CeO_2-CdS/埃洛石纳米管的制备及可见光催化性能

Preparation of CeO_2-CdS/Halloysite Nanotubes Composite and Its Visible Light Photocatalytic Performance

采用微波辐射法制备埃洛石纳米管(HNTs)负载CeO_2-CdS复合材料CeO_2-CdS/HNTs。用X射线衍射、透射电子显微镜、紫外-可见漫反射光谱、Fourier变换红外光谱等对CeO_2-CdS/HNTs样品结构和形貌进行表征,考察了可见光下降解亚甲基蓝的光催化活性,讨论了CeO_2/CdS摩尔比对光催化剂活性的影响。结果表明:纳米颗粒CeO_2、CdS以紧密结合的形式牢固的负载在HNTs表面,二者具有协同催化作用。当CeO_2/CdS摩尔比为3:7时,80 min内亚甲基蓝的降解率可达95%。

CeO_2-CdS/halloysites nanotubes(HNTs) with HNTs-supported hybrid CeO_2 and CdS were synthesized by a microwave radiation method.The photocatalyst CeO_2CdS/HNTs as-prepared was characterized by X-ray diffraction,transmission electron microscopy,ultraviolet-visible diffuse reflectance and Fourier-transform infrared spectroscopy,respectively.The photocatalytic activity of the CeO_2CdS/HNTs sample was evaluated via the degradation of methylene blue(MB) under visible-light irradiation.The influence of molar ratios of CeO_2 to CdS was investigated.It is indicated that the CeO_2 and CdS nanoparticles can be loaded on the surface of HNTs evenly,demonstrating a synergistic effect on the photocatalytic performance.The maximum degradation rate of MB is 95%at the molar ratio of CeO_2 to CdS of 3:7.