Materials Today Energy
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2024
·
IF 9
Zehua Yu,Peng Cheng,Tenghui Qiu,Xifan Fu,Yang Yu,Peihua Yang,Kang Liu
The osmotic heat engine (OHE) stands out as a promising approach for converting low-grade heat into electricity owing to its scalability. However, challenges arise from the substantial latent heat consumption or the restricted concentration difference during the regeneration stage, constraining improvements in energy efficiency and power density. Here, we introduce an isotonic separation process to a thermal-responsive ionic liquid (IL)-based OHE system, where the water-rich phase of the IL after phase transition is further filtrated into pure water and another part of the IL-rich phase with constant osmotic pressure. This isotonic process amplifies the net energy generated in the mixing process. Ultimately, a state-of-the-art Carnot-relative efficiency of 48% is achieved within a temperature difference of 25–40 °C, where the hot side is maintained at 60 °C. Additionally, a forward-osmosis device yields an exemplary peak power density of 10.9 W/m 2 .
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ANALYTICA CHIMICA ACTA
·
2024
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IF 5.7
Tao Sun,Mengyi Ba,Yanli Song,Wen Li,YuanYuan Zhang,Zhiqiang Cai,Shaoqiang Hu,Xianming Liu,Donatella Nardiello,Maurizio Quinto
Background Gas chromatography is worldwide recognized as one of the most important analytical techniques, due to its high versatility and reliability. The heart of a gas chromatograph is the column, that allows analyte peak separations and, consequently, accurate qualitative and qualitative analyses. New and more efficient columns are always requested to satisfy new and challenging analytical needs. Results In this work, imidazolium ionic liquids functionalized pillar [5] arenes have been used for the first time as gas chromatographic stationary phases , considering their highly symmetric pillar-shaped architecture with cavities rich in π -electrons. Four imidazolium ionic liquids functionalized pillar [5] arenes have been tested as stationary phases with numerous analytes and isomers. In particular, one of these showed superior performances if compared to commercial columns, enabling challenging isomeric separations of halogenated benzenes, aromatic aldehydes, and aromatic anilines. Significance and novelty To our knowledge, this is the first report on the use of the ionic liquid P[ n ]A as a stationary phase in chromatography, either in GC or liquid chromatography (LC) separations. This work demonstrates the promising potential of ionic liquid P[ n ]A stationary phases for chromatographic separations.
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FUEL
·
2018
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IF 4.908
Juan Zhang,Shuang Sun,Yuhang Bian,Weikang Li,Ran Liu,Dishun Zhao
Four metal phthalocyanines (Pc-4, 8, 12, 16) functionalized ionic liquids were polymerized on the surface of silica gel as adsorbent materials. They were characterized by FT-IR, BET, SEM and TEM measurements. The characterization results proved that the adsorbents were prepared successfully. Their adsorptive desulfurization performances to dibenzothiophene in model oil at room temperature and atmospheric pressure were investigated in detail. The results showed that the adsorptive desulfurization effect of P-4 was best. The optimal amount of adsorbent was 10 g/100 mL model oil. The maximum amount of DBT adsorbed was 52.41 mg/g, superior to some previously reported adsorbents. The adsorption equilibrium and kinetics of this adsorbent were also examined. The adsorption behavior fitted well to Freundlich isotherm model, pseudo-second-order kinetics model and Weber and Morris kinetics model. Adsorption and regeneration by solvent processes were performed 10 times, and the adsorption capacity of the adsorbent did not decrease obviously. P-4 also had a good adsorption effect on different sulfur compounds, and the order of removal was DBT > BT > 2-MTH > TH.
