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제114회 대한화학회 학술발표회, 총회 및 기기전시회 안내 Efficient decomposition of organic pollutant under visible light irradiation by Double Heterojunction structure of FeWO4/TiO2/CdS

등록일
2014년 8월 28일 16시 57분 01초
접수번호
1337
발표코드
MAT.P-1156 이곳을 클릭하시면 발표코드에 대한 설명을 보실 수 있습니다.
발표시간
10월 15일 (수요일) 16:00~19:00
발표형식
포스터
발표분야
재료화학
저자 및
공동저자
SANDIPAN BERA, 이완인*
인하대학교 화학과, Korea
Dark brown color FeWO4 nanoparticles of average size 50-70 nm was prepared by hydrothermal method which showed a profound absorption over the entire visible range. A heterojunction between FeWO4 and TiO2 was made by simple sol-gel method. The haterojunction shows notably high visible light photocatalytic activity in decomposing Isopropanol (IP) in gas phase and Salicylic acid in liquid phase. . 5/95 FeWO4/TiO2 shows 1.7 times higher CO2 evolution and 2.5 time high rate constant for decomposition of SA compare to N-doped TiO2 , a well known visible light Photocatalyst. The valence band (VB) position of FeWO4 (+2.8 eV vs NHE) is lower than that of TiO2 (+2.7 eV). The high photocatalytic efficiency of the FeWO4/TiO2 composite is caused by intersemiconductor hole transfer from VB of FeWO4 to VB of TiO2. Subsequently, a double-heterojunction FeWO4/TiO2 /CdS structure was prepared by loading CdS quantum dots (QDs) onto the surface of the FeWO4/TiO2, which dramatically enhanced the visible-light photocatalytic efficiency. The catalytic activity of FeWO4/TiO2 /CdS in evolving CO2 from IP, was ~ 2.6 times that of FeWO4/TiO2 .The unexpectedly high efficiency of FeWO4/TiO2 /CdS seemingly is due to the unique band matching among these semiconductors. With sensitization of FeWO4 and CdS, not only the holes but also the electrons are generated in the VB and CB, respectively, of TiO2 under visible-light irradiation.

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