以三聚氰胺为原料制备类石墨相氮化碳(g-C3N4),采用球磨与超声联用技术制备g-C3N4二维纳米片. 利用X 射线衍射光谱(XRD)、紫外-可见漫反射(UV-Vis)光谱、扫描电镜(SEM)、透射电镜(TEM)、原子力显微镜(AFM)、荧光(PL)光谱等分析手段对制备的催化剂进行了表征. 结果表明: g-C3N4二维纳米片具有与体相g-C3N4相同的晶体结构,片层结构仅有5个原子层厚.g-C3N4二维纳米片增加了对可见光的吸收,提高了光生电子-空穴对的分离效率.以染料罗丹明B的降解反应研究了g-C3N4二维纳米片在可见光下的催化性能. 结果表明,球磨超声1 h后制备的g-C3N4二维纳米片表现出最佳的光催化性能, 150 min 内对罗丹明B的降解率高达94%,是体相g-C3N4的2 倍.
The graphite-like carbon nitride (g-C3N4) two-dimension (2D) nanosheet were successfully prepared by a ball-mi-lling and ultrasound process using melamine as raw material.The samples were characterized by X-ray diffraction (XRD), scanning electron microscopy (SEM), transmission electron microscopy (TEM), ultraviolet-visible diffuse reflectance spectroscopy (UV-Vis DRS), atomic force microscope (AFM) and photoluminescence spectrum (PL).The XRD results showed that g-C3N4 2D nanosheet had the same crystal phase as g-C3N4.The exfoliated products were comprised of only 5 C-N layers.The g-C3N4 2D nanosheet improved the absorption of visible light and accelerated the separation of photo-generated electron-hole pairs.The photocatalytic performance of the samples was evaluated by photocatalytic oxidation of rhodamine B (RhB) under visible light irradiation.The results show that g-C3N4 2D nanosheet exhibited a much higher degradation rate which is 2 times as high as that of pure g-C3N4.
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