| Bi2WO6/TiO2纳米管异质结构复合材料的多模式下的光催化活性比较 | |
| Comparison of Photocatalytic Activity of Bi2WO6/TiO2 Nanotubes Heterostructures Composite under Multimode | |
| 摘要: 以TiO2纳米管为模板，采用多组分自组装结合水热法制备Bi2WO6/TiO2纳米管异质结构复合材料。通过多种技术如X射线衍射（XRD），X射线光电子能谱（XPS），N2吸附-脱附，扫描电镜（SEM），高分辨透射电镜（HRTEM）和紫外可见漫反射吸收光谱（UV-Vis DRS）考察所制备样品的组成、结构、形貌、光吸收和电子性质。Bi2WO6纳米片或纳米粒子分布在TiO2纳米管上，形成异质结构。随后，通过在紫外、可见和微波辅助光催化模式下降解染料罗丹明B（RhB）来评价复合催化剂的光催化活性。与TiO2纳米管和Bi2WO6相比，Bi2WO6/TiO2-35纳米管在多模式下表现出更优异的光催化活性。与紫外和可见降解模式相比，Bi2WO6/TiO2-35纳米管在微波辅助光催化模式下对RhB的降解效率最高。这种增强的光催化活性源于适量Bi2WO6的引入、纳米管独特的形貌特征和降解模式所引起的增强的量子效率。降解过程中的活性物种被证明是h+，·OH和·O2-自由基。而且，在微波辅助光催化模式下，可产生更多的·OH和·O2-自由基。 | |
| 关键词: TiO2纳米管 Bi2WO6 多模式降解 光催化 | |
| 基金项目: 国家自然科学基金（No.21376126，81403067）、齐齐哈尔大学青年教师科学技术类科研启动支持计划项目（No.2014K-M03）和黑龙江省教育厅基本业务专项理工面上项目（No.135109204）资助。 | |
| Abstract: Bi2WO6/TiO2 nanotubes (Bi2WO6/TiO2-NTs) heterostructures composite were synthesized by multicom-ponent assembly approach combined with hydrothermal treatment employed TiO2 nanotubes as template. Multiple techniques such as X-ray powder diffraction (XRD), X-ray photo-electron spectroscopy (XPS), N2 adsorption-desorption, scanning electron microscopy (SEM), high resolution transmission electron microscopy (HRTEM), and UV-Vis diffused absorption spectra (UV-Vis DRS) were applied to investigate the composition, structures, morphologies, optical and electronic properties of as-prepared samples. The heterostructures were formed with Bi2WO6 nanoflakes or nanoparticles attached on the surface of TiO2 nanotubes. The photocatalytic activity of Bi2WO6/TiO2-NTs heterostructures was evaluated sufficiently by photodegradation of rhodamine B (RhB) under multimode including UV, visible and microwave-assisted photocatalysis. Compared to TiO2 nanotubes and Bi2WO6, Bi2WO6/TiO2-NTs-35 shows the highest photocatalytic activity under multimode. In contrast with UV, visible mode, the Bi2WO6/TiO2-NTs-35 shows the highest activity toward RhB degradation under microwave-assisted photocatalytic mode. This enhanced photocatalytic activity is due to the more efficient separation of the e--h+ pairs, originating from the introduction of Bi2WO6 modified TiO2-NTs, the nanotubular geometries, and degradation mode. The main active species of the degradation process are proven to be h+, ·OH, and ·O2- radicals. Moreover, more ·OH and ·O2- radicals were generated under microwave-assisted photocatalytic mode. | |
| Keywords: TiO2 nanotubes Bi2WO6 multimode degradation photocatalysis | |
| 投稿时间：2017-04-18 修订日期：2017-07-18 | |
| 摘要点击次数: 1473 | |
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| 马凤延,杨阳,李娜,杨麒麟,李尚锦,申路严.Bi2WO6/TiO2纳米管异质结构复合材料的多模式下的光催化活性比较[J].无机化学学报,2017,33(9):1656-1666. | |
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