Insight into the Mechanism and Kinetics of the Heterogeneous Reaction between SO 2 and NO 2 on Diesel Black Carbon under Light Irradiation.

Autor:	Zhang P; State Key Joint Laboratory of Environment Simulation and Pollution Control, Research Center for Eco-Environmental Sciences, Chinese Academy of Sciences, Beijing 100085, China.; University of Chinese Academy of Sciences, Beijing 100049, China., Wang Y; State Key Joint Laboratory of Environment Simulation and Pollution Control, Research Center for Eco-Environmental Sciences, Chinese Academy of Sciences, Beijing 100085, China.; University of Chinese Academy of Sciences, Beijing 100049, China., Chen T; State Key Joint Laboratory of Environment Simulation and Pollution Control, Research Center for Eco-Environmental Sciences, Chinese Academy of Sciences, Beijing 100085, China.; University of Chinese Academy of Sciences, Beijing 100049, China., Yu Y; State Key Joint Laboratory of Environment Simulation and Pollution Control, Research Center for Eco-Environmental Sciences, Chinese Academy of Sciences, Beijing 100085, China.; University of Chinese Academy of Sciences, Beijing 100049, China.; Center for Excellence in Regional Atmospheric Environment, Institute of Urban Environment, Chinese Academy of Sciences, Xiamen 361021, China., Ma Q; State Key Joint Laboratory of Environment Simulation and Pollution Control, Research Center for Eco-Environmental Sciences, Chinese Academy of Sciences, Beijing 100085, China.; University of Chinese Academy of Sciences, Beijing 100049, China.; Center for Excellence in Regional Atmospheric Environment, Institute of Urban Environment, Chinese Academy of Sciences, Xiamen 361021, China., Liu C; Panzhihua University, Sichuan 617000, China., Li H; State Key Joint Laboratory of Environment Simulation and Pollution Control, Research Center for Eco-Environmental Sciences, Chinese Academy of Sciences, Beijing 100085, China., Chu B; State Key Joint Laboratory of Environment Simulation and Pollution Control, Research Center for Eco-Environmental Sciences, Chinese Academy of Sciences, Beijing 100085, China.; University of Chinese Academy of Sciences, Beijing 100049, China.; Center for Excellence in Regional Atmospheric Environment, Institute of Urban Environment, Chinese Academy of Sciences, Xiamen 361021, China., He H; State Key Joint Laboratory of Environment Simulation and Pollution Control, Research Center for Eco-Environmental Sciences, Chinese Academy of Sciences, Beijing 100085, China.; University of Chinese Academy of Sciences, Beijing 100049, China.; Center for Excellence in Regional Atmospheric Environment, Institute of Urban Environment, Chinese Academy of Sciences, Xiamen 361021, China.
Jazyk:	angličtina
Zdroj:	Environmental science & technology [Environ Sci Technol] 2023 Nov 21; Vol. 57 (46), pp. 17718-17726. Date of Electronic Publication: 2023 Mar 15.
DOI:	10.1021/acs.est.2c09674
Abstrakt:	The heterogeneous oxidation of SO 2 by NO 2 has been extensively proposed as an important pathway of sulfate production during haze events in China. However, the kinetics and mechanism of oxidation of SO 2 by NO 2 on the surface of complex particles remain poorly understood. Here, we systematically explore the mechanism and kinetics of the reaction between SO 2 and NO 2 on diesel black carbon (DBC) under light irradiation. The experimental results prove that DBC photochemistry can not only significantly promote the heterogeneous reduction of NO 2 to produce HONO via transferring photoinduced electrons but also indirectly promote OH radical formation. These reduction products of NO 2 as well as NO 2 itself greatly promote the heterogeneous oxidation of SO 2 on DBC. NO 2 oxidation, HONO oxidation, and the surface photo-oxidation process are proven to be three major surface oxidation pathways of SO 2 . The kinetics results indicate that the surface photooxidation pathway accounts for the majority of the total SO 2 uptake (∼63%), followed by the HONO oxidation pathway (∼27%) and direct oxidation by NO 2 (∼10%). This work highlights the significant synergistic roles of DBC, NO 2 , and light irradiation in enhancing the atmospheric oxidation capacity and promoting the heterogeneous formation of sulfate.
Databáze:	MEDLINE
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