界面聚合法制备PANI/g-C3N4复合催化剂及其热稳定性和可见光催化性能

利用界面聚合法, 成功将聚苯胺(PANI)纳米棒生长在石墨型氮化碳(g-C₃N₄)片层上, 制备了PANI/g-C₃N₄复合光催化剂. 采用傅里叶变换红外(FTIR)光谱、X射线衍射(XRD)、扫描电镜(SEM)、紫外-可见(UV-Vis)光谱、热重分析(TGA)和电化学工作站表征手段考察样品的结构、形貌及性能, 以可见光催化降解亚甲基蓝为模型考察样品的可见光催化活性. 实验结果表明, 在复合材料中的g-C₃N₄能很好地分散成层状, 并在层间与PANI纳米棒形成复合物, 这种特殊的复合结构不仅利于片状g-C₃N₄对PANI链段运动的限制及对其降解产物的物理屏蔽, 从而可以提高复合材料的热稳定性, 而且具有优越的可见光催化性能.

PANI/g-C3N4 Composites Synthesized by Interfacial Polymerization and Their Thermal Stability and Photocatalytic Activity

Polyaniline (PANI) nanorods grown on layered graphitic carbon nitride (g-C₃N₄) sheets are synthesized by interfacial polymerization. The structure, morphology, and properties of the photocatalysts are characterized by Fourier transform infrared (FTIR), X- ray diffraction (XRD), and UV-visible (UV-Vis) spectroscopies, scanning electron microscopy (SEM), thermogravimetric analysis (TGA), and electrochemical analysis. Photocatalytic degradation of methylene blue is investigated to determine the photoactivity of the catalyst. The results suggest that g-C₃N₄ possesses good dispersion with an intercalated nanostructure and interfacial adhesion with PANI. In addition, the PANI/g-C₃N₄ composites retain the advantage of high thermal stability resident with g-C₃N₄. This is ascribed to a physical barrier effect on the emanation of degradation products and inhibited polymer motion. The resulting composites also show more intensive photocatalytic activity than does g-C₃N₄.