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ChemSusChem
·
2024
·Vol. 17
·期 16
·e202301951
·
IF 7.5
Kaili Wang,Zhaowei Zhang,Shenyao Wang,Lili Jiang,Haoran Li,Congmin Wang
Graphical CO 2 absorption capacity, desirable absorption enthalpy and excellent reversibility were achieved through dual-tuning azole-based ionic liquids for CO 2 capture from ambient air A strategy of tuning azole-based ionic liquids for reversible CO 2 capture from ambient air was reported. Through tuning the basicity of anion as well as the type of cation, an ideal azole-based ionic liquid with both high CO 2 capacity and excellent stability was synthesized, which exhibited a highest single-component isotherm uptake of 2.17 mmol/g at the atmospheric CO 2 concentration of 0.4 mbar at 30 °C, even in the presence of water. The bound CO 2 can be released by relatively mild heating of the IL-CO 2 at 80 °C, which makes it promising for energy-efficient CO 2 desorption and sorbent regeneration, leading to excellent reversibility. To the best of our knowledge, these azole-based ionic liquids are superior to other adsorbent materials for direct air capture due to their dual-tunable properties and high CO 2 capture efficiency, offering a new prospect for efficient and reversible direct air capture technologies.
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AICHE JOURNAL
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2024
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IF 3.5
Xiaorui Zhu,Lingyu Zhu,Jianli Wang,Jiayuan Wang
The objective of this study is to develop ionic liquids (ILs) derived from organophosphorus acids, featuring thermomorphic phase behavior tailored for homogeneous liquid–liquid extraction applications, addressing the challenges posed by the high viscosity of ILs. The novelty of our work includes a logP-based guideline for designing thermomorphic water/organophosphorus IL solvent systems and a proof-of-concept study on homogeneous liquid–liquid extraction applications. Specifically, we reported a series of novel ILs exhibiting lower critical solution temperature behavior in aqueous solutions by exploring various combinations of tetraalkylammonium cations with organophosphorus acid-based anions. Practical applications utilizing this type of thermomorphic solvent system for extracting metal ions and acids were demonstrated. The benefits of homogeneous extraction, as well as the limitations stemming from the salting-out effect, were presented and discussed.
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ChemSusChem
·
2012
·Vol. 5
·期 11
·2255-2261
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IF 6.827
Dazhen Xiong,Huiyong Wang,Zhiyong Li,Jianji Wang
Graphical Recovery of Ionic Liquids: Solutions of ionic liquids (ILs) and amines are separated into aqueous two-phase systems in the presence of CO 2 , in which the upper phase is ammonium-salt-rich and the lower phase is IL-rich. Thus, the ILs in aqueous solutions can be efficiently recovered, and the amines can be regenerated by heating and bubbling Ar or N 2 through the salt-rich phase. The recovery efficiency of the ILs is as high as 99 %. Recovery is a very important factor for the industrial application of ionic liquids (ILs). In this work, a novel method is presented for the recovery of ILs by using carbon dioxide (CO 2 )-induced formation of aqueous two-phase systems (ATPSs). It was found that, in the presence of amines, introduction of CO 2 into aqueous IL solutions leads to the formation of ATPSs at 25 °C and atmospheric pressure, in which the upper phase is ammonium-salt-rich and the lower phase is IL-rich. Thus, the ILs in aqueous solutions can be significantly enriched, and the amines can be regenerated by heating and bubbling Ar or N 2 in the salt-rich phase. To better understand the recovery of ILs, the phase diagrams of the ATPSs were measured at 25 °C, and the effects of the molecular structure of the ILs and the amines and temperature of the systems on the recovery efficiency of the ILs were investigated. It was shown that the single-step recovery efficiency of the ILs could be as high as 99 % in the presence of primary or secondary amines. Therefore, this new method could potentially be sustainable, efficient, and attractive to industry.
