Department of Chemistry, Faculty of Science, University of Mohaghegh Ardabili, P.O. Box 179, Ardabil, Iran.
Department of Chemistry, Faculty of Science, University of Mohaghegh Ardabili, P.O. Box 179, Ardabil, Iran.
J Colloid Interface Sci. 2016 Nov 15;482:165-174. doi: 10.1016/j.jcis.2016.08.002. Epub 2016 Aug 2.
Graphite carbon nitride (g-C3N4)/Ag2SO4 nanocomposites, as highly enhanced visible-light-driven photocatalysts, were prepared by a fast microwave-assisted method. The resulting g-C3N4/Ag2SO4 nanocomposites were characterized by X-ray diffraction, energy dispersive analysis of X-rays, scanning electron microscopy, transmission electron microscopy, thermogravimetric analysis, Fourier transform-infrared spectroscopy, and ultraviolet-visible diffuse reflectance spectroscopy techniques. Moreover, charge separation efficiency was studied by photoluminescence measurements. Photocatalytic activity of the g-C3N4/Ag2SO4 (40%) nanocomposite in degradation of rhodamine B, methylene blue, and fuchsine is about 6, 3.8, and 3.3-folds greater than that of the g-C3N4 under visible-light illumination. Effect of microwave irradiation time, calcination temperature, and scavengers of the reactive species on the degradation reaction was also evaluated. The enhanced photocatalytic activity was mainly ascribed to the matching band energies of g-C3N4 and Ag2SO4 which leads to an improved separation of photogenerated electron-hole pairs. Finally, the optimized nanocomposite was recycled for five times without remarkable decrease of the photocatalytic activity.
石墨相氮化碳（g-C3N4）/Ag2SO4 纳米复合材料作为高效可见光驱动光催化剂，通过快速微波辅助法制备。所得 g-C3N4/Ag2SO4 纳米复合材料通过 X 射线衍射、X 射线能谱分析、扫描电子显微镜、透射电子显微镜、热重分析、傅里叶变换红外光谱和紫外可见漫反射光谱技术进行了表征。此外，通过光致发光测量研究了电荷分离效率。在可见光照射下，g-C3N4/Ag2SO4（40%）纳米复合材料在罗丹明 B、亚甲基蓝和碱性品红降解中的光催化活性分别约为 g-C3N4 的 6、3.8 和 3.3 倍。还评估了微波辐照时间、煅烧温度和反应物种清除剂对降解反应的影响。增强的光催化活性主要归因于 g-C3N4 和 Ag2SO4 的能带能量匹配，这导致光生电子-空穴对的分离得到改善。最后，优化的纳米复合材料在五次回收循环中没有明显降低光催化活性。
