Large-Sized TiO₂/SiO₂ Macroporous Materials for Photo-Degradation of Organic Compounds in Water and Air

Abstract:

Large-sized macroporous TiO₂/SiO₂ catalysts were prepared via filling a novel SiO₂ support with a solution of tetrabutyl titanate in cyclohexane, undergoing subsequent in situ hydrolysis and final calcination to 600 °C. The loaded nano-particles of TiO₂ were uniformly dispersed on the nano-layer of SiO₂ support, the interaction of TiO₂ and SiO₂ was strengthened through the formation of Si-O-Ti bonds. Methyl orange was introduced in the macroporous catalyst as a target compound to investigate the photo-degradation of the loaded nano-TiO₂. Under radiation of 365 nm UV light the highest degradation rate constant of 1.78/h was observed from the as-prepared catalyst containing 54.5 wt.% of TiO₂. Formaldehyde and xylene in gas states can be captured and photo-degraded by the catalyst that was placed in a self-designed air-circulation device equipped with UV lights and electric fans. The high effectiveness of the catalysts in the cleaning of the indoor air should be owing to its special macroporous structure and the long-term photo-catalytic activity of loaded nano-TiO₂.

• Periodical: Advanced Materials Research (Volumes 306-307)
• Pages: 1157-1161
• DOI: https://doi.org/10.4028/www.scientific.net/AMR.306-307.1157
• Online since: August 2011
• Authors: Rui Feng Zhang, Jian Ye, Neng Bing Long
• Keywords: Air Cleaning, Large Size, Nano-TiO₂, Photocatalytic Degradation, SiO₂ Support

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