Water Promotes the Oxidation of SO2 by O2 over Carbonaceous Aerosols
Water Promotes the Oxidation of SO2 by O2 over Carbonaceous Aerosols
复制标题
水促进碳气溶胶上的 O2 对 SO2 的氧化
DOI：
10.1021/acs.est.0c00021
复制
发表时间：
2020-06-16
影响因子：
11.4
通讯作者：
He, Hong
中科院分区：
文献类型：
--
作者：
He, Guangzhi;He, Hong
Severe haze episodes typically occur with concurrent high relative humidity. Here, the vital role of water in promoting the oxidation of SO2 by O-2 on carbonaceous soot surfaces was identified at the atomic level by first-principles calculations. Water molecules can dissociate into surface hydroxyl groups through a self-catalyzed process under ambient conditions. The surface hydroxyl groups, acting as facilitators, can significantly accelerate the conversion of SO2 to SO3 (precursor of particulate sulfate) over soot aerosols by reducing the reaction barriers. Specifically, the hydroxyl groups activate the reactants and stabilize the transition states and products through hydrogen-bonding interactions, making the reactions both thermodynamically and kinetically more favorable at room temperature. The findings indicate that atmospheric humidity plays an important role in enhancing the atmospheric oxidation capacity, thus exacerbating SO2 oxidation and severe haze development. Also, this study unravels a mechanism of surface hydroxyl-assisted O-2 and H2O dissociation over metal-free carbocatalysts under normal conditions.
