Abstract: The La3+-doped TiO2 photocatalysts were prepared by conventional method and microwave, respectively, and they were used for formaldehyde degradation. Scanning electron microscopy, transmission electron microscopy, X-ray diffraction, and energy dispersive X-ray analysis were applied to characterize the photocatalysts. The results showed that the TiO2 prepared by microwave had a crystalline structure of anatase, and its particles were well-dispersed and smaller than that prepared by conventional method. A 1.5%La3+-doped TiO2 was immobilized onto porous nickel mesh by coating and the prepared catalyst showed high photocatalytic activity for formaldehyde degradation. The conversion rate of formaldehyde was 93% after reaction for 90 min. The deactivation of TiO2 photocatalyst was observed but it could be easily recovered by simple cleanness.

Key words: microwave, lanthanum, doping, titania, porous nickel, formaldehyde, photocatalytic degradation