JOURNAL OF MOLECULAR LIQUIDS
·
2018
·
IF 4.513
Yunchang Fan,Xin Wang,Jing Li,Lina Zhang,Lei Yang,Pengfu Gao,Zhulin Zhou
The kinetics of the inhibitory effects of ionic liquids (ILs) on the trypsin activity was useful for the practical applications, herein, kinetic information of the IL-trypsin interaction was systematically studied by infrared (IR) and ultraviolet-visible (UV–Vis) spectroscopies. Experimental results indicate that the presence of ILs makes the Michaelis constant ( K m ) of the enzyme reaction increase, meanwhile, the maximum rate ( V max ) keeps constant, suggesting that the inhibition of ILs on the trypsin activity belongs to the reversible-competitive type. IR and UV–Vis spectra show that the presence of ILs does not change the secondary structures of trypsin. After removing the ILs, the trypsin activity can be recovered; the activation energy keeps constant without and with the presence of ILs.
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DOI
高影响因子
Journal of Biobased Materials and Bioenergy
·
2019
·Vol. 13
·期 1
·86-92
·
IF 0
Wang Ai-Li,Chen Li,Guo Peng,Ren Cong-Ying,Yi Ming
Vegetable oil microemulsified ionic liquids are promising renewable lubricant systems. In the present study, the interfacial composition and thermodynamic properties for castor oil, glycerol trioleate, and epoxidized soybean oil microemulsified ionic liquids were researched by dilution
method. The effects of the cationic chain length of ionic liquids, the oxyethylene groups' number of surfactants, the carbon chain lengths of co-surfactants and temperature on those above mentioned parameters were further detailed. The results showed that with the increase of temperature,
the cationic chain length of ionic liquids and the oxyethylene groups' number of surfactant, less co-surfactant at the interface was required to form the stable ionic liquid microemulsions. However, the requirement of co-surfactants at the interface was gradually increased with the increment
of the carbon chain lengths of co-surfactants. The standard Gibbs free energy changes for the transfer of co-surfactant from oil phase to the interface were negative in all investigated ionic liquid microemulsions, and the standard enthalpy and entropy changes for the transfer process depended
largely on the types of oil and the various thermal conditions.
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CATALYSIS TODAY
·
2024
·
IF 5.2
Heng Wang,Yubin Tian,Ming Xu,Xu Cheng,Jiawei Huang,Hongda Li,Yan Li,Yuying Shi,Lanxin Ye,Hongxia Liu,Qixun Shi,Chuan Wang
To achieve the sustainable production of acetylene hydrochlorination , the development of green and efficient mercury-free catalysts is a challenge. Ru-based catalysts are potential alternatives, but they are not applicable due to their high price and poor stability. Herein, we synthesized a series of low loading Ru-based catalysts modified by nitrogen-containing ionic liquids . These catalysts show high activity and stability based on the interaction between nitrogen-containing ionic liquids and Ru species. Among them, 1,3-bis(2,6-diisopropylphenyl)imidazolium chloride modified Ru-based catalyst, 0.3%Ru-N4/AC, exhibits excellent catalytic activity at 180 °C and a GHSV (C 2 H 2 ) of 170 h −1 , with an acetylene conversion of 94.3%. The addition of ionic liquids effectively promotes the dispersion of Ru species and increases the relative content of active Ru species on the activated carbon support. Simultaneously, the addition of ionic liquids also inhibits the reduction of active Ru species and prevents coke deposition, therefore improving the catalyst stability. 0.3%Ru-N4/AC catalyst also exhibits excellent stability over 150 h, demonstrating its potential as a mercury-free catalyst for acetylene hydrochlorination.
