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Magnetic metal-organic frameworks for the extraction of trace amounts of heavy metal ions prior to their determination by ICP-AES

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Abstract

The authors describe the preparation of two kinds of metal-organic frameworks (MOFs), referred to as TMU-8 and TMU-9. The MOFs were applied to the preconcentration of the ions Co(II), Cu(II), Pb(II), Cd(II), Ni(II), Cr(III), and Mn(II) from aqueous solutions. The roles of the azine groups in TMU-8 (in comparison to TMU-9 which does not have an azine group) and the role of void spaces of these MOFs toward the adsorption of metal ions also are evaluated. The studies reveal that TMU-8 has a better adsorption capability than TMU-9. A magnetic TMU-8 was then fabricated by in-situ synthesis of a magnetic core-shell nanocomposite. The material was chosen as an efficient sorbent for the preconcentration of the above metal ions, followed by their determination by flow injection inductively coupled plasma atomic emission spectrometry. The assay was optimized using a combination of central composite design (CCD) and a Bayesian regularized artificial neural network (BRANN) technique. Under optimal conditions, the preconcentration factors are in the range between 66 and 232, and detection limits are as low as 0.3 to 1 μg ⋅L−1. The relative standard deviations are <6.4% (for n = 3; at 50 μg ⋅ L−1). Real samples were analyzed, and the results demonstrate that such core-shell magnetic microspheres are promising sorbents for rapid and efficient extraction of heavy metal ions from complex samples.

New magnetic metal organic frame works were synthesized and applied to the preconcentration of the ions Co(II), Cu(II), Pb(II), Cd(II), Ni(II), Cr(III) and Mn(II).

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Acknowledgements

The authors gratefully acknowledge financial support from Tarbiat Modares University.

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Authors and Affiliations

  1. Department of Chemistry, Tarbiat Modares University, P.O. Box 14115-175, Tehran, Iran

    Meysam Safari, Yadollah Yamini, Mohammad Yaser Masoomi, Ali Morsali & Ahmad Mani-Varnosfaderani

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  1. Meysam Safari
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  2. Yadollah Yamini
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  3. Mohammad Yaser Masoomi
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  4. Ali Morsali
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  5. Ahmad Mani-Varnosfaderani
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Correspondence to Yadollah Yamini.

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Safari, M., Yamini, Y., Masoomi, M.Y. et al. Magnetic metal-organic frameworks for the extraction of trace amounts of heavy metal ions prior to their determination by ICP-AES. Microchim Acta 184, 1555–1564 (2017). https://doi.org/10.1007/s00604-017-2133-3

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