School of Chemical Engineering, Shenyang University of Chemical Technology, Shenyang 110141, China.
J Nanosci Nanotechnol. 2019 Feb 1;19(2):1090-1097. doi: 10.1166/jnn.2019.15741.
The Cu-doped ZnAl layered double hydroxides (LDH) were papered by coprecipitation. The prepared samples were characterized by mutiple techniques including X-ray diffraction (XRD), Brunauer-Emmett-Teller (BET) surface area, scanning electronic microscopy (SEM), transmission electron microscopy (TEM), X-ray photoelectron spectroscopy (XPS) and UV-vis diffuse-reflectance spectroscopy (UV-vis DRS). The doping of Cu into the LDH sheets results in formation of the distorted CuO6 octahedrons which contribute for the excitation of electrons under visible light. The doped Cu also serves as photo-generated charges separator and improves the visible-light-driven photocatalytic activity of ZnAl LDH. A degradation mechanism based on the hydroxyl radical as the active species was proposed.
采用共沉淀法制备了铜掺杂的 ZnAl 层状双氢氧化物（LDH）。通过 X 射线衍射（XRD）、BET 比表面积、扫描电子显微镜（SEM）、透射电子显微镜（TEM）、X 射线光电子能谱（XPS）和紫外可见漫反射光谱（UV-vis DRS）等多种技术对制备的样品进行了表征。Cu 掺杂到 LDH 片层中导致形成扭曲的 CuO6 八面体，这有助于可见光下电子的激发。掺杂的 Cu 还可以作为光生电荷分离剂，提高 ZnAl LDH 的可见光驱动光催化活性。提出了一种基于羟基自由基作为活性物种的降解机制。
