SEPARATION AND PURIFICATION TECHNOLOGY
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2016
·
IF 3.299
Chenglong Shi,Yan Jing,Jiang Xiao,Xingquan Wang,Ying Yao,Yongzhong Jia
Two non-fluorinated ionic liquids (ILs), namely tetrabutylammonium bis(2-ethylhexyl)-phosphate, [N 4444 ][DEHP], and tetraoctylammonium bis(2-ethylhexyl)-phosphate, [N 8888 ][DEHP], were synthesized and fully characterized by 1 H and 13 C NMR spectroscopy. These functionalized ILs were subsequently evaluated in terms of their ability to extract lithium ions from aqueous solution. The extraction efficiencies of these functionalized ILs for lithium ions were measured as a function of various extraction parameters, including aqueous acidity, temperature and extractant concentration. The extracted species were determined using a slope analysis method, which indicated that the ILs formed a 1:1 (metal:ligand) complex. Fourier transform infrared spectroscopy studies were conducted to better understand the nature of the extracted species. We also investigated the stripping of the lithium ions from the organic phase and the re-use of the ionic liquid in a subsequent extraction step.
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JOURNAL OF MOLECULAR LIQUIDS
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2016
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IF 2.74
Zhen Song,Qian Zeng,Jinwei Zhang,Hongye Cheng,Lifang Chen,Zhiwen Qi
When applying ionic liquids (ILs) in extractive and oxidative desulfurization of fuel oils, the potential solubility of IL in fuel phase is an important concern whereas research particularly on this issue is still scarce. In this work, COSMO-RS was first employed to predict the solubilities of 220 imidazolium-based ILs (11 cations and 20 anions) in 7 model fuel hydrocarbons (namely, n -hexane, n -heptane, n -octane, i -octane, cyclohexane , benzene and toluene), which cover different characters of ILs and hydrocarbons. To understand the effect of IL and hydrocarbon on the IL-in-hydrocarbon solubility, different types of molecular interactions between IL and hydrocarbon were further analyzed from COSMO-RS point of view. Finally, the solubilities of 5 representative ILs in the studied hydrocarbons were experimentally determined by nitrogen analyzer, demonstrating the good qualitative and acceptable quantitative ability of COSMO-RS for predicting IL-in-hydrocarbon solubilities.
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CHEMICAL ENGINEERING RESEARCH & DESIGN
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2017
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IF 2.538
Yunchang Fan,Xiaojing Li,Lufei Song,Jing Li,Lei Zhang
In this work, a series of hydrophobic ionic liquids (ILs) with ClO 4 − , BF 4 − , PF 6 − , CF 3 SO 3 − and bis(trifluoromethanesulphonyl)imide (NTf 2 − ) as anions were synthesized. Their extraction ability for the two alkaloids, quinine and gramine was studied. The experimental results suggested that the extraction ability of ILs had no clear relationship with the alkyl chain length on the IL cation but depended on the hydrophobicity and hydrogen-bonding strength of the IL anion. The CF 3 SO 3 − -based ILs were stable against hydrolysis and exhibited better extraction ability for the two alkaloids. Thermodynamic analysis suggested that the extraction of the two alkaloids was an entropy-driven process. These results indicate that CF 3 SO 3 − -based ILs are ideal solvents for recovering alkaloids from the water phase.
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JOURNAL OF MOLECULAR LIQUIDS
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2016
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IF 2.74
Runping Wang,Yuena Chang,Zhijian Tan,Fenfang Li
Phase diagrams of a series of ionic liquid-based aqueous biphasic systems (ILABS) composed of novel choline amino acid ionic liquids and inorganic salts were measured experimentally at T = (288.15, 298.15 and 308.15) K. Ionic liquids, salts, and temperature influenced the phase separation ability of the studied ILABS. Several parameters of the Merchuk equation were estimated by fitting the binodal curve data. Liquid-liquid equilibria of the investigated ILABS were determined by a gravimetrical method, including the tie-line lengths and slope of the tie-lines. Critical points of the corresponding ILABS were obtained by a mathematical calculation different from the conventional extrapolation. In the case of the phenylalanine + K 3 PO 4 + H 2 O system at 298.15 K, the gravimetrical method and the mathematical calculation were validated by the tie-lines determined experimentally and the critical point derived from the extrapolation.
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CHINESE JOURNAL OF POLYMER SCIENCE
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2016
·Vol. 35
·期 1
·54-65
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IF 1.811
Chen Qi-jing,An Ze-sheng
A series of well-defined core cross-linked star (CCS) polymeric ionic liquids (PILs) were synthesized via a three-step approach. First, the styrenic imidazole-based CCS polymer (S-PVBnIm) was prepared by the RAFT-mediated heterogeneous polymerization in a water/ethanol solution, followed by the quaternization of S-PVBnIm with bromoalkanes and anion exchange. The CCS polymers were characterized by gel permeation chromatography (GPC), nuclear magnetic resonance (NMR) spectroscopy, Fourier transform infrared spectroscopy (FTIR), thermal gravimetric analysis (TGA), and differential scanning calorimetry (DSC). The obtained CCS polymers were used as the effective emulsifiers for oil-in-water high internal phase emulsions (HIPEs). Multiple oils with different polarity including n -dodecane, undecanol, toluene and octanol were emulsified using 0.5 wt% S-PVBnIm aqueous solution under the acidic condition to form HIPEs with long-term stabilities. The excellent emulsification properties of CCS PILs were demonstrated by HIPE formation for a variety of oils. The properties of HIPEs in terms of emulsion type and oil droplet size were characterized by the confocal laser scanning microscopy (CLSM). The intriguing capability of CCS PILs to stabilize HIPEs of various oils holds great potentials for the practical applications.
