Hydrothermal synthesis and enhanced photocatalytic activity of flower-like TiO2 on carbon nanotubes
Hydrothermal synthesis and enhanced photocatalytic activity of flower-like TiO2 on carbon nanotubes
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DOI：
10.1016/j.matlet.2012.03.081
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发表时间：
2012-07
影响因子：
3
通讯作者：
Wei Wang;Chunhua Lu;Yaru Ni;Mingxing Su;Zhong-zi Xu
中科院分区：
文献类型：
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作者：
Wei Wang;Chunhua Lu;Yaru Ni;Mingxing Su;Zhong-zi Xu
采用水热法在碳纳米管表面直接生长了尺寸约为1μm的金红石型花状二氧化钛。花状二氧化钛的形核和生长是由生长在碳纳米管表面的锐钛矿型二氧化钛纳米晶引导的。研究发现，被光催化剂完全覆盖的内部碳纳米管不仅增强了光催化剂对光的吸收，减少了光催化剂的电子-空穴复合，而且还防止了与外层二氧化钛的光吸收竞争。值得注意的是，所制备的碳纳米管修饰的花状二氧化钛对有机染料的光催化降解能力优于纯二氧化钛。
Rutile-phase flower-like TiO2, which is made of TiO2rods, with a size of ca. 1μm have been directly grown on the surface of carbon nanotubes by the hydrothermal method. The nucleation and growth of the flower-like TiO2are directed by the anatase-phase TiO2nanocrystals seeded on the carbon nanotubes surface. The inner carbon nanotubes which are fully covered by the photocatalysts are found to not only enhance the light absorption and decrease the electron–hole recombination of the photocatalysts, but also prevent the light absorption contest with the out-layer TiO2. Remarkably, the as-prepared carbon nanotubes modified flower-like TiO2exhibit a superior photocatalytic degradation capacity for organic dyes than pure TiO2.