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Synthesis of an ion-imprinted sorbent by surface imprinting of magnetized carbon nanotubes for determination of trace amounts of cadmium ions

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Abstract

The authors report on the preparation of sol-gel coated magnetized carbon nanotubes whose surface were imprinted with Cd2+ ions and the application of these materials on selective preconcentration of Cd2+ ions in different water samples. Fe3O4 particles and tetraethyl orthosilicate were used as a magnetic ingredient and as a surface modifier for the carbon nanotubes, respectively. The Cd2+-imprinted polymer was prepared by grafting copolymerization of Cd2+ ions as template, methacryloylsulfamethizole and 2-vinylpyridine as polymerizable ligands, methacrylic acid as functional monomer, and ethyleneglycoldimethacrylate as crosslinker. The resulting magnetic nanoparticles were characterized by Fourier transform infrared spectrometry, the Brunauer-Emmett-Teller method, and by scanning electron microscopy. Isothermal absorption, absorption kinetics and selectivity were studied in detail. The experimental conditions were optimized. Figures of merit include (a) a maximum adsorption capacity of 81 mg·g−1; (b) relative selectivity coefficients of 2.41, 2.36, 1.41, 1.66, and 1.70 for Cd2+/Ni2+, Cd2+/Co2+, Cd2+/Zn2+, Cd2+/Cu2+, and Cd2+/Pb2+, respectively; (c) a detection limit of 0.29 ng·mL−1, (d) an enrichment factor of 55.5; (e) an intra-day precisions of 1.13%; and (f) an inter-day precision of 1.39%. The method was successfully applied to the determination of cadmium in spiked samples including feed water of an ammonia production unit, tap water, industrial waste water from a petrochemical plant, river water from the Garrahi River, bay water from Khor Musa, and marsh water from the Shadegan wetland.

Trace amounts of Cd2+ ions in some environmental and industrial water samples were separated and preconcentrated by a new surface ion-imprinted polymer, chemically grafted on the surface of the magnetized carbon nanotubes, before determination using flame atomic absorption spectrometer.

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Acknowledgements

The authors wish to thank ShahidChamran University of Ahvaz Research Council for financial support of this work (Grant 1395).

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  1. Department of Chemistry, Faculty of Science, Shahid Chamran University of Ahvaz, Ahvaz, Iran

    Behrooz Zargar & Ali Khazaeifar

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  1. Behrooz Zargar
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  2. Ali Khazaeifar
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Correspondence to Behrooz Zargar.

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Zargar, B., Khazaeifar, A. Synthesis of an ion-imprinted sorbent by surface imprinting of magnetized carbon nanotubes for determination of trace amounts of cadmium ions. Microchim Acta 184, 4521–4529 (2017). https://doi.org/10.1007/s00604-017-2489-4

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  • DOI: https://doi.org/10.1007/s00604-017-2489-4

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