Integrated Photocatalytic Filtration Array for Indoor Air Quality Control

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• 作者：Frans Denny ; Eric Permana ; Jason Scott ; Jing Wang ; David Y. H. Pui ; Rose Amal
• 刊名：Environmental Science & Technology
• 出版年：2010
• 出版时间：July 15, 2010
• 年：2010
• 卷：44
• 期：14
• 页码：5558-5563
• 全文大小：215K
• 年卷期：v.44,no.14(July 15, 2010)
• ISSN：1520-5851

文摘

Photocatalytic and filtration technologies were integrated to develop a hybrid system capable of removing and oxidizing organic pollutants from an air stream. A fluidized bed aerosol generator (FBAG) was adapted to prepare TiO₂-loaded ventilation filters for the photodegradation of gas phase ethanol. Compared to a manually loaded filter, the ethanol photodegradation rate constant for the FBAG coated filter increased by 361%. Additionally, the presence of the photogenerated intermediate product, acetaldehyde, was reduced and the time for mineralization to CO₂ was accelerated. These improvements were attributed to the FBAG system providing a more uniform distribution of TiO₂ particles across the filter surface leading to greater accessibility by the UV light. A dual-UV-lamp system, as opposed to a single-lamp system, enhanced photocatalytic filter performance demonstrating the importance of high light irradiance and light distribution across the filter surface. Substituting the blacklight blue lamps with a UV-light-emitting-diode (UV-LED) array led to further improvement as well as suppressed the electrical energy per order (EE/O) by a factor of 6. These improvements derived from the more uniform distribution of light irradiance as well as the higher efficiency of UV-LEDs in converting electrical energy to photons.