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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

  • Materials (Organic, Inorganic, Electronic, Thin Films)
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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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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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Authors and Affiliations

  1. School of Chemical Engineering, Sungkyunkwan University (SKKU), Suwon, 16419, Korea

    Soo Young Yun, Jun Yup Lee & Jaeyun Kim

  2. Department of Health Sciences and Technology, Samsung Advanced Institute for Health Science & Technology (SAIHST), Sungkyunkwan University (SKKU), Suwon, 16419, Korea

    Jaeyun Kim

  3. Biomedical Institute for Convergence at SKKU (BICS), Sungkyunkwan University (SKKU), Suwon, 16419, Korea

    Jaeyun Kim

  4. Institute of Quantum Biophysics (IQB), Sungkyunkwan University (SKKU), Suwon, 16419, Korea

    Jaeyun Kim

Authors
  1. Soo Young Yun
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  2. Jun Yup Lee
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Correspondence to Jaeyun Kim.

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11814_2020_482_MOESM1_ESM.pdf

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

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