JOURNAL OF MOLECULAR LIQUIDS
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2024
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IF 5.3
Jintao He,Junyuan Hua,Xiaohua Ma,Ranil Wickramasinghe,Jianxin Li
Efficient extraction of Cs + from aqueous solution was investigated by liquid–liquid extraction based on ionic liquids (ILs). In this study, Di(aminobenzo)-18-crown-6 (DAB18C6) was used as the extractant and three ILs (1-butyl-3-methylimidazolium hexafluorophosphate ([C 4 mim][PF 6 ]), 1-hexyl-3-methylimidazolium hexafluorophosphate ([C 6 mim][PF 6 ]), and 1-butyl-3-methylimidazolium bis-trifluoromethyl sulfonamide ([C 4 mim][NTf 2 ])) were employed as co-extractants in the construction of a liquid–liquid extraction system for efficient and selective extraction of Cs + from aqueous solutions. It was demonstrated that the DAB18C6-[C 4 mim][NTf 2 ] mixed solvent system at 0.12 mol/L DAB18C6, a mass ratio of ILs/CHCl 3 of 1:4 and a volumetric ratio of O/A of 1:1 exhibited a high % extraction of Cs + up to 99.94 %, with a higher selectivity for Cs + relative to coexisting ions such as K + ( β Cs/K = 1216.7) and Rb + ( β Cs/Rb = 139.03). The high selectivity of the extraction system for Cs + was attributed to the lower hydration binding energy of Cs + (−366.51 kJ/mol) and the stronger interaction between DAB18C6 and Cs + , g(r) = 12.7. Further, the hydrogen bonding interaction between the amino crown ether and ionic liquid increases the viscosity and surface tension of the extraction system, thus enhancing the stability of the system. Noteworthy, the most stable structure formed by DAB18C6-Cs + -[NTF 2 ] − is attributed to cation exchange. In summary, this study demonstrates the great potential for efficient separation and extraction of cesium from aqueous solutions.
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INTERNATIONAL JOURNAL OF BIOLOGICAL MACROMOLECULES
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2024
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IF 7.7
Shaochen Xu,Chao Jiang,Tao Yu,Kai Chen
Diabetic wound (DW) is a multifaceted challenge, characterized by persistent bacterial infections and compromised angiogenesis. To address these issues and enhance DW healing, we developed a novel strategy using a photo-crosslinked hydrogel system composed of ionic liquids (ILs) and gelatin methacryloyl (GelMA) loaded with resveratrol (Res). The ILs/GelMA hydrogel was fabricated via a simple photo-crosslinking process, resulting in desirable mechanical properties, biocompatibility, and controlled release kinetics. Res was incorporated into the hydrogel matrix (ILs/GelMA@Res) to ensure sustained release, facilitating angiogenesis and accelerating wound healing. In vitro studies demonstrated that the ILs/GelMA@Res hydrogel exhibited potent antibacterial activity against Staphylococcus aureus and Escherichia coli , inhibiting bacterial growth and biofilm formation. Furthermore, the sustained release of Res from the hydrogel promoted angiogenesis by activating the PI3K/AKT signaling pathways associated with VEGF and FGF, enhancing endothelial cell proliferation, migration, and tube formation. In a DW mice model, the ILs/GelMA@Res hydrogel demonstrated accelerated wound closure, reduced inflammation, and robust neovascularization. This multifunctional hydrogel-based delivery system holds considerable potential for clinical translation, offering a safe and effective treatment modality for diabetic patients with chronic wounds.
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FOOD CHEMISTRY
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2017
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IF 4.529
Hongpeng Yang,Li Chen,Cunshan Zhou,Xiaojie Yu,Abu ElGasim A. Yagoub,Haile Ma
Polyethylene glycol (PEG) is widely used in the polymer-salt systems. However, the low polarity of the PEG-rich phase limits the application of aqueous biphasic systems (ABS). To overcome this disadvantage, a small quantity of ionic liquid (IL) was used as an adjuvant in ABS to enlarge the polarity range. Therefore, an innovative study involving addition of 4 wt% imidazolium-based ILs to the PEG 600/NaH 2 PO 4 ABS, aiming at controlling the phase behavior and extraction ability, was carried out. The phase diagrams, the tie-lines and the partitioning behavior of l -phenylalanine and ILs were studied in these systems. The results reveal that l -phenylalanine preferentially partitions for the PEG-rich phase. The addition of 4 wt% IL to ABS controls the partitioning behavior of l -phenylalanine, which depends on the type of IL employed. Moreover, it is verified that increasing temperature lead to a decrease in the partition coefficient of l -phenylalanine.
