TiO2-SiO2复合半导体气凝胶制备及光催化活性研究

PREPARATION AND PHOTOCATALYTIC ACTIVITY OF TiO2—SiO2 BINARY SEMICONDUCTOR AEROGELS

    摘要
  • 摘要: TiO2 -SiO2 复合半导体气凝胶是一种新型纳米光催化氧化剂。本文以正硅酸乙酯、钛酸丁酯为原料 ,用溶胶—凝胶法经超临界干燥制备出了TiO2-SiO2 复合半导体气凝胶。研究了TiO2 :SiO2 不同配比对溶胶—凝胶过程的影响 ;用BET、XRD、SEM、TEM等测试方法对其结构进行了表征 ;以苯酚为探针考察了TiO2-SiO2 复合半导体气凝胶的光催化氧化活性 ,并与普通锐钛矿型钛白粉光催化剂进行了对比。结果表明 :所制备的TiO2-SiO2 复合半导体气凝胶具有大比表面积 (523.8 m2g-1) ,纳米多孔结构 (骨架颗粒约为 30 - 50纳米 ,孔洞尺寸为几十纳米) ;其光催化氧化活性大大高于普通锐钛矿型二氧化钛。

     

    Abstract: Nano-porous photocatalyst TiO2-SiO2 binary semiconductor aerogels were prepared by the sol-gel method with Ti(OC4H9)4 and Si(OC2H 5)4 as the precursors and by supercritical drying of ethanol. The influence of ethanol, water and the mole ratio of TiO2 and SiO2 on the gelation process was investigated. The microstructure of the TiO2-SiO2 binary semiconductor aerogel was also tested by using BET、XRD、SEM . The photocatalytic activity of TiO2-SiO2 binary semiconductor aerogels was characterized by measuring degradation of phoenol in aqueous suspension. The results showed that the TiO2-SiO2 binary aerogels had high surface area(523.8m 2g -1 )and the diameter of their skeletal particles is 30-50 nm. Compared with titania powder(in the form of anatase and particle diameter 3-5μm), it was proved that the TiO2-SiO2 binary semiconductor aerogel with TiO2:SiO2 mole ratio 1:1 had the highest efficiency in the photocatalytic oxidation of phenol under the same experimental conditions.

     

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