APPLICATION OF TiO_2 PHOTOCATALYST DEPOSITED ON SiC FOR DEGRADATION OF ORGANIC COMPOUNDS DILUTED IN WATER

摘要

TiO_2-SiC photocatalyst was prepared by a calcination of TiC-SiC nano particle precursor synthesized by the carbothermic reduction method. On TiO_2-SiC photocatalyst the formation of the mixture of anatase and rutile phases of TiO_2 was observed after the calcination at 873 K, while no crystallized TiO_2 phase was formed on TiO_2-SiO_2 photocatalyst prepared by a conventional sol-gel method and calcined at 873 K. TiO_2-SiC photocatalyst decomposed 2-propanol into acetone, CO_2, and H_2O when UV-light was irradiated and finally acetone was degradated into CO_2, and H_2O. TiO_2-SiC exhibited the higher photocatalytic reactivity than TiO_2-SiO_2 photocatalyst. Amount of water adsorption on TiO_2-SiC photocatalyst was much smaller than TiO_2-SiO_2 photocatalyst. Well-crystallized TiO_2 deposited on SiC and hydrophobic surface of SiC are important factors for enhancement of photocatalytic degradation of organic compounds diluted in water.