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RENEWABLE ENERGY
·
2024
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IF 9
Xianfeng Guan,Di Yu,Yu Luo,Shuyu Zhang,Wanzhen Wu,Xu Feng,Tongtong Gao,Wenyu Bai,Shuang Wang
Amino-type polybenzimidazole is prepared, then ionic liquid with three nitrogen positive sites ([CTDTr]Br 3 ) is polymerized into polymeric ionic liquids (PILs) by in-situ radical polymerization, and AmPBI-CTDTr-P x membranes were prepared by piperidinium (PPd) and [CTDTr]Br 3 combination to cross-linked with AmPBI. Following treatment with KOH and phosphoric acid (PA), the ion pairs (N + - H 2 PO 4 − ) generated in the composite membrane system can enhance proton conductivity and facilitate proton transport. The AmPBI-CTDTr-P x membranes shown exceptional PA retention as a result of the alkaline properties of both [CTDTr]Br 3 and PPd, which can engage in acid-base interactions with phosphoric acid. Specifically, the proton conductivity of AmPBI-CTDTr-P 5 at 180 °C is 129.7 mS cm −1 , which is 2.52 times that of pure membranes. Acid retention of AmPBI-CTDTr-P 5 at 80 °C/40 % RH and 160 °C are 64.4 % and 84 %.
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NEW JOURNAL OF CHEMISTRY
·
2024
·Vol. 48
·期 7
·3221-3231
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IF 2.7
Yafei Shi,Haiyue Wang,Qiao Zhou,RongRong Zheng,Liying Guo
Six dual active site ionic liquid catalysts were prepared by using triethylenediamine-grafted 1-bromotetradecane as a cation and coordinating with different organic anions. The structures and properties of the catalysts were characterized using Fourier transform infrared spectroscopy (FT-IR), nuclear magnetic resonance (NMR) spectroscopy, and thermogravimetric analysis (TGA). The synthesis of poly(isosorbide carbonates) (PICs) via the transesterification polycondensation of dimethyl carbonate (DMC) and isosorbide (ISB) catalyzed by a cation and anion was studied. A single factor experiment was used to investigate optimal process parameters. FT-IR, NMR, TGA, and differential scanning calorimetry (DSC) were adopted to characterize the structures and properties of PICs. The results showed that under the same process parameters, the catalyst using imidazole as an anion had the best catalytic performance. Under optimal process conditions, the conversion of ISB reached 98.82%, the weight average molecular weight of the PIC reached 28 840 g mol−1, and the glass transition temperature (Tg) of the PIC was 149 °C.
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CHEMICAL ENGINEERING JOURNAL
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2024
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IF 13.3
Zhaoyan Zhang,Shaoping Qian,Xinyu Li,Changfa Zhu,Zhijie Li
Polylactic acid (PLA) is one of the most promising biodegradable materials, but poor toughness severely limits its application. Ionic liquids (ILs) have excellent plasticizing effects on PLA, but strength reduction and plasticizer precipitation remain worrisome. Herein, nanofibrillated cellulose (NFC), with excellent morphology, high modulus and strength, was prepared to reinforce PLA plasticization systems. Moreover, its numerous surface hydroxyl groups were tailored to bond with ILs, reducing plasticizer precipitation. The different sulfonation degrees of NFCs (low LSNFC, medium MSNFC, high HSNFC) and the influence of NFC amounts (0–7 wt%) on the mechanical, thermal and plasticizer precipitation properties of PLA composites were investigated. The results indicate that network-like C2/C3-sulfonated NFCs were successfully prepared through simple processing steps. Noteworthy, the tensile elongations of PLA composites increased with the addition of IL-XSNFC (all three degrees), with no significant reduction in tensile strength and modulus. The addition of 7 wt% IL-HSNFC resulted in an elongation of 25.01 % for PLA composites, which is 3.6 times that of pure PLA. Adding 3 wt% IL-MSNFC achieved ultra-high impact toughness of 3.19 kJ/m 2 , nearly double that of pure PLA. Interestingly, with increasing sulfonation degree, the amount of ILs precipitation in PLA composites significantly decreased. The precipitation rate of the PLA composite with IL-HSNFC is only 24 % of the counterparts with IL-NFC. This work presents an innovative method to improve interface compatibility, providing a new strategy to reduce plasticizer precipitation and broaden the application scope of PLA.
