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The Effect of Temperature on Polymer Supported Titanium Dioxide Photocatalyst for Degradation of Volatile Organic Compounds

Excerpt

This study used a combination of photocatalytic oxidation (PCO) reaction and electromagnetic field for benzene (486 ± 129.07 ppb) or toluene (704 ± 77.00 ppb) degradation in air. To develop surface morphology and PCO reaction, the application of a polymer (polyethylene glycol 4000; PEG 4000) support for nano-dispersed commercial P25 TiO2 on a high efficiency particulate air (HEPA) filter was investigated for the effect of varying baking temperatures, i.e. below and above melting point (50 and 100°C, respectively) of the PEG 4000. The HEPA filters were dip-coated with different amounts of the TiO2 and PEG 4000 and their surface morphology was assessed with scanning electron microscopy (SEM) and mechanical properties. Performance of the PCO reactions and an electromagnetic field was assessed in a testing chamber at 0.54 m/s of air velocity, UV-A intensity of 2.73 ± 0.33 mW/cm2, 50 ± 10% of relative humidity and irradiation time of 20-–120 min. It was found that the most of using a baking temperature at 100°C for a HEPA filter coated with a 7% TiO2/7% PEG 4000 suspension (by weight) in preparation or a HEPA filter coated with a 5% TiO2/20% PEG 4000/1% DURAMAX D3005 suspension were better the benzene or toluene degradation than using the later preparation baked at 50°C, for which the viscosity and cracks on these coated filters were observed when using baking temperature at 100°C. Although the HEPA filter coated with a 5% TiO2/20% PEG 4000/1% DURAMAX D3005 suspension and baked at 50°C achieved the lower benzene or toluene degradation than the other coated filters, this coated filter was appropriate application in clean air technology with more safe using this nano-material for human and environment.

  • Abstract
  • Key Words
  • 1 Introduction
  • 2. Materials and Methods
  • 3. Results
  • 4. Discussions
  • 5. Summaries
  • 6. Acknowledgements
  • References

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