Department of Materials Science, School of Physical Science and Technology, Lanzhou University, Lanzhou, 730000, China.
Nanoscale. 2013 Oct 21;5(20):9739-46. doi: 10.1039/c3nr03024e.
Anatase/rutile mixed titania nanotubes (TiO2 NTs) precipitated with gold nanoparticles (Au NPs), i.e. Au/TiO2, have been synthesized and investigated on visible photocatalysis properties. A deposition-precipitation (DP) method was adopted to reduce the gold precursor to Au NPs within the preformed TiO2 NTs by the emulsion electrospinning technique. The optimal visible photocatalytic activity was found in the sample Au3(DP350)/TiO2 with a loading of 3 wt% Au NPs and calcining at 350 °C. Through transmission electron microscopy, Au NPs of 4.16 nm diameter were observed at the interface between the anatase and rutile phases in the optimal Au3(DP350)/TiO2 sample, and these joint active sites at the interface were beneficial for charge separation. The obtained optimal photocatalytic efficiency of Au3(DP350)/TiO2 was ascribed to the synergistic effect of the enhanced visible absorption and the anatase/rutile mixed-phase composition, and the possible mechanism for this was discussed in detail.
金纳米颗粒（Au NPs）负载的锐钛矿/金红石混合二氧化钛纳米管（TiO2 NTs），即 Au/TiO2，已经被合成并研究了其可见光光催化性能。采用沉积沉淀（DP）法，通过乳液静电纺丝技术，在预先形成的 TiO2 NTs 内将金前驱体还原为 Au NPs。在负载 3wt%Au NPs、煅烧温度为 350°C 的 Au3(DP350)/TiO2 样品中，观察到了最佳的可见光光催化活性。通过透射电子显微镜观察，在最佳的 Au3(DP350)/TiO2 样品中，在锐钛矿和金红石相的界面处观察到了直径为 4.16nm 的 Au NPs，这些界面上的联合活性位点有利于电荷分离。Au3(DP350)/TiO2 获得的最佳光催化效率归因于增强的可见光吸收和锐钛矿/金红石混合相组成的协同效应，并详细讨论了可能的机制。
