title: Allyl triphenyl phosphonium bromide based DES-functionalized carbon nanotubes for the removal of mercury from water.
abstract: Recently, deep eutectic solvents (DESs) have shown their new and interesting ability for chemistry through their involvement in variety of applications. This study introduces carbon nanotubes (CNTs) functionalized with DES as a novel adsorbent for Hg2+from water. Allyl triphenyl phosphonium bromide (ATPB) was combined with glycerol as the hydrogen bond donor (HBD) to form DES, which can act as a novel CNTs functionalization agent. The novel adsorbent was characterized using Raman, FTIR, XRD, FESEM, EDX, BET surface area, TGA, TEM and Zeta potential. Response surface methodology was used to optimize the removal conditions for Hg2+. The optimum removal conditions were found to be pH 5.5, contact time 28 min, and an adsorbent dosage of 5 mg. Freundlich isotherm model described the adsorption isotherm of the novel adsorbent, and the maximum adsorption capacity obtained from the experimental data was 186.97 mg g-1. Pseudo-second order kinetics describes the adsorption rate order.
authors.affiliation: Department of Civil Engineering, University of Malaya, Kuala Lumpur, 50603, Malaysia; University of Malaya Centre for Ionic Liquids (UMCiL), University Malaya, Kuala Lumpur, 50603, Malaysia.
authors.forename: Mohamed Khalid
authors.initials: MK
authors.lastname: AlOmar
authors.affiliation: University of Malaya Centre for Ionic Liquids (UMCiL), University Malaya, Kuala Lumpur, 50603, Malaysia; Nanotechnology & Catalysis Research Centre (NANOCAT), IPS Building, University of Malaya, 50603, Kuala Lumpur, Malaysia. Electronic address: mdsd68j@gmail.com.
authors.forename: Mohammed Abdulhakim
authors.initials: MA
authors.lastname: Alsaadi
authors.affiliation: Department of Civil Engineering, University of Malaya, Kuala Lumpur, 50603, Malaysia; University of Malaya Centre for Ionic Liquids (UMCiL), University Malaya, Kuala Lumpur, 50603, Malaysia.
authors.forename: Maan
authors.initials: M
authors.lastname: Hayyan
authors.affiliation: School of Energy, Geoscience, Infrastructure and Society (EGIS), Heriot-Watt University Malaysia, 62200, Putrajaya, Malaysia.
authors.forename: Shatirah
authors.initials: S
authors.lastname: Akib
authors.affiliation: Nanotechnology & Catalysis Research Centre (NANOCAT), IPS Building, University of Malaya, 50603, Kuala Lumpur, Malaysia.
authors.forename: Muhammad
authors.initials: M
authors.lastname: Ibrahim
authors.affiliation: University of Malaya Centre for Ionic Liquids (UMCiL), University Malaya, Kuala Lumpur, 50603, Malaysia; Department of Chemical Engineering, University of Malaya, Kuala Lumpur, 50603, Malaysia.
authors.forename: Mohd Ali
authors.initials: MA
authors.lastname: Hashim
mesh_terms: D000327:Adsorption; D000498:Allyl Compounds / Q000737:chemistry*; D001965:Bromides / Q000737:chemistry*; D007700:Kinetics; D008628:Mercury / Q000737:chemistry*; D008962:Models, Theoretical; D037742:Nanotubes, Carbon / Q000737:chemistry*; D012997:Solvents / Q000737:chemistry; D014874:Water Pollutants, Chemical / Q000737:chemistry*; D018508:Water Purification / Q000379:methods
chemical_list: D000498:Allyl Compounds; D001965:Bromides; D037742:Nanotubes, Carbon; D012997:Solvents; D014874:Water Pollutants, Chemical; D008628:Mercury
keywords: Carbon nanotubes; Deep eutectic solvents; Functionalization; Ionic liquids; Mercury adsorption