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以二氰二胺和柠檬酸铋为原料,采用一步水热法合成原位N掺杂(BiO)2CO3纳米片自组装分等级微球结构。采用XRD、SEM、XPS、FT-IR、UV-Vis DRS和PL等对合成的材料进行表征,结果表明,不同二氰二胺加入量会对(BiO)2CO3的形貌结构、禁带宽度以及电子-空穴复合率产生显著影响。二氰二胺在水热过程水解柠檬酸铋,同时N原子原位掺杂进入(BiO)2CO3晶格。N掺杂使(BiO)2CO3的光响应范围大幅拓展至可见光,通过价带XPS获得了掺杂N元素减小(BiO)2CO3禁带宽度的证据。在可见光照射下,原位N掺杂(BiO)2CO3分等级微球结构表现出对液相罗丹明B和气相NO优异的可见光催化降解活性,高于N掺杂TiO2和C掺杂TiO2。研究结果对拓展N掺杂作用向非TiO2体系的转变具有重要意义。
Using dicyandiamide and bismuth citrate as raw materials, a one-step hydrothermal synthesis of in-situ N-doped (BiO) 2CO3 nanosheets self-assembled hierarchical microspheres were prepared. The synthesized materials were characterized by XRD, SEM, XPS, FT-IR, UV-Vis DRS and PL. The results showed that the addition of different dicyanodiamines would affect the morphology and structure of (BiO) 2CO3, The electron-hole recombination rate has a significant effect. Dicyandiamide hydrolysates bismuth citrate hydrothermally, while N atoms are doped into the (BiO) 2CO3 lattice in situ. N-doped (BiO) 2CO3 greatly expands the range of photoresponse to visible light, and evidenced by the bandgap of X-doped N-doped (BiO) 2CO3 bandgap is obtained. In visible light irradiation, in-situ N-doped (BiO) 2CO3 graded microspheres exhibited excellent photocatalytic activity for photocatalytic degradation of liquid Rhodamine B and gas phase NO, which was higher than that of N-doped TiO2 and C-doped TiO2. The research results are of great significance to the transformation of N doping to non-TiO2 systems.