Yu Hong-Bin, Rong Zi-Jia, Lu Ying, Wang Xin-Hong, Luo Xu-Biao
Key Laboratory of Jiangxi Province for Persistent Pollutants Control and Resources Recycle, Nanchang Hangkong University, Nanchang 330063, China.
School of Environment, Engineering Lab for Water Pollution Control and Resources Recovery, Northeast Normal University, Changchun 130117, China.
J Nanosci Nanotechnol. 2018 Aug 1;18(8):5794-5798. doi: 10.1166/jnn.2018.15395.
To improve the efficiency of photocatalysts, a composite of CeO2-quantum dots/Cu2O (CeO2-QDs/Cu2O) was prepared through a one-step hydrothermal procedure in alkaline carbonate solution with Cu2(OH)2CO3 and Ce(NO3)3. 6H2O as precursors and glucose as reducing agent. The morphologies and structures of the prepared photocatalysts were well characterized utilizing Transmission Electron Microscopy (TEM), X-ray Diffractometry (XRD), X-ray Photoelectron Spectroscopy (XPS) and UV-Vis Diffuse Reflectance Spectrophotometer (DRS). The results indicated that the CeO2-QDs with 5 to 10 nm diameters were well dispersed and had a good contact with Cu2O. As observed in the photocatalytic experiments, Rhodamine B could be degraded more effectively under simulated sunlight using CeO2-QDs/Cu2O as the photocatalysts. Also, the obtained photocatalytic kinetics constant was higher than that in the experiments using CeO2 or Cu2O nano particles as photocatalysts. The enhanced photocatalytic activities might be attributed to the efficient separation of photo-generated charge carriers with the help of the p-n heterojunction and the morphology of quantum dots.
为提高光催化剂的效率，以碱式碳酸铜（Cu2(OH)2CO3）和硝酸铈（Ce(NO3)3·6H2O）为前驱体，葡萄糖为还原剂，通过一步水热法在碱性碳酸盐溶液中制备了CeO2量子点/Cu2O（CeO2-QDs/Cu2O）复合材料。利用透射电子显微镜（TEM）、X射线衍射仪（XRD）、X射线光电子能谱（XPS）和紫外可见漫反射分光光度计（DRS）对所制备的光催化剂的形貌和结构进行了充分表征。结果表明，直径为5至10nm的CeO2量子点分散良好，与Cu2O有良好的接触。在光催化实验中观察到，以CeO2-QDs/Cu2O为光催化剂，在模拟太阳光下罗丹明B能更有效地降解。此外，所获得的光催化动力学常数高于以CeO2或Cu2O纳米颗粒为光催化剂的实验中的常数。光催化活性的增强可能归因于在p-n异质结的帮助下光生电荷载流子的有效分离以及量子点的形貌。