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JOURNAL OF PHYSICAL CHEMISTRY B
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2012
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IF 3.696
Jingjing Jiao,Bin Dong,Huina Zhang,Yingyuan Zhao,Xiaoqing Wang,Rui Wang,Li Yu
Halogen-free, low-cost alkyl sulfate-based surface active ionic liquids (SAILs), 1-butyl-3-methylimidazolium dodecyl sulfate ([C4mim][C12SO4]), and N-butyl-N-methylpyrrolidinium dodecyl sulfate ([C4MP][C12SO4]) were easily synthesized through ion exchange reaction. The aggregation behaviors of [C4mim][C12SO4] and [C4MP][C12SO4] in aqueous solution were investigated by surface tension, electric conductivity, and static fluorescence quenching. Both [C4mim][C12SO4] and [C4MP][C12SO4] have rather lower cmc, γcmc values and higher pC20, πcmc values than those reported for the traditional ionic surfactant, sodium dodecyl sulfate (SDS), and imidazolium-based SAIL, 1-dodecyl-3-methylimidazolium bromide ([C12mim]Br), with the same hydrocarbon chain length. The thermodynamic parameters evaluated from electric conductivity measurements show that the micelle formation of [C4mim][C12SO4] and [C4MP][C12SO4] is entropy-driven in the temperature range investigated. Lower average aggregation number indicates that the micelles of two SAILs present much looser structure. It is found that both the nature and the ring type of counterions can affect the aggregation behavior in aqueous solution. 1H NMR results of [C4mim][C12SO4] were used to further verify the mechanism of micelle formation. Hydration ability and steric hindrance of the imidazolium or pyrrolidinium counterion as well as the cooperative hydrophobic interaction of longer alkyl chain of [C12SO4] anion and comparatively shorter alkyl chain of [C4mim] or [C4MP] cation are proposed to play critical roles in the aggregation of [C4mim][C12SO4] and [C4MP][C12SO4].
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ENERGY & FUELS
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2012
·
IF 2.721
Wenjun Fang,Dongbei Shao,Xiaoxing Lu,Yongsheng Guo,Li Xu
A total of 10 new N-alkyl piperazinium-based ionic liquids (ILs) have been prepared, and they are used as extractants for removing aromatics from three kinds of hydrocarbon fuels. A total of 3 ILs, N-methyl piperazinium lactate (MPL), N-ethyl piperazinium lactate (EPL), and N-ethyl piperazinium propionate (EPP), in the liquid state at room temperature are used directly for extraction, while the other 7 ILs in the solid state at room temperature are used with methanol as the co-solvent. Effects on the extraction efficiency of the temperature and the amounts of IL and co-solvent are investigated. The results indicate that the amounts of IL and co-solvent play very important roles in the extraction process and the efficiency is greatly influenced by the cation and anion structures in the N-alkyl piperazinium-based ILs. In comparison to 1,1,3,3-tetramethylguanidinium lactate (TMGL), the extraction capability order is EPP > EPL > MPL > TMGL. The ILs with aromatic anions are found to have better extraction capability than the others. Furthermore, recycling of ILs reflects that these ILs can be recovered simply by vacuum distillation without a significant decrease in the activity of dearomatization.
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JOURNAL OF MOLECULAR LIQUIDS
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2017
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IF 3.648
Li-rong Nie,Shun Yao,Bing Dong,Xin-lu Li,Hang Song
In this paper, five novel cholinium-based organic magnetic ionic liquids (MILs) were synthesized. The carbon chain links to the nitrogen atom from cationic nucleus. The MILs were comprehensively identified by FT-IR, HPLC, UV–Vis, 1 H NMR and ESI-MS. The MILs have interesting performance to form aqueous two-phase system and can respond to the external magnetic field after the formation of aqueous two-phase system, which can assists magnetically phase separation. The magnetic susceptibility of the MILs was measured at 298 K. Other physical properties such as conductivities, acidity and density were measured in range of 278.15 K to 323.15 K for further application investigation. Satisfactory results were obtained after the data of physical properties were correlated. Based on the measurements and correlations above, some discussions were carried out, including the ion association and ion diffusion , the influences of MILs carbon chain and temperature on the molar conductivity , the influences of the cation size on the molar volume , acidity variation of the MILs.