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高影响因子
RSC Advances
·
2016
·Vol. 6
·期 48
·42402-42412
·
IF 3.289
Suhang Xun,Dan Zheng,Sheng Yin,Yuejiao Qin,Ming Zhang,Wei Jiang,Wenshuai Zhu,Huaming Li
A series of TiO2 microspheres supported polyoxometalate-based ionic liquids (POM-ILs) with different tungsten–titanium molar ratios and different carbon chains ILs were successfully prepared. The supported catalysts were characterized by TG, FT-IR, Raman, Nitrogen adsorption–desorption isotherms, XPS and SEM. It is confirmed that the POM-ILs were indeed immobilized on TiO2 microspheres and the structures were maintained. The appropriate morphology and loading of the supported catalyst was obtained with [C16mim]4SiW12O40 (C16SiW) IL and the tungsten–titanium molar ratio was 0.1 (0.1-C16SiW–TiO2). This heterogeneous catalyst strategy makes the usage of ionic liquid decrease sharply. The supported catalyst 0.1-C16SiW–TiO2 exhibited high catalytic activity in the extractive coupled catalytic oxidative desulfurization (ECODS) system under mild conditions. The removal of dibenzothiophene (DBT) reached 95.3% with low-dosage oxidant (the molar ratio of H2O2 and DBT is only 2), which means high efficiency utilization of H2O2 was achieved in this system. Moreover, DBT could be removed completely with a little excess oxidant. Furthermore, the 0.1-C16SiW–TiO2 catalyst showed excellent reusing ability, the desulfurization efficiency had no obvious decrease after recycling for 8 times, which made it a promising catalyst in oxidative desulfurization process.
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高影响因子
ENERGY & FUELS
·
2013
·
IF 2.853
Qianli Wang,Lecheng Lei,Jingke Zhu,Bin Yang,Zhongjian Li
In this work, three 4-dimethylaminopyridinium-based ionic liquids (ILs), N-ethyl-4-dimethylaminopyridinium dicyanamide ([C24DMAPy][N(CN)2]), N-butyl-4-dimethylaminopyridinium dicyanamide ([C44DMAPy][N(CN)2]) and N-hexyl-4-dimethylaminopyridinium dicyanamide ([C64DMAPy][N(CN)2]), were synthesized and then demonstrated to be efficient for aromatic sulfur compounds extraction from fuels. The mutual solubility evaluating results indicated that 4-dimethylaminopyridinium-based ILs hardly dissolved in the fuels, while the solubility of 97# gasoline in ILs varies from 7.0 wt % for [C24DMAPy][N(CN)2] to 12.4 wt % for [C64DMAPy][N(CN)2] and the solubility of 0# diesel in ILs varies from 6.7 wt % for [C24DMAPy][N(CN)2] to 9.7 wt % for [C64DMAPy][N(CN)2]. Also, the sulfur partition coefficient was evaluated. In the case of model gasoline, the thiophene (TS) partition coefficient in model gasoline varies from 0.885 for [C24DMAPy][N(CN)2] to 1.218 for [C64DMAPy][N(CN)2]. In the case of model diesel, 4-dimethylaminopyridinium-based ILs exhibit a relatively higher sulfur partition coefficient, compared to alkyl modified pyridinium-based ILs. 1H NMR results confirmed that the high aromatic π-electron density of the dimethylaminopyridinium cation was the main reason for the good extraction performance. 1H NMR results also confirmed the KN sequence for each IL ([C24DMAPy][N(CN)2] < [C44DMAPy][N(CN)2] < [C64DMAPy][N(CN)2]) is mainly due to the sulfur compounds and ILs structures. Furthermore, the extractive selectivity results indicated a more preferable extraction of TS than toluene with 4-dimethylaminopyridinium-based ILs. To have a better evaluation of the overall sulfur extraction performance, the three 4-dimethylaminopyridinium-based ILs were compared to other typical ILs (e.g., pyridinium-based ILs and imidazolium-based ILs), which suggested our synthesized 4-dimethylaminopyridinium-based ILs exhibited good balance between mutual solubility and the sulfur partition coefficient. ILs after use were regenerated by a water dilution process. Based on these results, 4-dimethylaminopyridinium-based ILs can be used as potential extractants for EDS processes.
