Knudsen cell and smog chamber study of the heterogeneous uptake of sulfur dioxide on Chinese mineral dust.
Knudsen cell and smog chamber study of the heterogeneous uptake of sulfur dioxide on Chinese mineral dust.
复制标题
DOI：
10.1016/j.jes.2014.04.005
复制
发表时间：
2014-12
影响因子：
6.9
通讯作者：
Li Zhou;Weigang Wang;Yanbo Gai;Maofa Ge
中科院分区：
文献类型：
--
作者：
Li Zhou;Weigang Wang;Yanbo Gai;Maofa Ge
采用Knudsen吸收池和烟雾箱系统研究了中国两种矿物尘（内蒙古荒漠尘和新疆灰钙土）对SO2的非均相吸收过程。利用Knudsen电池反应器研究了253 ~ 313 K范围内两种矿尘的初始吸收系数随温度的升高而降低，而新疆灰钙土的稳态吸收系数则随温度的升高而升高，并首次得到了这两种矿尘的稳态吸收系数随温度的变化函数。在室温烟雾箱实验中，随着SO2初始浓度从1.72 × 1012 mol/cm 3增加到6.15 × 1012 mol/cm 3，SO2的稳态吸收系数明显降低。湿空气对内蒙古沙漠沙尘对SO2的稳态吸收系数有影响。对矿物粉尘样品的吸收过程的理解和环境影响的后果进行了讨论。
The heterogeneous uptake processes of sulfur dioxide on two types of Chinese mineral dust (Inner Mongolia desert dust and Xinjiang sierozem) were investigated using both Knudsen cell and smog chamber system. The temperature dependence of the uptake coefficients was studied over a range from 253 to 313 K using the Knudsen cell reactor, the initial uptake coefficients decreased with the increasing of temperature for these two mineral dust samples, whereas the steady state uptake coefficients of the Xinjiang sierozem increased with the temperature increasing, and these temperature dependence functions were obtained for the first time. In the smog chamber experiments at room temperature, the steady state uptake coefficients of SO2decreased evidently with the increasing of sulfur dioxide initial concentration from 1.72 × 1012to 6.15 × 1012mol/cm3. Humid air had effect on the steady state uptake coefficients of SO2onto Inner Mongolia desert dust. Consequences about the understanding of the uptake processes onto mineral dust samples and the environmental implication were also discussed.