g-C3N4 Photocatalyst based Water Purification System for Crewed Space Missions
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Water recovery from wastewater sources is critical for long-duration space missions. Without an efficient system water recovery on-board, life support system launch weights are practically impossible. Water recovery systems currently used on the international space station (ISS) are complex, involving high temperatures and pressures to recycle water from humidity condensate and urine. The process also uses toxic chemicals to stabilize urine and produce brines as byproducts that need to be safely stored on-board. Therefore, NASA is interested in improving the current water recovery process by reducing complexity, decreasing the number of consumables to carry on-board, improve safety and reliability, and to achieve a higher percentage of water recovery from various water sources including personal bio metabolic products. Extensive research work using nanotechnology has resulted in the demonstration of improved catalytic oxidation, microbial control, anti-fouling, disinfection, water quality monitoring, and removal of trace organic and inorganic contaminants from wastewater. In this paper, the application of g-C3N4-based photocatalyst for the decontamination of organics in water will be presented.