Journal of the Korean Society of Mineral and Energy Resources Engineers ISSN:2288-0291(Print) 2288-2790(Online) 한국자원공학회지

Degussa P25 titania was coated on porous ceramic pellet via dip-coating method. The resulting materials were characterized by XRD, SEM and turbidity meter. In particular, changes in crystal structure and coating adhesion of TiO2 on the surface of pellets were checked according to the heat treatment temperatures. The results showed that the transformation of anatase to rutile was immeasurably slow for heat treatment below 800℃ but, was rapid at temperatures exceeding 800℃. At 1000℃, the crystal structure of TiO2 coated on pellet was transformed to rutile, completely. This could be compared with TiO2 powder which was completely transformed to rutile at 800℃, because alumina and silica composition of support inhibited the transformation. Surface strength was increased with increasing heat treatment temperature. But over 700℃ the changes were not measured. The pellets coated with TiO2 were tested by photocatalytic degradation of phenol. The photodegradation rate was increased with increasing heat treatment temperature. But over 800℃, the rate decreased. It is resulted from the increasing of rutile phase and reduction of specific surface area.