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In relation to this article, we declare that there is no conflict of interest.
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Received August 18, 2019
Accepted January 5, 2020
articles This is an Open-Access article distributed under the terms of the Creative Commons Attribution Non-Commercial License (http://creativecommons.org/licenses/bync/3.0) which permits unrestricted non-commercial use, distribution, and reproduction in any medium, provided the original work is properly cited.
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Synthesis of hollow magnetic carbon microbeads using iron oleate@alginate core-shell hydrogels and their application to magnetic separation of organic dye

1School of Chemical Engineering, Sungkyunkwan University (SKKU), Suwon 16419, Korea 2Department of Health Sciences and Technology, Samsung Advanced Institute for Health Science & Technology (SAIHST), Sungkyunkwan University (SKKU), Suwon 16419, Korea
Korean Journal of Chemical Engineering, May 2020, 37(5), 875-882(8), 10.1007/s11814-020-0482-9
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Abstract

The use of biopolymers obtained from natural resources as a carbon source has attracted much attention. In this study, we introduced a novel method for synthesis of hollow magnetic carbon microbeads (HMCMs) based on core-shell alginate hydrogel microbeads consisting of a hydrophobic iron-oleate core encapsulated in a shell of ionically cross-linked alginate hydrogel using the syringe pump with the fabricated double-layered syringe needle. This allows in-situ formation of magnetic particles and carbon walls simultaneously during carbonization. After surface passivation with a silica coating followed by direct carbonization led to in-situ formation of iron oxide particles via the thermal decomposition of the iron-oleate precursor in the core region and a carbon shell derived from the cross-linked alginate polymer during carbonization. The subsequent removal of the silica shell resulted in the formation of HMCMs with a unique surface wrinkle morphology and superparamagnetic property. HMCMs were applied to remove dye from the contaminated wastewater, and the dye-adsorbed HMCMs could be easily removed by an external magnetic field. The proposed synthesis of hollow carbon microbeads can be further optimized to control the size of core-shell microbeads and the components encapsulated in the core and shell, and hence will be useful for preparing diverse types of beads for various applications.

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