부산대학교 도서관

Hydrophobic deep eutectic solvent (DES) was synthesized from TBAB and decanoic acid and used tostudy the extraction of aromatic hydrocarbon from contaminated water samples. DES was screened by selecting differentratios between the TBAB and decanoic acid. A ratio of 1 : 2 was observed to be the best among others and wasused for the desired application. Within the temperature range of 25-70 oC, physicochemical properties such as density(944-915 kg/m3), viscosity (1,636-179 mPa·s), conductivity (141-1,007 S/cm), and pH (3.14-2.73) of the synthesizedDES were determined. For the extraction study, benzene, toluene, and xylene (BTX)-doped water were used as a simulatedcontaminated water. Response surface methodology was employed in modeling and optimizing the effects oftemperature, time, and solvent mass fraction on the extraction efficiency of the DES. Extraction efficiency of 68.1%,70.84% and 77.73% for BTX, respectively, was recorded at optimum values of 25 oC, 60 min and 0.6 (solvent mass fraction). Extraction efficiency as high as 86.61%, 88.94%, and 92.71% for BTX, respectively, can be obtained within thedesign space. Effective regeneration and reuse of the DES after each extraction was carried out for five consecutivecycles; their results showed no significant decrease in their respective extraction efficiencies and recovery of the DES. This, therefore, improves the overall performance of hydrophobic DES for the extraction process.