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Enhanced TiO2 Photocatalytic Processing of Organic Wastes for Green Space ExplorationThe effect of transition metal co-catalysts on the photocatalytic properties of TiO2 was investigated. Ruthenium (Ru), palladium, platinum, copper, silver, and gold, were loaded onto TiO2 powders (anatase and mixed-phase P25) and screened for the decomposition of rhodamine B (RhB) under broad-band irradiation. The morphology and estimated chemical composition of photocatalysts were determined by scanning electron microscopy and energy dispersive spectroscopy, respectively. Brunhauer, Emmett and Teller (BET) analysis measured mass-specific surface area(s). X-ray diffraction analysis was performed to confirm the identity of titania phase(s) present. The BET surface area of anatase TiO2/Ru 1% (9.2 sq m/gm) was one of the highest measured of all photocatalysts prepared in our laboratory. Photolyses conducted under air-saturated and nitrogen-saturated conditions revealed photodegradation efficiencies of 85 and 2 percent, respectively, after 60 min compared to 58 percent with no catalyst. The cause of low photocatalytic activity under an inert atmosphere is discussed. TiO2/Ru 1% showed a superior photocatalytic activity relative to P25-TiO2 under broad-band irradiation. A potential deployment of photocatalytic technologies on a mission could be a reactor with modest enhancement in solar intensity brought about by a trough-style reactor, with reactants and catalyst flowing along the axis of the trough and therefore being illuminated for a controlled duration based on the flow rate.
Document ID
20130010406
Document Type
Technical Memorandum (TM)
Authors
Udom, I. (University of South Florida Tampa, FL, United States)
Goswami, D. Y. (University of South Florida Tampa, FL, United States)
Ram, M. K. (University of South Florida Tampa, FL, United States)
Stefanakos, E. K. (University of South Florida Tampa, FL, United States)
Heep, A. F. (NASA Glenn Research Center Cleveland, OH, United States)
Kulis, M. J. (NASA Glenn Research Center Cleveland, OH, United States)
McNatt, J. S. (NASA Glenn Research Center Cleveland, OH, United States)
Jaworske, D. A. (NASA Glenn Research Center Cleveland, OH, United States)
Jones, C. A. (NASA Glenn Research Center Cleveland, OH, United States)
Date Acquired
August 27, 2013
Publication Date
February 1, 2013
Subject Category
Chemistry and Materials (General)
Report/Patent Number
NASA/TM-2013-217844
AIAA Paper 2013-0588
E-18620
Meeting Information
51st Aerospace Sciences Meeting(Grapevine, TX)
Funding Number(s)
WBS: WBS 203950.04.02.04
Distribution Limits
Public
Copyright
Public Use Permitted.

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