摘要
采用共研磨的三聚氰胺和磷酸二氢钾为前驱体,通过热缩聚法制备了磷钾共掺杂的石墨氮化碳。利用X射线衍射、扫描电镜、傅里叶红外光谱和光致发光光谱对样品的结构、形貌和光学性质进行了表征,并通过在可见光下降解罗丹明B评测了样品的光催化活性。结果表明:适量磷、钾元素的掺杂有利于样品光催化活性的提升。钾原子的掺杂能够诱导氰基的形成,有利于氧在样品表面的吸附,并提升石墨氮化碳层间的电子迁移,而P原子的掺杂改变了电荷局域分布,有利于光生电荷的分离和迁移,两者的协同作用是磷钾共掺杂的石墨氮化碳样品光催化活性提升的可能原因。
Phosphorus and potassium co-doped graphitic carbon nitride(g-C_(3)N_(4))was prepared via thermal polycondensation using co-ground melamine and potassium dihydrogen phosphate as precursors.The structure,morphology,and optical properties of the samples were characterized by X-ray diffraction,scanning electron microscopy,Fourier transform infrared spectroscopy,and photoluminescence spectroscopy.The photocatalytic activity of the samples was evaluated by the degradation of rhodamine B under visible light irradiation.The results indicated that appropriate doping with phosphorus and potassium elements enhanced the photocatalytic activity of the samples.Doping with potassium atoms induced the formation of cyano groups,facilitating oxygen adsorption on the sample surface and promoting electron transfer between the layers of g-C_(3)N_(4).Meanwhile,doping with phosphorus atoms altered the local charge distribution,benefiting the separation and migration of photogenerated charges.The synergistic effect of these two factors is likely responsible for the improved photocatalytic activity of the phosphorus and potassium co-doped g-C_(3)N_(4) samples.
作者
余淑君
胡可
YU Shu-jun;HU Ke(Nanyang Institute of Technology,Nanyang 473004,China)
出处
《南阳理工学院学报》
2025年第4期96-102,共7页
Journal of Nanyang Institute of Technology
关键词
热缩聚
石墨氮化碳
光催化
磷钾共掺杂
thermal polycondensation
graphitic carbon nitride
photocatalysis
phosphorus and potassium co-doped
