A Comparative Study on Degradation of BTEX Vapor by O3/UV, TiO2/UV, and O3/TiO2/UV System with Operating Conditions

운전조건에 따른 O3/UV, TiO2/UV 및 O3/TiO2/UV 시스템의 BTEX 증기처리에 관한 비교 연구

  • Kim, Kyoung-Jin (Department of Environmental Engineering, Pusan National University) ;
  • Park, Ok-Hyun (Department of Environmental Engineering, Pusan National University)
  • 김경진 (부산대학교 환경공학과) ;
  • 박옥현 (부산대학교 환경공학과)
  • Published : 2008.02.29


A multilayer tower-type photoreactor, in which $TiO_2$-coated glass-tubes were installed, was used to measure the vapor-phase BTEX removal efficiencies by ozone oxidation ($O_3$/UV), photocatalytic oxidation ($TiO_2$/UV) and the combination of ozone and photocatalytic oxidation ($O_3/TiO_2$/UV) process, respectively. The experiments were conducted under various relative humidities, temperatures, ozone concentrations, gas flow rates and BTEX concentrations. As a result, the BTEX removal efficiency and the oxidation rate by $O_3/TiO_2$/UV system were highest, compared to $O_3$/UV and $TiO_2$/UV system. The $O_3/TiO_2$/UV system accelerated the low oxidation rate of low-concentration organic compounds and removed organic compounds to a large extent in a fixed volume of reactor in a short time. Therefore, $O_3/TiO_2$/UV system as a superimposed oxidation technology was developed to efficiently and economically treat refractory VOCs. Also, this study demonstrated feasibility of a technology to scale up a photoreactor from lab-scale to pilot-scale, which uses (i) a separated light-source chamber and a light distribution system, (ii) catalyst fixing to glass-tube media, and (iii) unit connection in series and/or parallel. The experimental results from $O_3/TiO_2$/UV system showed that (i) the highest BTEX removal efficiencies were obtained under relative humidity ranging from 50 to 55% and temperature ranging from 40 to $50^{\circ}C$, and (ii) the removal efficiencies linearly increased with ozone dosage and decreased with gas flow rate. When applying Langmuir-Hinshelwood model to $TiO_2$/UV and $O_3/TiO_2$/UV system, reaction rate constant for $O_3/TiO_2$/UV system was larger than that for $TiO_2$/UV system, however, it was found that adsorption constant for $O_3/TiO_2$/UV system was smaller than that for $TiO_2$/UV system due to competitive adsorption between organics and ozone.


Photocatalytic oxidation;Titanium dioxide;Photoreactor;$O_3/TiO_2$/UV system


  1. 강준원, 박훈수, 최광호 (1995) 이산화티타늄 광촉매에서의 광분해반응에 의한 유기물질 제거에 관한 연구, 대한환경공학회지, 17(3), 283-294
  2. Hanger, S., R. Bauer, and G. Kudielka (2000) Photocatalytic oxidation of gaseous chlorinated organics over titanium dioxide, Chemosphere, 41, 1219-1225
  3. Kim, S.B., H.T. Hwang, and S.C. Hong (2002) Photocatalytic degradation of volatile organic compounds at the gas-solid interface of a $TiO_2$ photocatalyst, Chemosphere, 48, 437-444
  4. Wang, K.H., H.H. Tsai, and Y.H. Hsieh (2003) Decomposition of benzene in air streams by UV/$TiO_2$ process, J. Hazard. Mater. B, 101, 133-146
  5. Lu, M.C., G.D. Roam, and J.N. Chen (1993) Factors affecting the photocatalytic degradation of dichlorvos over titanium dioxide supported on glass, J. Photochem. Photobiol. A: Chem, 76, 103
  6. 손현석, 양원호, 김현용, 이소진, 박종래, 조경덕 (2003) 세라 믹과 유리에 코팅한 $TiO_2$ 광촉매를 이용한 가스 상 벤젠의 제거, 한국대기환경학회지, 19(1), 57- 66
  7. Cho, K.C. and H.G. Yeo (2006) Photocatalytic decomposition of gaseous acetaldehyde by metal loaded $TiO_2$ with ozonation, J. KOSAE, 22(E1), 19-26
  8. Ameen, M.M. and G.B. Raupp (1999) Reversible catalyst deactivation in the photocatalytic oxidation of dilute o-xylene in air, J. Catal., 184, 112-122
  9. Celik, E., I. Keskin, I. Kayatekin, I. Azem, and E. Ozkan (2007) $Al_2O_3-TiO_2$ thin films on glass substrate by sol-gel technique, Mater. Characteriz., 58, 349-357
  10. 서정민, 정창훈, 최금찬(2002) 대기 중 휘발성 유기화합물의 광산화 공정 및 광촉매산화 공정의 처리효율 비 교, 한국대기환경학회지, 18(2), 139-148
  11. Rafael, M.R. and C.M. Nelson (1998) Relationship between the formation of surface species and catalyst deactivation during the gas-phase photocatalytic oxidation of toluene, Catal. Today, 40, 353-365
  12. Wu, J.F., C.H. Hung, and C.S. Yuan (2005) Kinetic modeling of promotion and inhibition of temperature on photocatalytic degradation of benzene vapor, J. Photochem. Photobiol. A: Chem., 170, 299-306
  13. Cao, L., Z. Gao, S.L. Suib, T.N. Obee, S.O. Hay, and J.D. Freihaut (2000) Photocatalytic oxidation of toluene on nanoscale $TiO_2$ catalysts: studies of deactivation and regeneration, J. Catal., 196, 253-261
  14. Zhang, P. and J. Liu (2004) Photocatalytic degradation of trace hexane in the gas phase with and without ozone addition: kinetic study, J. Photochem. Photobiol. A: Chem., 167, 87-94
  15. Yu, K.P. and G.W.M. Lee (2007) Decomposition of gas-phase toluene by the combination of ozone and photocatalytic oxidation process ($TiO_2$/UV, $O_3$/UV and $O_3/TiO_2/UV$), Appl. Catal. B: Environ., 75, 29-38
  16. 박옥현, 박순희, 한정훈, 정인경(2000) 미생물을 이용한 휘발 성 유기화합물(VOC) 가스 처리에 관한 실험적 연구 (I)-톨루엔 처리, 대한환경공학회지, 22(8), 1417-1427
  17. Wang, K.H., H.H. Tsai, and Y.H. Hsieh (1998) The kinetics of photocatalytic degradation of trichloroethylene in gas phase over $TiO_2$ supported on glass bead, Appl. Catal. B: Environ., 17, 313-320
  18. Larson, S.A. and J.L. Falconer (1994) Characterization of $TiO_2$ photocatalysts used in trichloroethene oxidation, Appl. Catal. B: Environ., 4(4), 325-342
  19. Zhang, P., F. Liang, G. Yu, Q. Chen, and W. Zhu (2003) A comparative study on decomposition of gaseous toluene by $O_3$/UV, $TiO_2$/UV and $O_3/TiO_2/UV$, J. Photochem. and Photobiol. A: Chem., 156, 189-194
  20. Ray, A.K. and A.A.C.M. Beenackers (1998) Development of a new photocatalytic reactor for water purification, Catal. Today, 40, 73-83