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NASA NTRS · 20210019787

Designing a Self-Sterilizing and CO2 Sequestering Surface Coating from an ISRU Perspective

Julia Wood·Sang-hyon Chu·Cheol Park
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Human Space ExplorationSterilizationDisinfectionInflatable HabitatPhotocatalystCO2 sequestrationPhotoreductionTitanium dioxideTiO2Photocatalytic memory

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Julia Wood, Sang-hyon Chu, Cheol Park. Designing a Self-Sterilizing and CO2 Sequestering Surface Coating from an ISRU Perspective. https://ntrs.nasa.gov/citations/20210019787

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Multifunctional Surface Treatment for Self-Sterilization and CO2 Sequestration for Sustainable Space Exploration

A long-term human space presence is dependent on maintaining a safe living environment. Disinfecting surfaces is essential to protecting astronauts from potential pathogens, as well as structural components of the habitat from damaging biofilms. Developing a surface coating that utilizes readily available light has the potential to provide sterilization with additional functionality. Titanium dioxide (TiO2) is a commonly used photocatalyst owing to its efficiency, economic feasibility, and safety to humans. TiO2 photocatalyst modified with other metals such as copper or iron could allow for self-sterilization, photocatalytic memory, and photoreduction of carbon dioxide (CO2) to fuels on Mars. Sustainable design of the photocatalyst should account for the resources available, specifically within the Martian and Lunar regolith. This project reviews the current technologies to design a TiO2 photocatalyst which can be incorporated into a space habitat’s inner lining.

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