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W. L. Hough, M. Smiglak, H. Rodriguez, R. P. Swatloski, S. K. Spear, D. T. Daly, J. Pernak, J. E. Grisel, R. D. Carliss, M. D. Soutullo, J. H. J. Davis and R. D. Rogers, “The Third Evolution of Ionic Liquids: Active Pharmaceutical Ingredients,” New Journal of Chemistry, Vol. 31, No. 8, 2007, pp. 1429-1436. doi:10.1039/b706677p

has been cited by the following article:

• 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.