Graphene oxide wrapped magnetic nanoparticle composites induced by SiO<sub>2</sub> coating with excellent regenerability

Zhong-liang Hu; Hou-quan Cui; Yan-huai Ding; Jing-ying Li; Yi-rong Zhu; Zhao-hui Li

doi:10.1007/s12613-020-2229-3

Volume 28 Issue 12

Dec. 2021

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Article Navigation > International Journal of Minerals, Metallurgy and Materials > 2021 > 28(12): 2001-2007

Zhong-liang Hu, Hou-quan Cui, Yan-huai Ding, Jing-ying Li, Yi-rong Zhu, and Zhao-hui Li, Graphene oxide wrapped magnetic nanoparticle composites induced by SiO₂ coating with excellent regenerability, Int. J. Miner. Metall. Mater., 28(2021), No. 12, pp. 2001-2007. https://doi.org/10.1007/s12613-020-2229-3

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Zhong-liang Hu, Hou-quan Cui, Yan-huai Ding, Jing-ying Li, Yi-rong Zhu, and Zhao-hui Li, Graphene oxide wrapped magnetic nanoparticle composites induced by SiO2 coating with excellent regenerability, Int. J. Miner. Metall. Mater., 28(2021), No. 12, pp. 2001-2007. https://doi.org/10.1007/s12613-020-2229-3

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Research Article

Graphene oxide wrapped magnetic nanoparticle composites induced by SiO₂ coating with excellent regenerability

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Corresponding authors:
Zhong-liang Hu E-mail: david10103@sina.com

Zhao-hui Li E-mail: lzh69@xtu.edu.cn
Received: 20 September 2020; Revised: 19 November 2020; Accepted: 20 November 2020; Available online: 26 November 2020

Abstract

Abstract

Graphene oxide (GO) wrapped Fe₃O₄ nanoparticles (NPs) were prepared by coating the Fe₃O₄ NPs with a SiO₂ layer, and then modifying by amino groups, which interact with the GO nanosheets to form covalent bonding. The SiO₂ coating layer plays a key role in integrating the magnetic nanoparticles with the GO nanosheets. The effect of the amount of SiO₂ on the morphology, structure, adsorption, and regenerability of the composites was studied in detail. An appropriate SiO₂ layer can effectively induce the GO nanosheets to completely wrap the Fe₃O₄ NPs, forming a core-shell Fe₃O₄@SiO₂@GO composite where Fe₃O₄@SiO₂ NPs are firmly encapsulated by GO nanosheets. The optimized Fe₃O₄@SiO₂@GO sample exhibits a high saturated adsorption capacity of 253 mg·g⁻¹ Pb(II) cations from wastewater, and the adsorption process is well fitted by Langmuir adsorption model. Notably, the composite displays excellent regeneration, maintaining a ~90% adsorption capacity for five cycles, while other samples decrease their adsorption capacity rapidly. This work provides a theoretical guidance to improve the regeneration of the GO-based adsorbents.
- graphene oxide;
- ferroferric oxide;
- core-shell structure;
- adsorption;
- regeneration;
- covalent bonding;
- lead(II) removal

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