TY - JOUR
T1 - A complete in-situ analysis of UV–vis and 2D-FTIR spectra of the molecular interaction between RO16 (azo dye) and synthesized ammonium-based ionic liquids
AU - Castillo-Cervantes, Jazmin N.
AU - Gómora-Herrera, Diana R.
AU - Navarrete-Bolaños, J.
AU - Likhanova, Natalya V.
AU - Olivares-Xometl, Octavio
AU - Lijanova, Irina V.
N1 - Publisher Copyright:
© 2020 Elsevier B.V.
PY - 2021/1/1
Y1 - 2021/1/1
N2 - The liquid-liquid extraction process of the azo dye RO16 from an aqueous solution by ionic liquids (ILs) was investigated. For this purpose, 5 immiscible and halogen-free-ammonium-based ILs were designed and synthesized. The extraction process in different pH media (2–12) at changing temperatures (10, 20, 30 °C) was carried out. The complete in-situ analysis of UV–vis and 2D FTIR spectra was performed to elicit the molecular interaction mechanism between RO16 (azo dye) and [TOMA]+[Tar]− (IL). The results show that the molecular structure of the ILs affected the extraction efficiency and depended on the number of functional groups. The analysis suggests not only the formation of hydrogen bonds between the IL and dye in acid medium, but also the formation of intermolecular interactions such as ion-dipole and dipole-dipole in alkaline medium.
AB - The liquid-liquid extraction process of the azo dye RO16 from an aqueous solution by ionic liquids (ILs) was investigated. For this purpose, 5 immiscible and halogen-free-ammonium-based ILs were designed and synthesized. The extraction process in different pH media (2–12) at changing temperatures (10, 20, 30 °C) was carried out. The complete in-situ analysis of UV–vis and 2D FTIR spectra was performed to elicit the molecular interaction mechanism between RO16 (azo dye) and [TOMA]+[Tar]− (IL). The results show that the molecular structure of the ILs affected the extraction efficiency and depended on the number of functional groups. The analysis suggests not only the formation of hydrogen bonds between the IL and dye in acid medium, but also the formation of intermolecular interactions such as ion-dipole and dipole-dipole in alkaline medium.
KW - Aqueous solutions
KW - Azo-dye
KW - Coupling UV–vis and FTIR
KW - Extraction process
KW - Hydrophobic ammonium-based ionic liquids
UR - http://www.scopus.com/inward/record.url?scp=85090422379&partnerID=8YFLogxK
U2 - 10.1016/j.seppur.2020.117652
DO - 10.1016/j.seppur.2020.117652
M3 - Artículo
AN - SCOPUS:85090422379
SN - 1383-5866
VL - 254
JO - Separation and Purification Technology
JF - Separation and Purification Technology
M1 - 117652
ER -