g-C3N4纳米管的制备及其光催化降解性能

以三聚氰胺和碳酸氢铵混合物为原料,采用简便热解法制备g-C_3N_4纳米管。热解过程中碳酸氢铵分解释放出大量的NH3,能够诱导纳米管的形成。利用X射线衍射(XRD)、扫描电子显微镜(SEM)、红外光谱(IR)、N_2吸附-脱附、紫外-可见漫反射光谱以及紫外可见光谱(UV)等分析测试方法对该光催化剂的微观形貌结构和催化性能进行了表征。以罗丹明光催化降解为模型反应研究了g-C_3N_4纳米管的光催化活性。g-C_3N_4纳米管的表面积明显增大,且能够有效地促进光生电子转移,在可见光下具有较强的光催化性能,降解率在60和120 min时分别能达到95%和99.4%,且循环重复利用5次后降解率不低于92%。

Preparation and Photocatalytic Performance of g-C3N4 Nanotubes

g-C₃N₄ nanotubes were prepared by pyrolysis of a mixture of melamine and ammonium bicarbonate via a simple and convenient method. The morphology and catalytic properties of the photocatalysts were characterized by X-ray diffraction (XRD), scanning electron microscopy (SEM), infrared spectroscopy (IR), N₂ adsorption-desorption, ultraviolet-visible diffuse reflectance spectroscopy and UV-visible spectroscopy. The photocatalytic activity of g-C₃N₄ nanotubes to rhodamine B degradation was investigated. The photocatalytic activity of the g-C₃N₄ nanotubes under the visible light irradiation was effectively promoted because the tube structure can effectively promote the photo-electron transfer. The degradation percentage of rhodamine B was 95 and 99.4% at 60 and 120 min respective. The g-C₃N₄ nanotubes also displayed high recyclability.