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Effective adsorptive performance of Fe3O4@SiO2 core shell spheres for methylene blue: kinetics, isotherm and mechanism

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Abstract

In this study, Fe3O4 nanoparticles (NPs) as a core surrounded with thick and tunable SiO2 shells were successfully synthesized and characterized by means of N2-isotherm, scanning electron microscopy (SEM), X-ray diffraction (XRD), transmission electron microscopy (TEM), fourier transform infrared (FT-IR) and UV–Vis diffuse reflection spectroscopy (UV–Vis DRS) techniques. The characterization results revealed that well-structured SiO2 shell of 105 nm thick is uniformly formed around Fe3O4 (NPs size of 500 nm) surface. The application of the synthesized core–shell structures was investigated for methylene blue (MB), rhodamine B (Rh B) and methyl orange (MO) toxic dyes adsorptive removal from water by batch adsorption methods and different adsorption parameters such as time, pH, material dosage, concentration of solution and different dyes were optimized. The highest adsorption capacity (123 mg g−1) of MB dye was achieved on Fe3O4@SiO2. The isotherms and kinetic models exhibited that MB adsorption values are well described by Freundlich isotherm and pseudo-first-order kinetics models. The adsorptive binding of MB with Fe3O4@SiO2 was directed through electrostatic interaction and size filter effect. After regeneration, approximately 100% MB dye adsorption capacity was recovered. Thus, we can say that the Fe3O4@SiO2 is an outstanding material for dyes removal from water.

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  • 29 May 2019

    The article Effective adsorptive performance of Fe3O4@SiO2 core shell spheres for methylene blue: kinetics, isotherm and mechanism, written by Fazle Subhan, Sobia Aslam, Zifeng Yan, Mawaz Khan, U. J. Etim, Muhammad Naeem was originally published electronically on the publisher���s internet portal (currently SpringerLink) on 18 March 2019 with open access.. With the author(s)��� decision to step back from Open Choice, the copyright of the article changed on April 2018 to �� Springer Science+Business Media, LLC, part of Springer Nature 2019 and the article is forthwith distributed under the terms of copyright.

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Acknowledgements

National Natural Science Foundation of China (Grant No. 21650110460 and 05E18040190) is greatly acknowledged for the present work.

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Correspondence to Fazle Subhan or Zifeng Yan.

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The original version of this article was revised: The article was originally published in SpringerLink with open access. With the author(s)’ decision to step back from Open Choice, the copyright of the article changed on May 2019 to © Springer Science+Business Media, LLC, part of Springer Nature 2019.

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Subhan, F., Aslam, S., Yan, Z. et al. Effective adsorptive performance of Fe3O4@SiO2 core shell spheres for methylene blue: kinetics, isotherm and mechanism. J Porous Mater 26, 1465–1474 (2019). https://doi.org/10.1007/s10934-019-00744-8

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