In situ DRIFTS study of hygroscopic behavior of mineral aerosol
In situ DRIFTS study of hygroscopic behavior of mineral aerosol
复制标题
矿物气溶胶吸湿行为的原位 DRIFTS 研究
DOI：
10.1016/s1001-0742(09)60145-5
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发表时间：
2010-01-01
影响因子：
6.9
通讯作者：
Liu, Yongchun
中科院分区：
文献类型：
--
作者：
Ma, Qingxin;He, Hong;Liu, Yongchun
用原位扩散反射红外傅里叶变换光谱研究了水在矿物氧化物(SiO_2、α-Al_2O_3、MgO、Fe_2O_3、TiO_2)上的吸附。结果表明，所有的吸附等温线均符合Brunauer-Emmett-Teller(BET)-III型吸附等温式，计算得到的单层吸附等温线出现在相对湿度为24%~30%的区域。结果表明，在环境相对湿度(20%~90%)条件下，氧化物表面约有1~5层水吸附。测得氯化钠的潮解相对湿度为(74+/-1)%，说明漂移法是研究矿物粉尘吸湿行为的一种有效方法。此外，还讨论了漂移的界限。
In situ diffusion reflectance infrared Fourier transform spectroscopy was used to study the water adsorption on mineral oxides (SiO2, alpha-Al2O3, MgO, Fe2O3, TiO2). The results showed that all the water adsorption isotherms were well fitted with the Brunauer-Emmett-Teller (BET)-III type equation, with the calculated monolayers occurring at 24%-30% relative humidity. It showed that about 1-5 layers of water adsorbed on oxides surfaces in ambient relative humidity (20%-90%). The measured deliquescence relative humidity of NaCl was (74 +/- 1)%, which demonstrated that DRIFTS is a useful method for the study the hygroscopic behavior of mineral dust. In addition, the limits of DRIFTS were also discussed.