improving photocatalyst performance for water purification through surface modifications
DESCRIPTION
Improving photocatalyst performance for water purification through surface modifications. Katherine, Amanda Mather, Dr. Paul Tratnyek August 20, 2010. Environmental and Biomolecular Systems Oregon Health & Science University Beaverton, OR 97006-8921 USA http://ebs.ogi.edu. The Shield 500. - PowerPoint PPT PresentationTRANSCRIPT
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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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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