CdS空心球的制备及其光催化性能

Synthesis and Photocatalytic Activity of CdS Hollow Nanospheres

以SiO2微球为模板,采用超声辅助法制备CdS空心球;探索了氨水用量对CdS壳层形成的影响,并从CdS壳层形成机制上解释了氨水的影响原因。利用电子能谱(EDX)、X-射线衍射(XRD)、扫描电镜(SEM)、透射电镜(TEM)、荧光光谱(PL)、漫反射紫外可见光谱(DRUVS)测试手段研究了CdS空心球的成份、晶型、形貌及光学性能。结果表明:当氨水添加量为3.0mL时,反应溶液中离子-离子生长机制占主导地位,在该条件下制备了结晶良好的闪锌矿相CdS空心球,微球分散性良好,壳层致密稳定。光催化降解罗丹明B的结果表明,制备的CdS空心球具有优良的可见光催化性能。

This thesis uses ultrasound-driven method and adopts SiO2 microspheres as templates to synthesize CdS hollow spheres. In addition, it investigates the mechanism and the effect of the quantity of ammonia on the formation of CdS shell. Besides, it studies the composition, crystallinity, morphology and optical properties of the CdS hollow spheres by Energy-dispersive X-ray spectra （EDX）, X-ray diffraction （XRD）, scanning electron microscopy （SEM）, transmission electron microscopy （TEM）, UV-vis diffuse reflectance spectrum （DRUVS） and photoluminescent spectra （PL）. The experimental results show that the CdS hollow spheres are well-crystallized zinc blende when the quantity of ammonia is 3.0 mL, and an ion - ion growth mechanism primarily controls the synthesis of CdS. The final obtained CdS hollow spheres are well dispersed and their shells are dense and stable. The authors don＇t observe free CdS particles among the hollow spheres. The photodegradation of Rhodamine B under visible-light shows that the CdS hollow spheres have excellent photocatalytic activity.