以双氰胺单体、硝酸铁和磷酸氢二铵为前驱体,制备了铁磷共掺杂氮化碳(P/Fe-CN)。采用X射线衍射(XRD)、扫描电镜(SEM)、透射电镜(TEM)、X光电子能谱(XPS)和BET比表面积分析等方法研究了P/Fe-CN的晶相、结构和元素组成。结果表明:Fe和P共掺杂的协同作用打开了原始氮化碳紧密的片层堆积结构和团聚状态,有效降低了原始g-C3N4的禁带宽度,增加了活性物质,提高了光催化性能。其中,P掺杂量为5%的双掺杂样品(5% P/Fe-CN)在可见光下对甲基橙(MO)表现出最优的光催化活性。其光催化降解MO的速率常数为0.03863min-1,是g-C3N4光催化效率的4.7倍。紫外-可见光(UV-Vis)结果表明,5% P/Fe-CN的带隙宽度为2.248eV,较原始g-C3N4减小了0.331eV。
Fe-P co-doped carbon nitride was fabricated using dicyandiamide monomer,iron nitrate,and diammonium hydrogen phosphate as precursors.The crystal phase,structure,and element composition of P/Fe-CN were analyzed by XRD,SEM,TEM,XPS,and BET.The results showed that the synergistic effect of Fe and P co-doping successfully opened the tight lamellar stacking structure and agglomeration state of pristine carbon nitride,effectively reducing the forbidden bandwidth of pristine g-C3N4,increasing the active substances,and improving the photocatalytic performance.Among them,the double-doped sample with 5% P doping (5% P/Fe-CN) showed the optimal photocatalytic activity for methyl orange (MO) under visible light.The rate constant of its photocatalytic degradation of MO was 0.03863 min-1,which was 4.7 times higher than that of g-C3N4.The UV-Vis results indicated that the bandgap width of 5% P/Fe-CN was 2.248eV,which was 0.331eV less than that of the pristine g-C3N4.
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基金资助
国家自然科学基金(31960297);云南省农业基础研究联合专项(202301BD070001-079);中青年学术和技术带头人后备人才项目(202405AC350031)
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