JOURNAL OF CHEMICAL THERMODYNAMICS
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2011
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IF 2.794
Yuanchao Pei,Jing Liu,Zhenning Yan,Zhiyong Li,Jing Fan,Jianji Wang
In this paper, the interactions between cationic dyes and the ionic liquids (ILs) have been studied by 31 P nuclear magnetic resonance (NMR), UV–Vis spectroscopy and conductometric measurements at different temperatures. It was shown that a decrease in the measured specific conductance of the (dye + IL) mixtures was caused by the formation of non-conducting or less conducting (dye + IL) associates. The associates were formed by 1:1 ratio of cation of the cationic dyes and anion of the ILs by using the 31 P NMR and UV–Vis spectroscopy methods. The association constants were calculated by theoretical model based on the deviation from linear behavior, and the association constants were as high as 10 6 (L · mol −1 ) 2 . Thermodynamic results imply that the formation process of association was exothermic nature. It is expected that the associates reported here would have promising application as active materials for the preparation of ion-selective electrode used in the determination of ILs concentrations.
研究领域:
物理化学
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分析化学
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胶体与界面化学
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药物化学
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分子生物学
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Energy Sources Part A-Recovery Utilization and Environmental Effects
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2019
·
IF 0.894
Benyong Han,Jinhe Jiang,Wudi Zhang,Fang Yin,Shiqing Liu,Xingling Zhao,Jing Liu,Changmei Wang,Hong Yang
This study aimed to evaluate the hydrolysis of rapeseed oil using pyrrolidonium ionic liquids as catalysts under atmospheric pressure. The process parameters were optimized using a sequence of experimental protocols to evaluate the effects of ionic liquid loading, dosage of emulsifier, weight ratios of substrates, temperature and time. The results demonstrated that the ranking of catalytic activity of ionic liquids is N-methyl-2-pyrrolidonium hydrogen sulfate salt ([HNMP]HSO4)>1-(3-sulfonic acid) propyl-2-pyrrolidonium hydrogen sulfate salt ([C3SO3Hnhp]HSO4)>2-pyrrolidonium hydrogen sulfate salt ([Hnhp]HSO4). In a batch reactor, the hydrolysis reaction conditions in the presence of [HNMP]HSO4 were investigated and optimized as follows: catalyst loading of 20% (based on the weight of oil), oil/water weight ratio of 1:2, emulsifier loading dosage of 4 wt % (based on the weight of oil), hydrolysis temperature of 100°C, and hydrolysis time of 30 h. The catalytic performance of this ionic liquid remained excellent even after reuse five times.
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Molecular Catalysis
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2026
·
IF 4.3
Shuo Wang,Jing Ding,Yichang Pan,Hui Wan,Guofeng Guan
Chitosan-supported pyridinium ionic-liquid catalysts were prepared. • Halide, DD, and ionic-liquid loading effects were systematically studied. • Br-IL2Cs-90DD gave 95% cyclic carbonate yield at 0.5 MPa CO 2 . • The catalyst retained high activity over five consecutive cycles. • DFT revealed cooperative activation by N⁺, Br⁻, and chitosan –OH sites. Developing recyclable heterogeneous organocatalysts with clearly identifiable cooperative active sites is important for the mild and solvent-free cycloaddition of CO2 with epoxides. Herein, a chitosan-supported pyridinium ionic-liquid catalyst was constructed by covalently immobilizing bifunctional ionic-liquid moieties onto renewable chitosan through Schiff-base chemistry. The catalyst integrates pyridinium cations, Br⁻ nucleophiles, Schiff-base linkages, and chitosan hydroxyl groups into a cooperative heterogeneous catalytic environment. Among the investigated structural variables, the bromide-containing catalyst prepared from high-deacetylation chitosan (Br-IL2Cs-90DD) showed the best performance, affording 96% epichlorohydrin conversion, 99% cyclic carbonate selectivity, and 95% cyclic carbonate yield at 80 °C and an initial CO 2 pressure of 0.5 MPa within 4 h under solvent-free conditions. This performance is competitive with representative heterogeneous ionic-liquid and biomass-supported catalysts operating under mild-pressure conditions. The recovered catalyst retained 94% conversion, 98% selectivity, and 93% yield after five consecutive cycles, and post-reaction FT-IR/XPS characterization further supported the structural retention of the immobilized ionic-liquid catalyst. Characterization and density functional theory calculations support the proposed cooperative catalytic mechanism, in which the pyridinium cation and Br⁻ promote epoxide activation and ring opening, while chitosan hydroxyl groups help stabilize alkoxide and carbonate-related species. This work provides a biomass-derived immobilized ionic-liquid catalyst for metal-free CO 2 -to-carbonate conversion and offers molecular-level insight into cooperative active-site design. Download: Download high-res image (271KB) Download: Download full-size image
