State Key Laboratory of Electroanalytical Chemistry, Changchun Institute of Applied Chemistry, Chinese Academy of Science , Changchun, Jilin 130022, P. R. China.
ACS Appl Mater Interfaces. 2013 Dec 11;5(23):12533-40. doi: 10.1021/am4038307. Epub 2013 Nov 19.
Highly efficient visible-light-driven g-C3N4/Ag2O heterostructured photocatalysts were prepared by a simple liquid phase synthesis method at room temperature. The composition, structure, morphology, and optical absorption properties of the as-prepared g-C3N4/Ag2O composites were characterized by XRD, FTIR, XPS, TEM, and UV-vis DRS, respectively. We found interestingly that the photogenerated charge carriers separations of the as-prepared g-C3N4/Ag2O composites were closely related to the mass ratio of g-C3N4 and Ag2O. When the mass ratio of g-C3N4 and Ag2O reached 1:4, the as-prepared composite exhibited the highest photocatalytic activity, which was almost 11 and 1.2 times as high as that of individual g-C3N4 and Ag2O, respectively. The enhancement of photocatalytic activity could be attributed to the synergetic effects between g-C3N4 and Ag2O as well as the improved dispersibility and the decreased particle size of Ag2O. Moreover, the as-prepared composites showed excellent stability toward the photodegradation of methyl orange (MO). Finally, a possible photocatalytic and charge separation mechanism was proposed.
采用室温下的简单液相合成法制备了高效可见光驱动的 g-C3N4/Ag2O 异质结构光催化剂。通过 XRD、FTIR、XPS、TEM 和 UV-vis DRS 分别对所制备的 g-C3N4/Ag2O 复合材料的组成、结构、形貌和光学吸收性能进行了表征。我们有趣地发现，所制备的 g-C3N4/Ag2O 复合材料的光生载流子分离与 g-C3N4 和 Ag2O 的质量比密切相关。当 g-C3N4 和 Ag2O 的质量比达到 1:4 时，所制备的复合材料表现出最高的光催化活性，分别是单独的 g-C3N4 和 Ag2O 的 11 倍和 1.2 倍。光催化活性的增强可归因于 g-C3N4 和 Ag2O 之间的协同作用以及 Ag2O 的分散性提高和粒径减小。此外，所制备的复合材料对甲基橙（MO）的光降解表现出优异的稳定性。最后，提出了一种可能的光催化和电荷分离机制。
