以硫脲为前驱体，KNO₃为掺杂剂，用热聚合法制备了不同钾离子掺杂量的石墨相氮化碳可见光催化剂。利用扫描电子显微镜（SEM）、透射电子显微镜（TEM）、X射线衍射（XRD）、傅里叶红外变换光谱（FT-IR）、紫外可见漫反射（UV-Vis-DRS）和荧光分光光度计（PL）等分析手段对催化剂的结构和性质进行了一系列表征，并将催化剂在可见光下对亚甲基蓝有机染料水溶液进行光催化降解。结果表明，钾离子的引入没有改变g-C₃N₄的本体结构，钾离子掺杂的系列催化剂吸收边带发生明显的红移现象。实验结果表明，K_0.3-C₃N₄ 2 h内对亚甲基蓝的降解率达到94%，表现出最佳的光催化活性；对催化剂进行4次重复性实验后，降解率仍然达到80%左右。

Graphite phase carbon nitride (g-C₃N₄) visible-light photocatalysts doped with different amounts of potassium ions are prepared by thermal polymerization method,using thiourea as the precursor and KNO₃ as the dopant.The prepared samples are characterized by scanning electron microscopy (SEM),transmission electron microscopy (TEM),X-ray diffraction (XRD),Fourier transform infrared spectroscopy (FT-IR),UV-Vis-DRS and fluorescence spectrophotometer (PL).The results show that the incorporation of potassium ions does not change the bulk structure of g-C₃N₄,and the absorption band of K⁺ doped catalyst shows a red shift.The experimental results show that K_0.3-C₃N₄ performs the best photocatalytic activity and can make the degradation rate of methylene blue reach 94% within 2 h,and the degradation rate remains about 80% after four times of repeated experiments.

刘宗梅(1991-),女,硕士生,研究方向为光催化废水处理,liuzongmei_1118@126.com