Abstract
ZnTiO 3 was supported on quartz microspheres to reduce ZnTiO 3 particle aggregation and to enhance the photocatalytic activity of ZnTiO 3 . The distribution of ilmenite phase ZnTiO 3 on quartz microspheres was found to reduce the ZnTiO 3 crystallite size from 40.4 nm to 19.9 nm. The commonly large ZnTiO 3 particles in pure ZnTiO 3 can hardly exist in χZnTiO 3 /SiO 2 composites. The bandgap energy of ZnTiO 3 is enlarged after support on quartz microspheres. The bandgap energies of 20ZnTiO 3 /SiO 2 , 50ZnTiO 3 /SiO 2 , 80ZnTiO 3 /SiO 2 and pure ZnTiO 3 were determined to be 3.42, 3.38, 3.08 and 2.93 eV, respectively. The pore volume and the BET surface area of χZnTiO 3 /SiO 2 composites were several times larger than that for both quartz microsphere and ZnTiO 3 . The hole-electron recombination efficiency is reduced after supporting the ZnTiO 3 on quartz microspheres. The photocatalytic activity of χZnTiO 3 /SiO 2 composites is in the sequence 50ZnTiO 3 /SiO 2 > 80ZnTiO 3 /SiO 2 > 20ZnTiO 3 /SiO 2 > ZnTiO 3 . The RBR X-3B degradation rate constants for ZnTiO 3 , 20ZnTiO 3 /SiO 2 and 50ZnTiO 3 /SiO 2 were determined to be 0.01016, 0.02271 and 0.02653 min −1 , respectively. The RBR X-3B degradation efficiency in the presence of 50ZnTiO 3 /SiO 2 reaches 91.7% after 80 min of reaction.
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