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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Acknowledgement
This work was supported by the Basic Science Research Program through the National Research Foundation (NRF) funded by the Ministry of Science and ICT, Republic of Korea (2010-0027955, 2019R1A2C2004765).
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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
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Yun, S.Y., Lee, J.Y. & Kim, J. Synthesis of hollow magnetic carbon microbeads using iron oleate@alginate core-shell hydrogels and their application to magnetic separation of organic dye. Korean J. Chem. Eng. 37, 875–882 (2020). https://doi.org/10.1007/s11814-020-0482-9
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DOI: https://doi.org/10.1007/s11814-020-0482-9