A Study On The Application Of Nano-Photocatalysis Technique In Indoor Air Cleaners

Nano-TiO₂ photocatalyst can photocatalytically oxidize most of pollutants, especially volatile organic compounds (VOCs) under UV light illumination without second pollution. Much research work on environment improvement has been done. Photocatalytic reactions may take place under room temperature and atmospheric pressure,so they can be applied into the area of new types of heating, ventilation and air condition.This work introduces some of typical photocatalytic reactions, domestic and overseas development position of phocatalysis technologies, the principle of nano-TiO₂ photocatalytic reactions, the influence of the structure and quality of nano-TiO₂ and water vapor on photocatalytic reactions, usual preparation methods of photocatalysts such as gas phase and liquid phase methods and so on, as well as the carriers and methods of nano-TiO₂ photocatalyst loading. The subject is supported by the "Fifteenth National Medical Science & Technology Subjects", which includes two aspects of work: performance testing of nano-TiO₂ coating and that of air cleaners. The effects of nano-TiO₂ photocatalyst were tested on purifying nitrogen dioxide, sulfur dioxide and formaldehyde in 4m3 sealing chamber. In addition, the effects of three types of air cleaners on purifying formaldehyde were also tested in this chamber. We found main technique problems which exist in current air clears field. All of work forms the basis of studying and designing really "photocatalytic" air cleaners and provides experimental data for it.