In situ DRIFTS study of hygroscopic behavior of mineral aerosol  被引量:5

In situ DRIFTS study of hygroscopic behavior of mineral aerosol

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作  者:Qingxin Ma,Hong He,Yongchun Liu State Key Laboratory of Environmental Chemistry and Ecotoxicology,Research Center for Eco-Environmental Sciences,Chinese Academy of Sciences,Beijing 100085,China. 

出  处:《Journal of Environmental Sciences》2010年第4期555-560,共6页环境科学学报(英文版)

基  金:supported by the National Natural Science Foundation of China (No.20877084,20937004);the Chinese Academy of Sciences (No.KZCX2-YW-Q02-03)

摘  要:In situ diffusion reflectance infrared Fourier transform spectroscopy was used to study the water adsorption on mineral oxides (SiO2, a-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 DRIPTS were also discussed.In situ diffusion reflectance infrared Fourier transform spectroscopy was used to study the water adsorption on mineral oxides (SiO2, a-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 DRIPTS were also discussed.

关 键 词:DRIFTS mineral oxides water adsorption HYGROSCOPICITY 

分 类 号:X513[环境科学与工程—环境工程]

 

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