Highly efficient and recyclable catalyst: porous Fe 3 O 4 –Au magnetic nanocomposites with tailored synthesis

作者：Yichuan Kou, Tong Wu, Guoliang Xing, Xiaohu Huang, Donglai Han, Shuo Yang, Chenzi Guo, Wei Gao, Jinghai Yang, Yang Liu, Dandan Wang · 发表于：Nanotechnology · 年份：2020 · DOI：10.1088/1361-6528/ab767b · 被引用次数：17 · 研究领域：Nanomaterials for catalytic reactions、Catalytic Processes in Materials Science、Nanocluster Synthesis and Applications

Abstract In this work, we reported the tailored design of highly efficient Fe 3 O 4 –Au magnetic nanocomposite (MNP) catalysts. Fe 3 O 4 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, Fe 3 O 4 –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 Fe 3 O 4 –Au MNPs with different morphologies. The catalytic ability of Fe 3 O 4 –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 Fe 3 O 4 –Au MNPs is investigated systematically. We found that the flower-like Fe 3 O 4 –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.