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INTERNATIONAL JOURNAL OF BIOLOGICAL MACROMOLECULES
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2024
·
IF 7.7
Lili Xu,Qi Qi,Huanruo Liu,Qi Li,Xinyue Geng,Xiangnan Liu,Shu Chen,Xuekun Wang,Hongbo Suo
Modifying the carrier interface is a promising method to improve the microenvironment of immobilized enzymes and enhance their activity and stability. In this work, using proline as amino acid , magnetic metal-organic frameworks (MOFs) were modified with an amino-acid-based ionic liquid (AAIL) with two hydroxyl groups followed by adsorption of porcine pancreatic lipase (PPL). The activity recovery of the prepared immobilized lipase (MMOF-AAIL/PPL) was up to 162 % higher than that of MMOF-PPL (70.8 %). The Michaelis constant of MMOF-AAIL/PPL was 0.0742 mM lower than that of MMOF-PPL, but the catalytic efficiency was 0.0223 min −1 which was higher than MMOF-PPL. Furthermore, MMOF-AAIL/PPL maintained 85.6 % residual activity after stored for 40 days and its residual activity was 71.9 % while that for MMOF-PPL was 58.8 % after incubated in 6 M urea for 2 h. Particularly, after ten consecutive cycles, the residual activity of MMOF-AAIL/PPL still reached 84.4 %. In addition, the magnetic properties of the support facilitate the separation process which improves the utilization efficiency of immobilized enzymes.
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Journal of Environmental Chemical Engineering
·
2024
·
IF 7.4
Xiao Zhu,Shuhui Liu,Ruhui Shang,Xin Chen,Yingjie Xu,Yujun Guo,Baoping Ling
Three novel anion-functionalized proton ionic liquids (ILs) were prepared from superbase 1,5-diazabicyclic [4.3.0]non-5-nonene (DBN) and 2-hydroxypyridine (2-OP), 3-hydroxypyridine (3-OP) and 4-hydroxypyridine (4-OP). Then application of ILs in the CO 2 absorption have been investigated and the effects of temperature, pressure and humidity on the absorption properties of ILs were also studied. Experimental results demonstrated that such ionic liquids can exhibit outstanding reversibility and high CO 2 capacity at room temperature . In order to reveal the influence of position of substituents in anion on the absorption behavior, the physicochemical properties including density ( ρ ), viscosity( η ), and speed of sound ( u ) were measured at T = 298.15–328.15 K, which were used to calculate the molecular volume ( V m ), standard entropy ( S 0 ), lattice energy ( U POT ), isentropic compressibility coefficient ( κ s ) and thermal expansion coefficient ( α p ) of the pure ionic liquids at different temperatures. The results showed that [DBNH][2-OP] with O atom located in the ortho position of N atom appeared lower viscosity and larger free volumes as well as stronger alkalinity , which can endow it excellent CO 2 capture capacity of about 1.4 mol CO 2 /mol IL (about 0.3 g CO 2 /g IL) at 30 ºC. Based on quantum chemical calculation and 13 C NMR as well as FT-IR spectra, the chemical absorption mechanisms of the two active sites was proposed. These results provide important insights into effective strategies for CO 2 capture.
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MICROPOROUS AND MESOPOROUS MATERIALS
·
2025
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IF 4.7
Xiao Dan Sun,Dawei Feng,Jia Xu,Xue Gao,Kai Yan,Zhenhua Tian
Zwitterionic poly(ionic liquids) (ZPILs) were used as a combination tanning agent to enhance the absorption of chromium tanning agent and dyes simultaneously, which is crucial and challenging during the tanning process. Mesoporous silica (MCM-48) with a size of ∼70 nm was introduced as a nanotainer to adsorb photoinitiator and a small quantity of methylacrylic acid (MAA), and then ILs monomer and MAA were added and they started to polymerize in the pores of MCM-48, which could avoid the gelation of ZPILs in aqueous solution. In this way, the obtained nanocomposites (M48/PMIL) had a smaller size (200–500 nm) and good fluidity, so they were suitable to use as tanning agent. The addition of M48/PMIL made the shrinkage temperature and thickness rate of leather increase by 5.5 °C and 22 % than Cr-tanned leather, respectively. Meanwhile, mechanical properties are also improved further. Moreover, the Cr 2 O 3 content in tanning liquor decreased by 28.8 %, and the anionic dye absorption rate enhanced by 7.9 %, respectively, due to the good permeability and the presence of zwitterion in M48/PMIL. This novel tanning agent exhibits a potential application in less chromium tanning and decreases the Cr 3+ and dye content in tanning liquor.
