Preparation of Mesoporous Titania Photocatalyst for Water Treatment Application Xingdong Wang 1 , David R.G.Mitchell 2 , P...
My background
Environmental pollution remediation  ---principle of photocatalysis <ul><li>High recombination rate of e - /h +  pairs (~9...
Outline of Porous TiO 2  Project ---Environmental pollution remediation  Enhancing photocatalytic (PC) activity <ul><li>UV...
Synthesis of porous TiO 2  materials Composition Composition and  Crystal phase Morphology : beads Morphology : fibre X .D...
TiCl 3 Amorphous TiO 2 Crystallized  TiO 2  Synthesis scheme   Hydrolysis & condensation NaOH  Washing  Solvothermal: 160 ...
Surface area
Pore size distribution
Morphology-SEM 0.25 7.98 11.58
Morphology  and porosity  - T EM 0.25 11.58 7.98
Crystal phase Anatase Rutile Titanate Acid condition: rutile phase Neutral condition: anatase phase (slight brookite) Alka...
Surface hydroxyl groups (FT-IR) Ti-OH Ti…H 2 O
Diffuse UV-Vis and band gap
Diffuse UV-vis and Band gap   pH 0.25 0.56 7.92 7.98 9.67 11.58 P25 Bg (eV) 3.00 2.98 3.13 3.15 3.25 3.22 3.10
Adsorption test Test conditions: 100 ppm In the dark: shaking overnight (pH 5.10)
<ul><li>Set up: 500 Watt Hg(Xe) lamp with band pass visible light filter (420-650 nm) </li></ul><ul><li>Methylene blue (MB...
Photocatalytic activity Test conditions: 12.5 ppm of MB Visible light: 120 min at pH 5.10 pH
Conclusions <ul><li>Solvothermal treatment produced high surface area TiO 2 . </li></ul><ul><li>The material properties ar...
Acknowledgements <ul><li>My supervisor (Dr Rachel Caruso) & group members  </li></ul><ul><li>Internal collaborations (Dr P...
CSIRO Materials Science and Engineering Dr Xingdong Wang Ph: +61 3 9545 2689 Email:  [email_address] Web:  www.csiro.au/cm...
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ICWES15 - Preparation of Mesoporous Titania Photocatalyst for Water Treatment Application. Presented by Dr Xingdong Wang, AUST

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ICWES15 - Preparation of Mesoporous Titania Photocatalyst for Water Treatment Application. Presented by Dr Xingdong Wang, AUST

  1. 1. Preparation of Mesoporous Titania Photocatalyst for Water Treatment Application Xingdong Wang 1 , David R.G.Mitchell 2 , Patrick Hartley 1 and Rachel A. Caruso 1,3 1 CMSE, CSIRO Material Science and Engineering, 2 Australia Center for Microscopy and Microanalysis, The University of Sydney, 3 PFPC, School of Chemistry, The University of Melbourne
  2. 2. My background
  3. 3. Environmental pollution remediation ---principle of photocatalysis <ul><li>High recombination rate of e - /h + pairs (~90%) </li></ul><ul><li>Inactive under visible light (wide band gap---3.2 eV for anatase TiO 2 ) </li></ul>http://www.mchnanosolutions.com/whatis.html
  4. 4. Outline of Porous TiO 2 Project ---Environmental pollution remediation Enhancing photocatalytic (PC) activity <ul><li>UV light: decrease charge recombination (e - /h + ) </li></ul><ul><li>Visible light: narrow TiO 2 band gap </li></ul><ul><li>Crystal properties </li></ul><ul><li>Surface properties </li></ul><ul><li>Porosity </li></ul><ul><li>Band gap </li></ul><ul><li>… </li></ul>X. D. Wang, R. A. Caruso, J. Mater. Chem. 2011, 21 , 20. Control Material properties X. Chen, S. S. Mao, Chem. Rev., 2007, 107 , 2891. <ul><li>Composition </li></ul><ul><li>Crystal phase </li></ul><ul><li>Morphology </li></ul>Preparation of TiO 2
  5. 5. Synthesis of porous TiO 2 materials Composition Composition and Crystal phase Morphology : beads Morphology : fibre X .D. Wang, G.I. N. Waterhouse, D. R. G. Mitchell, K. Prince, R. A. Caruso, submitted X. D. Wang, M. Blackford, K. Prince, R. A. Caruso, submitted X. D. Wang, L. Cao, D.H. Chen, R. A. Caruso, in preparation Ongoing project: collaboration with J. choi, Y. B. Truong, and L.Kyratzis <ul><li>UV light PC increase: Noble metal deposition decrease recombination of e - /h+ </li></ul><ul><li>Crystal phase & Boron doping: band gap </li></ul><ul><li>Noble metal deposition: </li></ul><ul><li>Visible light PC: increased </li></ul>400 nm
  6. 6. TiCl 3 Amorphous TiO 2 Crystallized TiO 2 Synthesis scheme Hydrolysis & condensation NaOH Washing Solvothermal: 160 ° C, 16h NaOH (mol) 0.041 0.054 0.059 0.068 0.070 0.073 0.076 Solution pH 0.25 0.56 0.80 7.92 7.98 9.67 11.58
  7. 7. Surface area
  8. 8. Pore size distribution
  9. 9. Morphology-SEM 0.25 7.98 11.58
  10. 10. Morphology and porosity - T EM 0.25 11.58 7.98
  11. 11. Crystal phase Anatase Rutile Titanate Acid condition: rutile phase Neutral condition: anatase phase (slight brookite) Alkaline condition: titanate phase 8 Å
  12. 12. Surface hydroxyl groups (FT-IR) Ti-OH Ti…H 2 O
  13. 13. Diffuse UV-Vis and band gap
  14. 14. Diffuse UV-vis and Band gap pH 0.25 0.56 7.92 7.98 9.67 11.58 P25 Bg (eV) 3.00 2.98 3.13 3.15 3.25 3.22 3.10
  15. 15. Adsorption test Test conditions: 100 ppm In the dark: shaking overnight (pH 5.10)
  16. 16. <ul><li>Set up: 500 Watt Hg(Xe) lamp with band pass visible light filter (420-650 nm) </li></ul><ul><li>Methylene blue (MB) as a probe molecule </li></ul><ul><li>RSD< 3% </li></ul>Photocatalysis r eaction
  17. 17. Photocatalytic activity Test conditions: 12.5 ppm of MB Visible light: 120 min at pH 5.10 pH
  18. 18. Conclusions <ul><li>Solvothermal treatment produced high surface area TiO 2 . </li></ul><ul><li>The material properties are pH dependant. </li></ul><ul><li>The porous TiO 2 prepared at pH 7.98 showed highest adsorption capacity. </li></ul><ul><li>The maximum photocatalytic activity was for the sample prepared at pH 11.58. </li></ul>
  19. 19. Acknowledgements <ul><li>My supervisor (Dr Rachel Caruso) & group members </li></ul><ul><li>Internal collaborations (Dr Patrick Hartley and Darryl Wells) </li></ul><ul><li>Synchrotron PD teams (Dr Qinfen Gu, Justin Kimpton & Kia Wallwork ) </li></ul><ul><li>Dr Nathan Webster for help with synchrotron data analysis </li></ul>
  20. 20. CSIRO Materials Science and Engineering Dr Xingdong Wang Ph: +61 3 9545 2689 Email: [email_address] Web: www.csiro.au/cmse CSIRO Materials Science and Engineering Dr Rachel Caruso OCE Science leader | Advanced Porous Materials Ph: +61 3 9545 7960 Email: [email_address] Web: www.csiro.au/cmse Thanks for your attention !

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