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Photocatalytic Degradation of Dyes using TiO2

Photocatalytic Degradation of Dyes using TiO2. Engr 45. Fall 2010 By: Melody Golobic Alexandra Majoulet Carolina Aranda. Introduction. Objective: To show that TiO2 with the help of UV light is able to break down organic compounds (waste water).

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Photocatalytic Degradation of Dyes using TiO2

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  1. Photocatalytic Degradation of Dyes using TiO2 Engr 45. Fall 2010 By: Melody Golobic Alexandra Majoulet Carolina Aranda

  2. Introduction Objective: To show that TiO2 with the help of UV light is able to break down organic compounds (waste water).

  3. You will find Ti02 in all kinds of paint, printing ink, plastics, paper, synthetic fibers, rubber, condensers, painting colors and crayons, ceramics, electronic components along with food and cosmetics. Ti02 Background

  4. Background • When the light hits the TiO2 molecule, an electron gets excited, comes off and creates a free radical with the oxygen in the water which then destroys the congo red.

  5. Our Experiment • Our experiment consisted on adding 0.0147g of Congo Red dye to 550mL of dionized water to simulate waste water. Then, we added 0.5558g of TiO2 and put the beaker with the solution on a stirring plate. A 23W light bulb and a second beaker was carefully placed inside the solution to activate the TiO2. Every 20 minutes we took a sample of the solution and centrifuged it three times to separate the TiO2 from the rest of the solution. Next, we measured the absorbance of light in logger pro and watched the concentration of the dye diminished over time.

  6. Materials and Instruments

  7. Our Experiment

  8. Logger Pro Data

  9. Results Samples over the course of 3 hours.

  10. Results A = εbC

  11. TiO2 Degrading Methylene Blue

  12. Conclusion From this experiment, we can conclude that the TiO2 did in fact degrade over time both of the dyes with the help of UV light. Even though the blue dye reacted differently with TiO2, we still believe that if this experiment was done over a longer period of time that the concentration of the dyes would have been zero.

  13. Applications • Self Cleaning: Windows, mirrors, tiles and other surfaces.

  14. References Karen Frindell, Chemistry Instructor at the Santa Rosa Junior College Photocatalysis Applications of Titanium Dioxide Ti02. 2003. 4th of December, 2010. <http://www.titaniumart.com/photocatalysis-ti02.html> Product, By. "Self-Cleaning Glass - China Self-cleaning Glass, Building Glass, Curtain Wall Glass in Building Glass." Made-in-China.com China Manufacturer Directory, China Products, China Suppliers, China Trade, China Factory. Web. 06 Dec. 2010. <http://www.made-in-china.com/showroom/bjltglass/product-detailyqXxiIFACfro/China-Self-Cleaning-Glass.html>. Tricker and Andrzejewski. Remediation of Water Contaminated with an Azo Dye. Journal of Chemical Education. Vol.76. December 1999 "The Electron Air Purifier." Air Purifier and Sterilizer - Electron Lifestyle Products. Web. 06 Dec. 2010. <http://www.electronline.com.au/faq_sterilizers_purifiers.htm>.

  15. ACKNOWLEDGMENT The presenters would like to thank Karen Frindell, Chemistry Instructor at the Santa Rosa Junior College, and the Chemistry department for the help, guidance, support, and for providing the materials needed.

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