Canadian Journal of Chemistry
·
2021
·Vol. 99
·期 10
·
IF 1.118
Shan Lining,Wang Haiyue,Guo Liying,Zheng Rongrong,Shi Lili,Zhang Shuo
In this work, we report a more simple and efficient way to synthesize a composite ionic liquid (IL) ([BMIM][Zn2Br5]) by directly coupling the IL with molecular sieves. Two kinds of immobilized catalysts were successfully synthesized: SBA-15-[BMIM][Zn2Br5] and SBA-15-CPTES-[BMIM][Zn2Br5]. The catalysts were used to catalyze the cycloaddition reaction of continuous transformation of CO2 and propylene oxide, and the catalytic performance of catalysts was further studied. Compared with the traditional IL catalysts, the catalysts not only have excellent catalytic performance, but also have a significantly longer service life. This is because the catalysts are formed by a high energy chemical bond of silane between IL catalysts and molecular sieves, which can effectively solve the problem of the loss of IL active components in the catalytic process.
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高影响因子
SOLID STATE IONICS
·
2014
·
IF 2.112
Heng Zhang,Wenfang Feng,Zhibin Zhou,Jin Nie
A new polymeric ionic liquid (PIL), poly(1-vinyl-3-methylimidazolium) bis(fluorosulfonyl)imide (PVyMIM-FSI), has been prepared by polymerization of the monomer of ionic liquids, 1-vinyl-3-methylimidazolium bis(fluorosulfonyl)imide (VyMIM-FSI). Its structure and composition have been characterized by 1 H and 19 F NMR, and viscosity-average molecular weight ( M v ). For comparison, the corresponding PIL, poly(1-vinyl-3-methylimidazolium) bis(trifluoromethanesulfonyl)imide (PVyMIM-TFSI), is also prepared and characterized. The physicochemical properties of the binary composite electrolytes of lithium bis(fluorosulfonyl)imide (LiFSI)/PVyMIM-FSI with various concentrations of LiFSI have been comparatively studied with those of the corresponding lithium bis(trifluoromethylsulfonyl)imide (LiTFSI)/PVyMIM-TFSI system, in terms of DSC , TGA , ionic conductivity , and lithium ion transference number ( t Li + ). Both the FSI − - and TFSI − -based PILs are thermally stable up to 250 °C. While both types of the prepared PILs show a significant decrease in glass transition temperature ( T g ) upon addition of lithium salt, the values of T g for the composite electrolytes of LiFSI/PVyMIM-FSI are all significantly lower by 20–60 °C in magnitude than those of the corresponding LiTFSI/PVyMIM-TFSI composite ones, indicating much better plasticizing effect for FSI − vs. TFSI − . The ionic conductivities of LiFSI/PVyMIM-FSI are all higher by about 2 orders in magnitude than those of the corresponding LiTFSI/PVyMIM-TFSI with the same concentration of lithium ions.
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RSC Advances
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2015
·Vol. 5
·期 121
·99927-99934
·
IF 3.84
Chao Wang,Wenshuai Zhu,Zhigang Chen,Sheng Yin,Peiwen Wu,Suhang Xun,Wei Jiang,Ming Zhang,Huaming Li
An aerobic oxidative deep-desulfurization process for aromatic sulfides, such as dibenzothiophene (DBT), benzothiophene (BT), 4,6-dimethyldibenzothiophene (4,6-DMDBT), was carried out via ionic liquids (ILs) extractive coupled with photochemical oxidation. In this process, sulfur compounds in n-octane were firstly extracted into the IL phase and then oxidized to corresponding sulfones. The sulfur removal efficiency of DBT with air as the oxidizing agent could reach up to 99.1% under mild conditions. Then, a possible reaction mechanism of this metal-free photochemical oxidative desulfurization system was proposed. The sulfur removal efficiency decreased slightly, even though the original S-concentration of DBT increased from 500 to 1000 ppm. The oxidation reactivity of different sulfur compounds decreased in the order of: DBT > 4,6-DMDBT > BT. The influences of alkene and aromatic addition were also investigated. Gas Chromatograph-Mass Spectrometer (GC-MS) measurements demonstrated that the sulfur compounds were converted to their corresponding sulfones and separated out of the oil phase. Under optimal conditions, the IL could be recycled at least 5 times without a remarkable decrease in activity.
