| Autor: |
Wang D; Key Laboratory of Microbial Technology for Industrial Pollution Control of Zhejiang Province, College of Environment, Zhejiang University of Technology, Hangzhou 310032, China.; School of Environment Science and Spatial Informatics, China University of Mining and Technology, Xuzhou 221116, China., Luo K; Key Laboratory of Microbial Technology for Industrial Pollution Control of Zhejiang Province, College of Environment, Zhejiang University of Technology, Hangzhou 310032, China., Tian H; Key Laboratory of Microbial Technology for Industrial Pollution Control of Zhejiang Province, College of Environment, Zhejiang University of Technology, Hangzhou 310032, China., Cheng H; State Key Laboratory of Urban Water Resource and Environment, School of Environment, Harbin Institute of Technology, Harbin 150090, China., Giannakis S; E.T.S. de Ingenieros de Caminos, Canales Y Puertos, Departamento de Ingeniería Civil: Hidráulica, Energía Y Medio Ambiente, Unidad Docente Ingeniería Sanitaria, Universidad Politécnica de Madrid, C/Profesor Aranguren, S/n, ES-28040 Madrid, Spain., Song Y; School of Civil and Transportation Engineering, Guangdong University of Technology, Guangzhou, 510006 Guangdong, China., He Z; Key Laboratory of Microbial Technology for Industrial Pollution Control of Zhejiang Province, College of Environment, Zhejiang University of Technology, Hangzhou 310032, China., Wang L; School of Environment Science and Spatial Informatics, China University of Mining and Technology, Xuzhou 221116, China., Song S; Key Laboratory of Microbial Technology for Industrial Pollution Control of Zhejiang Province, College of Environment, Zhejiang University of Technology, Hangzhou 310032, China., Fang J; Guangdong Provincial Key Laboratory of Environmental Pollution Control and Remediation Technology, School of Environmental Science and Engineering, Sun Yat-Sen University, Guangzhou 510275, China., Ma J; State Key Laboratory of Urban Water Resource and Environment, School of Environment, Harbin Institute of Technology, Harbin 150090, China. |
| Abstrakt: |
Herein, we propose preferential dissolution paired with Cu-doping as an effective method for synergistically modulating the A- and B-sites of LaMnO 3 perovskite. Through Cu-doping into the B-sites of LaMnO 3 , specifically modifying the B-sites, the double perovskite La 2 CuMnO 6 was created. Subsequently, partial La from the A-sites of La 2 CuMnO 6 was etched using HNO 3 , forming novel La 2 CuMnO 6 /MnO 2 (LCMO/MnO 2 ) catalysts. The optimized catalyst, featuring an ideal Mn:Cu ratio of 4.5:1 (LCMO/MnO 2 -4.5), exhibited exceptional catalytic ozonation performance. It achieved approximately 90% toluene degradation with 56% selectivity toward CO 2 , even under ambient temperature (35 °C) and a relatively humid environment (45%). Modulation of A-sites induced the elongation of Mn-O bonds and decrease in the coordination number of Mn-O (from 6 to 4.3) in LCMO/MnO 2 -4.5, resulting in the creation of abundant multivalent Mn and oxygen vacancies. Doping Cu into B-sites led to the preferential chemisorption of toluene on multivalent Cu (Cu(I)/Cu(II)), consistent with theoretical predictions. Effective electronic supplementary interactions enabled the cycling of multiple oxidation states of Mn for ozone decomposition, facilitating the production of reactive oxygen species and the regeneration of oxygen vacancies. This study establishes high-performance perovskites for the synergistic regulation of O 3 and toluene, contributing to cleaner and safer industrial activities. |
