본 연구에서는 Titanium(IV) sulfate(Ti(SO4)2)와 암모니아수로부터 수열합성법을 이용하여 비교적 낮은 합성온도(80~100 ℃)와 상압에서 소성과정을 거치지 않고 TiO2 분말을 제조하였고, TiO2 제조 시 반응온도, 반응물의 초기농도, 혼합용액의 pH와 같은 반응조건에 따른 TiO2 입자의 결정구조와 입자분포, 형상 등과 같은 물리적 특성을 고찰하였다. 제조한 시료는 UV 조사 하에 Brilliant Blue FCF(BB-FCF)의 광분해 실험을 실시하여 광분해 성능과 DRS 분석을 통해 광촉매 활성을 비교하였다. 제조한 시료의 물성은 XRD, SEM, PL, 입도분포 측정을 통하여 확인하였다. Titanium(IV) sulfate(Ti(SO4)2)의 초기농도가 증가할수록 TiO2의 평균 입자크기와 결정화도는 증가하였고 광촉매 활성은 감소하였다. 혼합용액의 pH가 높을수록 평균 입자크기는 감소하였고 광촉매 활성은 증가하였다. 반응온도가 높을수록 결정화도와 광촉매 활성은 증가하였다. 이상의 결과들로부터 Ti(SO4)2와 암모니아수를 이용한 비교적 낮은 합성온도와 상압에서의 수열합성법으로도 순수한 anatase 결정구조의 TiO2가 제조됨을 확인할 수 있었다.

TiO2 powders were prepared from titanium (IV) sulfate (Ti(SO4)2) solution using ammonia solution at low reaction temperature (80~100 ℃) and atmospheric pressure by hydrothermal precipitation method without calcination. The effect of reaction conditions, such as reaction temperature, initial concentration of titanium (IV) sulfate (Ti(SO4)2) solution, pH of mixture solution and the physical properties of the prepared TiO2, such as crystallite structure, crystallite_x000D_ size were investigated. The photocatalytic activity of prepared TiO2 was tested by the photolysis of brilliant blue FCF (BB-FCF) under the UV and the analysis of UV-VIS diffuse reflectance spectroscopy (DRS). The physical properties of prepared TiO2 were examined by X-ray diffraction (XRD), scanning electron microscopy (SEM), photoluminescence spectrometer (PL), particle size distribution measurements. The crystallite size and crystallinity of prepared TiO2 increased with increasing titanium (IV) sulfate (Ti(SO4)2) concentration, but photocatalytic activity decreased. The crystallite size decreased with increasing pH of mixture solution, but photocatalytic activity increased. The crystallinity and photocatalytic activity increased with increasing reaction temperature. The results showed that anatase type TiO2 could be prepared_x000D_ by hydrothermal precipitation method using titanium (IV) sulfate (Ti(SO4)2) solution and ammonia solution at low reaction temperature and atmospheric pressure without calcination.

Titanium Dioxide Hydrothermal Precipitation Photocatalytic Decomposition Brilliant Blue FCF

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