中国国家自然科学基金;

关键词：

Photothermocatalysis; Volatile organic compounds; Na-doped Co3O4 catalyst; Deep oxidation; Monoatomic oxygen species; MOLECULAR-OXYGEN; PERFORMANCE; EXCHANGE; COMBUSTION; NANOSHEETS; POTASSIUM; SPINEL; TIO2; CO;

D O I：

10.1016/j.apcatb.2022.121769

中图分类号：

O64 [物理化学（理论化学）、化学物理学];

学科分类号：

070304 ; 081704 ;

摘要：

Reported herein is a study of oxygen vacancies (OVs) provoking the complete mineralization of toluene with Na-doped Co3O4 as a photothermal catalyst. Doping Na+ into Co(3)O(4 )leads to distortion and charge disequilibrium in the Co3O4 lattice, which generates abundant OVs. OVs work as specific centers to convert the absorbed O-2 molecules to the active oxygen species O-. Abundant O- radicals boost the outermost decomposition of toluene. Comparing the optimal Na-doped Co3O4 (3%Na-Co3O4) with the pristine Co3O4, despite almost the same removal efficiency (100%) on them, the 3%Na-Co(3)O(4 )significantly outperforms Co(3)O(4 )concerning the CO2 yield in the photothermocatalytic oxidation of toluene under full-spectrum light irradiation (425 mW/cm(2); equilibrium temperature of 218 ?). A mineralization degree of 89.8% is achieved on 3%Na-Co3O4, which is 7-fold higher than that over Co3O4. The OVs also help render the high sustainability of 3%Na-Co3O4, which maintains its outstanding performance even after 10 successive runs.

引用

页数：12

共 51 条

[11] Introduce oxygen vacancies into CeO2 catalyst for enhanced coke resistance during photothermocatalytic oxidation of typical VOCs [J].