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IONICS
·
2024
·
IF 2.4
Yan Qiang,Zhu Wenxu,Ma Xiaoxue,Liu Na,Liu Yucheng,Xia Meichen
A series of ether-functionalized paramagnetic ionic liquids, 1-(2-methoxyethyl)-3-alkylimidazolium tetra thiocyanate cobalt [C n 2O1IM] 2 [Co(NCS) 4 ] ( n = 1, 2, 3), was synthesized and characterized. The density, surface tension, refractive index, and electrical conductivity of these ionic liquids were measured at 293.15 to 343.15 K at intervals of 5 K, and their thermal expansion coefficients α were calculated. The molecular volume was obtained by measuring the pore volume and porosity. Based on Glasser theory, the standard entropy S 0 (298 K), lattice energy U POT , surface entropy S a , and surface enthalpy, H of the ionic liquids were calculated, and the reason why the ionic liquid is in a molten state at room temperature was explained from the perspective of lattice energy. The molar surface Gibbs energy was introduced to improve the traditional Eötvös equation, which was combined with the refractive index to estimate the surface tension, obtaining a fitting index exceeding 0.99. Finally, the relationship between the electrical conductivity of the ionic liquids and temperature was investigated, and the activation energy, molar electrical conductivity, and electrical conductivity diffusion coefficient of the ionic liquids were obtained. The relationship between their properties was summarized. Compared with previously reported ionic liquids using 1-(2-methoxyethyl)-3-methylimidazolium as a cation, this type of ionic liquid has higher density and a smaller coefficient of thermal expansion.
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COMPOSITES COMMUNICATIONS
·
2025
·
IF 7.7
Yanyou Huang,Liangdong Ye,Qiaoyan Wei,Dacheng Li,Zengju Wu,Liling Zhang,Chuanheng Yu,Ziwei Li,Shaorong Lu
Improving the toughness of epoxy resins is critical for high-performance applications. In this study from molecular structure design, hyperbranched ionic liquids (HBIL) containing imidazole groups were synthesized through a one-step esterification method. These HBIL were subsequently combined with recycled polyethylene terephthalate (PET) to synergistically enhance the toughness of epoxy resins (EP). The mechanical, thermomechanical, and rheological properties, as well as the curing behavior of the epoxy composites, were systematically evaluated. The addition of HBIL reduced the viscosity and curing temperature of the epoxy composite. The impact strength of the epoxy composites with only 6 phr PET was increased from 6.48 kJ/m 2 to 18.19 kJ/m 2 . Furthermore, the addition of HBIL exhibited a synergistic effect with PET. The epoxy composites added with 6 phr PET and 4 phr HBIL showed an increase in impact strength, elastic modulus, and flexural modulus by 237 %, 28.5 %, and 12.4 %, respectively, and an increase in the glass transition temperature (T g ) by 5.8 °C compared with pure EP. Molecular dynamics (MD) simulations corroborated these experimental results, providing insight into the improved properties. This study introduces an innovative approach to developing epoxy composites with superior performance characteristics.
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Advanced Science
·
2024
·
IF 14.3
Peiwen Wu,Bangzhu Wang,Linlin Chen,Jie Zhu,Ning Yang,Linhua Zhu,Chang Deng,Mingqing Hua,Wenshuai Zhu,Chunming Xu
Porous Ionic Liquids (PILs) have gained attention but facing challenges in catalysis, especially in liquid-liquid two-phase reactions due to limited catalytic sites and hydrophilicity control. This work engineered a Type III PILs (PILS-M) using zeolitic imidazolate framework-8 (ZIF-8) confined phosphomolybdic acid (HPMo) as the microporous framework and N-butyl pyridine bis(trifluoromethane sulfonyl) imide ionic liquid ([Bpy][NTf 2 ]) as the solvent. The PILS-M not only combines the advantages of traditional ionic liquids and microporous frameworks, including excellent extraction, high dispersion of catalytically active species, remarkable stability, etc ., but also can make the inner surface of ZIF-8 turned to be hydrophilic that favors the contact between aqueous hydrogen peroxide oxidant and catalytically active sites for the promotion of catalytic performance in reactive extractive desulfurization (REDS) processes of fuel oils. This study demonstrates Type III PILs' potential as catalysts for sustainable chemical processes, offering insights into versatile PILs applications in diverse fields.
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