A highly selective conversion of toxic nitrobenzene to nontoxic aminobenzene by Cu2O/Bi/Bi2MoO6
A highly selective conversion of toxic nitrobenzene to nontoxic aminobenzene by Cu2O/Bi/Bi2MoO6
复制标题
Cu2O/Bi/Bi2MoO6 高选择性地将有毒硝基苯转化为无毒氨基苯
DOI：
10.1039/c8dt01536h
复制
发表时间：
2018
影响因子：
4
通讯作者：
Wang Xiaojing
中科院分区：
文献类型：
--
作者：
Wu Yuhang;Song Meiting;Wang Qijun;Wang Ting;Wang Xiaojing
Cu2O/Bi/Bi2MoO6 是一种三元催化剂，采用原位催化还原反应精心制备。所有合成材料均通过高分辨率透射电子显微镜 (HRTEM)、粉末 X 射线衍射 (XRD)、X 射线光电子能谱 (XPS) 和紫外-可见漫反射光谱 (UV-vis DRS) 进行仔细研究。 Bi元素是由Bi2MoO6（BM）经4-硝基苯酚（4-NP）循环还原催化过程生成的，均匀分散在BM花状球体的叶子表面，同时涂覆有Cu2O。与单相 Cu2O 和 BM 纳米颗粒相比，多相样品实现了将高毒性 4-NP 转化为毒性较低的氨基苯的高效催化活性 (10 053.6 min−1 g−1)。此外，通过连续的回收实验证实了复合样品优异的可重复使用稳定性。提出 Bi3+/Bi0 对是关键的活性物质，它们是在 Cu2O 的帮助下通过快速还原和氧化产生的。设计的夹层结构中氧化铜/金属Bi/BM（Cu2O/Bi/BM）之间的活性界面接触促进了生产并保持了Bi3+/Bi0对的平衡，有助于增强活性和优异的稳定性。
Cu2O/Bi/Bi2MoO6, a ternary catalyst, was expertly prepared using an in situ catalytic reduction reaction. All synthetic materials were carefully researched by high-resolution transmission electron microscopy (HRTEM), powder X-ray diffraction (XRD), X-ray photoelectron spectroscopy (XPS), and ultraviolet-visible diffuse reflection spectra (UV-vis DRS). The elemental Bi was generated from Bi2MoO6 (BM) after a circular reduction catalysis process of 4-nitrophenol (4-NP) and evenly dispersed in the surface of the leaves of BM flower-like spheres, which was simultaneously coated with Cu2O. The multiphase samples achieved highly effective catalytic activity (10 053.6 min−1 g−1) for the conversion of the highly toxic 4-NP to the less toxic aminobenzene, compared to the single phase Cu2O and BM nanoparticles. Moreover, the excellent reusable stability of the compositing samples was confirmed by executing successive recycling experiments. It was proposed that the Bi3+/Bi0 pairs were the key active species which were produced via prompt reduction and oxidation with the help of Cu2O. The active interfacial contact between copper oxide/metallic Bi/BM (Cu2O/Bi/BM) in the designed sandwich structure facilitated the production and maintained the balance of Bi3+/Bi0 pairs, contributing to the enhanced activity and excellent stability.