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Photocatalyst Titanium Nanotubes Study Treatmen t of Volatile Organic Compounds

Photocatalyst Titanium Nanotubes Study Treatmen t of Volatile Organic Compounds. Introduction. Literature Review. Experimental Methods and Equipment. Results and Discussion. Conclusions. Syllabus. Equipment Schematic Preparation of Catalyst. Characteristic Analysis Reactor System.

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Photocatalyst Titanium Nanotubes Study Treatmen t of Volatile Organic Compounds

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  1. Photocatalyst Titanium Nanotubes Study Treatment of Volatile Organic Compounds

  2. Introduction Literature Review Experimental Methods and Equipment Results and Discussion Conclusions Syllabus Equipment Schematic Preparation of Catalyst Characteristic Analysis Reactor System Characteristic Analysis Performance Assessment Langmuir-Hinshelwood Kinetic Model National I-lan University, Taiwan

  3. Introduction Motivation Volatile Organic Compounds, VOCs • Suspended particles and ozone are the most important index. • The ozone is produced by nitrogen oxides and VOCs. (Doucet et al., 2006) • Major sources of contamination in the environment (Borisch al., 2004). • VOCs lead to secondary pollutants. • Stimulate the human body. (Jo et al., 2002) National I-lan University, Taiwan

  4. Introduction Motivation Acetone Characteristics • Inhalation may cause drowsiness, nausea, vomiting, feeling drunk and dizzy. • The liquid with a severe irritation to the eyes. • Swallowed will cause irritation to the pharynx, esophagus and stomach. • Prolonged or frequent contact may cause skin fat and dermatitis. National I-lan University, Taiwan

  5. Introduction Motivation Treatment Methods Data Source：馬志明，1998；陳祐誠，2009 National I-lan University, Taiwan

  6. Titanium dioxide Photocatalysis Introduction Motivation EnergyPreparation is easyLow pricesNon-toxicHigh efficiencyStrong physical stabilitySmall operating equipmentSimple procedures National I-lan University, Taiwan

  7. Tubular structures High adsorption Mesoporous Motivation Titanium Dioxide Nanotube High efficiency Large surface area National I-lan University, Taiwan

  8. Objectives • Prepared by hydrothermal system Fe-TNT catalyst. • Doped Fe-TNT photocatalyst of the physical and chemical analysis. • Acetone removal assessment dealing with Fe-TNT. • Evaluation of photocatalytic energy efficiency. • Establishment of the best kinetic model. National I-lan University, Taiwan

  9. Literature Review National I-lan University, Taiwan

  10. Literature Review 1991 2009 2010 2010 Iijima et al. Seo et al. Song et al. Nishijima et al. At the same time doping metal (Fe) and non-metallic (S) were modified. Modification of the TNT iodine doped. First published in the journal Nature in the hollow tubular carbon nanotubes. Photocatalyst used in the TNT sensor. National I-lan University, Taiwan

  11. Literature Review 2010 2010 2010 2011 Xiao et al. Ho et al. Peng et al. Grandcolas et al. Silver were modified and applied to biological treatment. Photocatalyst used in the TNTDye Sensitized Solar Cell. Photocatalyst used in the TNT photoelectrochemical hydrogen generation. Doped with nitrogen were modified and applied to wastewater Treatment. National I-lan University, Taiwan

  12. Experimental methods and Equipment Equipment Schematic Preparation of Catalyst Characteristic Analysis Reactor System National I-lan University, Taiwan

  13. Preparation of the catalyst Establishment of reaction systemand stability testing Experimental design andPlanning Research Experimental analysis, characteristics of catalysts Literature review Metal contentResidence timeCatalyst TypeConcentrationLight sourceRH Experimental analysis Photocatalytic degradation / adsorptionperformance testing Establishment of kinetic model Experimental Structure National I-lan University, Taiwan

  14. Preparation of Catalyst P25+Fe (NO3)3．9H2O Autoclave 130℃ / 72 hr Furnace 10 M NaOH Cleaning National I-lan University, Taiwan

  15. Characteristic Analysis • Optical information UV-Vis analysis. • Crystal information • XRPD analysis. • B.E.T. analysis. • HR-TEM analysis. Surface morphology SEM Mapping analysis National I-lan University, Taiwan

  16. Reactor System 1.Air and Acetone 2.Flow meter 3.Humidifier equipment 4. Mixed chamber 5.Two way valve 6.Three way valve 7. Photoreactor 8. Active carbon 9. Gas Chromatography National I-lan University, Taiwan

  17. Operating Parameters National I-lan University, Taiwan

  18. Resultsand Discussion Characteristic Analysis Performance Assessment Langmuir-Hinshelwood Kinetic Model National I-lan University, Taiwan

  19. Particles Tubular Surface Morphology SEM Mapping analysis TiO2-P25 TNT Fe-TNT Tube length of approximately between 500 nm to several μm National I-lan University, Taiwan

