Boron extraction from aqueous medium using novel hydrophobic deep eutectic solvents

Ghaiath Almustafa, Reyihangu Sulaiman, Mahendra Kumar, Idowu Adeyemi, Hassan A. Arafat, Inas AlNashef

Research output: Chapter in Book/Report/Conference proceedingConference contributionpeer-review

14 Scopus citations


In this work, four novel hydrophobic deep eutectic solvents (DES) were prepared from a combination of menthol (Men) or thymol (Thy) as hydrogen bond acceptors (HBA) with 1-decanol (Dec) or 2-methyl-2,4-pentanediol (MPD) as hydrogen bond donors (HBD), for the extraction of boron from aqueous solutions. The DESs were characterized in terms of their physical (density, viscosity and water content), and thermal (melting point and decomposition temperature) properties. The DES’ critical properties were estimated using a group contribution method based on the modified Lydersen-Joback-Reid and Lee-Kesler mixing rules. Later, the solvents were evaluated for their capability to extract boron from different aqueous solutions and the extraction and stripping efficiencies were used as performance evaluation criteria. The hydrophobic DES made with MPD showed high extraction efficiency of boron (in the boric acid form), up to 90.1% and 83.2% for Thy:MPD and Men:MPD, respectively. Stripping of boron from the DES phase was done using 0.1 M NaOH as stripping solution. Moreover, FTIR spectra were recorded before and after extraction of boron to better understand the extraction mechanism. The extraction was due to the complexation between MPD in the DES and boric acid. The hydrophobic DESs offer an environmentally benign alternative as extractants, and allow for the use of water miscible diols, like MPD, in the extraction of boron from aqueous environments such as industrial wastewater or boron-rich brines.

Original languageBritish English
Title of host publication2020 Virtual AIChE Annual Meeting
ISBN (Electronic)9780816911141
StatePublished - 2020
Event2020 AIChE Annual Meeting - Virtual, Online
Duration: 16 Nov 202020 Nov 2020

Publication series

NameAIChE Annual Meeting, Conference Proceedings


Conference2020 AIChE Annual Meeting
CityVirtual, Online


  • 4-pentanediol
  • Boron
  • Extraction 2-methyl-2
  • Hydrophobic deep eutectic solvents
  • Menthol
  • Thymol


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