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AICHE JOURNAL
·
2025
·
IF 4
Ke Wang,Wei Cao,Kunchi Xie,Shuyun Gu,Siyao Li,Zhiwen Qi,Zhen Song,Zhi Xu
Liquid–liquid interfacial polymerization (IP) serves as a facile method for fabricating covalent organic framework (COF) membranes, while designing task-specific IP systems remains a huge challenge. This work proposes a rational strategy to achieve controlled IP by monomer–catalyst–biphasic solvents matching, integrating thermodynamic predictions and dynamic insights. For the IP engineering, ionic liquids (ILs) are introduced into the biphasic solvent system due to their unique physicochemical properties. Utilizing conductor-like screening model for realistic solvents (COSMO-RS) calculations, deep learning-aided physical properties predictions, and molecular dynamics simulations, 10 promising pairs were identified from 622 candidates. This strategy enables the transition from highly cross-linked amorphous membranes to uniform crystalline membranes with reduced thickness (from 520 to 124 nm), synergizing thermodynamic partition and diffusion regulation. The membranes exhibit increased water permeance (from 0.022 to 7.43 L·m −2 ·h −1 ·bar −1 ) and high antibiotic desalination efficiency. Furthermore, this strategy is successfully extended to other COF membranes, enriching the tuning flexibility of IP system for the development of novel COF membranes.
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AICHE JOURNAL
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2026
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IF 4.4
Chengqi Zhao,Keyi Huang,Zixuan Xu,Qing Zhao,Huiqin Xu,Youting Wu,Mingzhen Shi,Xiaomin Zhang
In this study, aprotic and protic carbonyl-functionalized hydrophobic ionic liquids (CHILs) were designed for the selective separation and conversion of H 2 S. Impressively, [TMACAC][Tf 2 N] exhibited a remarkable H 2 S solubility of 2.286 mol/mol and the H 2 S/CO 2 selectivity of 35.7 at 313.2 K and 1.0 bar H 2 S partial pressure, exceeding all the reported absorbents under experimental conditions. The thermodynamic parameters for the dissolution of H 2 S, CO 2 , and CH 4 in [TMACAC][Tf 2 N] were calculated using variable temperature measurements of solubility and the Krichevsky–Kasarnovsky (K–K) equation. The breakthrough curve verifies the possibility of sequential separation of the components in natural gas. Furthermore, CHILs were used as catalysts for the conversion of H 2 S to thiols or thioethers by α, β-unsaturated carboxylates, and the self-separation of the products and catalysts was realized. Therefore, these CHILs have obvious superior absorption performance and provide a new strategy for desulfurization of natural gas and utilization of separated H 2 S.
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JOURNAL OF SOLID STATE CHEMISTRY
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2026
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IF 3.2
Dijun Zhou,Jianwen Wei,Xuequan Zou,Linlin Geng,Xiaobin Zhou,Lei Liao
Amine scrubbing, while mature for CO 2 capture, suffers from solvent volatility. To address this, we developed a novel solid adsorbent by incorporating low-volatility ionic liquids (ILs), [TEPA][NO 3 ] and [PEHA][NO 3 ], into a hierarchical UiO-66@SBA-15 composite (US). The growth of UiO-66 within the mesochannels of SBA-15 was facilitated by interactions between Zr 4+ and surface Si–OH groups. IL loading dramatically increased the density of amine-based CO 2 adsorption sites. The optimized adsorbent, US-T60, achieved a high CO 2 capacity of 4.73 mmol g -1 at 60 °C under 15% CO 2 /85% N 2 , which is 4.15 times that of the pristine US composite. It also exhibited excellent regeneration stability, retaining 93% of its initial capacity after five cycles. Kinetic analyses indicated a mixed physisorption-chemisorption process, well-described by the Avrami model. In-situ diffuse reflectance infrared Fourier transform spectroscopy (DRIFTS) revealed that CO 2 capture proceeded via two pathways: the rapid formation of ammonium carbamate ion pairs under amine-rich conditions, and the formation of hydrogen-bonded carbamic acid when proton transfer was hindered. Combined with its high capacity, good stability, and tunable adsorption mechanism, this family of IL-incorporated hierarchical composites demonstrates promising potential for application in post-combustion flue gas CO 2 capture.
