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Received April 14, 2008
Accepted April 19, 2008
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광촉매와 암방전(dark discharge) 복합 시스템을 이용한 VOC의 분해
Degradation of VOC by Photocatalysts and Dark Discharge Hybrid Systems
경기대학교 화학공학과, 443-760 경기도 수원시 영통구 이의동 산94-6
Department of Chemical Engineering, Kyonggi University, 94-6 Yiui-dong, Yeongtong-gu, Suwon, Gyeonggi-do 443-760, Korea
jhjung@kgu.ac.kr
Korean Chemical Engineering Research, October 2008, 46(5), 852-857(6), NONE Epub 10 November 2008
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Abstract
광촉매의 고정화는 광촉매의 이용범위를 넓히기 위해서 매우 중요한 기술이다. 광촉매를 고정화시키기 위해 티타늄 표면을 양극산화 시켜 TiO2로 전환시킬 수 있다. 양극산화에 의해 제조된 TiO2는 광촉매 활성을 가지고 있으며 표면은 스펀지와 비슷한 형태를 나타내었다. 다양한 초기농도, 습도, 방전전압 하에서 양극산화에 의해 티타니아를 제조 이를 이용하여 기상의 아세트알데히드와 VOC의 광촉매 분해반응을 연구하였다. 양극산화 티타니아의 반응성은 상대습도가 증가함에 따라 증가하였으나 너무 높은 습도는 반응성을 감소시켰다. 광촉매 반응과 전기 방전을 결합시키면 VOC 제거효율이 크게 증가 되었으나, 과도한 전압을 가하여 코로나 방전이 발생되면 반응속도가 오히려 감소되었다. 최적 상대습도는 40%였으며 최적 방전전압은 암방전 영역인 5 kV였다.
The immobilization technique is important to extend the application field of a photocatalyst. Titanium surface was changed into a TiO2 thin film by the anodizing process. The anodized TiO2 had photocatalytic activity, and showed sponge like shape. The photocatalytic degradation of gas phase acetaldehyde and VOCs by anodized titania has been studied in various initial concentrations, humidity and discharge potentials. The reactivity of anodized titania was_x000D_
increased with relative humidity, but excessive humidity led to a decrease of the reaction rate. The electric dark discharge that was combined with photocatalytic reaction enhanced the decomposition rate of the organic compounds. But excessively applied voltage caused corona discharge, which decreased the reaction rate. Optimum relative humidity was 40% and discharge potential was 5 kV under dark discharge region in photocatalytic reaction.
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