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Synthesis of Fe3O4@ZIF-8 magnetic core-shell microspheres and their potential application in a capillary microreactor

Authors Zhang, Tong
Zhang, Xiongfu
Yan, Xinjuan
Kong, Linying
Zhang, Guangcai
Liu, Haiou
Qiu, Jieshan
Yeung, King Lun View this author's profile
Issue Date 2013
Source Chemical Engineering Journal , v. 228, July 2013, p. 398-404
Summary A facile synthesis strategy for preparing Fe3O4@ZIF-8 magnetic core-shell microspheres has been successfully developed. The procedure involves first pre-treating the magnetic cores with an anionic polyelectrolyte to alter the surface charge of the particles and adsorb Zn2+ cations to initiate nucleation and then growing a thin layer of ZIF-8 to form a highly reactive, magnetic core-shell microsphere (Fe3O4@ZIF-8). The characterization by various techniques indicates that ZIF-8 shell is continuous and has an average thickness of around 100 nm. The Fe3O4@ZIF-8 microspheres as catalysts could be easily filled into a capillary microreactor with the help of an external magnetic field. The microreactor demonstrates excellent catalytic activity at a shorter residence time for Knoevenagel condensation reaction of benzaldehyde and ethyl cyanoacetate. (C) 2013 Elsevier B.V. All rights reserved.
ISSN 1385-8947
Language English
Format Article
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