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F. M. de Oliveira, B. F. Somera, M. Z. Corazza, M. J. S. Yabe, M. G. Segatelli, E. S. Ribeiro, E. C. Lima, S. L. P. Dias and C. R. T. Tarley, “Cellulose Microfiber Functionalized with N,N’-Bis (2-Aminoethyl)-1,2-Ethanediamine as a Solid Sorbent for the Fast Preconcentration of Cd(II) in Flow System Analysis,” Talanta, Vol. 85, No. 5, 2011, pp. 2417-2424. doi:10.1016/j.talanta.2011.07.088

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• TITLE: Silica Gel Supported Hydrophobic Ionic Liquid for Selective Extraction and Determination of Coumarin

  AUTHORS: Hadi M. Marwani, Esraa M. Bakhsh

  KEYWORDS: Coumarin; Silica Gel; Uptake Capacity; Ionic Liquid; Batch Method

  JOURNAL NAME: American Journal of Analytical Chemistry, Vol.4 No.1, January 9, 2013

  ABSTRACT: In this study, a modified silica gel surface with a hydrophobic ionic liquid (SG-1,10-PhenanNTf2) was used as an adsorbent for a selective extraction of coumarin prior to its determination by use of high performance liquid chromatography. Results demonstrated that SG-1,10-PhenanNTf2 phase had a good adsorption capacity up to 85.29 mg?g?1, high selectivity, good site accessibility and fast binding kinetics toward coumarin. The adsorption capacity for coumarin was improved by 62.33% with the SG-1,10-PhenanNTf2 phase as compared to activated silica gel. Adsorption isotherm data displayed that the adsorption process was mainly monolayer on a homogeneous adsorbent surface, confirming the validity of Langmuir adsorption isotherm model. The adsorption of coumarin on the SG-1,10-PhenanNTf2 phase was accomplished after only 60 min contact time. Results of kinetic models showed that the adsorption of coumarin on the SG-1,10-PhenanNTf2 phase obeyed a pseudo second-order kinetic model. Finally, the efficiency of this methodology was confirmed by applying it to real water samples.