5 years ago

Effects of Calcination Temperature on Morphology, Microstructure, and Photocatalytic Performance of TiO2 Mesocrystals

Effects of Calcination Temperature on Morphology, Microstructure, and Photocatalytic Performance of TiO2 Mesocrystals
Jun Hyung Lim, Chae Hee Park, Jinho Joo, Tae Yang Seo, Geun Chul Park
We synthesized TiO2 mesocrystals using a hydrothermal method and investigated the effect of calcination temperature (100–800 °C) on their morphology, crystallinity, and photocatalytic activity. While no appreciable changes in the shape, dimension, and crystal structure of the TiO2 nanoparticles (NPs) were observed as the calcination temperature increased to 300 °C, the crystallinity improved with increasing temperature. The mesocrystal form of the NPs began to disappear at 400 °C, and the specific surface area significantly decreased with increasing temperature owing to the reduced boundaries between the subunits and surface roughness of the NPs. The photocatalytic activity of the TiO2 NPs improved when the temperature increased to 300 °C because of the enhanced crystallinity and elimination of byproducts; on the other hand, it degraded above 400 °C due to the decreased surface area. These results suggest that controlling the calcination temperature is an effective way to tailor the morphology, crystallinity, and photocatalytic activity of TiO2 NPs.

Publisher URL: http://dx.doi.org/10.1021/acs.iecr.7b01920

DOI: 10.1021/acs.iecr.7b01920

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