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Journal of Chemistry
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2018
·
IF 1.726
Yinke Zhang,Hang Xu,Mengfan Jia,Zhuang Liu,Deqiang Qu
Response surface methodology (RSM) was selected to optimize a desulfurization process with metal based ionic liquids ([Bmim]Cl/CoCl2) and potassium monopersulfate (PMS) together to remove benzothiophene (BT) from octane (simulating oil). The four experimental conditions of PMS dosage, [Bmim]Cl/CoCl2 dosage, temperature, and reaction time were investigated. The results showed that the quadratic relationship was built up between BT removal and four experimental variables with 0.9898 fitting coefficient. The optimal conditions were 1.6 g (20 wt%) PMS solution, 3.2 g [Bmim]Cl/CoCl2, 46°C, and 23 min, which were obtained based on RSM and experimental results. Under the optimal condition, predicted sulfur removal rate and experimental sulfur removal rate were 96.7% and 95.4%, respectively. The sequence of four experimental conditions on desulfurization followed the order temperature > time > [Bmim]Cl/CoCl2 dosage > PMS solution dosage.
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Analytical Methods
·
2013
·Vol. 5
·期 13
·3395-3402
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IF 1.855
Songyun Huang,Yuzhi Wang,Yigang Zhou,Li Li,Qun Zeng,Xueqin Ding
In this paper, an ionic liquid-based aqueous two-phase system (ATPs) has been developed for the effective extraction of bovine serum albumin (BSA). Compared with the effects of three different ionic liquids used in an aqueous two-phase system, a choline-like ionic liquid was selected as the suitable solution for bovine serum albumin. Extraction efficiencies of BSA were found to be dependant on the temperature, time, IL mass and the salt content. Based on single-factor experiments, these significant operating parameters of the ILs-ATP were respectively optimized. Experimental results show that 92.03–100.03% of the proteins could be extracted into the ionic liquid-rich phase in a single-step extraction. Repeatability, precision and stability experiments were investigated and the RSDs are lower than 2.3%, 1.7% and 4.7% respectively. Experiments indicated that intermolecular forces, the micelle phenomenon and the salting-out effect play important roles in the transfer process, and the aggregation phenomenon was the main driving force for the separation. Conformation of the protein was not affected after extraction into the upper ionic liquid-rich phase according to the determination by UV-visible (UV-vis), fluorescence spectra, dynamic light scattering (DLS), Fourier transform infrared (FT-IR) spectroscopy and TEM. It is suggested that the method of choline-like ILs-based ATPs for the selective separation of protein would have potential applications in bio-analysis and bio-separation.
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JOURNAL OF DISPERSION SCIENCE AND TECHNOLOGY
·
2018
·
IF 1.454
Shengfu Duan,Yajie Jiang,Tao Geng,Hongbin Ju,Yakui Wang
Novel methyltriphenylphosphonium carboxylate ionic liquid (IL) surfactants [Ph3PCH3][CH3(CH2)6COO] (MTPP-O), [Ph3PCH3][CH3(CH2)8COO] (MTPP-D), [Ph3PCH3][CH3(CH2)10COO] (MTPP-L), [Ph3PCH3][CH3(CH2)12COO] (MTPP-M), [Ph3PCH3][CH3(CH2)14COO] (MTPP-P), [Ph3PCH3][CH3(CH2)16COO] (MTPP-S) were synthesized via quaternization triphenylphosphine with dimethyl carbonate and anion exchange with different carboxylic acids successively. The structures of these IL surfactants were confirmed by FT-IR and 1H-NMR. Meanwhile, the wetting, foaming, and emulsification properties of these IL surfactants were studied in this paper. The results revealed that methyltriphenylphosphonium carboxylate IL surfactants have lower foaming properties than quaternary ammonium salts with the same anionic units. And, these IL surfactants show better emulsification ability to soybean oil than that of liquid paraffin. Furthermore, contact angle results indicated that these IL surfactants have different wettability for parafilm and the contact angle increases at a higher concentration for MTPP-L, MTPP-M, and MTPP-P.
