Coverage of carbon nanotubes with titania nanoparticles for the preparation of active titania-based photocatalysts
Coverage of carbon nanotubes with titania nanoparticles for the preparation of active titania-based photocatalysts
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DOI：
10.1016/j.apcatb.2012.06.013
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发表时间：
2012-08
影响因子：
22.1
通讯作者：
S. Takenaka;Takafumi Arike;H. Matsune;M. Kishida
中科院分区：
文献类型：
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作者：
S. Takenaka;Takafumi Arike;H. Matsune;M. Kishida
为了提高碳纳米管的光催化活性，在碳纳米管上沉积了纳米二氧化钛。在尿素或甘氨酰胺存在下，利用四异丙氧钛(Ti(OIPR)4)的水解液，可以在碳纳米管的外表面均匀地覆盖一层纳米二氧化钛。尿素和甘氨酰胺作为二氧化钛纳米颗粒和碳纳米管表面之间的连接物。包覆了二氧化钛的碳纳米管对有机分子的光降解表现出比单独的二氧化钛更高的催化活性。在TiO2光催化体系中加入碳纳米管可以延缓TiO2光催化体系中电子-空穴对的复合。当铂金属颗粒被插入到纳米碳管的空腔中时，可以进一步提高其光催化活性。载铂碳纳米管在光催化降解水中有机污染物方面表现出独特的催化性能。
TiO2nanoparticles were deposited on carbon nanotubes (CNTs) to improve their photocatalytic activity. The outer surface of the CNTs could be uniformly covered with TiO2nanoparticles using the hydrolysis of titanium tetraisopropoxide (Ti(OiPr)4) in the presence of urea or glycine amide. The urea and glycine amide acted as linker molecules between the TiO2nanoparticles and the CNT surfaces. The TiO2-coated CNTs showed a higher catalytic activity for the photodegradation of organic molecules than TiO2alone. The addition of the CNTs to the TiO2photocatalytic system retarded the recombination of the electron–hole pairs generated in the photo-irradiated TiO2. When Pt metal particles were inserted in the cavities of the CNTs in the TiO2-coated CNT catalyst system, further improvements in the photocatalytic activity were observed. The TiO2-coated CNTs with Pt metal particles displayed a unique catalytic performance in the photocatalytic degradation of organic impurities in water.