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Impact of Calcination Atmospheres on the Physiochemical and Photocatalytic

Impact of Calcination Atmospheres on the Physiochemical and Photocatalytic of Nanocrystalline TiO 2 and Si-doped TiO 2 Professor Piyasan Praserthdam Centre of Excellence on Catalysis and Catalytic Reaction Engineering, Department of Chemical Engineering, Chulalongkorn University.

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Impact of Calcination Atmospheres on the Physiochemical and Photocatalytic

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  1. Impact of Calcination Atmospheres • on the Physiochemical and Photocatalytic • of Nanocrystalline TiO2 and Si-doped TiO2 Professor PiyasanPraserthdamCentre of Excellence on Catalysis and Catalytic Reaction Engineering,Department of Chemical Engineering, Chulalongkorn University

  2. Introduction Kazuya Nakata and Akira Fujishima, Journal of Photochemistry and Photobiology C: Photochemistry Reviews 13 (2012) 169– 189. A.R. Khataee and M.B. Kasiri, Journal of Molecular Catalysis A: Chemical 328 (2010) 8–26.

  3. Introduction • Preparation of TiO2 solvothermal method sol–gel method • To improve photocatalytic activity Si-doped TiO2showed • high photocatalytic activity • reduction in phase transformation from anatase to rutile • increase in formation of oxygen vacancies • enhancement of the thermal stability

  4. Experimentals • Preparation of catalysts • Solvothermal method • Sol-Gel method • Characterization • XRD • UV/Vis spectrometer • XPS • Photocatalysis • Liquid Phase Photocatalysis

  5. Experimentals • Preparation of catalysts • Solvothermal method Titanium-N-Butoxide TEOS 1,4-butanediol 1,4-butanediol washed with methanol and dried in air • fired in gas flow at 450°C for 2 hr. Heat 300oC rate of 2.5 oC/min hold 2 hr. Si/TiO2

  6. Experimentals • Preparation of catalysts • Sol-gel method Si-doped TiO2 TiO2 Si/TiO2 • fired in gas flow at 450°C for 2 hr. dried at 110°C TiO2 sol TEOS (Si) Stirred mixture for 2 hr. TTIP = TitaniumTetraisopropoxide

  7. Experimentals Characterization XRD UV/Vis spectrometer

  8. Experimentals UV: 500 W Mercury lamp (Philips) Visible: 250 W Metal halide lamp (Philips) remove any suspended solid Sample solution every 15 mins 200 mL of 20 ppm Methylene blue 30 mg of catalysts 1.30 hours using the UV–vis spectrophotometer at a wavelength of 665 nm to measure the sample

  9. Results XRD patterns

  10. Results

  11. Results XPS analysis 457.5 eV is Ti3+

  12. Results UV-vis spectra TiO2_SVT_N 1%Si/TiO2_SVT_N TiO2_SG_N

  13. Results ESR Ti3+ O2-

  14. Results 1%Si/TiO2_SVT_N 1%Si/TiO2_SG_O 1%Si/TiO2_SVT_N 1%Si/TiO2_SG_O

  15. Summarize

  16. Conclusion Si-doped titanium dioxide that was prepared by the solvothermal method and was calcined under nitrogen atmosphere exhibit the highest photocatalytic activity, compared with the photocatalyst that was prepared by the sol-gel method in experiments under both UV light and visible light irradiations.

  17. Acknowledgment LIMPID project ““Nanocomposite Materials for Photocatalytic Degradation of Pollutants” EU funded in 7 FP NMP (n.310177) iskindlyacknowledged

  18. Summarize

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