纳米复合材料CdS/TiO_2NTs的制备及光催化产氢活性(英文)

Preparation of CdS/TiO_2NTs Nanocomposite and Its Activity of Photocatalytic Hydrogen Production

通过离子交换和沉淀反应制备纳米复合材料CdS/TiO2NTs。采用X射线衍射(XRD)、扫描电镜(SEM)、透射电镜(TEM)、漫反射紫外-可见吸收光谱(DRUVAS)、荧光光谱(FES)、X射线荧光分析(XRF)等手段对该复合材料的结构进行表征。SEM结果表明:钛酸盐纳米管的形成经由TiO2颗粒-片状的钛酸盐-卷曲的钛酸盐纳米管的自组装过程。XRD、DRUVAS、FES和FES结果表明:平均粒度大约8nm的六方相CdS均匀的负载于锐钛矿型TiO2纳米管表面,其吸收边扩展到可见区。与TiO2纳米管及TiO2粉末相比,CdS/TiO2NTs纳米复合材料展示了较高的可见光催化分解水产氢活性。

The CdS/TiO2NTs nanocomposite was prepared through ion-exchange and precipitation reactions. The nanostructure properties of the composites were characterized by X-ray diffraction （XRD）, scanning electron microscopy （SEM）, transmission electron microscopy （TEM）, diffuse reflectance UV-visible absorption spectra （DRUVAS）, fluorescence emission spectra （FES） and X-ray fluorescence analyzer （XRF）. SEM results revealed that the lamellar sodium trititanate originating from the TiO2 particles individually curled to form the sodium trititanate nanotubes by self-assembled mechanism. The results of XRD, TEM and DRUVAS demonstrated that hexagonal phase CdS with about 8 nm particle size were homogeneously loaded on the surface of anatase TiO2NTs and the absorption edge of the composite was extended to the visible region. The CdS/TiO2NTs composite exhibited the highest activity of hydrogen production （1708 μL/g） by photocatalytic water decomposition in comparison with TiOENTs and TiO2 powder under visible light irradiation （2 〉 400 nm） for 6 h.