State Key Joint Laboratory of Environment Simulation and Pollution Control, School of Environment, Tsinghua University , Beijing 100084, China.
State Key Joint Laboratory of Environment Simulation and Pollution Control, Research Center for Eco-Environmental Sciences, Chinese Academy of Sciences , Beijing 100085, China.
Environ Sci Technol. 2017 Sep 5;51(17):9596-9604. doi: 10.1021/acs.est.7b00194. Epub 2017 Aug 10.
Heterogeneous reactions between organic and inorganic gases with aerosols are important for the study of smog occurrence and development. In this study, heterogeneous reactions between toluene and NO with three atmospheric mineral particles in the presence or absence of UV light were investigated. The three mineral particles were SiO, α-FeO, and BS (butlerite and szmolnokite). In a dark environment, benzaldehyde was produced on α-FeO. For BS, nitrotoluene and benzaldehyde were obtained. No aromatic products were produced in the absence of NO in the system. In the presence of UV irradiation, benzaldehyde was detected on the SiO surface. Identical products were produced in the presence and absence of UV light over α-FeO and BS. UV light promoted nitrite to nitrate on mineral particles surface. On the basisi of the X-ray photoelectron spectroscopy (XPS) results, a portion of BS was reduced from Fe to Fe with the adsorption of toluene or the reaction with toluene and NO. Sulfate may play a key role in the generation of nitrotoluene on BS particles. From this research, the heterogeneous reactions between organic and inorganic gases with aerosols that occur during smog events will be better understood.
有机气体和无机气体与气溶胶之间的非均相反应对于研究烟雾的发生和发展非常重要。在这项研究中，研究了在存在或不存在紫外光的情况下，三种大气矿物质颗粒与甲苯和 NO 之间的非均相反应。这三种矿物质颗粒分别为 SiO、α-FeO 和 BS（butlerite 和 szmolnokite）。在黑暗环境中，α-FeO 上生成了苯甲醛。对于 BS，得到了硝基甲苯和苯甲醛。在没有 NO 的情况下，体系中没有产生芳香族产物。在紫外光照射下，SiO 表面检测到了苯甲醛。在存在和不存在紫外光的情况下，α-FeO 和 BS 上都生成了相同的产物。紫外光促进了矿物质颗粒表面上的亚硝酸盐向硝酸盐的转化。根据 X 射线光电子能谱（XPS）结果，一部分 BS 被还原为 Fe，这是由于甲苯的吸附或甲苯与 NO 的反应所致。硫酸盐可能在 BS 颗粒上生成硝基甲苯的过程中发挥了关键作用。通过这项研究，将更好地理解烟雾事件期间发生的有机和无机气体与气溶胶之间的非均相反应。
