Liu Gang, Chen Zhigang, Dong Chunlei, Zhao Yanning, Li Feng, Lu Gao Qing, Cheng Hui-Ming
Shenyang National Laboratory for Materials Science, Institute of Metal Research, Chinese Academy of Sciences, 72 Wenhua Road, Shenyang 110016, China.
J Phys Chem B. 2006 Oct 26;110(42):20823-8. doi: 10.1021/jp062946m.
Iodine-doped (I-doped) mesoporous titania with a bicrystalline (anatase and rutile) framework was synthesized by a two-step template hydrothermal synthesis route. I-doped titania with anatase structure was also synthesized without the use of a block copolymer as a template. The resultant titania samples were characterized by X-ray diffraction, Raman spectroscopy, Fourier transform infrared, nitrogen adsorption, transmission electron microscopy, X-ray photoelectron spectroscopy, and UV-visible absorption spectroscopy. Both I-doped titania samples, with and without template, show much better photocatalytic activity than commercial P25 titania in the photodegradation of methylene blue under the irradiation of visible light (>420 nm) and UV-visible light. Furthermore, I-doped mesoporous titania with a bicrystalline framework exhibits better activity than I-doped titania with anatase structure. The effect of rutile phase in titania on the adsorptive capacity of water and surface hydroxyl, and photocatalytic activity was investigated in detail. The excellent performance of I-doped mesoporous titania under both visible light and UV-visible light can be attributed to the combined effects of bicrystalline framework, high crystallinity, large surface area, mesoporous structure, and high visible light absorption induced by I-doping.
通过两步模板水热合成路线合成了具有双晶（锐钛矿和金红石）骨架的碘掺杂介孔二氧化钛。还在不使用嵌段共聚物作为模板的情况下合成了具有锐钛矿结构的碘掺杂二氧化钛。通过X射线衍射、拉曼光谱、傅里叶变换红外光谱、氮吸附、透射电子显微镜、X射线光电子能谱和紫外-可见吸收光谱对所得二氧化钛样品进行了表征。在可见光（>420 nm）和紫外-可见光照射下，有模板和无模板的碘掺杂二氧化钛样品在亚甲基蓝的光降解中均表现出比商业P25二氧化钛更好的光催化活性。此外，具有双晶骨架的碘掺杂介孔二氧化钛比具有锐钛矿结构的碘掺杂二氧化钛表现出更好的活性。详细研究了二氧化钛中金红石相对水的吸附容量、表面羟基和光催化活性的影响。碘掺杂介孔二氧化钛在可见光和紫外-可见光下的优异性能可归因于双晶骨架、高结晶度、大表面积、介孔结构以及碘掺杂引起的高可见光吸收的综合作用。
