Solubility and Spectral Studies for SO₂ in a Binary System of Triethylene Glycol + Dimethyl Sulfoxide at T = (298.15, 303.15, and 308.15) K and p = 123.15 kPa

Abstract

In this work, isothermal gas−liquid equilibrium (GLE) data were measured for the mixture SO 2 + N 2 in the system of triethylene glycol (TEG) + dimethyl sulfoxide (DMSO) at T = (298.15, 303.15, and 308.15) K and p = 123.15 kPa. Henry's law constants (HLCs) were obtained by fitting the linear slope of the GLE data. The results indicated that the solubility of dilute SO 2 in the system of TEG + DMSO increased with the increasing DMSO concentrations, and HLCs decreased with the increasing temperatures. The regeneration experimental results showed that the absorption of SO 2 in the binary system was reversible, and the solvent could be reused without significant loss of absorption capacity. Additionally, FTIR, UV−vis, and 1 H NMR spectral results indicated that intermolecular hydrogen bonding association among TEG, DMSO, and SO 2 molecules was formed.

Solubility Properties and Absorption Mechanism Investigation of Dilute SO2 in Propylene Glycol Monomethyl Ether + Dimethyl Sulfoxide System

“…As shown Figure a, two absorption bands were observed at nearly 278 and 212 nm, which was due to the n →π* electronic transition of SO 2 at longer wavelength and n →σ * for O atom in PGME or π → π* for SO 2 at shorter wavelength . The absorption intensity of the band at nearly 278 nm increases with the increasing SO 2 concentration, which may result from the probability of electronic transition of n→ π* for SO 2 increase when the SO 2 concentration increase.…”

“…As shown in Figure , the solubility of SO 2 in the binary system of PGME (1) + DMSO (2) increased when DMSO concentrations increased, and the solubility of SO 2 presented a minimum value (0.0074 mol·kg –1 ) in pure PGME; meanwhile, the pure DMSO ( w 1 = 0%) showed the maximum value of 0.0781 mol·kg –1 to dissolve SO 2 . , In addition, the absorption capacity of SO 2 in the system of PGME + DMSO were stronger than PEG300 + DMSO and TEG + DMSO systems at the same alcohol ratio.…”

“…As shown Figure 8a, two absorption bands were observed at nearly 278 and 212 nm, which was due to the n→π* electronic transition of SO 2 at longer wavelength and n→σ* for O atom in PGME or π→π* for SO 2 at shorter wavelength. 31 The 17.7 33 27.5 34 37.1 31 69.0 30 1.56 HLC (10 3 × Pa kg mol −1 ) 24.53 18 19.17 35 11.91 31 8.44 30 8.29 T/K H′ (10 3 ) 32 The position of shorter band moved to longer wavelength when the SO 2 concentrations increase, which result from the decreasing effects of O atoms in PGME or DMSO on S atom in SO 2 make the π→π* electron transition of S atom in SO 2 change easier; 42 also, the increasing conjugated degree in SO 2 and DMSO molecules from intermolecular interaction among PGME, DMSO and SO 2 lead to electronic transition change easier. The bands at nearly 278 nm was due to the n→π* electronic transition of O atom in SO 2 , 32 and the absorption intensity increased with the increasing SO 2 concentrations.…”

Porous Fe-Doped β-Ni(OH)2 Nanopyramid Array Electrodes for Water Splitting

“…FTIR was employed to analyze the composition and surface functional group changes of the U-β-Ni­(OH) 2 /NF and U–Fe-β-Ni­(OH) 2 /NF-2 samples (Figure b). The intense bands from 3200–3500 cm –1 for NiC 2 O 4 /NF and FeNi–C 2 O 4 /NF samples belong to the stretching vibration bands of the hydroxyl group in H 2 O. , Two relatively weak bands at 2916 and 2846 cm –1 and the band at nearly 1614 cm –1 correspond to the CH stretching model of the carbon chain as well as the asymmetric stretching vibration model of the CO group, respectively. , Also, the bands at 1358, 1313, and 823 cm –1 signify the characteristic peak of the CO group, and the 753 cm –1 corresponds to the stretching vibration of the NiO group. , Furthermore, we found that the peaks of the NiO group in FeNi–C 2 O 4 /NF are expressed at a lower wavenumber region compared to NiC 2 O 4 /NF, suggesting that the Fe introduced into NiC 2 O 4 weakens the bond strength of the NiO group, causing an increase in bond length. After the anion-exchange reaction, we observed a narrow and sharp band for a stretching vibration peak of a non-hydrogen-bonded, geminal, free hydroxyl group in U-β-Ni­(OH) 2 (3640 cm –1 ). , The peak intensity decreased with a feed ratio of Fe, most likely caused by the introduction of Fe into Ni­(OH) 2 , which decreased the intensity of the original NiOH group.…”

Experimental Solubility and Absorption Mechanism of Dilute SO2 in the Binary System of Diethylene Glycol Monomethyl Ether and Dimethyl Sulfoxide

“…8 Therefore, it is necessary to select new efficient, economical, and renewable types of organic solvents. Qiao 9 reported the solubility of SO 2 in trimethylene glycol (TEG) and dimethyl sulfoxide (DMSO), which absorbed about 0.56 g of SO 2 per 1.00 g of solvent. Thus, Shi et al 10 used tetraethylene glycol (TeEG) + DMSO to absorb SO 2 at an absorption of 0.57 g/g.…”