Abstract
[ $TiO_2$ ] nanoparticles were prepared from the precipitation in $TiCl_4$ and the sol-gel profess in $Ti(OC_3H_7)_4$ as starting materials with various synthetic conditions. The samples were characterized by XRD, SEM, and TEM testing techniques. The photocatalytic degradation of congo red has been investigated in $TiO_2/UV$ process to evaluate photocatalytic activities for the samples. $TiO_2$ nanoparticles calcined at $400^{\circ}C$ had the best photocatalytic activity with the rate constant of the degradation of congo red as $0.0319\;min^{-1}$. The rate constant of $TiO_2$ photocatalysts was increased with the calcination temperature under $400^{\circ}C$ and decreased with the calcination temperature upper $400^{\circ}C$. In the case of $TiO_2$ photocatalysts, the photocatalytic activity wasn't greatly affected by the frequencies of usage. In the similar synthesis condition, the degradation efficiency of the $TiO_2$ particle prepared by $TiCl_4$ was increased to 8.8%, when the rate was compared with the sample prepared by $Ti(OC_3H_7)_4$. The photocatalytic activities of $TiO_2$ photocatalysts synthesized by $Ti(OC_3H_7)_4$ with various conditions were also discussed.
[ $400^{\circ}C$ ]에서 소성한 $TiO_2$ 나노입자의 congo red 분해속도상수가 $0.0319\;min^{-1}$로써 최적의 광촉매 활성을 나타내었다. $TiO_2$ 광촉매의 congo red 분해 속도상수는 $400^{\circ}C$ 이하의 소성온도에서는 온도에 비례하여 증가하였고 $400^{\circ}C$ 이상의 소성온도에서는 온도에 비례하여 감소하였다. $TiO_2$ 광촉매는 사용빈도가 촉매 활성에 큰 영향을 주지 않았다. 유사한 반응조건에서 $TiO_2$의 광촉매 활성은 $TiCl_4$로 합성한 촉매가 $Ti(OC_3H_7)_4$로 합성한 촉매와 비교 했을 때 8.8% 증가하는 것으로 나타났다. 또한, 다양한 조건에서 $Ti(OC_3H_7)_4$로 합성한 $TiO_2$ 광촉매의 활성을 논의하였다.
