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Title: Preparation, characterization and applications of monolithic titania-silica aerogels
Authors: Cao, Shengli
Issue Date: 2007
Abstract: In this work, new monolithic titania-silica aerogel materials were developed and evaluated. It started with the synthesis using modified sol-gel processes to obtain crack-free monolithic aerogels with high surface area, mesoporosity and titania contents. Influence of various synthesis parameters on aerogel properties was investigated, including modifier, Ti-Si incorporation mode, prehydrolysis, supercritical drying and Ti/Si ratio. The aerogel monoliths were gas permeable, therefore, when air stream flowed through the aerogel matrix, airborne pollutants diffused and were degraded on the internal aerogel surface by photocatalytic oxidation. Titania-silica aerogels exhibited higher photocatalytic activity than Degussa P25. Photocatalytic oxidation of trichloroethylene was investigated in detail using in-situ FTIR technique. Study on indoor air cleaning applications showed the aerogel monoliths effectively captured aerosols and bioaerosols, rapidly killed bacteria spores and were able to degrade VOCs mixture in humid air, indicating a potential candidate of multi-functional air filter materials.
Description: Thesis (Ph.D.)--Hong Kong University of Science and Technology, 2007
xx, 234 leaves : ill. ; 30 cm
HKUST Call Number: Thesis EVNG 2007 Cao
Appears in Collections:IENV Doctoral Theses

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