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JOURNAL OF CHROMATOGRAPHY A
·
2019
·
IF 3.858
Siru Ren,Song Xue,Xiaodong Sun,Mengjie Rui,Li Wang,Qi Zhang
In this work, tetraalkylammonium amino acid ionic liquids (TAA-AAILs) were first applied to non-aqueous capillary electrophoresis (NACE) to establish synergistic systems with a conventional chiral selector, native β-cyclodextrin (β-CD). Excellent enantioseparations of some dansyl-amino acid (Dns-AA) samples were achieved. A series of comparison experiments and a molecular docking study were performed to validate the synergistic effect of TAA-AAILs and β-CD in NACE. Several interesting results were observed compared with previously reported chiral ILs-related aqueous CE studies. In particular, the direct enantioselectivity of TAA-AAILs was observed for the first time by using it as sole chiral selector in NACE. This was an encouraging finding because it was the first direct and convincing evidence that AAILs were able to participate in the enantiorecognition process in the conventional chiral selectors-based synergistic systems. The new TAA-AAILs synergistic NACE system was further optimized in terms of alkyl chain length, TAA-AAILs concentration, β-CD concentration, electrolyte composition and applied voltage, etc. Best enantioseparations of Dns-AAs were obtained when 100 mM β-CD and 10 mM tetramethylammonium- l -arginine (TMA- l -Arg) were added in an NMF buffer containing 50 mM Tris and 35 mM CA (apparent pH 7.85) under UV detection. The applied voltage was set at 30 kV. The method was then successfully employed for the determination of enantiomeric impurities of a real AA sample. This work proved that the use of chiral ILs as additives in NACE is a promising approach for enantioseparation.
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THERMOCHIMICA ACTA
·
2025
·
IF 3.5
Hui-Sheng Peng
To reveal the relationship between anion structure and thermal decomposition property, an experimental system integrating comprehensive thermal analysis and Fourier-transform infrared spectroscopy is constructed to investigate the thermal decomposition mechanisms of four 1-ethyl-3-methyl imidazolium-based ([EMIM] + ) ionic liquids with anion structures of thiocyanate ([SCN] - ), dicyanamide ([DCA] - ), tetrafluoroborate ([BF 4 ] - ), and bis(trifluoromethylsulfonyl)imine ([NTF 2 ] - ). Results show that the thermal stability follows the order of [EMIM][NTF 2 ] > [EMIM][BF 4 ] > [EMIM][DCA] > [EMIM][SCN] by decomposition temperature. Spectrum analyses reveal that the anion structures are thoroughly disrupted, forming different gas products, while the cation structure only undergoes substitution and elimination reactions on the imidazole ring. Due to the differences in anion structure, methyl isothiocyanate, trifluoromethanesulfonamide and sulfur dioxide, ammonia, and boron trifluoride are found as key products during the decomposition of [EMIM][SCN], [EMIM][NTF 2 ], [EMIM][DCA], and [EMIM][BF 4 ], respectively. Following designs of anion structure for propellant may start from [SCN] - and [DCA] - to obtain better decomposition property.
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FOOD CHEMISTRY
·
2017
·
IF 4.529
Shuya Wang,Ziwei Yang,Na Peng,Jun Zhou,Xiaoyu Yong,Haoran Yuan,Tao Zheng
Ionic liquids-based microwave-assisted hydrolysis was successfully applied for hydrolysis of puerarin and daidzein derivatives from Radix Puerariae Lobatae extract. The ionic liquids with different cations and anions have been investigated, and [Omim]HSO 4 was selected as catalyst. In addition, the hydrolysis parameters, including catalyst quantity, ionic liquids concentration, microwave power and microwave time, were optimized by Response Surface Methodology. The optimal conditions were as follows: 0.82 mol/L [Omim]HSO 4 ; catalyst quantity, 1.42 mL; microwave time, 7 min; microwave power, 400 W. Under those condition the average hydrolysis efficiency of puerarin and daidzein derivatives was 57.93 ± 3.08%. Compared with the traditional acidic catalysts, the [Omim]HSO 4 exhibited higher efficiency, which demonstrates that ionic liquids-based microwave-assisted hydrolysis was a rapid, efficient, and simple hydrolysis technique.
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