In this study, a modified silica gel surface with a hydrophobic ionic liquid (SG-1,10-PhenanNTf 2 ) was used as an ad sorbent for a selective extraction of coumarin prior to its determination by use of high performance liquid chromatog raphy. Results demonstrated that SG-1,10-PhenanNTf 2 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-PhenanNTf 2 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 va lidity of Langmuir adsorption isotherm model. The adsorption of coumarin on the SG-1,10-PhenanNTf 2 phase was ac complished after only 60 min contact time. Results of kinetic models showed that the adsorption of coumarin on the SG-1,10-PhenanNTf 2 phase obeyed a pseudo second-order kinetic model. Finally, the efficiency of this methodology was confirmed by applying it to real water samples.
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