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高影响因子
TALANTA
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2010
·
IF 3.29
Huan Zeng,Yuzhi Wang,Jinhuan Kong,Chan Nie,Ya Yuan
An ionic liquid-based microwave-assisted extraction (ILMAE) method has been developed for the effective extraction of rutin from Chinese medicinal plants including Saururus chinensis (Lour.) Bail. (S. chinensis) and Flos Sophorae. A series of 1-butyl-3-methylimidazolium ionic liquids with different anions were investigated. The results indicated that the characteristics of anions have remarkable effects on the extraction efficiency of rutin and among the investigated ionic liquids, 1-butyl-3-methylimidazolium bromide ([bmim]Br) aqueous solution was the best. In addition, the ILMAE procedures for the two kinds of medicinal herbs were also optimized by means of a series of single factor experiments and an L 9 (3 4 ) orthogonal design. Compared with the optimal ionic liquid-based heating extraction (ILHE), marinated extraction (ILME), ultrasonic-assisted extraction (ILUAE), the optimized approach of ILMAE gained higher extraction efficiency which is 4.879 mg/g in S. chinensis with RSD 1.33% and 171.82 mg/g in Flos Sophorae with RSD 1.47% within the shortest extraction time. Reversed phase high performance liquid chromatography (RP-HPLC) with ultraviolet detection was employed for the analysis of rutin in Chinese medicinal plants. Under the optimum conditions, the average recoveries of rutin from S. chinensis and Flos Sophorae were 101.23% and 99.62% with RSD lower than 3%, respectively. The developed approach is linear at concentrations from 42 to 252 mg L −1 of rutin solution, with the regression coefficient ( r ) at 0.99917. Moreover, the extraction mechanism of ILMAE and the microstructures and chemical structures of the two researched samples before and after extraction were also investigated. With the help of LC–MS, it was future demonstrated that the two researched herbs do contain active ingredient of rutin and ionic liquids would not influence the structure of rutin.
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高影响因子
POLYMERS FOR ADVANCED TECHNOLOGIES
·
2020
·Vol. 32
·期 4
·1579-1596
·
IF 2.578
Yongliang Guo,Xiaodong Chen,Jinfeng Cui,Junhong Guo,Haojun Zhang,Baoping Yang
Flame retardants (FRs) improve the intrinsic flammability of epoxy resins (EPs). However, the fundamental properties of EPs are inevitably compromised with the improvement of flame retardancy due to addition of FRs. Here, an ionic liquid (IL) octyltriphenylphosphonium-chelated orthoborate ([OTP][BScB]) has been synthesized and used as a flame-retarding additive for EP (hereafter (EP/[OTP][BScB])). Themogravimetry analysis (TGA) result indicated that the addition of [OTP][BScB] improved the residue yield during thermal degradation. Flammability and combustion tests showed the superior flame-retarding efficiency of the IL. More specifically, the addition of 3 wt% IL made EP/[OTP][BScB] pass the V-0 grade in the vertical burning test (UL-94) and achieve 32.5% value in the limited oxygen index (LOI) test. Cone calorimeter (CC) test showed that, compared with neat EP, EP/10[OTP][BScB] showed a reduction in the peak heat release rate (PHRR) and total heat release (THR) of by 39.7% and 21.8%, respectively, during combustion. Accordingly, the flame-retarding mechanisms in the gas and condensed phases were investigated in detail. In addition, tensile tests showed that the incorporation of the IL enhanced the mechanical property of EP/[OTP][BScB] to some extent. Moreover, UV–vis spectroscopy showed that the transparency of EP was basically maintained on the addition of [OTP][BScB]. Therefore, the IL [OTP][BScB] is a promising flame retardant to improve the properties of EP comprehensively.
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高影响因子
Royal Society Open Science
·
2019
·Vol. 6
·期 7
·
IF 2.515
Yifang Li,Dandan Yan,Yanhui Wu
Because of the preferential butanol selectivity of some ionic liquids (ILs), an increasing amount of research has appeared regarding their application in butanol separation. In this research, two ionic liquids, namely, 1-ethyl-3-vinylimidazolium bis[(trifluoromethyl)sulfonyl]imide ([EVIM][Tf2N], IL1) and N-octyl-pyridinium bis[(trifluoromethyl)sulfonyl]imide ([OMPY][Tf2N], IL2), were applied to modify a mesoporous molecular sieve MCM-41. The IL-modified MCM-41 samples were characterized by XPS, BET, XRD, SEM and TEM. The ionic liquid-modified MCM-41 was incorporated into the polymer PEBA to prepare mixed matrix membranes to study the influences of the filling of IL-modified MCM-41 and operating conditions on the performance of the mixed matrix membrane for butanol pervaporation. The results indicated that the pervaporation performance of the PEBA membrane was enhanced by the incorporation of IL-modified MCM-41. When the temperature of the feeding liquid was 35°C and the mass fraction of butanol was 2.5 wt%, the 5% MCM-41-IL2-PEBA membrane showed a permeation flux of 421.7 g m−2 h−1 and a separation factor of 25.4. The permeation flux and the separation factor of the membrane increased as the temperature of the feeding liquid increased. The results of the long-period experiment suggested that the 5% MCM-41-IL2-PEBA membrane exhibited high stability within 100 h of operation.
