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제108회 대한화학회 학술발표회, 총회 및 기기전시회 안내 Synthesis of polyanliline-TiO2 composite with enhanced photocatalytic activity and characterization by field-flow fractionation (FFF)

2011년 8월 1일 16시 30분 31초
Ⅳ-ANAL.P-213 이곳을 클릭하시면 발표코드에 대한 설명을 보실 수 있습니다.
금 <발표Ⅳ>
저자 및
이덕형, 이승호, DouHaiyang
한남대학교 화학과, Korea
An important approach to improve the photocatalytic activity of TiO2 is to form its composite with other semiconductor materials of different band gaps. Also, encapsulation of TiO2 nanoparticles inside the shell of conducting polymers is interesting aspect of nanocomposite synthesis. Conjugating polymers, such as polyaniline and polythiophene, have shown great promises since they are electron donor upon visible light irradiation in the excited state. In this study, polyaniline (PAn) modified TiO2 composite was prepared by one-step in situ polymerization method in the presence of lab-prepared anatase TiO2 nanoparticles (NPs). The TiO2 NPs were synthesized by sol-gel process prior to the polymerization. The obtained TiO2 NPs and PAn-TiO2 composite were characterized by Fourier-transform infrared spectra (FTIR), thermogravimetric analysis (TGA), X-ray diffraction (XRD), and scanning electron microscope (SEM). The sizes of the TiO2 NPs and PAn-TiO2 composite determined by field flow fraction (FFF) were compared to those obtained by dynamic light scattering (DLS). The average diameter of NPs was 100 nm (ranging from 20 to 180 nm) measured by FFF. The preliminary tests indicate that the prepared TiO2 NPs are sufficiently active for photocatalytic degradation of CH3 CHO, which was similar to that displayed by Degussa P-25 under UV irradiation. Under visible light irradiation, the photocatalytic activity of PAn-TiO2 composite has been investigated for the photodegradation of methylene blue in a suspension system.