Silica Gel Supported Hydrophobic Ionic Liquid for Selective Extraction and Determination of CoumarinReport as inadecuate




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In this study, a modified silica gel surface with ahydrophobic ionic liquid SG-1,10-PhenanNTf2 was used as an adsorbentfor a selective extraction of coumarin prior to its determination by use ofhigh performance liquid chromatography. Results demonstrated thatSG-1,10-PhenanNTf2 phase had a good adsorption capacity up to 85.29mg?g?1, high selectivity, good site accessibility and fast bindingkinetics toward coumarin. The adsorption capacity for coumarin was improved by62.33% with the SG-1,10-PhenanNTf2 phase as compared to activated silicagel. Adsorption isotherm data displayed that the adsorption process was mainlymonolayer on a homogeneous adsorbent surface, confirming the validityof Langmuir adsorption isotherm model. The adsorption of coumarin on theSG-1,10-PhenanNTf2 phase was accomplished afteronly 60 min contact time. Results of kinetic models showed that the adsorptionof coumarin on the SG-1,10-PhenanNTf2 phase obeyed a pseudosecond-order kinetic model. Finally, the efficiency of this methodology wasconfirmed by applying it to real water samples.

KEYWORDS

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

Cite this paper

H. Marwani and E. Bakhsh -Silica Gel Supported Hydrophobic Ionic Liquid for Selective Extraction and Determination of Coumarin,- American Journal of Analytical Chemistry, Vol. 4 No. 1, 2013, pp. 8-16. doi: 10.4236-ajac.2013.41002.





Author: Hadi M. Marwani, Esraa M. Bakhsh

Source: http://www.scirp.org/



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