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Completed TRL 3 (started at 2, targeting 3)
The objective for this project was to investigate and develop viable approaches to render the normally UV-activated titanium dioxide (TiO2) catalyst visible light responsive (VLR) and achieve high and sustaining catalytic activity under the visible region of the solar spectrum.
This study was aimed at the further development of visible light responsive catalysts by investigating new methods. A library of catalysts was developed and screened for gas and aqueous phase applications. This project focused on the development of novel photocatalysts, using multiple preparation methods, to be utilized in air and/or water purification reactors. Developed catalyst samples were tested for both applications and underwent vigorous physical characterization.
Top-performing samples were also compared to commercially available visible light responsive (VLR) catalysts. While photocatalysis is a well-developed technology for both air and water purification, most processes use bare titanium dioxide as the catalyst, which requires UV light for activation. By altering the wavelength of light needed for activation, solar radiation or highly-efficient LEDs can be better utilized while eliminating hazardous Hg-containing fluorescent lamps.
Relevance and value to NASA and the Nation from this project is that VLR-catalysts eliminate the hazards associated with UV radiation, enabling the use of long lasting and highly efficient blue or white LEDs, or renewable solar energy. VLR-photocatalysts could facilitate the development of the Photocatalytic Oxidation (PCO) technology for use in International Space Station (ISS) air revitalization and water recovery systems, reducing the overall life cycle costs of such systems, and potentially revolutionizing air and water recovery systems by integrating VLR-PCO into habitat structures (e.g. space wall). Success of the research could also enhance technologies for the indoor air quality control (e.g. managing “sick building syndrome”).
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