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TRIBOLOGY LETTERS
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2026
·Vol. 74
·期 2
·34
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IF 3.5
Yang Jing,Liu Xiao,Chen Qiang,Guo Pingxia,Feng Kai,Cai Meirong
As global environmental standards grow increasingly strict, developing eco-friendly, high-efficiency water-based lubrication additives has become a pivotal focus in tribology. In this work, three novel heterocycle-, phosphorus-, and sulfur-free protic ionic liquids (PILs), namely EDG-HA, EDG-OA, and EDG-LA, were successfully synthesized and employed as additives in aqueous lubricant systems with the objective of alleviating the environmental contamination and biological toxicity problems related to conventional lubricant additives. A systematic evaluation of the PILs revealed that lubricants blended with the additives demonstrate significantly superior corrosion protection and lubricating performance when compared to pure water. Specifically, the 1% EDG-LA lubricating solution reduced the friction coefficient (COF) and wear volume (WV) by approximately 69.3% and 94.5%, respectively. By combining quartz crystal microbalance (QCM) adsorption tests and X-ray photoelectron spectroscopy (XPS) analysis, the lubrication mechanisms were clarified: PILs form robust physical adsorption and tribo-chemical reaction film on metal friction pairs, effectively preventing direct metal-to-metal contact. The current research promotes the development of water-soluble additives with potential eco-friendly and high-efficiency through a novel perspective. Graphical
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CHEMICAL RESEARCH IN CHINESE UNIVERSITIES
·
2018
·Vol. 34
·期 2
·279-284
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IF 1.248
Xu Chao,Yin Xuhan,Zhang Chuan,Chen Hongyue,Huang He,Hu Yi
Various imidazolium and choline-based functional ionic liquids(ILs) comprising different cations and anions were grafted onto Burkholderiacepacia lipase(BCL) through surface amino acids coupling. The catalytic ac-tivity, thermostability, organic solvent tolerance and adaptability to temperature and pH changes of the modified BCL were then evaluated in olive oil hydrolysis reaction. The results showed that different combinations of cations and anions in ILs had important influence on the catalytic performance of the modified lipases. BCL modified with IL [Choline][H 2 PO 4 ] was the most improved lipase, in which increases by 1.2 folds in relative activity, 2.5 folds in typi-cal proton solvent(10% methanol, volume fraction), and 1.4 folds in thermostability(after incubation at 70 °C for 2 h) were achieved in relative toits native form. BCL modified with [HOOCEPEG 350 IM][BF 4 ] had higher optimal tempe- rature and pH, and better thermosability compared with the native and other modified BCLs. The conformational changes of BCLs were also confirmed by fluorescence spectroscopy and circular dichroism spectroscopy.
研究领域:
酶工程
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生物催化
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离子液体
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蛋白质修饰
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ACS Sustainable Chemistry & Engineering
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2015
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IF 4.642
Lei Qin,Jianan Zhang,Hongye Cheng,Lifang Chen,Zhiwen Qi,Weikang Yuan
Deodorizer distillate as a byproduct of vegetable oil refining is an important source of natural vitamin E. Simple and green extraction can be employed to recover vitamin E from deodorizer distillate, and its performance strongly relies on the solvent used in the process. In order to screen an imidazolium-based ionic liquid (IL) as entrainer, a methodology integrating theoretical and experimental evaluations was applied. ILs composed of 47 types of anions were first investigated by COSMO-RS to figure out the most promising one, and the effect of the alkyl chain on the imidazolium ring was addressed by experiments. The IL [C6MIm]Ac was finally determined as the most promising solvent with the selectivity of 108.23 and the partition coefficient of 8.182 for α-tocopherol. The liquid–liquid equilibrium data and the extraction result for corn oil deodorizer distillate indicate its superior performance for the extraction process dealing with a low concentration of vitamin E.
