界面聚合法制备PANI/g-C_3N_4复合催化剂及其热稳定性和可见光催化性能

PANI/g-C_3N_4 Composites Synthesized by Interfacial Polymerization and Their Thermal Stability and Photocatalytic Activity

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/gC3N4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.

Polyaniline （PANI） nanorods grown on layered graphitic carbon nitride （g-C3N4） sheets are synthesized by interracial 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-CsN4 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-C3N,. 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.