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

Hadi M. Marwani, Esraa M. Bakhsh

Center of Excellence for Advanced Materials Research, King Abdulaziz University, Jeddah, Saudi Arabia.
Department of Chemistry, Faculty of Science, King Abdulaziz University, Jeddah, Saudi Arabia.

DOI: 10.4236/ajac.2013.41002                

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.

Keywords

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

Conflicts of Interest

The authors declare no conflicts of interest.

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