Photocatalytic activity of macroporous ti o2 p25 films


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التحفيز الضوئي بواسطة أفلام التيتانيوم لتنقية المياه
محاضرة للدكتور حازم فلاح سكيك القاها في المؤتمر الدولي الثاني للعلوم الاساسية والتطبيقة بجامعة الأزهر تتحدث عن تحضير افلام مسامية سميكة من ثاني اكسيد التيتانيوم بطريقة السول جيل لعملية التحفيز الضوئي التي لها تأثير استخدام هام في عملية تنقية الهواء والمياه باستخدام طاقة الضوء ومادة ثاني اكسيد التيتانيوم كمحفز لمزيد من المعلومات

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Photocatalytic activity of macroporous ti o2 p25 films

  1. 1. ‫المؤتمر الدولي الثاني‬ ‫للعلوم األساسية والتطبيقية‬ The Second International Conference on Basic and Applied Sciences Oct 9 – 11, 2012Macro-porous TiO2-P25 composite thick film for photocatalytic applications Institute for Materials & Surface Dr. Hazem Falah Sakeek Technology (IMST) Department of Physics Kiel – Germany Al-Azhar University - Gaza Sponsored by DAAD
  2. 2. The objectives of this research work are: (1) to use sol-gel technique to produce a macro-porous TiO2-P25 composite films. (2) to evaluate the photocatalytic activity of the fabricated TiO2-P25 composite films. Dr. Hazem Falah Sakeek 2
  3. 3. IntroductionEnvironmental contamination, which is growing around theworld or in our daily life, is a serious social problem not to beneglected.Examples of such contamination can be endlessly listed asfollows: — Water pollution caused by industrial and household wastes — Respiratory diseases caused by air pollutants such as SOx or NOx — Room air contamination caused by organic compounds emerging from newly developed building materials Dr. Hazem Falah Sakeek 3
  4. 4. Solution for the Environmental contamination The fact that using energy to eliminate such environmental contamination increases emission of CO2 resulting in more global warming, however, leads us to a dilemma not to use energy to achieve our anti-pollution goal. We need a new method that can gently harmonize the contaminated environment to restore original conditions by using natural energy. One solution to that problem is, Photo-catalyst. Dr. Hazem Falah Sakeek 4
  5. 5. What is a photo-catalysts? Catalyst is a substance that makes a chemical reaction more likely to happen by reducing the activation energy needed to start it. A catalyst speed up a chemical reaction or make it happen at a lower temperature. Once the reaction has finished, the catalyst isnt used up. Photocatalysis means light is involved in making a catalyst do its job. In other words, light provides the energy that allows the catalyst to work. Dr. Hazem Falah Sakeek 5
  6. 6. Dr. Hazem Falah Sakeek 6
  7. 7. The function of the photo-catalyst are: Anti- Purifying bacteria water Preventing Deodorizing contamination (Sterilization) Purifying the air (dissolving NOx) Dr. Hazem Falah Sakeek 8
  8. 8. Thin-film PhotocatalystIn order to use TiO2 as an effective photocatalyst for theabove mentioned applications, powder is not an appropriateform, because it may be blown off by wind or washed out bywater, and when used to purify water, it has to be separatedfrom the water. Thus, a method to fix the powder is required. Dr. Hazem Falah Sakeek 10
  9. 9. Film PreperationMaterial Used Method Titanium (IV) Isopropoxide,  Films prepared by spin-coating at 3000rpm for 20s on a glass Diethanolamine (DEA) as a substrate. And annealed at 400oC stabilizing agent, for 10min. Nanocrystalline TiO2 Titanium Powder P25, used as filler Acetyl acetone, Ethanol, Polyethylene glycol (PEG 400) used as a surfactant. Dr. Hazem Falah Sakeek 11
  10. 10. Characterization XRD SEM Optical Properties Measurements for the films UV-Visible Absorption of MO for Photocatalyst activity. Dr. Hazem Falah Sakeek 12
  11. 11. XRD Spectra for TiO2, P25 Thin films XRD patterns of TiO2-P25 composite films calcinated at 400oCDr. Hazem Falah Sakeek 13
  12. 12. Without using PEG10%w PEGNumerous random macropores are formed through the nanoscale TiO2 particles Dr. Hazem Falah Sakeek 14
  13. 13. Photocatalysis Measurements Visual degradation of the MO dye 15
  14. 14. UV-VIS Absorption Spectra of MO Absorption spectra of MO dye sol illuminated by UV radiation in contact with TiO2-P25 films as a function of timeDr. Hazem Falah Sakeek 16
  15. 15. Photocatalytic activity for TiO2-P25 Film A Ln  kt AoVariation of Ln(A/Ao) of MO dye solution in contact with TiO2-P25 composite film as a function of illumination period at wavelength of 463nm. Dr. Hazem Falah Sakeek 17
  16. 16. Conclusion Macroporous TiO2-P25 composite films have been successfully Fabricated on glass substrate by spin-coating techniques free of cracks and agglomeration. The photocatalytic behavior of the films have been investigated.Future Work Optimize the P25 loading and study its effect on the photocatalyst. Study the effect of the film structure (porous size) on the photocatalyst. Modifying the Film with Noble metals such as Ag, Au, Pt. to extend the Photocatalyst in the visible region of the spectrum. Dr. Hazem Falah Sakeek 18