화학공학소재연구정보센터
홈 로그인 로그아웃 연락처 사이트맵
HWAHAK KONGHAK, Vol.38, No.2, 288-295, April, 2000
Export Citation
Mo/Ti 혼합광촉매와 TiO2 광촉매의 제조 및 평가; 순환반응에 의한 기상 Trichloroethylene의 광촉매 반응 분석
Preparation and Characterization of Mo/Ti Mixed Oxide and TiO2 Photocatalysts; Photocatalytic Degradation of Trichloroethylene in Gas-phase Using Circulation System
윤재경, 윤우석1, 주현규, 전명석, 이태규†
  • 한국에너지기술연구소 태양에너지변환연구센터
  • 1연세대학교 화학공학과
Jae Kyung Yoon, Woo Sug Yoon1, Hyun Ku Joo, Myung Seok Jeon, and Tai Kyu Lee†
  • Photocatalysis and Photoelectrochemistry Research Center, Korea Institute of Energy Research, Korea
  • 1Department of Chemical Engineering, Yonsei University, Korea
E-mail:
초록
본 연구에서는 순수 TiO2 및 molybdenum doped TiO2(Mo/Ti) 혼합광촉매를 제조하여 대기오염원인 휘발성 유기화합물(volatile organic compound, VOC) 의 일종인 trichloroethylene(TCE)을 광분해 반응하였다. 제조한 광촉매를 유리구슬에 코팅하여 튜브형 반응기에 충진하였으며, 초기농도 150ppm 인 TCE를 순환 반응하여 TCE 및 TCE의 중간생성물을 GCMSD로 분석하여 반응경로를 파악하였다. 반응결과 중간생성물로 DCA(Dichloroacetyl Chloride), chloroform, Carbon tetrachloride, tetrachloroethane, pentachoroethane이 검출되었다. 또 산소농도 변화에 대한 TCE 및 중간 생성물의 제거경향을 파악하였는데 그 결과 산소의 양이 증가할수록 중간생성물이 더 빠르게 감소함이 관찰되어 산소의 영향이 크다는 것을 알 수 있었다. 제조된 촉매별로 TCE의 분석결과 450℃에서 2시간 열처리한 순수 TiO2(anatase)가 가장 효율이 좋았으며 UV/Visible spectrum으로 촉매의 흡수파장을 측정한 결과 순수 TiO2의 흡수파장대와 비교하여 Mo의 첨가량이 증가할수록 가시광선 영역으로 red-shift되는 것을 관찰할 수 있었다. 또한 제조된 광촉매들을 DTA-TG, XRD로 분석한 결과 300-450℃에서 anatase로의 상전이가 일어남을 관찰할 수 있었으며, 제조된 광촉매를 이용한 액상 dichloroacetic acid(DCA) 분해 반응의 photonic efficiency(P.E.)를 측정해 본 결과 순수 TiO2(P.E.=15%)가 Mo/Ti(P.E.=11%)보다 우수함이 관찰되었다.
Photocatalysis of trichloroethylene (TCE) with TiO2 and molybdenum-doped TiO2(Mo/Ti) mixed oxide was studied in this work using a tubular quartz reactor packed with photocatalyst-coated glass beads. The initial TCE concentration of 150 ppm, was recirculated with the different inlet oxygen concentration. The change in intermediates during photoreaction of TCE was monitored with a GC-ECD and a GC-MSD. Dichloroacethyl chloride(DCAC), chloroform, carbon tetra chloride, tetrachloroethane and pentachloroethane were identified as intermediates. It was observed that oxygen concentration affected the formation and the disappearance of intermediates. As oxygen concentration increased disappearance rates of intermediates and TCE increased. Pure TiO2 increased. Pure TiO2 thermally treated at 450℃ for 2h exhibited the best conversion ratio of TCE among other photocatalysts tested. The characteristics of the photocatalysts were also examined employing UV/Visible spectrophotometer, TG-DAT, and XRD. Absorption spectra of UV/VIS indicated that the onset of absorption curve was red-shifted as Mo concentration was increased. The phase change to anatase was observed with heat treatment at 300-450℃. The photonic efficiency was measured using dichloroacetic acid, and 15% of photonic efficiency for pure TiO2 and 11% for Mo/Ti were obtained.
Keywords:TiO2;Mo/Ti Mixed Oxide;Photocatalysis;TCE
  1. Joo HK, Jeon MS, Lee TK, J. KSEE, 21(6), 1231 (1999)
  2. Ollis DF, Al-Ekabi H, "Photocatalytic Purification and Treatment of Water and Air," Elsevier, Ontario (1992)
  3. KIER 966403/2, MOST, 62 (1996)
  4. Choi W, Ph.D. Dissertation, California Institute of Technology, Pasadena(CA) U.S.A., 11 (1996)
  5. Jeon HJ, "Catalyst," Hanrimwon, 73 (1995)
  6. Jeon MS, Lee TK, Kim DH, Joo H, Kim HT, Sol. Energy Mater. Sol. Cells, 57(3), 217 (1999) 
  7. Song M, Master thesis, Chungnam National University, 23 (1998)
  8. Yoon JK, Master thesis, Yonsei University, 32 (1999)
  9. Yoon JK, Kang JW, Lee TK, Joo HK, Jeon MS, J. KSEE, 21(5), 1003 (1999)
  10. KIER-972123, MOST, 50 (1997)
  11. Rao NN, Dube S, Natarajan P, Proceeding of International Conference on TiO2; "Photocatalytic Purification and Treatment of Water and Air," Elsevier, 695 (1993)
  12. KIER-982223, MOST, 38 (1998)
  13. Chung HH, Benito J, Marinas J, Environ. Sci. Technol., 31, 562 (1997) 
  14. Yamazaki S, Fu X, Anderson MA, Hori K, J. Photochem. Photobiol. A-Chem., 97, 175 (1996) 
  15. Chung HH, Benito J, Marinas J, Environ. Sci. Technol., 31, 1440 (1997) 
  16. Nimlos MR, Wolfrum EJ, Brewer ML, Fennell JA, Bintner G, Environ. Sci. Technol., 30, 3102 (1996) 
  17. Calza P, Minero C, Pelizeti E, Environ. Sci. Technol., 31, 2198 (1997) 
  18. Jung KT, Shul YG, Anpo M, Yamashita H, Korean J. Chem. Eng., 14(3), 213 (1997)
  19. Lee SG, Lee HI, Korean J. Chem. Eng., 15(5), 463 (1998)
  20. Kim KY, Park SB, HWAHAK KONGHAK, 36(1), 116 (1998)