Fe3O4/Au binary nanocrystals: Facile synthesis with diverse structure evolution and highly efficient catalytic reduction with cyclability characteristics in 4-nitrophenol
Fe3O4/Au binary nanocrystals: Facile synthesis with diverse structure evolution and highly efficient catalytic reduction with cyclability characteristics in 4-nitrophenol
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Fe3O4/Au 二元纳米晶体：易于合成，具有多种结构演化和高效催化还原，在 4-硝基苯酚中具有可循环特性
DOI：
10.1016/j.powtec.2018.06.037
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发表时间：
2018-10-01
影响因子：
5.2
通讯作者：
Xing, S.
中科院分区：
文献类型：
--
作者：
Liu, Y.;Zhang, Y. Y.;Xing, S.
Fe3O4/Au binary nanocrystals have been widely utilized in catalysis, biology, medicine and other fields due to their unique magnetic and optical properties. In the present work, diversely structured Fe3O4/Au core-satellite nanocubes and Fe3O4@Au core-shell nanocrystals are fabricated by a seed deposition and a seed-mediated growth process, respectively. The developed binary nanocrystals equipped with highly efficient and recyclable catalytic reduction characteristics for 4-nitrophenol (4-NP). Extensive x-ray diffraction and transmission electron microscopy studies demonstrate that the amount of Au seeds deposited onto the surfaces of Fe3O4 nanocubes increases with increasing the additive amount of Au seeds. Aiming at structure tailored engineering, Fe3O4@Au core-shell nanocrystals are formed when Fe3O4/Au-50 mL core-satellite nanocubes are chosen as a template for further coating with gold shell by seed-mediated growth. Moreover, the magnetic saturation is gradually weakened with increasing addition quantity of Au seeds. Importantly, 4-NP is employed as a model molecule to investigate the effect of developed Fe3O4/Au binary nanocrystals on the catalytic performance. The rate constant of Fe3O4/Au core-satellite nanocubes is higher than that of Fe3O4@Au core-shell nanocrystals because of distinctly different surface area-to-volume ratio of Au nanocrystals. Fe3O4/Au core-satellite nanocubes show good separation ability and reusability, which could be repeatedly applied for nearly complete reduction of 4-NP for at least six successive cycles. Such cost effective and recyclable catalyst provides a new material paradigm for environmental protection applications. (C) 2018 Elsevier B.V. All rights reserved.
