TiO2-based photocatalysis technology was developed and applied to photodegradation of organic contaminants by utilizing solar energy effectively. Pure and doped or co-doped TiO2 catalysts with various amounts of lanthanum and carbon were obtained by a modified sol-gel process, in which tetrabutyl titanate was used as precursor and lanthanum nitrate, tetrabutylammonium hydroxide as ion donors. The as-prepared photocatalysts were found to be of anatase phase, higher specific area, and visible response by means of XRD, BET and UV-vis spectra analysis. The co-doped TiO2 catalysts showed higher photocatalytic activity in degradation of rhodamine B, methyl orange and 4-chlorphenol under Xe lamp, sunlight or daylight irradiation than that of pure and single doped ones. Photodegradation experiments showed that the co-doped catalyst with 0.5% (molar ratio) lanthanum calcinated at 500 °C was of the highest catalytic efficiency under visible irradiation. The higher visible light photocatalytic activity of codoped TiO2 was attributed to the doped carbon that lowered the band gap and the doped lanthanum which maintained the charge balance at the same time.
|Number of pages||5|
|Journal||Huagong Xuebao/Journal of Chemical Industry and Engineering (China)|
|Publication status||Published - Jul 2006|