JOURNAL OF POWER SOURCES
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2025
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IF 7.9
Pei Chen,Cuiying Lu,Xiaogang Che,Bin Yan,Juan Yang
The fabrication of carbon electrode materials with hierarchically porous structures and excellent ion/electron transport capability is crucial for supercapacitors with high energy density to date. Herein, the controllable preparation of hierarchical porous carbon architectures (denoted as PCCN) made of 1D carbon backbones and 2D carbon nanosheets is achieved by a chemical activation coupled with exfoliation-like effects of in-situ generated carbon dioxide (CO 2 ) gas from potassium bicarbonate (KHCO 3 ). It is found that the modulation of carbonization temperature and KHCO 3 dosage permits the formation of PCCN samples with tunable microstructures. The optimized PCCN 1:5-900 sample exhibits a large specific surface area of 1770 m 2 g −1 with a specific pore size distribution and interconnected porous frameworks, which can provide abundant ion-accessible electrode/electrolyte interfaces and fast ion/electron transport channels. Consequently, the assembled symmetrical PCCN 1:5-900 //PCCN 1:5-900 supercapacitor delivers a prominent specific capacitance of 144 F g −1 at 0.5 A g −1 , i.e. a high-energy density of 72.1 Wh kg −1 at an output power density of 477 W kg −1 , superior rate performance with capacitance retention of 63 % even at 100 A g −1 , and admirable cycling durability in the 1-ethyl-3-methylimidazolium tetrafluoroborate (EMIMBF 4 ) ionic liquid electrolyte. This work provides a feasible and sustainable method to make advanced carbon electrodes for ionic liquid and/or organic supercapacitor systems.
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JOURNAL OF CHEMICAL THERMODYNAMICS
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2012
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IF 2.422
Wu Qian,Yingjie Xu,Hongye Zhu,Chaohong Yu
Densities and viscosities of the pure ionic liquid 1-methylimidazolium acetate ([Mim]Ac) and its binary mixtures with methanol, ethanol, 1-propanol, and 1-butanol were measured at temperature ranging from T = (293.15 to 313.15) K. The thermal expansion coefficient, molecular volume, standard entropy, and lattice energy of [Mim]Ac were deduced from the experimental density results. A simple linear equation was used to correlate the variation of viscosity of [Mim]Ac with temperature. Excess molar volumes V E and viscosity deviations Δ η for the binary mixtures at above mentioned temperature were calculated and fitted to the Redlich–Kister equation with satisfactory results. Excess molar volumes for {[Mim]Ac + 1-butanol} mixture have an S shape, while those for other mixtures have a negative deviation from ideal behaviour over the entire mole fraction range. Viscosity deviations are all negative deviation for {[Mim]Ac + alcohol} mixtures. The results were interpreted in terms of interactions and structural factors of binary mixtures.
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JOURNAL OF MOLECULAR LIQUIDS
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2024
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IF 5.3
Sen Qin,Shanshan Dai,Wei Fan,Mei Li,Zou He,Jie Qi,Yang Yang,Huan Yan
To achieve excellent absorptive loading and low viscosity, a novel amino-functionalized ionic liquid [G1.0 PAMAM] [2-MI] combined with water for CO 2 capture is proposed in this work. The concentration of [G1.0 PAMAM] [2-MI], absorption temperature, and aeration rate were optimized by using Response Surface Methodology based on Box-Behnken design, and the model predictions were in good agreement with the experimental data. The results illustrated that the absorption loading of 42.71 wt% [G1.0 PAMAM] [2-MI]/H 2 O was 6.81 mol CO 2 /mol ILs (38.5°C, 100 mL/min), which was much higher than that of MEA /H 2 O, and the regeneration efficiency was maintained at 89.5 % after the eighth regeneration cycle. With the combined effect of 2-MI and water, the viscosities of the solution before and after absorption at 40°C were 35.3 and 53.8 mPa·s, respectively, which were significantly lower than those of the majority of ionic liquid absorbents. The reaction mechanism of [G1.0 PAMAM] [2-MI] with CO 2 was demonstrated by 13 C NMR to be a synergistic combination of a zwitterionic mechanism and a base-catalyzed hydration mechanism to produce carbamate and carbonate/bicarbonate (CO 3 2– /HCO 3 – ).
