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

作者：Dai, Weili; Zou, Moliang; Zhao, Chuang; Zhang, Jie^*; Wang, Lvgan; Wang, Xinshan; Yang, Lixia^*; Zhou, Lei; Zou, Jianping; Luo, Xubiao; Luo, Shenglian; Jing, Guohua^*

来源：Applied Catalysis B: Environmental , 2022, 317: 121769.

DOI：10.1016/j.apcatb.2022.121769

• Photothermocatalysis
• Volatile organic compounds
• Na-doped Co3O4 catalyst
• Deep oxidation
• Monoatomic oxygen species

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.

• 单位
  南昌航空大学