利用阳离子取代法制备阳离子掺杂的石墨相氮化碳样品，将共晶熔盐[m（KCl）∶m（NaCl）∶m（LiCl）=1∶1∶1]和三聚氰胺按照质量比10∶1的比例悬蒸干燥，同时加入氯化锰溶液使得锰元素的掺杂质量分数分别为0%、0.3%、0.5%、0.7%和1%，在温度520℃锻烧4 h后得到多种元素掺杂的纳米管材料，之后将样品酸处理3 h，去掉Na⁺、K⁺、Li⁺离子，最后将样品放入马弗炉中400℃煅烧2 h，可以去除Cl⁺和H⁺得到只有锰掺杂的氮化碳材料。该制备方法解决了传统离子掺杂氮化碳材料比表面积小、形貌不可控的问题。同时利用SEM、XRD、BET、UV-Vis、FT-IR和PL对阳离子取代法制备的锰离子掺杂的氮化碳纳米管的形貌和尺寸、孔结构、吸光范围和载流子分离效率等进行表征，并在可见光下对样品进行光催化产氢性能测试。

A sequential cation-exchanging method is developed at the first time to synthesize cation doped g-C₃N₄.The eutectic molten salt (LiCl:KCl:NaCl=1:1:1 in weight) and melamine are firstly mixed in the ratio of 10:1 and then dissolved in the distilled water.Then different amounts of MnCl₂ solution is added as a doping precursor,with concentration of manganese being 0%,0.3%,0.5% and 0.7%,respectively.After water in the solution is entirely evaporated out by a rotary evaporator,the remaining powder is put into an alumina crucible with a cover,and then heated at 520℃ for 4 h to get multi-elements doped nanotubes.The obtained nanotubes are treated with 1 M HCl solution for 3 h,which removing Na⁺,K⁺ and Li⁺.The powder sample is finally calcined at 400℃ for 2 h again,removing Cl⁺ and H⁺ and finally get a Mn doped g-C₃N₄ sample.This preparation method solves the problem that the conventional ion doped carbon nitride material has a small specific surface area and uncontrollable morphology.The morphology,phase structure,pore structure,light absorption and carrier separation efficiency of the obtained samples are detected by SEM,XRD,BET,UV-Vis,FT-IR and PL.The photocatalytic hydrogen production performances of samples are evaluated under visible light.

闫潇潇(1993-),女,硕士研究生,主要从事光电功能材料的研究,yxx1234321@163.com