研究领域:
分离科学
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绿色化学
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生物化工
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离子液体
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天然产物提取
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JOURNAL OF MOLECULAR LIQUIDS
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2023
·
IF 6
Lanyun Wang,Lingshuang Li,Yongliang Xu,Yao Li,Yan Wang,Tingxiang Chu
In this work, several alkali metal salts, shortened by MBF 4 and CH 3 OOM(MAc, M = Li + , Na + , K + ), were mixed with [Bmim][BF 4 ] or [Bmim][Ac] separately to prepare kinds of hybrid absorbents ( i.e. , [Bmim][BF 4 ]-LiBF 4 , [Bmim][BF 4 ]-NaBF 4 and [Bmim][BF 4 ]-KBF 4 with the same anion of [BF 4 ] - , [Bmim][Ac]-LiAc, [Bmim][Ac]-NaAc and [Bmim][Ac]-KAc with the same anion of acetate) to absorb CO 2 . The results show that the hybrid absorbents based on [Bmim][BF 4 ] has a relatively enhanced absorption effect on CO 2 , while the hybrid absorbent based on [Bmim][Ac] has an inhibitory effect. When a low concentration of MBF 4 was applied, LiBF 4 -[Bmim][BF 4 ] shows higher CO 2 capacity than NaBF 4 -[Bmim][BF 4 ] and KBF 4 -[Bmim][BF 4 ] solutions. With the concentration of MBF 4 increase, NaBF 4 -[Bmim][BF 4 ] and KBF 4 -[Bmim][BF 4 ] become more favorable for CO 2 absorption, which also appeared in the MAc-[Bmim][Ac] systems. According to the MD simulation results, Na + and K + have stronger attraction forces with CO 2 , and Na + is easier to make the [BF 4 ] - anions to aggregate around it. According to the MD calculations, for the [Bmim][BF 4 ]-MBF 4 hydrid systems, Na + has the weakest ability to aggregate and form M + layer hindering the contact of CO 2 and anion. Combining with its strongest ability to attract the [BF 4 ] - anion, a largest space of [Bmim][BF 4 ] to accomodate more CO 2 molecules is created. In comparison, for the physical–chemical absorbent [Bmim][Ac], the strong M + aggregation and [Ac] - attraction by M + are the main reasons for the decreased CO 2 capacity, due to the reduced number of [Ac] - responsible for the chemically binding with CO 2 during absorption.
研究领域:
环境化学
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材料科学
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碳捕集与封存
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离子液体研究
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CHEMICAL ENGINEERING SCIENCE
·
2022
·
IF 4.889
Jian Chen,Zengxi Li,Youbing Zhu,Hongyan Wang,Hui Wang
Oligomerization is one of the efficient routes for making use of C4 olefins to produce high value-added chemicals. However, high reagent conversion is usually accompanied by low dimer product selectivity, and vice versa. Ionic liquids (ILs) with intense interaction between Lewis and Brønsted acidic sites were demonstrated to be excellent catalysts for butene oligomerization. Furthermore, it was found that eutectic IL could be formed by strong hydrogen bond when alcohol was added to the IL, which exhibited enhanced butene solubility and thus improved catalytic performance. Moreover, microemulsion could be constructed by adding an IL emulsifier into the IL catalyst, and the improved interfacial area further enhanced efficient contact between butene and catalyst. Combining the strategies of employing dual-site eutectic IL as the catalyst and microemulsion formation, butene conversion could reach 98%, while dimer selectivity was 91%, resolving the contradiction that high conversion and target product selectivity cannot be achieved simultaneously.
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ENERGY
·
2023
·
IF 9
Fa-Ping Liu,Ai-Rong Li,Cheng Wang,Yu-Ling Ma
The complex kinetic process of CO 2 hydrate formation limits its applications of CO 2 capture and sequestration et al. In this work, the effects of metal-based ionic liquids with different cations and anions on CO 2 hydrate nucleation and growth was studied. The results showed that CO 2 hydrate nucleation was promoted by the anions of [NiCl 3 ] - , [MnCl 3 ] - , [FeCl 4 ] - , [C 8 MIM] + and [C 16 MIM] + ions due to the enhancement of local hydrogen-bonding network to construct crystal nuclei. The induction time of CO 2 hydrate nucleation was decreased by 75.0% in the [C 16 MIM]FeCl 4 aqueous solution. However, CO 2 hydrate nucleation was inhibited by [C 2 MIM] + and [ZnCl 3 ] - anion. The gas storage capacity of CO 2 hydrate was increased by mass transfer channels around the metal complex anions which could accelerate the diffusion rate of H 2 O and CO 2 molecules. The co-effect between [C 16 MIM] + cations and [FeCl 4 ] - anions on CO 2 hydrate growth was the strongest, which increased gas storage capacity by 16.1%. Hence, CO 2 hydrate formation can be controlled and tuned by changing cations and anions of metal-based ionic liquids.
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