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TRIBOLOGY INTERNATIONAL
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2016
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IF 2.259
Lili Zhu,Gaiqing Zhao,Xiaobo Wang
In this study, three oil-soluble phosphonium-based ionic liquids (ILs) were synthesized and then investigated them as potential lubricating additives. The friction-reduction and antiwear performances of the ILs as lubricant additives in pentaerythritol oleate (PETO) and trimethylolpropane trioleate (TMPTO) were evaluated on an Optimol SRV-IV oscillating reciprocating friction and wear tester. The results indicated that tetradecyltrihexylphosphonium O,O′-diethyldithiophosphate (IL3=TTP−DDP) exhibited considerably better lubrication properties than commercially available tricresyl phosphate (TCP) by performing very well at 200 °C. SEM and XPS were performed to analyze the worn surfaces and revealed the fabrication of tribofilm composed of Fe(OH)O, Fe 3 O 4 , FePO 4 and FeSO 4 , which played a crucial role in the excellent lubricating behaviours of the ILs-additived lubricants.
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Drug Delivery and Translational Research
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2024
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IF 5.7
Li Yang,Yu Qin,Lu Yi,Ma Yanyun,Qi Jianping,Chen Zhongjian,Zhu Quangang,Wu Wei
Psoriasis is a prevalent chronic disease affecting 2–3% of the global population. Cyclosporine A (CyA) has been widely used with great promise in the treatment of moderate to severe psoriasis despite various side effects associated with its systemic administration. Topical administration of CyA circumvents systemic side effects; however, the poor water solubility and large molecular weight of CyA pose challenges for dermal delivery. In this study, choline-based ionic liquids (ILs) were used to enhance the dermal delivery of CyA for the potential treatment of psoriasis. All four ILs tested significantly improved the solubility of CyA, which was greater than that of the control group with dimethyl sulfoxide (DMSO) as a solubilizer (20%, w/w). The saturated solubility of CyA in two of the ILs, choline geranate ([Ch][Ge]) and choline ricinoleate ([Ch][Ra]), reached more than 90 mg/mL, and the solubilization capability of the ILs except [Ch][Ci] was resistant to water dilution. The negligible change in CyA content determined by high-performance liquid chromatography and the secondary structure detected by circular dichroism spectroscopy confirmed the stability of CyA in the ILs. At 4 h in the in vitro penetration test, the amount of CyA retained in the skin in the IL groups was slightly greater than that in the control group (20% DMSO). The water content of the ILs significantly affected their penetration ability. When the water content increased from 10 to 70%, the dermal delivery of CyA first increased, peaked at a water content of 30%, and then decreased. The dermal delivery ability of [Ch][Ge] and [Ch][Ra] with a water content of 70% was still comparable to that of 20% DMSO. Moreover, CyA-loaded ILs (0.5%, w/w) significantly relieved the symptoms of psoriasis in an imiquimod (IMQ)-induced mouse model, and the levels of inflammatory factors, including tumor necrosis factor α, interleukin 22 and interleukin 17, in the affected area were reduced by 71.7%, 75.6%, and 89.3%, respectively. The IL tested, choline sorbate ([Ch][So]), showed low cytotoxicity to human immortalized epidermal cells (HaCaT). After 7 days of consecutive application, [Ch][So] did not cause significant irritation. In conclusion, ILs demonstrate promising potential for the dermal delivery of CyA for the treatment of psoriasis. Graphical Abstract
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PubMed
高影响因子
MACROMOLECULAR CHEMISTRY AND PHYSICS
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2024
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IF 2.5
Feng-Tao Zheng,Ke Su
An imidazolium-type room-temperature ionic liquid containing silsesquioxane frameworks is successfully prepared. The polar ionic liquid products are grafted onto the surface of prepared aromatic polyamide (PA) membranes to improve water flux of PA membranes. Membranes grafted with an ionic liquid exhibit a water flux of 1.89 L m −2 h −1 bar −1 ), 48% higher than that of pure PA membranes while the salt rejection still remains at 96%. This improvement can be attributed to the enhanced hydrophilicity of the membrane surface, as evidenced by the reduced water contact angle.
