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Preconcentration of mercury(II) using a thiol-functionalized metal-organic framework nanocomposite as a sorbent

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Abstract

A novel type of porous metal-organic framework (MOF) was obtained from thiol-modified silica nanoparticles and the copper(II) complex of trimesic acid. It is shown that this nanocomposite is well suitable for the preconcentration of Hg(II) ions. The nanocomposite was characterized by Fourier transfer infrared spectroscopy, X-ray powder diffraction, energy-dispersive X-ray diffraction and scanning electron microscopy. The effects of pH value, sorption time, elution time, the volume and concentration of eluent were investigated. Equilibrium isotherms were studied, and four models were applied to analyze the equilibrium adsorption data. The results revealed that the adsorption process obeyed the Langmuir model. The maximum monolayer capacity and the Langmuir constant are 210 mg g−1 and 0.273 L mg−1, respectively. The new MOF-based nanocomposite is shown to be an efficient and selective sorbent for Hg(II). Under the optimal conditions, the limit of detection is 20 pg mL−1 of Hg(II), and the relative standard deviation is <7.2 % (for n = 3). The sorbent was successfully applied to the rapid extraction of Hg(II) ions from fish, sediment, and water samples.

Schematic illustration of Hg(II) sorption onto SH@SiO2/MOF nanocomposite.

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Acknowledgments

The author would like to thank for the financial support from North Tehran Branch, Islamic Azad University.

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Authors and Affiliations

  1. Department of Chemistry, Islamic Azad University, North Tehran Branch, P.O. Box 1913674711, Tehran, Iran

    Mahmoud Reza Sohrabi

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  1. Mahmoud Reza Sohrabi
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Correspondence to Mahmoud Reza Sohrabi.

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Sohrabi, M.R. Preconcentration of mercury(II) using a thiol-functionalized metal-organic framework nanocomposite as a sorbent. Microchim Acta 181, 435–444 (2014). https://doi.org/10.1007/s00604-013-1133-1

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  • DOI: https://doi.org/10.1007/s00604-013-1133-1

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