  20. Crystal Information XRPD Analysis (25.3) (48.1) (37.8) (55.1) (62.7) National I-lan University, Taiwan

  21. Crystal Information B.E.T Analysis TNT 5wt％Fe-TNT National I-lan University, Taiwan

  22. Crystal Information TNT 5wt％Fe-TNT National I-lan University, Taiwan

  23. 18 nm 5 nm 5 nm 20 nm Crystal Information HR-TEM analysis 20 nm TNT 1wt％Fe-TNT National I-lan University, Taiwan

  24. Optical Information UV-Vis Analysis National I-lan University, Taiwan

  25. Optical Information Kuo et al., (2007) National I-lan University, Taiwan

  26. Performance Assessment Blank test Concentration Retention Time Relative Humidity Metal Light source National I-lan University, Taiwan

  27. Performace Assessment Blank test Temperature: 25℃ Pressure: 1 atm Retention time: 1 min Relative humidity: 0% Concentration: 1000 ppm Light source:UV-365 nm Light source: LED-365 nm In a different light sources for direct photolysis efficiency, its efficiency is about 5%. National I-lan University, Taiwan

  28. Performace Assessment Light source: LED-Visible National I-lan University, Taiwan

  29. Effect of Concentration Temperature: 25℃ Pressure: 1 atm Retention time: 1 min Relative humidity: 0% Light source: UV-365 nm Light source: LED-365 nm National I-lan University, Taiwan

  30. Effect of Concentration Light source: LED- visible National I-lan University, Taiwan

  31. Effect of Relative Humidity Temperature: 25℃ Pressure: 1 atm Retention time: 1 min Concentration: 1000 ppm Light source: UV-365 nm Light source: LED-365 nm National I-lan University, Taiwan

  32. Effect of Relative Humidity Light source: LED-visible National I-lan University, Taiwan

  33. Effect of Retention Time Temperature: 25℃ Pressure: 1 atm Concentration: 1000 ppm Relative humidity: 0% Light source: UV-365 nm Light source: LED-365 nm National I-lan University, Taiwan

  34. Effect of Retention Time Light source: LED-visible National I-lan University, Taiwan

  35. Effect of Metal 3 wt% Fe-TNT the best efficiency Doped metal modification can improve processing efficiency.Yu et al., 2010 National I-lan University, Taiwan

  36. Effect of Light source UV light source of traditional and high efficiency as the excitation source. At high concentration (1000ppm) LED light source efficiency of conventional UV light source close to. *L-LED National I-lan University, Taiwan

  37. Energy Effectiveness Kinetic Model National I-lan University, Taiwan

  38. Energy Effectiveness TNT P25 Shie et al., 2008 National I-lan University, Taiwan

  39. Energy Effectiveness 1 wt%Fe-TNT 3 wt%Fe-TNT National I-lan University, Taiwan

  40. Energy Effectiveness 5 wt%Fe-TNT National I-lan University, Taiwan

  41. Kinetic Model C： Concentration(ppm) kdeg：Specific rate constant(mol min-1m-2) KLH：Adsorption constant(ppm-1) National I-lan University, Taiwan

  42. Conclusions National I-lan University, Taiwan

  43. Conclusions • XRPD • Fe-TNT does not cause the destruction of crystalline structure. • Fe-TNT does not cause phase transformation of metal and become rutile. • UV-vis absorption spectroscopy • Band gap energy increases with the increase in the proportion of Fe doping • Red shift. • B.E.T analysis • BET surface area for 390 m2g-1. • Fe-TNT surface area for 375, 243, 202 m2g-1. National I-lan University, Taiwan

  44. Conclusions • SEM analysis • Tube length about 500 nm - several μm • Degradation efficiency - effect of Concentration • at 250 ppm, TNT catalyst: degradation efficiency of 80-90%. • at 1000 ppm, 3wt% Fe-TNT catalyst: degradation efficiency of 45%. • Degradation efficiency - effect of Retention Time • Retention time 4 min is the best degradation efficiency • P25 degradation efficiency of 20% • 3 wt% Fe-TNT degradation efficiency of 80% National I-lan University, Taiwan

  45. Conclusions • Degradation efficiency - effect of Retention Humidity • 3 wt% Fe-TNT, relative humidity 35%: 50%. • 45% humidity, 3 wt%Fe-TNT: 38%. • Degradation efficiency - effect of Light source • Traditional UV light source for the best • LED-365 nm and the LED-visible difference of about 10%. • Degradation efficiency - effect of Catalyst • 1,3 and 5 wt% Fe-TNT photocatalyst more better than P25 • 3 wt% Fe-TNT photocatalystwith the highest efficiency National I-lan University, Taiwan

  46. Conclusions • Kinetic model • Consistent with Langmuir-Hinshelwood kinetic model • The reaction rate constant is 0.0543 mol min-1m-2. • High concentration and low reaction time • New UV-LED light source less than traditional UV light about 1.5 mg kW-1 h-1. • 3 wt% Fe-TNT has the highest energy efficiency. National I-lan University, Taiwan

  47. Thank You !

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