| 초록 |
Sub-micro and micrometer sizes photocatalytic TiO2 particles were synthesized via a sol-gel method and subsequent thermal calcination. The particle size can be adjusted by controlling the hydrolysis conditions such as types/amounts/dropping rates of hydrolysis agents. The applicational potential of the photocatalytic sub-micro TiO2 particles (100~ 200 nm) for the water depollution were examined under UV light irradiation. The 550 oC-annealed TiO2 particles (~200 nm) with the optimum anatase to rutile ratio was the most active one among the synthesized samples towards methylene blue, methyl orange, and phenol depollution. Compared to a commercial TiO2 nanoparticles (P25, Evonik), not only it exhibited the comparable activity towards MB degradation, but also its’ separation can be much easily done by a simple sedimentation due to its larger sizes (~ 200 nm). |