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CATALYSIS LETTERS
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2017
·Vol. 147
·期 7
·1654-1664
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IF 2.799
Xu Fei,Cheng Weiguo,Yao Xiaoqian,Sun Jian,Sun Wei,Zhang Suojiang
Abstract A series of thiourea-based ionic liquids (TBILs) were developed as efficient catalysts for the synthesis of cyclic carbonates by the cycloaddition of CO 2 with epoxides under metal-, cocatalyst- and solvent-free conditions. Different substituted groups including electron donating and withdrawing groups were introduced onto the para-position of the aromatic ring in cation of TBILs. The effect of the catalyst structures on the reaction activity was systematically investigated. Among the ionic liquids, TBIL3 with substituted OCH 3 group showed the best performance with 99% propylene oxide conversion as well as 99% propylene carbonate selectivity under mild conditions (1.5 MPa, 130 °C and 3 h) without any co-solvent. It was demonstrated that two secondary amine groups of the thiourea unit could dually activate the epoxides and CO 2 and have a synergetic effect with the halide anion. Graphical Abstract
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Journal of CO2 Utilization
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2017
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IF 4.292
Yingjie Xu
Recently, chemical fixation of CO 2 catalyzed by protic ionic liquids (PILs) has been successfully achieved, suggesting that CO 2 absorption behavior plays an important role on CO 2 activation and transformation. For this reason, the influence of the alkalinity and physicochemical properties on CO 2 absorption behavior of four azole-based PILs, namely [DBNH][Pyr], [DBNH][Im], [DBUH][Pyr], and [DBUH][Im] was discussed in this work. The alkalinity of PILs was determined by potentiometric titration, and free space of PILs was evaluated by thermal expansion coefficient and refractive index. Solubility parameter of PILs was obtained from the activation energy for viscous flow. The results show that PILs with [Pyr] − exhibits stronger alkalinity and larger free space, which can help to improve CO 2 capture capacity. Whereas PILs with larger cation size [DBUH] + exerts higher viscosity, resulting in slower absorption rate of CO 2 . Furthermore, the CO 2 absorption capacity is inversely proportional to the solubility parameter of PILs. The absorption mechanism proved by FT-IR and 13 C NMR spectra indicates that [Pyr] − or [Im] − can react with CO 2 to form carbamate. Accordingly, considering the CO 2 capture capacity and absorption rate, [DBNH][Pyr] may be a good candidate for efficient CO 2 capture and activation with low enthalpy of absorption of −38.2 kJ mol −1 .
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WEAR
·
2024
·
IF 5.3
Mingyuan Dou,Qing Feng,Jing Yang,Shuai Zou,Kangchun Li,Zhenpeng Li,Maoli Yang,Fuchuan Huang
With the increasing average lifespan of human beings, the wear and tear caused by daily activities on joints will also escalate. Consequently, there is a growing focus on the development of green, environmentally friendly, and biocompatible non-toxic lubricating materials. The presence of dual chemical active centers in natural amino acids results in anions and cations that lead to precipitation and poor lubrication effects in traditional choline amino acid ionic liquids . In this study, nine types of choline acetyl-amino acid ionic liquids ([Ch][Ac-AA]ILs) were synthesized using acetylated amino acids (Ac-AA) as anions and choline (Ch) as cations. The physicochemical properties and tribological behavior of [Ch][Ac-AA]ILs at different frequencies were evaluated. The results demonstrated that [Ch][Ac-AA]ILs exhibited excellent tribological properties and maintained effective lubrication even under high-frequency friction conditions compared to sodium hyaluronate (HA-T). This performance was attributed to the carbon chain length and functional group composition of [Ch][Ac-AA]ILs' anions. Energy dispersive spectroscopy and X-ray photoelectron spectroscopy analysis revealed that the superior lubrication performance of [Ch][Ac-AA]ILs was associated with the formation of chemical reaction films and physical adsorption films on the surface of friction pairs . This research enriches our understanding of [Ch][AA]ILs-based lubrication systems while providing valuable insights for selecting joint lubricants suitable for different activity frequencies.
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APPLIED CATALYSIS B-ENVIRONMENTAL
·
2024
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IF 20.2
Jiawei Ruan,Lifang Chen,Xinzi Wu,Shaokang Qian,Kunchi Xie,Xiaoyi Zhang,Hongye Cheng,Zhen Song,Zhiwen Qi
Direct synthesis of dimethyl carbonate (DMC) from CO 2 is promising for CO 2 utilization, however its efficiency remains far from industrial-scale implementation for lack of customized catalysts. Herein, a hydroxyl-functionalized ionic liquid (HFIL) was developed to enhance catalytic activity, and importantly, to facilitate IL recovery through spontaneous phase separation. A high DMC yield (6.5 g DMC ·kg cat −1 ·h −1 ) over HFIL was achieved under mild conditions compared to non- hydroxyl IL. Self-diffusion coefficients characterization revealed intensified diffusion of CH 3 OH and HFIL, alongside reduced blockage of active sites after hydroxyl functionalization. Density functional theory calculations elucidated that cation polarization induced by hydroxyl group facilitated the synergistic activation of both substrates and monomethyl carbonate intermediate. The reaction mechanism was further verified through diffuse reflectance infrared Fourier transform spectroscopy and theoretical calculations. The self-separation behavior was demonstrated by molecular dynamics simulations. The deep insights into hydroxyl effects towards direct DMC synthesis provide a pioneering perspective for CO 2 capture and utilization using functionalized ILs.
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危险品化学品经营许可证（带存储）