Abstract
Magnetic halloysite–chitosan (MHNT-CTN) nanocomposites were synthesized by turning magnetic halloysite nanotubes (MHNTs) into nanocomposites using biopolymeric chitosan (CTN). The magnetic properties of pure halloysite nanotubes (HNTs) were achieved using the co-precipitation method, and MHNTs were synthesized. The characterization of the MHNT-CTN nanocomposite and the pure states of the components forming the nanocomposite was performed by FTIR, TGA, TEM, and VSM. Methylene blue (MB) adsorption on MHNT-CTN nanocomposites was investigated as a function of medium pH, the mass ratio of the components forming the nanocomposite material, and the initial MB concentration. The optimum conditions for MB adsorption on MHNT-CTN were determined as pH 8.0, in a solution volume of 25 mL, 25 mg MHNT-CTN, and the MHNT-to-CTN mass ratio of 2:1. The highest adsorption efficiency for MB adsorption on MHNT2-CTN1 was reached at an initial MB concentration of 20 mg/L, and it was found to be 83.9%. The adsorption equilibrium data obtained from the studies on MB adsorption on MHNT-CTN were used to investigate compatibility with the Langmuir, Freundlich, and Redlich–Peterson adsorption models. It was found out that the MB adsorption kinetics was compatible with the pseudo-second-order model.
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Acknowledgements
The authors would like to thank TUBITAK, the Scientific and Technological Research Council of Turkey, for the 2210-C program. The authors also would like to thank the Middle East Technical University Central Laboratory for the TEM and VSM measurements of the MHNT-CTN nanocomposites.
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Türkeş, E., Sağ Açıkel, Y. Synthesis and characterization of magnetic halloysite–chitosan nanocomposites: use in the removal of methylene blue in wastewaters. Int. J. Environ. Sci. Technol. 17, 1281–1294 (2020). https://doi.org/10.1007/s13762-019-02550-w
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DOI: https://doi.org/10.1007/s13762-019-02550-w