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Mesoporous magnetic nanocomposites: a promising adsorbent for the removal of dyes from aqueous solutions

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Abstract

Water pollution by synthetic organic dyes is mainly regarded as environmental and ecological issues worldwide and requires feasible solutions in face of the short-term risk to human health and stability of eco-systems. Therefore, in this paper, the magnetic mesoporous composites (MMC) were synthesized by surfactant template sol–gel method, using cetyl-trimethylammonium bromide (CTAB) as mesoporous structure generator and investigated for anionic and cationic dyes removal from aqueous solutions. The magnetic iron oxide nanoparticles were obtained by reverse co-precipitation, followed by mesoporous silica coating through modified sol–gel method. The obtained materials were characterized by FT-IR spectroscopy, X-ray diffraction, transmission electron microscopy, Mössbauer spectroscopy, nitrogen adsorption, small-angle X-ray scattering and magnetization measurements. The influence of CTAB amount on the morpho-textural and structural properties of nanocomposites was studied. XRD and Mössbauer spectroscopy showed that the obtained nanocomposites were composed of pure maghemite nanoparticles, and TEM images revealed particles size around 10 nm, embedded in silica matrix. The combination of magnetic properties and high surface area values, up to 695 m2/g, made suitable the obtained nanocomposites to be used as adsorbents. The dye removal efficiency was higher than 90% after the first adsorption and remained above 65% after four adsorption–desorption cycles, indicating that the as-prepared magnetic mesoporous nanocomposites can be considered excellent adsorbent materials for the removal of both anionic and cationic dyes from wastewaters, and the recycling performance revealed the stability of MMC.

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Acknowledgements

This work is dedicated to the memory of Assoc. Prof. RNDr. Daniel Nižňanský (1963–2018). This work was supported by Programs 2 and 4 of the “Coriolan Dragulescu” Institute of Chemistry, Research Projects 2.4 and 4.2. The authors thank the Romanian Academy and the Inter-Academic Exchange Program between Academy of Sciences of the Czech Republic and Romanian Academy and the Inter-Academic Exchange Program between Romanian Academy and the Hungarian Academy of Sciences. Authors thank also to Dr. Aurel Ercuţa from West University of Timişoara, Romania, for magnetic measurements and fruitful discussions.

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Authors and Affiliations

  1. “Coriolan Drăgulescu” Institute of Chemistry, Romanian Academy, Bv. Mihai Viteazu, No. 24, 300223, Timisoara, Romania

    Roxana Nicola, Otilia Costişor, Simona-Gabriela Muntean, Maria-Andreea Nistor, Ana-Maria Putz & Cătălin Ianăşi

  2. Faculty of Industrial Chemistry and Environmental Engineering, “Politehnica” University of Timişoara, Vasile Pârvan Bd., No. 6, 300223, Timisoara, Romania

    Radu Lazău

  3. Wigner Research Centre for Physics, Institute for Solid State Physics and Optics, POB 49, Budapest, 1525, Hungary

    László Almásy

  4. State Key Laboratory of Environment-Friendly Energy Materials, Southwest University of Science and Technology, Mianyang, 621010, Sichuan, China

    László Almásy

  5. Institute of Macromolecular Chemistry “Petru Poni”, Aleea Grigore Ghica Voda, nr. 41A, 700487, Iasi, Romania

    Liviu Săcărescu

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Correspondence to Simona-Gabriela Muntean or Ana-Maria Putz.

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Nicola, R., Costişor, O., Muntean, SG. et al. Mesoporous magnetic nanocomposites: a promising adsorbent for the removal of dyes from aqueous solutions. J Porous Mater 27, 413–428 (2020). https://doi.org/10.1007/s10934-019-00821-y

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