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JOURNAL OF CHROMATOGRAPHY B-ANALYTICAL TECHNOLOGIES IN THE BIOMEDICAL AND LIFE SCIENCES
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2017
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IF 2.603
Xiudan Hou,Xiaofeng Lu,Sheng Tang,Licheng Wang,Yong Guo
An environmental friendly sorbent of polymeric ionic liquids modified graphene oxide-grafted silica (PILs@GO@Sil) was synthesized for solid-phase extraction (SPE) of phenolic acids. The sorbent was prepared via a chemical layer-to-layer fabrication including amidation reaction, surface radical chain-transfer polymerization and in situ anion exchange. After modification with PILs, the silica surface had higher positive potential so that it would exhibit stronger electrostatic interaction for acidic compounds compared with GO@Sil. The adsorption performance of phenolic acids was investigated through the theoretical calculation and static, kinetic state adsorption experiments. Under the optimized conditions, wide linear ranges were obtained with correlation coefficients ranging from 0.9912 to 0.9998, and limits of detection were in the range of 0.20–0.50 μ g L −1 . Compared with other reported methods, the proposed PILs@GO@Sil-SPE-HPLC showed higher extraction efficiency. Finally, the black wolfberry yogurt and urine were analyzed as real samples and good recoveries spiked with standard solution were obtained.
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PubMed
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Frontiers in Chemistry
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2017
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IF 3.994
Li Xinjuan,Wang Kai,Ma Nana,Jia Xianbin
Naked-eye detection of amino acids (AA) in water is of great significance in the field of bioanalytical applications. Herein, polymerized ionic liquids (PILs) with controlled chain length structures were synthesized via reversible addition–fragmentation chain-transfer (RAFT) polymerization and post-quaternization approach. The AA recognition performance of PILs with different alkyl chain lengths and molecular weights was evaluated by naked-eye color change and ultraviolet-visible (UV–vis) spectral studies. These PILs were successfully used for highly sensitive and selective detection of Arg, Lys, and His in water. The recognition performance was improved effectively with increased molecular weight of PILs. The biosensitivity of the PILs in water was strongly dependent on their aggregation effect and polarization effect. Highly sensitive and selective detection of AA was successfully accomplished by introducing positively charged pyridinium moieties and controlled RAFT radical polymerization.
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SEPARATION AND PURIFICATION TECHNOLOGY
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2024
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IF 8.1
Liwei Sun,Lipeng Wang,Meilin Yin,Shaokun Tang
Direct utilization of low-concentration CO 2 is of importance to mitigate the global warming and reduce energy consumption. Herein, a new bi-functional ionic liquid-grafted material was fabricated for CO 2 /N 2 selectivity and diluted CO 2 cycloaddition reaction. Following the preparation of 1-carboxymethyl-3-methoxy ethyl-imidazolium chloride ([CmMOEim]Cl) containing carboxyl and ether group, MIL-53(Al) was used for directly chemical grafting of the ionic liquid to obtain [CmMOEim]Cl@MIL-53(Al). CO 2 capture capacity of [CmMOEim]Cl@MIL-53(Al) reached up to 70 cm 3 CO 2 /g sorbent at 25 °C and 0.1 MPa, which was higher than that of two individual components. Cyclopropyl carbonate of 97 % yield was obtained at 110 °C, 3 MPa of initial 50 vol% CO 2 /N 2 pressure and 4 h with 2.4 wt% [CmMOEim]Cl@MIL-53(Al)-0.4 under solventless and co-catalyst-free condition. Various terminal cyclocarbonates were synthesized with above 90 % yield. In addition, the heterogeneous catalyst was separated from reaction system by simple centrifugation and the yield of cyclopropyl carbonate was higher than 90 % after 12 cycles owing to the chemical grafting of [CmMOEim]Cl on MIL-53(Al).
