Abstract
We have covalently grafted phenyl-iminodiacetic acid groups onto multi-walled carbon nanotubes via a diazotation reaction. The resulting material was characterized by FT-IR and UV–vis spectroscopy, by TGA, XPS and SEM. It is shown to be a valuable solid-phase extraction adsorbent for the preconcentration of trace quantities of Fe(III), Cu(II) and Pb(II) ion from aqueous solution prior to their determination by ICP-OES. Various factors affectting the separation and preconcentration were investigated. The enrichment factor typically is 100. Under optimized experimental conditions, the maximum adsorption capacities for Fe(III), Cu(II) and Pb (II) are 64.5, 30.5 and 17.0 mg g-1, respectively, the detection limits are 0.26, 0.15 and 0.18 ng mL-1, and the relative standard deviations are <2.5% (n = 6). The new adsorbent shows superior reusability and stability. The procedure was successfully applied to the determination of trace quantities of Fe(III), Cu(II) and Pb (II) in water samples.
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Acknowledgements
We thank the National Key Technology R&D Program of China (No. 2008BAJ08B13), the National Natural Science Foundation of China (No. 21007046) and the China Postdoctoral Science Foundation (No. 20080440646) & Special Foundation (No. 201003279) for financially supporting this work.
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Cui, Y., Hu, ZJ., Yang, JX. et al. Novel phenyl-iminodiacetic acid grafted multiwalled carbon nanotubes for solid phase extraction of iron, copper and lead ions from aqueous medium. Microchim Acta 176, 359–366 (2012). https://doi.org/10.1007/s00604-011-0725-x
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DOI: https://doi.org/10.1007/s00604-011-0725-x