Lead removal from water by choline chloride based deep eutectic solvents functionalized carbon nanotubes

Mohamed Khalid Alomar, Mohammed Abdulhakim Alsaadi*, Maan Hayyan, Shatirah Mohamed Akib, Rusul Khaleel Ibrahim, Mohd Ali Hashim

*Corresponding author for this work

Research output: Contribution to journalArticlepeer-review

95 Citations (Scopus)


Deep eutectic solvents (DESs) have gained increasing amounts of interest due to their involvement in variety of applications. In this study, we synthesized six DESs systems based on choline chloride and six different hydrogen bond donors (HBD). Next, the synthesized DESs were used as functionalization agents with carbon nanotubes (CNTs) for use as adsorbents of lead ions, specifically Pb(II), from water. Screening studies for 24 different DES-CNT based adsorbents were conducted. The selected adsorbents samples were characterized using Raman spectroscopy, Fourier transform infrared (FTIR) spectroscopy, XRD, FESEM, EDX, BET surface area, Zeta potential, and thermogravimetric analysis (TGA). Removal percentages and uptake capacities of Pb(II) on the novel selected adsorbents were optimized by RSM-CCD experimental design. The optimum conditions were found to be pH 5 with adsorbent dosage of 5 mg and contact time of 15 min. The maximum adsorption capacity of the selected adsorbent was found to be 288.4 mg/g. Langmuir and Freundlich adsorption isotherm models were also investigated and three kinetic models of adsorption were studied.

Original languageEnglish
Pages (from-to)883-894
Number of pages12
JournalJournal of Molecular Liquids
Early online date25 Jul 2016
Publication statusPublished - Oct 2016


  • Carbon nanotubes
  • Deep eutectic solvents
  • Functionalization
  • Lead removal
  • Water treatment

ASJC Scopus subject areas

  • Electronic, Optical and Magnetic Materials
  • Atomic and Molecular Physics, and Optics
  • Condensed Matter Physics
  • Spectroscopy
  • Physical and Theoretical Chemistry
  • Materials Chemistry


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