Kong Ji-Zhou, Zhai Hai-Fa, Zhang Wei, Wang Shan-Shan, Zhao Xi-Rui, Li Min, Li Hui, Li Ai-Dong, Wu Di
National Laboratory of Solid State Microstructures, Materials Science and Engineering Department, Nanjing University, Nanjing, 210093, China.
Jiangsu Precision and Micro-Manufacturing Technology Laboratory, College of Mechanical and Electrical Engineering, Nanjing University of Aeronautics and Astronautics, Nanjing, 210016, China.
Nanoscale Res Lett. 2017 Sep 6;12(1):526. doi: 10.1186/s11671-017-2297-0.
N-doped ZnO/g-CN composites have been successfully prepared via a facile and cost-effective sol-gel method. The nanocomposites were systematically characterized by XRD, FE-SEM, HRTEM, FT-IR, XPS, and UV-vis DRS. The results indicated that compared with the pure N-doped ZnO, the absorption edge of binary N-doped ZnO/g-CN shifted to a lower energy with increasing the visible-light absorption and improving the charge separation efficiency, which would enhance its photocatalytic activity. Compared with the pure g-CN, ZnO, N-doped ZnO and the composite ZnO/g-CN, the as-prepared N-doped ZnO/g-CN exhibits a greatly enhanced photocatalytic degradation of methylene blue and phenol under visible-light irradiation. Meanwhile, N-doped ZnO/g-CN possesses a high stability. Finally, a proposed mechanism for N-doped ZnO/g-CN is also discussed. The improved photocatalysis can be attributed to the synergistic effect between N-doped ZnO and g-CN, including the energy band structure and enhanced charge separation efficiency.
通过一种简便且经济高效的溶胶 - 凝胶法成功制备了氮掺杂氧化锌/石墨相氮化碳（N-doped ZnO/g-CN）复合材料。采用X射线衍射（XRD）、场发射扫描电子显微镜（FE-SEM）、高分辨率透射电子显微镜（HRTEM）、傅里叶变换红外光谱（FT-IR）、X射线光电子能谱（XPS）和紫外可见漫反射光谱（UV-vis DRS）对该纳米复合材料进行了系统表征。结果表明，与纯氮掺杂氧化锌相比，二元氮掺杂氧化锌/石墨相氮化碳的吸收边随着可见光吸收的增加和电荷分离效率的提高向较低能量方向移动，这将增强其光催化活性。与纯石墨相氮化碳、氧化锌、氮掺杂氧化锌以及氧化锌/石墨相氮化碳复合材料相比，所制备的氮掺杂氧化锌/石墨相氮化碳在可见光照射下对亚甲基蓝和苯酚表现出大大增强的光催化降解性能。同时，氮掺杂氧化锌/石墨相氮化碳具有高稳定性。最后，还讨论了氮掺杂氧化锌/石墨相氮化碳的一种可能机理。光催化性能的提高可归因于氮掺杂氧化锌和石墨相氮化碳之间的协同效应，包括能带结构和增强的电荷分离效率。
