K/Cl掺杂g-C_(3)N_(4)的制备及其光催化性能研究北大核心CSCD

采用湿化学方法制备了K/Cl掺杂石墨相氮化碳(g-C_(3)N_(4))纳米材料.以三聚氰胺、KCl作为前驱体,经过溶解、沉淀和焙烧过程,使K/Cl元素在g-C_(3)N_(4)结构上均匀分布.K/Cl掺杂的引入并不影响g-C_(3)N_(4)物相的形成,而是使样品的比表面积增加至18.36 m^(2)·g^(-1),是纯g-C_(3)N_(4)的1.7倍.利用光催化降解气态污染物来表征材料的光催化性能,结果表明,全光谱光照下CN-K/Cl-0.07的性能是纯g-C_(3)N_(4)的2.0倍.光催化性能的提升归因于K/Cl双原子掺杂,不但提升了材料的光吸收能力,而且有利于光生电子-空穴的分离.4次循环试验后,CN-K/Cl-0.07光催化降解异丙醇的性能没有明显降低,证明其具有良好的稳定性.K/Cl掺杂g-C_(3)N_(4)光催化活性高且使用性能好,将会在气体污染物降解领域产生广泛的应用.

Preparation and Photocatalytic Properties of K/Cl Doped g-C3N4

In this paper, K/Cl doped graphite carbon nitride (g-C3N4) nanomaterials were prepared by wet chemical method. In the preparation process, melamine and KCl were used as precursors, and K/Cl elements were uniformly distributed in g-C3N4 structure through dissolution, precipitation and calcination method. The introduction of g-C3N4 could not affect the formation of g-C3N4 crystalline phase, but increase the specific surface area of the sample to 18.36 m2·g-1, which was 1.7 times that of pure g-C3N4. The performance of photocatalytic materials was characterized by photocatalytic degradation of gaseous pollutants. The results showed that the performance of CN-K/Cl-0.07 was 2.0 times higher than that of pure g-C3N4 under full spectrum illumination. The improvement of photocatalytic performance was attributed to the fact that K/Cl doping not only improved the light absorption capacity of the material, but also promoted the separation and transfer of photogenerated electrons and holes. After four cycle tests, the photocatalytic isopropanol degradation performance of CN-K/Cl-0.07 was not significantly reduced, which proved that it had good stability. K/Cl doped g-C3N4 has high photocatalytic activity and good performance, and would have broad application prospects in the field of gas pollutants degradation.