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高影响因子
ACS Omega
·
2020
·
IF 2.87
Jian Gao,Yafeng Zhu,Wenqi Liu,Suyu Jiang,Jie Zhang,Wei Ma
Regulating the states of hydrogen bonds in ionic liquids (ILs) is an effective way to improve their catalytic performance. In this paper, disulfonic-functionalized acidic ionic liquids (DSFAILs) were synthesized successfully, including novel SO3H-functionalized binuclear IL (bis[3-(CH2)3SO3H-1-(CH2)2-Im][HSO4]2). For the biodiesel synthesis, compared with the traditional ILs catalysts, DSFAILs bis[(3-(CH2)3SO3H-1-(CH2)2-Im][HSO4]2, [Im(N (CH2)3SO3H)2][HSO4]) had higher catalytic activity even under mild reaction conditions. Using the density functional theory (DFT) method, the role of hydrogen bonds in different SO3H-functionalized acidic ionic liquids (SFAILs) was explored. The forms of hydrogen bonds existing in different ILs directly determine their acidity. It suggested that the forming status of the active sites (hydrogen bonds) were diverse in different SFAILs. Also, deep ionization of the hydrogen atoms from the cation–anion strong interaction could increase the acidity and catalytic performance of SFAILs. From this, the structure–activity relationship between the SFAILs structures and the catalytic activity of methyl oleate synthesis was proposed. Besides, the experimental results also showed that bis[3-(CH2)3SO3H-1-(CH2)2-Im][HSO4]2 catalyst had a high catalytic activity to obtain methyl oleate and the catalyst could be separated easily owing to its larger molecular weight. However, [Im(N(CH2)3SO3H)2][HSO4] had a stronger acidity and a lower steric hindrance and thus a higher catalytic activity and was the optimal catalyst for the methyl oleate synthesis. In the presence of a small amount of catalyst (6 wt %) and at low reaction temperature (353 K), the methyl oleate yield could reach up to 93%. After six recycles of the catalyst, the methyl oleate yield remained at 90%.
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高影响因子
ACS Applied Materials & Interfaces
·
2020
·
IF 8.758
Li Wang,Jie Hu,Yunxiao Liu,Jie Shu,Hao Wu,Zhaozhao Wang,Xiaolong Pan,Ning Zhang,Lijuan Zhou,Jianming Zhang
The surface functionalization of cellulose nanocrystals (CNCs) is of significant importance for promoting its diverse applications. However, the efficient strategy reported so far for cation functionalization of CNCs remains limited owing to the electrostatic attraction between cationic modifiers and electronegative CNCs. Herein, a cationized CNC (CNC-LA-IL) has been successfully prepared in aqueous media by grafting the [VBIm][BF4], a kind of ionic liquid (IL), on the surface of a sulfated CNC using lactic acid (LA) as a linker molecule. This surface functionalization not only converts the negative charge of CNC suspensions to a positive charge (zeta potential reversed from −35 to +40 mV) but also leads to enhanced thermal stability and redispersibility of the dried CNC. To examine the reinforcing effect of IL-modified CNCs, poly(vinyl alcohol) (PVA)/CNC-LA-IL nanocomposite films were further prepared by the solution casting method. To one’s surprise, the as-prepared PVA/CNC-LA-IL films exhibit extraordinary improvement in both the tensile strength (92%) and the toughness (166%) with only a 0.3 wt % CNC loading. This study provides a green and facile method to achieve ionic liquids grafted CNCs for high-performance nanocomposites.
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高影响因子
RSC Advances
·
2019
·Vol. 9
·期 18
·10100-10108
·
IF 3.049
Shuanggen Wu,Fenfang Li,Liangbin Zeng,Chaoyun Wang,Yuanru Yang,Zhijian Tan
Amino acid-based ionic liquids (AAILs) are generally thought of as green solvents and widely used in many regions without systematic assessment of their effect on the environment or human health. In this work, a series of AAILs with different cations and amino acid anions were prepared and characterized, after which their microbial toxicity, phytotoxicity, and biodegradability were evaluated. The results showed that not all AAILs had low toxicity against microorganisms and that some AAILs were highly toxic towards the targeted microorganisms. The phytotoxic effect of the AAILs on rice (Oryza sativa L.) further demonstrated that AAILs should not be presumed to be non-toxic to plants. Moreover, the biodegradability tests showed that majority of AAILs were not satisfactorily biodegradable. In summary, not all AAILs are non-toxic or biodegradable, and their effect on the environment and human health must be assessed before their mass preparation and application.
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高影响因子
Nanoscale Research Letters
·
2016
·Vol. 11
·期 1
·1-7
·
IF 2.584
Xia Fangqing,Yong Huaisong,Han Xiao,Sun Dazhi
Exfoliation of layered inorganic nanomaterials into single-layered sheets has been widely interested in materials chemistry and composite fabrication. Here, we report the exfoliation of layered zirconium phosphate nanoplatelets by using small molecule intercalating agents in ionic liquids, which opens a new platform for fabricating single-layered inorganic materials from synthetic layered compounds.
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高影响因子
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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高影响因子
Molecular Catalysis
·
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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产品关联
DOI
高影响因子
JOURNAL OF SOLID STATE CHEMISTRY
·
2026
·
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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产品关联
DOI
高影响因子
危险品化学品经营许可证（带存储）