Improving photocatalyst performance for water purification through surface modifications
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Transcript of Improving photocatalyst performance for water purification through surface modifications
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1
Improving photocatalyst performance for water purification
through surface modifications
Katherine, Amanda Mather, Dr. Paul TratnyekAugust 20, 2010
Environmental and Biomolecular Systems
Oregon Health & Science University
Beaverton, OR 97006-8921 USA
http://ebs.ogi.edu
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2The Shield 500
• Puralytics’ water purification device: “The Shield”• Grant from ONAMI
Source: The Oregonian
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3The Shield 500: How it works
• Glass mesh• Titanium dioxide
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4The Shield 500: How it works
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5The Shield 500: How to Improve it
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6Surface modifications
• Surface modifications may: – Change the selectivity or yield of contaminants– Increase range of wavelength response– Increase efficiency by inhibiting recombination
• Surface modifications tested: – Platinum– Silver– Gold– Palladium
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7Experimental Procedures: Applying modification
• Photodeposition – 40 mL vials– Piece of TiO2 mesh (bare
or previously modified)– Metal reagent solution of
varying concentrations– Methanol as electron
donor– Solar simulator for 20
min.– Wash and dry pieces
while inside bottles
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8Experimental Procedures: Testing modification
• Modifications to be tested by: – Same 40 mL vials as deposition– Piece of TiO2 mesh (bare or
previously modified)– Caffeine as model contaminant– Degraded under solar simulator– UV-Vis absorbance used for
analysis of degradation
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9Results: Caffeine Degradation
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10Results: Optimum Loading
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11Conclusions
Platinum surface modification, while using H2PtCl6 as a reagent solution, provides the largest improvement in photocatalyst performance and should be tested in The Shield 500 reactor.
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12Acknowledgements
Thank you to Amanda Mather, Dr. Paul Tratnyek, CMOP, and Saturday Academy’s Apprenticeships in
Science and Engineering.
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13
Supplemental Slides
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14Experimental Procedures: Applying modification
• Gold deposited TiO2 of various loadings
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15Caffeine
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16Solar Bag