||A manned spacecraft environmental control and life support system (ECLSS) is a group of systems that allow human to live in space for long term exploration. Generally ECLSS consists of several main components such as, atmosphere revitalizations (CO2 removal/reduction, O2 generation/supply, trace contaminant monitoring and control, microorganism control), water recovery and managements (water storage & distribution, water recovery, water quality monitoring). In this study anatase/rutile/brookite mixed TiO2 nanotubes were prepared and tested for different parts of the ECLSS. In first step photocatalytic oxygen generation using TiO2 nanotubes with IrO2 nanoparticles coated optical fibers will be performed. In second and third step CO2 photoreduction and water purification systems using anatase/rutile/brookite mixed TiO2 nanotubes coated optical fibers will be developed and tested, respectively. In fourth step, air purification systems will be developed. In final step anatase/rutile/brookite mixed TiO2 nanotubes coated optical fibers in cylinder type reactor will be employed to develop anti-contaminant and antibacterial systems.