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Effects of NO2 and C3H6 on the heterogeneous oxidation of SO2 on TiO2 in the presence or absence of UV-Vis irradiation
Chu, Biwu; Wang, Yali; Yang, Weiwei; Ma, Jinzhu; Ma, Qingxin; Zhang, Peng; Liu, Yongchun; He, Hong
2019-12-09
Source PublicationATMOSPHERIC CHEMISTRY AND PHYSICS
ISSN1680-7316
Volume19Issue:23Pages:14777-14790
AbstractThe heterogeneous reactions of SO2 in the presence of NO2 and C3H6 on TiO2 were investigated with the aid of in situ diffuse reflectance infrared fourier transform spectroscopy (DRIFTS) under dark conditions or with UV- Vis irradiation. Sulfate formation with or without the coexistence of NO2 and/or C3H6 was analyzed with ion chromatography (IC). Under dark conditions, SO2 reacting alone resulted in sulfite formation on TiO2, while the presence of parts per billion (ppb) levels of NO2 promoted the oxidation of SO2 to sulfate. The presence of C3H6 had little effect on sulfate formation in the heterogeneous reaction of SO2 but suppressed sulfate formation in the heterogeneous reaction of SO2 and NO2. UV-Vis irradiation could significantly enhance the heterogeneous oxidation of SO2 on TiO2, leading to copious generation of sulfate, while the coexistence of NO2 and/or C3H6 significantly suppressed sulfate formation in experiments with UV-Vis lights. Step-by-step exposure experiments indicated that C3H6 mainly competes for reactive oxygen species (ROS), while NO2 competes with SO2 for both surface active sites and ROS. Meanwhile, the coexistence of NO2 with C3H6 further resulted in less sulfate formation compared to introducing either one of them separately to the SO2-TiO2 reaction system. The results of this study highlighted the complex heterogeneous reaction processes that take place due to the ubiquitous interactions between organic and inorganic species and the need to consider the influence of coexisting volatile organic compounds (VOCs) and other inorganic gases in the heterogeneous oxidation kinetics of SO2.
Department大气污染控制中心
Document Type期刊论文
Identifierhttp://ir.rcees.ac.cn/handle/311016/43150
Collection大气污染控制中心
Affiliation1.Chinese Acad Sci, State Key Joint Lab Environm Simulat & Pollut Con, Res Ctr Ecoenvironm Sci, Beijing 100085, Peoples R China
2.Chinese Acad Sci, Inst Urban Environm, Ctr Excellence Reg Atmospher Environm, Xiamen 361021, Fujian, Peoples R China
3.Univ Chinese Acad Sci, Beijing 100049, Peoples R China
Recommended Citation
GB/T 7714
Chu, Biwu,Wang, Yali,Yang, Weiwei,et al. Effects of NO2 and C3H6 on the heterogeneous oxidation of SO2 on TiO2 in the presence or absence of UV-Vis irradiation[J]. ATMOSPHERIC CHEMISTRY AND PHYSICS,2019,19(23):14777-14790.
APA Chu, Biwu.,Wang, Yali.,Yang, Weiwei.,Ma, Jinzhu.,Ma, Qingxin.,...&He, Hong.(2019).Effects of NO2 and C3H6 on the heterogeneous oxidation of SO2 on TiO2 in the presence or absence of UV-Vis irradiation.ATMOSPHERIC CHEMISTRY AND PHYSICS,19(23),14777-14790.
MLA Chu, Biwu,et al."Effects of NO2 and C3H6 on the heterogeneous oxidation of SO2 on TiO2 in the presence or absence of UV-Vis irradiation".ATMOSPHERIC CHEMISTRY AND PHYSICS 19.23(2019):14777-14790.
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