수열합성법에 의한 TiO2/active carbon 복합체의 제조 및 광촉매특성
Synthesis of TiO2/active carbon composites via hydrothermal process and their photocatalytic performance
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입상(대나무)활성탄 상에 나노 TiO2 결정을 담지 즉 분말코팅 하였다. 이와 같이 TiO2 담지된 활성탄 복합체의광촉매 활성도는 자외선 조사를 통한 메틸렌블루 수용액의 분해를 통해 측정하였다. 저온 수열합성법(≤ 200oC, pH 11)을 통해 광학적 촉매활성도가 높은 TiO2를 활성탄 상에 담지 할 수 있었으며, BET 표면적을 측정하여 계산된 TiO2 분말의 평균입도는 50 nm 정도였다. 수열처리 과정에서 TiO2가 합성되면서 동시에 활성탄의 표면 공극과 기공 상에 코팅이 이루어졌다. 이러한 수열합성법을 통한 합성은 TiO2의 anatase에서 rutile로의 상전이 시작 온도를 200oC 부근으로 낮추는 결과를 가져올수 있어, 합성온도에 따라 저온에서 순수한 anatase 또는 anatase와 rutile이 혼합된 TiO2 결정상들을 코팅 시킬 수 있었다.
Abstract
Granular bamboo-derived active carbons (AC) were impregnated (or coated) with TiO2 nano crystalline powders. The photocatalytic activity of the TiO2-impregnated active carbons (TiO2/AC) were determined on the basis of the degradation rate of methylene-blue aqueous solution under UV irradiation. The active compounds of TiO2 were impregnated onto the AC under moderate hydrothermal conditions (≤ 200oC, pH 11). The mean size of TiO2 particles calculated from BET surface area were found to be as 50 nm. The TiO2 precipitates were coated on the cavities or pores on the surfaces of highly activated carbons. Since the hydrothermal process led to a lowering of the on-set temperature of the anatase-torutile transition of TiO2 as low as 200oC, TiO2 crystallites of a pure anatase or a mixed form with rutile were successfully coated on the AC depending on the synthesis temperatures.
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