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高影响因子
JOURNAL OF COLLOID AND INTERFACE SCIENCE
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2018
·
IF 5.091
Yingjie Ma,Zhike Li,Huaiyuan Wang,Haiyan Li
Polyurethane (PU) microcapsules containing [BMIm]PF 6 as a lubricant have been fabricated by interfacial polymerization. The stabilizing effect of 10 kinds of emulsifiers towards [BMIm]PF 6 ionic liquid have been delineated. A Pickering emulsion stabilized by lignin showed the best emulsification effect on highly viscous [BMIm]PF 6 . The types and reactivities of monomers have an important influence on the formation of microcapsules. Three kinds of isocyanate (IPDI, MDI, TDI) were reacted with diamines or diols to prepare the PU microcapsules in this work. The optiaml [BMIm]PF 6 @PU microcapsules were obtained when using IPDI and TETA as monomers , under conditions of 5,000 rpm emulsifying rate, 0.5 wt% concentration of lignin Pickering emulsion , and a 3:1 mass ratio of [BMIm]PF 6 /IPDI. The synthesized microcapsules have a regular and compact spherical structure, smooth outer, and inner surfaces with a mean diameter of 43 ± 15 µm, and a thickness of 3.8 µm. The core content of [BMIm]PF 6 @PU microcapsules was determined as >70%, and the initial decomposition temperature was 300 °C. The [BMIm]PF 6 ionic liquid shown excellent lubricating property, ultralow friction coefficient (decreased by 72.7%) and wear rate (decreased by 160 times) were obtained by embedding 30 wt% microcapsules into epoxy compared with pure epoxy.
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高影响因子
Analytical Methods
·
2016
·Vol. 8
·期 35
·6566-6572
·
IF 1.915
Xiaozhong Wang,Xuwen Li,Lanjie Li,Min Li,Qian Wu,Ying Liu,Jie Yang,Yongri Jin
A green and effective extraction system based on the use of an ultrasound-assisted ionic liquid aqueous two-phase system (IL-ATPS) was developed for the determination of aconitum alkaloids in lateral roots of Aconitum carmichaeli Debx (Fuzi in Chinese). IL-ATPS parameters, including the type and amount of ionic liquid, amount of salts, and pH value, as well as extraction time, were investigated. Under the optimized conditions, the recoveries of the analytes varied from 80.37 to 107.18%. The detection limits and quantification limits for the analytes were achieved within the ranges of 0.048–0.082 μg g−1 and 0.16–0.30 μg g−1, respectively. After extraction, the recovery of ionic liquids without the use of organic solvents was also confirmed. The hydrophilic ionic liquids (1-hexyl-3-methylimidazolium bromide) were converted into hydrophobic ionic liquids (1-hexyl-3-methylimidazolium hexafluorophosphate) by a metathesis reaction, and in situ liquid–liquid microextraction was triggered simultaneously. Finally, 0.1 mol L−1 HCl aqueous solution (containing 5% Tween-20) was used as the back-extraction agent to recover the ionic liquids.
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高影响因子
CHEMICAL ENGINEERING JOURNAL
·
2020
·
IF 10.652
Hao Wang,Gengming Jiang,Qing Han,Yi Cheng
Droplet-based microfluidics offers an effective approach for overcoming the drawbacks of high viscosity and costs of ionic liquids (ILs) in practical applications. However, studies on the hydrodynamic behavior of the formation of IL-based Janus microdroplets which can facilitate the multifunctional applications of ILs through unique structures, are still limited due to their complex interfacial properties and high viscosities. Here, magnetic ionic liquid (MIL)-water Janus droplets were generated in an assembled co-flowing 3D-printed microchannel. Seven typical flow patterns of MIL-water Janus droplet generation were presented in a mountain-shaped flow pattern diagram, which was compared to the flow regime demarcations of MIL single-phase droplet formation. The scaling law of MIL-water Janus droplet size was analyzed to further reveal the breakup mechanism of biphasic dispersed phases with large differences in viscosities and interfacial tensions. Besides, the morphology control of surfactant-free MIL-water Janus droplet in the microchannel was investigated qualitatively and quantitatively. And, by changing the continuous phase, the morphology evolution of MIL-water Janus droplet to core-shell structure was also observed. The present study would be useful for providing a deep and comprehensive understanding on the formation and structure control of IL-based Janus microdroplets which are promising candidates for the use in applications of catalysis and extraction.
研究领域:
化学工程
·
微流控技术
·
材料科学
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危险品化学品经营许可证（带存储）