Thermal stability and FT-IR analysis of Phosphonium-based deep eutectic solvents with different hydrogen bond donors

Ghaedi, Hosein; Ayoub, Muhammad; Sufian, Suriati; Lal, Bhajan; Uemura, Yoshimitsu

doi:10.1016/j.molliq.2017.07.016

Cited by 126 publications

(51 citation statements)

References 54 publications

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“…FTIR spectroscopy identifies the molecular functional groups of the involved species by specific vibrational frequencies defined by their dipole moment. Further, FTIR can be used to detect intermolecular interactions because they change the dipole moments of the involved functional groups, shifting the respective signals in the FTIR spectra 17,24,25 . NMR spectroscopy can be used to identify hydrogen bonding interactions or modifications through shifts in proton NMR spectra [26][27][28] .…”

Section: Introductionmentioning

confidence: 99%

Unravelling the nature of citric acid:l-arginine:water mixtures: the bifunctional role of water

Roda

Santos

Chua

et al. 2021

Phys. Chem. Chem. Phys.

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Section: Introductionmentioning

confidence: 99%

Unravelling the nature of citric acid:l-arginine:water mixtures: the bifunctional role of water

Roda

Santos

Chua

et al. 2021

Phys. Chem. Chem. Phys.

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“…The C-O-C group are considered as the electronegative groups and tend to attract electrons on hydrogen in OH bands. The occurring interactions between TPABr and TEG can be confirmed by the shift of the C-O-C group towards lower values from 1227.80 to 1115.17 cm −1 and increasing the intensity of the OH group [ 50 ]. Similar vibration towards lower values can be seen in the peaks in the bands responding with H-bending, CH 2 deformation, and N-C-C bending bonds from 1514.06–1207.26 cm −1 to 1493.48–1202.00 cm −1 , and C-N bond symmetric stretching vibration from 774.17 to 768.27 cm −1 as well as redshift phenomena O-H and C-O-H stretching bonds from 1042.73 to 1060.44 cm −1 .…”

Section: Resultsmentioning

confidence: 99%

“…Additionally, a shift of the bands originating from group C-O-C towards higher values from 1112.40 to 1123.83 cm −1 ( Figure 15 ), 1123.54 cm −1 ( Figure 16 ), and 1118.59 cm −1 ( Figure 17 ) are observed. These shifts indicate that siloxane absorption can also occur through the interaction of silicon atom (Si-OH—827.67 cm −1 and SiO—752.14 cm −1 ( Figure 15 ), Si-O—801.56 cm −1 ( Figure 16 ), Si-OH and Si-O in the range 847.96–792.11 cm −1 ( Figure 17 )) with the oxygen atoms with C-O-C in the DES (1:3) [ 50 ].…”

Section: Resultsmentioning

confidence: 99%

Removal of Siloxanes from Model Biogas by Means of Deep Eutectic Solvents in Absorption Process

2021

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The paper presents the screening of 20 deep eutectic solvents (DESs) composed of tetrapropylammonium bromide (TPABr) and glycols in various molar ratios, and 6 conventional solvents as absorbents for removal of siloxanes from model biogas stream. The screening was achieved using the conductor-like screening model for real solvents (COSMO-RS) based on the comparison of siloxane solubility in DESs. For the DES which was characterized by the highest solubility of siloxanes, studies of physicochemical properties, i.e., viscosity, density, and melting point, were performed. DES composed of tetrapropylammonium bromide (TPABr) and tetraethylene glycol (TEG) in a 1:3 molar ratio was used as an absorbent in experimental studies in which several parameters were optimized, i.e., the temperature, absorbent volume, and model biogas flow rate. The mechanism of siloxanes removal was evaluated by means of an experimental FT-IR analysis as well as by theoretical studies based on σ-profile and σ-potential. On the basis of the obtained results, it can be concluded that TPABr:TEG (1:3) is a very effective absorption solvent for the removal of siloxanes from model biogas, and the main driving force of the absorption process is the formation of the hydrogen bonds between DES and siloxanes.

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“…Several researchers have used the Tdcp at 10% weight loss (T10%) as an accurate method to analyze the stability of materials. [67][68][69] Because of two degradation steps, Tdcp at 90% weight loss (T90%) is also reported for better comparison. All TTMs had a T10% value of about 433 K. The values of T90% for TTM1, TTM2, TTM3 were 677 K, 663.24 K, and 625.03 K, respectively.…”

Section: Thermal Stability Resultsmentioning

confidence: 99%

High CO2 absorption in new amine based-transition-temperature mixtures (deep eutectic analogues) and reporting thermal stability, viscosity and surface tension: Response surface methodology (RSM)

Ghaedi

Zhao

Clough

et al. 2020

Journal of Molecular Liquids

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To study CO2 capture potential, n-methyl diethanolamine (MDEA) was used to prepare three types of transition-temperature mixtures (TTMs) by mixing methyltriphenylphosphonium bromide (MTPPB) as a hydrogen bond acceptor (HBA) and MDEA as a hydrogen bond donor (HBD) in molar ratios of 1:7, 1:10 and 1:16 HBA to HBD. Fourier transform infrared spectroscopy (FT-IR) results showed that TTMs have almost similar spectra to their HBD (MDEA) with different levels of transmittance and exhibit similar behavior. From the experimental results, it was found that the thermal stability, viscosity and surface tension of TTMs decreased as the concentration of MDEA in the mixture increased. According to response surface methodology (RSM) models and analysis of variance (ANOVA), temperature and molar ratio had a great effect on the viscosity and surface tension of TTMs. The final part of this research was the measurement of CO2 solubility in TTMs at 303.15 K at pressure up to 1.35 MPa. It was found that CO2 solubility in TTMs was enhanced as the MDEA quantity increased in the mixture up to 1:10 mole ratio. However, by increasing MDEA concentration to 16:1 mole ratio, there was a decreasing trend in the CO2 solubility data. Also, all TTMs, particularly TTM containing 10:1 mole MDEA (MTPPB-MDEA 1:10) exhibited an equilibrium loading capacity approaching 1 mole CO2 per mole solvent at high pressure, revealing

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Thermal stability and FT-IR analysis of Phosphonium-based deep eutectic solvents with different hydrogen bond donors

Cited by 126 publications

References 54 publications

Unravelling the nature of citric acid:l-arginine:water mixtures: the bifunctional role of water

Unravelling the nature of citric acid:l-arginine:water mixtures: the bifunctional role of water

Removal of Siloxanes from Model Biogas by Means of Deep Eutectic Solvents in Absorption Process

High CO2 absorption in new amine based-transition-temperature mixtures (deep eutectic analogues) and reporting thermal stability, viscosity and surface tension: Response surface methodology (RSM)

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