Synthesis of TiO2-Activated carbon powders by sol-gel method and study of the photocatalytic activity

• Main Authors: Pei-Jung Lin, 林佩蓉
• Other Authors: Chi-Yen Huang
• Format: Others
• Language: zh-TW
• Published: 2007
• Online Access: http://ndltd.ncl.edu.tw/handle/91877052465943074008

碩士 === 國立成功大學 === 資源工程學系碩博士班 === 95 === TiO2 photocatalysts has attracted a great deal of attention with the increasing number of recent environmental problems in the world, especially for the detoxification of water and air. TiO2 must overcome the faults related to the low surface area of TiO2, it could be solven by modifying TiO2 on activated carbon surface. In this study, activated carbon is regarded as substrate, and TiO2 sols was loaded on it, which was prepared by sol-gel method using tetraisopropyl titanate as precursor to mount thin TiO2 film on activated carbon by heterogeneous growth. The TiO2-mounted activated carbon powder is characterizes by XRD、SEM for assuming that activated carbon is regarded as substrate and TiO2 is dispersed on it, and prove that have Ti-O-C chemical bonding by TEM、FTIR. The powder was employed as catalysts for photocatalytic test that was conducted on methylene blue,CO2 and bacteria reduction. The composite powder is observed by TEM that the crystallite size of TiO2 is smaller than bare TiO2(15nm and 24nm in 600℃) and this result is also proved by XRD calculation. Furthermore, The composite powder was shown higher photoactivity for the three photocatalytic test under UV irradiation. Compared to bare TiO2 prepared in parallel,it is attributed to the activated carbon large surface area and TiO2 dispersed on it as well as diminish anatase crystallite size.