Wang Ruixue, Yang Ning, Li Jianlong, Xu Li, Tsona Narcisse T, Du Lin, Wang Wenxing
Environment Research Institute, Shandong University, Qingdao 266237, China.
Environment Research Institute, Shandong University, Qingdao 266237, China.
J Environ Sci (China). 2022 Apr;114:149-159. doi: 10.1016/j.jes.2021.08.017. Epub 2022 Jan 14.
Despite the heterogeneous reaction of sulfur dioxide (SO) on mineral dust particles significantly affects the atmospheric environment, the effect of acidic gases on the formation of sulfite and sulfate from this reaction is not particularly clear. In this work, using the in-situ diffuse reflectance infrared Fourier transform spectroscopy (DRIFTS) technique, we employed a mineral dust particle model (CaCO) combined with NO and acetic acid to investigate their effects on the heterogeneous reaction of SO on CaCO particles. It was found that water vapor can promote the formation of sulfite and simulated radiation can facilitate the oxidation of sulfite to sulfate. The addition of NO or acetic acid to the reaction system altered the production of sulfate and sulfite accordingly. There was a synergistic effect between NO and SO that promoted the oxidation of sulfite to sulfate, and a competitive effect between acetic acid and SO that inhibited the formation of sulfite. Moreover, light and water vapor can also affect the heterogeneous reaction of SO with the coexistence of multiple gases. These findings improve our understanding of the effects of organic and inorganic gases and environmental factors on the formation of sulfite and sulfate in heterogeneous reactions.
尽管二氧化硫（SO）在矿物尘埃颗粒上的非均相反应对大气环境有显著影响，但酸性气体对该反应中亚硫酸盐和硫酸盐形成的影响尚不完全清楚。在这项工作中，我们使用原位漫反射红外傅里叶变换光谱（DRIFTS）技术，采用矿物尘埃颗粒模型（CaCO）并结合NO和乙酸，研究它们对SO在CaCO颗粒上非均相反应的影响。研究发现，水蒸气可促进亚硫酸盐的形成，模拟辐射可促进亚硫酸盐氧化为硫酸盐。向反应体系中添加NO或乙酸会相应改变硫酸盐和亚硫酸盐的生成量。NO和SO之间存在协同效应，促进了亚硫酸盐氧化为硫酸盐，而乙酸和SO之间存在竞争效应，抑制了亚硫酸盐的形成。此外，光和水蒸气在多种气体共存时也会影响SO的非均相反应。这些发现增进了我们对有机和无机气体以及环境因素对非均相反应中亚硫酸盐和硫酸盐形成影响的理解。
