超薄磁性 Mg-Al LDH 光催化剂增强 CO 还原：制备与机理。
Ultrathin magnetic Mg-Al LDH photocatalyst for enhanced CO reduction: Fabrication and mechanism.
机构信息
Faculty of Chemistry and Chemical Engineering, Liaoning Normal University, Dalian 116029, PR China.
Institute of the Green Chemistry and Chemical Technology, School of Chemistry and Chemical Engineering, Jiangsu University, Zhen Jiang 212000, PR China.
出版信息
J Colloid Interface Sci. 2019 Nov 1;555:1-10. doi: 10.1016/j.jcis.2019.07.025. Epub 2019 Jul 12.
The two-dimensional (2D) ultrathin Mg-Al layered double hydroxide modified by magnetic FeO (FeO/Mg-Al LDH) was successfully synthesized via the co-precipitation method. The FeO/Mg-Al LDH not only exhibits superior separation efficiency of charge carriers but also possesses signally enhanced photocatalytic activity for CO reduction than Mg-Al LDH. The as-prepared FeO/Mg-Al LDH affords the CO and CH generation rate of 442.2 µmol g h and 223.9 µmol g h. The enhanced reduction CO activity mainly comes from synergetic effect of FeO and ultrathin Mg-Al LDH. And FeO can increase the separation efficiency of photogenerated electron-hole pairs, and ultrathin Mg-Al LDH can reduce the transmission resistance of charge carriers. Moreover, a detailed mechanism insight of FeO/Mg-Al LDH for CO reduction is also investigated by a series of characterization methods and activity experiments. This work offers a simple and environment-friendly approach to develop recycled photocatalysts in CO reduction treatment.
通过共沉淀法成功合成了二维（2D）超薄 Mg-Al 层状双氢氧化物修饰的磁性 FeO（FeO/Mg-Al LDH）。FeO/Mg-Al LDH 不仅表现出优异的载流子分离效率，而且比 Mg-Al LDH 具有显著增强的 CO 还原光催化活性。所制备的 FeO/Mg-Al LDH 的 CO 和 CH 生成速率分别为 442.2µmol•g-1•h-1 和 223.9µmol•g-1•h-1。增强的 CO 还原活性主要来自于 FeO 和超薄 Mg-Al LDH 的协同效应。FeO 可以提高光生电子空穴对的分离效率，超薄 Mg-Al LDH 可以降低载流子的传输阻力。此外，还通过一系列的表征方法和活性实验研究了 FeO/Mg-Al LDH 对 CO 还原的详细机理。这项工作为开发用于 CO 还原处理的可回收光催化剂提供了一种简单环保的方法。
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