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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.