Synthesis of Carbon Nanotube-Anatase TiO2 Sub-micrometer-sized Sphere Composite Photocatalyst for Synergistic Degradation of Gaseous Styrene
Synthesis of Carbon Nanotube-Anatase TiO2 Sub-micrometer-sized Sphere Composite Photocatalyst for Synergistic Degradation of Gaseous Styrene
复制标题
碳纳米管-锐钛矿型TiO2亚微米球复合光催化剂的合成用于协同降解气态苯乙烯
DOI：
10.1021/am3016476
复制
发表时间：
2012-11-01
影响因子：
9.5
通讯作者：
Zhao, Huijun
中科院分区：
文献类型：
--
作者：
An, Taicheng;Chen, Jiangyao;Zhao, Huijun
以四氟化钛为钛源，碳纳米管为结构调节剂，采用一步水热法制备了碳纳米管（CNT）-亚微米级TiO 2微球复合光催化剂。采用X射线衍射、紫外-可见吸收光谱、N2吸附-脱附、扫描电镜和透射电镜等技术对复合光催化剂的结构和性能进行了表征。结果表明，复合光催化剂由纳米碳管包裹在具有可控晶面的亚微米级TiO 2微球上构成，纳米碳管颗粒的平均粒径为200 ~ 600 nm。将制备的复合光催化剂用于降解气态苯乙烯。正如预期的那样，协同效应，显着提高光催化降解效率的气相苯乙烯的制备复合光催化剂的降解效率进行了观察相比，使用纯纳米TiO 2和碳纳米管的吸附的降解效率。在液体甲基橙子的脱色中也证实了类似的结果。进一步的研究表明，复合光催化剂的协同效应与纳米TiO 2微球的结构和CNTs在复合光催化剂中的重要作用有关。通过控制水热合成过程中CNTs的含量、TiO 2的含量或温度，可以得到晶粒尺寸可控、{001}、{101}晶面或多晶面为主的纳米TiO 2球，有利于提高协同效应，进一步提高光催化效率。
The carbon nanotube (CNT)-sub-micrometer-sized anatase TiO2 sphere composite photocatalysts were synthesized by a facile one-step hydrothermal method using titanium tetrafluoride as titanium source and CNTs as structure regulator. Various technologies including X-ray diffraction, UV-visible absorption spectra, N-2 adsorption-desorption, scanning electron microscopy, and transmission electron microscopy were employed to characterize the structure properties of the prepared composite photocatalysts. The results indicated that the composite photocatalysts consisted of CNTs wrapping around the sub-micrometer-sized anatase TiO2 spheres with controllable crystal facets and that the aggregated particles with average diameter ranged from 200 to 600 nm. The fabricated composite photocatalysts were used to degrade gaseous styrene in this work. As expected, a synergistic effect that remarkably enhancing the photocatalytic degradation efficiency of gaseous styrene by the prepared composite photocatalysts was observed in comparison with that the degradation efficiency using pure anatase TiO2 and the adsorption of CNTs. Similar results were also confirmed in the decolorization of liquid methyl orange. Further investigation demonstrated that the synergistic effect in the photocatalytic activity was related to the structure of the sub-micrometer-sized anatase TiO2 spheres and the significant roles of CNTs in the composite photocatalysts. By controlling the content of CNTs, the content of TiO2 or the temperature during the hydrothermal synthesis process, anatase TiO2 spheres with controllable crystallite size and dominant crystal facets such as {001}, {101}, or polycrystalline could be obtained, which was beneficial for the increase in the synergistic effect and further enhancement of the photocatalytic efficiencies.