Improved visible light photocatalytic activity of sphere-like BiOBr hollow and porous structures synthesized via a reactable ionic liquid
Improved visible light photocatalytic activity of sphere-like BiOBr hollow and porous structures synthesized via a reactable ionic liquid
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通过可反应离子液体合成的球状 BiOBr 空心和多孔结构提高可见光光催化活性
DOI：
10.1039/c0dt01511c
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发表时间：
2011-01-01
影响因子：
4
通讯作者：
Xu, Yuanguo
中科院分区：
文献类型：
--
作者：
Xia, Jiexiang;Yin, Sheng;Xu, Yuanguo
在可反应离子液体1-十六烷基-3-甲基溴化咪唑鎓（[C(16)mim]Br）存在下，通过一锅EG辅助溶剂热法成功合成了BiOBr均匀的花状中空微球和多孔纳米球结构。通过X射线衍射（XRD）、X射线光电子能谱（XPS）、扫描电子显微镜（SEM）、透射电子显微镜（TEM）、能量色散X射线光谱（EDS）和漫反射光谱（DRS）对所制备的样品进行了表征。讨论了空心微球生长的可能形成机制。反应过程中，离子液体[C(16)mim]Br同时起到溶剂、反应物和模板剂的作用。此外，还评估了 BiOBr 花状中空多孔结构在可见光照射下降解罗丹明 B (RhB) 的光催化活性。结果表明，BiOBr 多孔纳米球样品表现出比传统制备的样品和 TiO2 (Degussa, P25) 高得多的光催化活性。还详细讨论了光催化剂的结构与光催化活性之间的关系；可以认为，BiOBr材料增强的光催化活性可归因于协同效应，包括高BET表面积、能带结构、较小的粒径和光吸光度。
BiOBr uniform flower-like hollow microsphere and porous nanosphere structures have been successfully synthesized through a one-pot EG-assisted solvothermal process in the presence of reactable ionic liquid 1-hexadecyl-3-methylimidazolium bromide ([C(16)mim]Br). The as-prepared samples were characterized by X-ray diffraction (XRD), X-ray photoelectron spectroscopy (XPS), scanning electron microscopy (SEM), transmission electron microscopy (TEM), energy-dispersive X-ray spectroscopy (EDS) and diffuse reflectance spectroscopy (DRS). Possible formation mechanism for the growth of hollow microspheres was discussed. During the reactive process, ionic liquid [C(16)mim]Br played the role of solvent, reactant and template at the same time. Moreover, the photocatalytic activities of BiOBr flower-like hollow and porous structures were evaluated on the degradation of rhodamine B (RhB) under visible light irradiation. The results assumed that BiOBr porous nanospheres sample showed much higher photocatalytic activity than the conventionally prepared sample and TiO2 (Degussa, P25). The relationship between the structure of the photocatalyst and the photocatalytic activities were also discussed in detail; it can be assumed that the enhanced photocatalytic activities of BiOBr materials could be ascribed to a synergistic effect, including high BET surface area, the energy band structure, the smaller particle size and light absorbance.