Synergistic effect among Cl-2, SO2 and NO2 in their heterogeneous reactions on gamma-alumina
Synergistic effect among Cl-2, SO2 and NO2 in their heterogeneous reactions on gamma-alumina
复制标题
Cl-2、SO2和NO2在γ-氧化铝上非均相反应中的协同效应
DOI：
10.1016/j.atmosenv.2017.06.041
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发表时间：
2017
影响因子：
5
通讯作者：
ou
中科院分区：
文献类型：
--
作者：
Huang Zhenling;Zhang Zhaohui;Kong Weiheng;Feng Shuo;Qiu Ye;Tang Siqun;Xia Chuanqin;Ma Lingling;Luo Min;Xu Di;ou
近年来，中国的严重雾霾一直是全球关注的问题。以往关于灰霾形成机理的研究主要集中在SO2和NO2在矿物气溶胶上的非均相反应。然而，人们对分子氯（Cl 2）在这些反应中的作用知之甚少。采用石英基流动反应器研究了不同条件下γ-Al_2O_3颗粒对Cl_2、SO_2和NO_2的非均相吸收。研究发现，γ-Al 2 O3种子气溶胶的存在显著促进了二次氯离子、硫酸盐和硝酸盐气溶胶的形成，且潮湿条件下Cl 2、NO2和SO2在γ-Al 2 O3表面反应时具有协同效应。结果还表明，Cl 2能促进γ-Al 2 O3表面二次硫酸盐和硝酸盐气溶胶的形成。此外，与NO2和SO2相比，Cl 2更容易与γ-Al 2 O3表面反应并形成二次Cl−气溶胶，这表明Cl 2在大气化学中非常重要，它具有改变表面性质的潜力（例如，矿物气溶胶的化学成分和分数），增加对流层中二次无机气溶胶的产生，从而对气候和人类健康造成不利影响。
Severe haze in China has been a global concern in recent years. Most studies about the mechanism of haze formation mare only focused on the heterogeneous reactions of SO2and NO2on mineral aerosols. However, little is known about the role of molecular chlorine (Cl2) in those reactions. Here, we investigated the heterogeneous uptake of Cl2, SO2and NO2on γ-Al2O3particles under different conditions using a quartz-based flow reactor. We found that the existence of γ-Al2O3seed aerosols significantly promotes the formation of secondary chloride, sulfate and nitrate aerosols, and Cl2, NO2and SO2have synergistic effects when they react on γ-Al2O3surface under humid condition. The results also shows that Cl2can promote the formation of secondary sulfate and nitrate aerosols on γ-Al2O3surface. Moreover, Cl2is much easier to react with the surface of γ-Al2O3and form secondary Cl−aerosol when comparing with NO2and SO2, suggesting that Cl2is of great importance in atmospheric chemistry, it has the potential to alter the surface properties (e.g., chemical composition and fraction) of mineral aerosol, enhance the production of secondary inorganic aerosols in the troposphere, and thus cause adverse effects on the climate and human health.