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INDUSTRIAL & ENGINEERING CHEMISTRY RESEARCH
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2024
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IF 3.8
Rui Zhao,Yuan Zong,Guang Li,Ling Zhao,Gance Dai
As emerging green solvents, ionic liquids (ILs) have promising applications in many fields. However, its long reaction time and high price restrict its industrial application. The main reason for this is due to the generation of droplets during the synthesis reaction. Aiming at the process intensification of the 1-methylimidazole (MIM)-based ILs, this paper has studied the evolution behavior of the droplets during its synthesis according to droplet breakage theory. The results show that the droplet size distribution (DSD) and its number density are closely related to the reaction progress. By comparing the Kolmogoroff microscale and droplet size, the synthesis process can be divided into Reaction stage I, when the conversion of MIM is below 60%, and Reaction stage II, when the conversion of MIM is beyond 60%. High stirring speed and temperature increase have been put forward for each stage. The reaction time can be effectively reduced by 43.93%, which is instructive in improving the production efficiency of [BMIM]Br.
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ACS Applied Polymer Materials
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2024
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IF 4.4
Hao Yu,Shichao Li,Zhihan Wang,Cong Yu,Jiaming Zheng,Jiangna Guo,Yingjie Zhou,Wei Peng,Feng Yan
Waterborne polyurethane (WPU) coatings have gained numerous attentions and popularity due to their outstanding structural tunability and environmental friendliness, but their applications are often limited due to their susceptibility to harbor bacteria and poor water resistance. Herein, a group of water-resistant antibacterial WPU coatings were developed by simultaneously incorporating imidazolium cations and siloxane groups into the WPU backbone. Utilizing imidazolium cations, the resulting WPU films and coatings demonstrated exceptional antibacterial efficacy against Escherichia coli and Staphylococcus aureus, with rates exceeding 99.99%. The incorporated siloxane groups are prone to migrate to the surface of the coatings/films due to their low surface free energy, thus significantly promoting the antifouling properties and hydrophobicity of the resulting WPU films/coatings.
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International Journal of Refrigeration
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2025
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IF 3.8
Yutong Gong,Feng Liu,Jun Sui,Yanlong Lv,Yuhao Wang
To explore the application performance of ternary ionic liquid-based working pairs in absorption heat transformers, this study measured the saturated vapor pressure of H 2 O/LiBr+[EMIM][Ac], H 2 O/LiBr+[BMIM][I], and H 2 O/LiBr+[EPy][Br] solutions at temperature ranging from 25 to 200°C under different concentrations. The experimental data were correlated with an absorption heat exchanger model using the Non-Random Two-Liquid (NRTL) activity coefficient model and enthalpy calculation equations. Sensitivity analyses were conducted on condensation, evaporation/generation, and absorption temperature, with comparisons made to the conventional LiBr/H 2 O working pair. The results demonstrated that the traditional LiBr/H 2 O solution exhibited higher coefficients of performance (COP) and exergetic efficiency (ECOP) under varying condensation, evaporation, and absorption temperatures, but its applicable heat source temperature range was narrow, and it showed no advantage under high output temperature requirements. In contrast, the three ternary IL working pairs exhibited lower COP and ECOP values compared to LiBr/H 2 O, but H 2 O/LiBr+[BMIM][I] and H 2 O/LiBr+[EPy][Br] demonstrated broader applicable heat source and output temperature ranges. Among them, H 2 O/LiBr+[BMIM][I] exhibited the best performance, achieving superior system efficiency at heat source temperatures above 102°C, making it suitable for systems operating with unstable waste heat sources. Additionally, H 2 O/LiBr+[BMIM][I] achieved the highest optimal ECOP of 0.58 at an absorption temperature of 215°C, meeting high output temperature demands and offering significant temperature lift advantages. This study provides critical insights for the application of ternary ionic liquid working pairs in absorption heat transformers. Future research could incorporate system structure optimization and environmental-economic analysis to provide stronger scientific foundations for the application of ternary ionic liquid working pairs.
