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Issue
Korean Journal of Chemical Engineering,
Vol.39, No.5, 1299-1306, 2022
Application of hydrophobic deep eutectic solvent for the extraction of aromatic compounds from contaminated water
Yakubu A, Gano ZS, Ahmed OU, Shuwa SM, Atta AY, Jibril BY
Hydrophobic deep eutectic solvent (DES) was synthesized from TBAB and decanoic acid and used to study the extraction of aromatic hydrocarbon from contaminated water samples. DES was screened by selecting different ratios between the TBAB and decanoic acid. A ratio of 1 : 2 was observed to be the best among others and was used for the desired application. Within the temperature range of 25-70 ℃, physicochemical properties such as density (944-915 kg/m3), viscosity (1,636-179 mPa·s), conductivity (141-1,007 µS/cm), and pH (3.14-2.73) of the synthesized DES were determined. For the extraction study, benzene, toluene, and xylene (BTX)-doped water were used as a simulated contaminated water. Response surface methodology was employed in modeling and optimizing the effects of temperature, 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 ℃, 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 the design space. Effective regeneration and reuse of the DES after each extraction was carried out for five consecutive cycles; 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.
Keywords: Remediation; Deep Eutectic Solvents; Contaminated Water; Extraction
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