Titania-silica aerogels are prepared by sol-gel and carbon dioxide supercritical drying. The morphologies and microstructures of aerogels are characterized by FE-SEM, BET and BJH adsorptions. The crystalline and the m...
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Titania-silica aerogels are prepared by sol-gel and carbon dioxide supercritical drying. The morphologies and microstructures of aerogels are characterized by FE-SEM, BET and BJH adsorptions. The crystalline and the mechanical structures of aerogels are also studied. Since titania- silica aerogels with very large specific surface area are effective for VOC adsorption and anatase titania reveals good photocatalytic activities under UV light exposure, the as-prepared aerogels are used for toluene degradation in a photocatalytic fluidized bed reactor. With the inlet toluene concentration of 600 ppm- 1000 ppm and gas flow rate of 5 L/min- 15 L/min, the toluene vapor is continuously degraded with the removal efficiency greater than about 40%. The toluene removal efficiency decreases with the increases of the inlet toluene concentration and the gas flow rate.
Atmospheric aerosols play important roles in climate and atmospheric chemistry: They scatter sunlight, provide condensation nuclei for cloud droplets, and participate in heterogeneous chemical reactions. To enable bet...
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Atmospheric aerosols play important roles in climate and atmospheric chemistry: They scatter sunlight, provide condensation nuclei for cloud droplets, and participate in heterogeneous chemical reactions. To enable better understanding of the vertical physical, chemical and optical feathers of the aerosols in East Asia, using some atmospheric and aerosol measument instruments on board a kind of tethered-balloon system, a series of measurements were operated in some typical areas of East Asia, incluing Dunhuang, which is located in the source origin district of Asian dust and Beijing, which is the representative of large inland city during the years of 2007-2011. Mineral composition and microbial components carried by the airborne particles were both analyzed. Moreover, the simultaneous observations over the districts of China, Japan and Korea supported by an international cooperative project are highly expected.
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