College of Chemistry, Chemical Engineering and Environment, Fujian Province Key Laboratory of Morden Analytical Science and Separation Technology, Minnan Normal University, Zhangzhou, 363000, P. R. China.
Phys Chem Chem Phys. 2019 Oct 9;21(39):21798-21805. doi: 10.1039/c9cp04445k.
Composites of the noble metal Au supported on MgAl-LDHs were prepared by a simple impregnation-reduction method to be used as thermal- and photocatalysts for the photocatalytic degradation of ciprofloxacin and thermocatalytic decomposition of formic acid to produce hydrogen. A collection of techniques, including X-ray diffraction (XRD), transmission electron microscopy (TEM) and X-ray photoelectron spectroscopy (XPS) were employed to determine the structure and morphology properties of the as-prepared Au/MgAl-LDHs. The presence of surface Au(0) in Au/MgAl-LDHs was confirmed by TEM and XPS analyses. For the first time, we compared the effect of the surfactant PVP on the catalyst and found that the Au/MgAl-LDH composite with Au particle size of 2-8 nm had better catalytic activity than the (PVP@Au)/MgAl-LDH composite with Au particle size in the range of 1-5 nm. The sizes of Au NPs in the two catalysts were similar but had different effects on the catalytic performance. This indicated that the addition of PVP had an inhibitory effect on the catalytic activity of the catalyst. To evaluate the photostability of Au/MgAl-LDHs, recycle experiments for the photocatalytic degradation of ciprofloxacin were performed, and it was found that Au/MgAl-LDHs had good stability. Finally, we also applied Au/MgAl-LDHs in environmental catalysis and energy catalysis; we hope that they will be useful in practical applications.
贵金属 Au 负载在 MgAl-LDHs 上的复合材料通过简单的浸渍-还原法制备，用作光催化降解环丙沙星和热催化分解甲酸生产氢气的热催化剂和光催化剂。采用了一系列技术，包括 X 射线衍射（XRD）、透射电子显微镜（TEM）和 X 射线光电子能谱（XPS），以确定所制备的 Au/MgAl-LDHs 的结构和形态特性。TEM 和 XPS 分析证实了 Au/MgAl-LDHs 中表面 Au(0)的存在。我们首次比较了表面活性剂 PVP 对催化剂的影响，发现 Au 粒径为 2-8nm 的 Au/MgAl-LDH 复合材料比 Au 粒径在 1-5nm 范围内的(PVP@Au)/MgAl-LDH 复合材料具有更好的催化活性。两种催化剂中 Au NPs 的尺寸相似，但对催化性能的影响不同。这表明添加 PVP 对催化剂的催化活性有抑制作用。为了评估 Au/MgAl-LDHs 的光稳定性，进行了光催化降解环丙沙星的循环实验，发现 Au/MgAl-LDHs 具有良好的稳定性。最后，我们还将 Au/MgAl-LDHs 应用于环境催化和能源催化；我们希望它们在实际应用中有用。
