Kou Yichuan, Wu Tong, Xing Guoliang, Huang Xiaohu, Han Donglai, Yang Shuo, Guo Chenzi, Gao Wei, Yang Jinghai, Liu Yang, Wang Dandan
College of Physics, Jilin Normal University, Siping 136000, People's Republic of China. Key Laboratory of Functional Materials Physics and Chemistry of the Ministry of Education, Jilin Normal University, Changchun 130103, People's Republic of China.
Nanotechnology. 2020 May 29;31(22):225701. doi: 10.1088/1361-6528/ab767b. Epub 2020 Mar 13.
In this work, we reported the tailored design of highly efficient FeO-Au magnetic nanocomposite (MNP) catalysts. FeO nanocrystals with three different morphologies have been developed with engineered amounts of urea, and the plausible mechanism has been proposed. Then by controlling the amount of Au seeds, FeO-Au MNPs with different morphologies and tunable Au deposition have been realized. Characterizations including x-ray diffraction (XRD), transmission electron microscopy (TEM), Mössbauer spectra, and elemental mapping are implemented to unveil the structural and physical characteristics of the successfully developed FeO-Au MNPs with different morphologies. The catalytic ability of FeO-Au MNPs with different morphologies have been compared by applying them to degrading RhB and 4-NP, meanwhile the correlation between the amount of Au seeds and the turnover frequency as well as the catalytic ability of FeO-Au MNPs is investigated systematically. We found that the flower-like FeO-Au MNPs with 20 ml Au seeds added achieved the best degradation efficiency of 96.7%, and their catalytic ability were almost unchanged after recycling. Out study sheds the light into the tailored design of highly efficient and recyclable catalysts for RhB and 4-NP.
在本工作中，我们报道了高效FeO-Au磁性纳米复合（MNP）催化剂的定制设计。通过控制尿素用量制备了三种不同形貌的FeO纳米晶体，并提出了可能的机理。然后，通过控制金种子的用量，实现了具有不同形貌和可调金沉积量的FeO-Au MNPs。采用X射线衍射（XRD）、透射电子显微镜（TEM）、穆斯堡尔谱和元素映射等表征手段，揭示了成功制备的不同形貌FeO-Au MNPs的结构和物理特性。通过将不同形貌的FeO-Au MNPs应用于降解罗丹明B（RhB）和4-硝基苯酚（4-NP），比较了它们的催化能力，同时系统研究了金种子用量与周转频率以及FeO-Au MNPs催化能力之间的相关性。我们发现，添加20 ml金种子的花状FeO-Au MNPs实现了96.7%的最佳降解效率，并且在循环使用后其催化能力几乎不变。我们的研究为RhB和4-NP高效可回收催化剂的定制设计提供了思路。
