Elektroforetik depozisyon yöntemiyle nano hibrit fotokatalitik filtre üretimi

Air pollution is one of the most serious problems that threatens human life on the globe. Hundreds of cities suffer from the pollution with exceeded air pollution threshold values. Hence, the pollution is counted to be one of the major reasons behind lung cancer, asthma, cardiovascular dieseases and etc. Not only outdoor air pollution but also the condition in indoor environments is critical since indoor air quality additionally affects quality of human's life and comfort. Time in daily lives, which is spent in indoor environment such as houses, offices, shopping malls and vehicles increases day by day. Particulate matter, dusts, viruses, bacteria, carbon oxides, nitrogen oxides and volatile organic compounds are among the contaminants in the indoor environment. Volatile organic compounds (VOCs) such as ethanol, toluene, benzene are major effective chemical contaminants that people breath. They are emitted from different sources, established buildings, new and renovated buildings, school, new car interiors, carpets, floor coverings, wood-based panel and furniture, solid woods, paints, cleaning products, unflued gas heaters and electric ovens, office equipments. VOCs causes health problems in a short period such as headache, fatigue, tiredness and nausea. In a long period the effect might be more serious than these problems. There are several traditional methods to remove VOCs in indoor air, however these methods are based on adsorption process from gaseous phase to solid phase. This requires frequent cleaning or periodical exchange of the filter, otherwise the adsorbed filters are going to get heavy and require replacement frequently. Photocatalytic oxidation (PCO) is comparatively a novel and promising method for the improvement of indoor air quality since the contaminants can be removed from the indoor and oxidize the water vapour and carbon dioxide (CO2) which are not harmful for human health by using a combination of semiconductor catalysts and light energy. In this study widely used titanium dioxide (TiO2) was selected to produce photocatalytic air filters. Electrophoretic deposition was preferred to immobilize TiO2 nanoparticles over polymeric and metallic substrates. TiO2 as a wideband gap semiconductor was also modified to enhance its PC activity. It is still challenge to produce visible light activated catalysts. For that various configurations, such as silver doped TiO2, silver decorated TiO2 and silver coated TiO2 nanoparticles were produced. Obtained particles were immobilized over metallic meshes via electrophoretic deposition. Finally their performance was evaluated in a custom made UV-LED based PCO reactor. High efficiency particulate arresting (HEPA) type filters are already included in recent indoors but these filters only remove particulates and particles. Consequently, PCO reactors must be developed and mounted in indoor gaseous pollutants. In this thesis, photocatalytic oxidation is capable at NF and metallic meshes based filters was designed and fabricated. As a fast and facile method electrophoretic deposition was used to coat TiO2 on these substrates and their optimization, in the filter usage area use with LED for UV light and highly efficient air filtration system with use the PCO process.