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SEPARATION AND PURIFICATION TECHNOLOGY
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2025
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IF 9
Mian Zhu,Chao Lyu,Feng Dai,Jingxian Liu
To develop an environmentally friendly CO 2 capture technology, composite adsorbent beads were synthesized through the in situ growth of ZIF-8 in a nanocellulose gel scaffold prepared from pine needles-derived cellulose. The composite beads were subsequently functionalized with three ionic liquids ([BMIM][PF 6 ], [BMIM][BF 4 ], and [EMIM][TF 2 N]), which induced partial dissolution of the nanocellulose. This process resulted in the formation of unique wrinkled microstructures, resembling rice grains in morphology but exhibiting higher compressive strength. Notably, the IL-loaded CNF/ILs@ZIF-8 composites exhibited significantly superior adsorption performance over unmodified CNF@ZIF-8 (CZ) beads. Under static conditions (3 bar, 273 K), all three functionalized CNF/ILs@ZIF-8 variants enhanced CO 2 uptake capacities by > 46 %, with the [BMIM][PF 6 ] modified beads retaining 85.36 % of initial adsorption capacity after six adsorption–desorption cycles. Furthermore, under competitive dynamic adsorption (1 bar, 273 K), the [BMIM][BF 4 ] modified beads achieved a 43.12 % enhancement in CO 2 /N 2 selectivity compared to CZ. This work provides a MOF granulation strategy with process safety and environmental sustainability, potentially extending MOF applications in gas adsorption technologies.
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SEPARATION AND PURIFICATION TECHNOLOGY
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2024
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IF 8.1
Qian Qu,Yan Hu,Jiahao Xiong,Yu Ding,Yuqi Tang,Lingrui Chen,Yajun Zhao,Yuanzhu Mi
Stabilized water-in-oil emulsions present significant challenges for oil production. However, current demulsifiers often face limitations such as high demulsification temperatures, low efficiencies, and complex synthesis processes, making the resolution of this challenge a demanding task. In this study, we successfully synthesized two ionic liquid demulsifiers, PEDA-Br and GEDA-Br, employing a straightforward two-step procedure. The objective was to enable effective treatment of water-in-oil emulsions at low temperatures with high efficiency. The structure of the demulsifiers was characterized utilizing Fourier-transform infrared spectroscopy (FT-IR) and nuclear magnetic resonance hydrogen spectra ( 1 H NMR). Bottle tests were then conducted to evaluate their demulsification efficiency (DE) in water-in-oil (W/O) emulsions. The results demonstrated that GEDA-Br achieved a DE of 98.92 % at a concentration of 500 mg/L and a temperature of 50 °C after 2 h. Additionally, both PEDA-Br and GEDA-Br exhibited DE values exceeding 95 % at a salinity level of 10,000 mg/L, and both proved effective across a broad pH range of 4 to 12. These findings highlight their robust resistance to high salinity and both acidic and alkaline conditions. The study also examined the demulsification mechanism in terms of interfacial tension (IFT), elastic modulus of the interfacial film, three-phase contact angle (TCA), and microscopic observations. The excellent interfacial activity, ability to reduce interfacial tension, and electrostatic neutralization capability are responsible for its outstanding demulsification performance.
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JOURNAL OF ENVIRONMENTAL MANAGEMENT
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2025
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IF 8.4
Xiao-Jun Dai,Yi-Ting Chen,Wen-Ge Zhang,Shu-Xuan Li,Wen-Rui Zhang,Xiang-Hua Qi,Chun-Hui Gong,Peng Wang,Man-Li He,Yi Yang
Radioactive iodine (I 2 ) is a potential risk to environmental safety and human health. The design of efficient and stable functional materials for I 2 capture remains a challenge. In this work, a simple in-situ impregnation method is used to load Ionic Liquid (IL)-[C 2 mim][Tf 2 N] into the pores of MOF-808, named IL@MOF. IL@MOF exhibit excellent I 2 removal performance (2.61 g/g), which is 1.75 and 21.75 times higher than that of MOF-808 and [C 2 mim][Tf 2 N], respectively. This is attributed to the excellent pore structure of MOF-808 and the abundant heteroatom adsorption sites of IL. After modification with hydrophobic IL, IL@MOF exhibit good adsorption performance in high humidity environment. I 2 is retained within IL@MOF in the forms of I 3 − (85 %) and I 2 (15 %). The formation of I 3 − is attributed to charge transfer between the unsaturated site, the heteroatom (N, O, S, F) adsorption site and I 2 within IL@MOF. In addition, the adsorption sites on the IL@MOF surface and adsorption energy are investigated by Density Functional Theory (DFT). Finally, this study provides ideas and guidance for designing MOF-based composites for the effective immobilization of radioiodine.
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