J. Korean Ceram. Soc. > Volume 39(6); 2002 > Article
 Journal of the Korean Ceramic Society 2002;39(6): 550. doi: https://doi.org/10.4191/kcers.2002.39.6.550
 침전제적하법에 의한 나노 TiO2코팅 석탄회 복합체 제조 신대용, 한상목1 강원대학교 석재복합 신소재제품 연구센터1강원대학교 신소재공학과 Synthesis of Nano TiO2 Coated on Fly Ash Composites by the Precipitation Dropping Method ABSTRACT TiO$_2$ particles coated on fly ash composites for use in photocatalyst were synthesized by the precipitation dropping method and heated at $700^{circ}C$ for 2 h. The pH of reaction solution, the addition rate of NH$_4$HCO$_3$, the stirring speed, the reaction temperature and the concentration of TiC1$_4$ had a pronounced effect on the nature of precipitated TiO$_2$ particles on the surface off fly ash and the crystal structure of precipitated TiO$_2$ particles. At an addition rate of NH$_4$HCO$_3$; 1.0 ml/min, the pH of the reaction solution; 6, the stirring speed; 1,000 rpm and the reaction temperature; 8$0^{circ}C$, about 10 nm of TiO$_2$ particle size and homogeneous precipitated layer on the surface of a fly ash was achieved. On the contrary, at an addition rate of NH$_4$HCO$_3$; 0.3,0.5 ml/min, the pH of the reaction solution; 2 and 11, the stirring speed; 300~500 rpm and the reaction temperature; lower than 5$0^{circ}C$:, Inhomogeneous precipitated layer was developed on a fly ash. TiO$_2$ particles with anatase phase was formed as-dried precipitation at the low concentration of Tic14, the high addition rate of NH$_4$HCO$_3$ and the high reaction temperature, the crystalline fraction of anatase increased with raising heat-treatment temperature and rutile phase began to formation at 80$0^{circ}C$. The crystal size of TiO$_2$ particles increased with raising the heat-treatment temperature, the crystal size was showed about 21 m at $700^{circ}C$. Anatase type of TiO$_2$ coated on the fly ash heated at $700^{circ}C$ for 2 h showed 1.25 g/cm$^3$of particle density, 82.8% of strength and 69.5 Lab of whiteness and can be used as a photocatalyst. Key words: Fiy ash, $TiO_2$, Photocatalyst, Anatase, Rutile, Precipitant dropping method
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