INDUSTRIAL & ENGINEERING CHEMISTRY RESEARCH
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2016
·
IF 2.567
Wei He,Fan Zhang,Zhi Wang,Wei Sun,Zhiyong Zhou,Zhongqi Ren
Carbon capture and sequestration (CCS) has become an increasingly important technology for environmental protection and resource utilization. In this work, four task-specific ionic liquids (TSILs), NH2-functionalized IL and three ether-functionalized ILs, were synthesized for CO2 absorption. CO2 absorption experiments of these task-specific ionic liquids (TSILs) showed that the absorption performance of NH2-functionalized IL was higher than that of ether-functionalized ILs. The recycling experiments of CO2 absorption demonstrated a good reusability of synthesized TSILs for CO2 absorption. Supported ionic liquid membranes (SILMs) with synthesized TSILs were prepared, and the CO2/CH4 and CO2/N2 separation performance of SILMs was examined. Results indicated that the SILMs with ether-functionalized ILs have slightly lower permeability but much higher selectivity (up to 9.7) than the SILMs with NH2-functionalized IL. Poly(RTIL)-RTIL composite membranes were prepared using ether-functionalized ILs. The effect of cross-linking monomer content and nonpolymerizable IL (“free” IL) content in poly(RTIL)-RTIL membranes on the CO2/CH4 and CO2/N2 separation performance was investigated. The composite membranes have higher gas permeability with little or no sacrifice in selectivity compared with SILMs. The stability evaluation and comparison of the SILMs and poly(RTIL)-RTIL membranes were conducted, the results of which verified the stronger structural stability of the poly(RTIL)-RTIL membranes. This suggests the potential of poly(RTIL)-RTIL membranes in future CO2-selective membrane separation.
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ELECTROCHIMICA ACTA
·
2016
·
IF 4.803
Heng Zhang,Xiaorong Cheng,Qiang Ma,Wenfang Feng,Liping Zheng,Jin Nie,Xuejie Huang,Michel Armand,Zhibin Zhou
A new family of hydrophobic ionic liquids (ILs) based on a super-delocalized perfluorinated sulfonimide anion, namely (trifluoromethyl( S -trifluoromethylsulfonylimino)sulfonyl)(trifluoromethylsulfonyl)imide ([CF 3 SO( NSO 2 CF 3 ) 2 ] − , [sTFSI] − ), with various oniums, including imidazolium, quaternary ammonium, pyrrolidinium and piperidinium, have been prepared and characterized. Their physical and electrochemical properties are extensively characterized, and comparatively studied with those based on a lesser delocalized analogue, bis(trifluoromethanesulfonyl) imide ([(CF 3 SO 2 ) 2 N] − , [TFSI] − ), in terms of thermal properties, density, viscosity, ionic conductivity, and electrochemical stability. These new [sTFSI]-based ILs show low glass transitions (between −95 and −81 °C), relatively low viscosities (36–120 cP at 25 °C), good thermal stabilities ( T d > 400 °C), and wide electrochemical windows. Particularly, the viscosities are generally lower for the [sTFSI]-based ILs than for the corresponding [TFSI]-based ones, due to better charge delocalization and higher degrees of freedoms for [sTFSI] − vs. [TFSI] − . It is found that the [sTFSI] − anion is more resistant toward oxidation, but less resistant toward reduction than the [TFSI] − one, suggesting that replacement of a O group in [TFSI] − with a strong electron-withdrawning CF 3 SO 2 N = group increase both the reductive and oxidative potential. The coulombic efficiencies of Li deposition/stripping on Ni electrode are comparable in the [sTFSI]- and [TFSI]-based ionic liquid electrolytes; however, Li/LiFePO 4 cell using the [sTFSI]-based ionic liquid electrolyte shows more stable cycling performance than that using the [TFSI]-based one, which would be attributable to the improved anodic stability of the [sTFSI] − anion and stable electrode/electrolyte interphases formed on Li anode.
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NEW JOURNAL OF CHEMISTRY
·
2017
·Vol. 41
·期 10
·3766-3772
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IF 3.269
Wei Wang,Xiaolun Peng,Huayu Xiong,Wei Wen,Ting Bao,Xiuhua Zhang,Shengfu Wang
In this study, two biological template molecules and two common short-chain imidazolium ionic liquids with amphipathy were selected to synthesize four different types of metal nanoclusters (MNCs), which were templated on a biological molecule/imidazolium ionic liquids (ILs) complex with properties enhancement. The fluorescence intensity and stability of the MNCs were improved in different degrees via this simple and fast protocol. The fluorescence intensity of AgNCs was significantly enhanced primarily due to aggregation-induced emission (AIE), and it was attributed to the shrinking size and donation of delocalized electrons for other MNCs. Different template molecule must match with appropriate ILs to form a steady complex that stabilizes the MNCs. The stability of the MNCs was improved, especially for AuNCs, because biological molecule/imidazolium ILs complex was found to be an effective barrier in protecting the MNCs from quenching interactions. Compared to conventional cationic surfactant (sodium dodecyl sulfate, SDS), these imidazolium ILs exhibited superior properties enhancement of the nanomaterials. MNCs with excellent properties could be applied in bioanalysis, especially in fluorescence imaging in vitro, because of their undisturbed and durable optical signal.
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SEPARATION AND PURIFICATION TECHNOLOGY
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2017
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IF 3.359
Ai He,Bing Dong,Xueting Feng,Shun Yao
In this research, two types of aqueous two-phase systems (ATPS) based on n -alkyl-tropinium and n -alkyl-quinolinium bromide ionic liquids (ILs) + salt + water have been developed and studied experimentally at different temperature. The binodal curves are fitted to nonlinear Merchuk relationship. For both investigated ILs, the longer the cation alkyl chain is, the greater its ability for ATPSs formation is; meanwhile the ability of the potential salts used for phase separation was compared and sorted, and high temperature was not beneficial to form these tropinium/quinolinium ILs–based ATPSs. On the basis of above results, the new method of extraction for ginsenosides from crude extracts of Panax Ginseng C. A. Mey using IL-ATPS was developed for the first time. Under appropriate conditions, a relatively high extraction efficiency (99.5%), partition coefficient (K = 651) and selective enrichment for total saponins could be obtained. Furthermore, the target ginsenosides can be recovered from the IL-rich phase and the enrichment is conducive to improve their antioxidant activity. Above research is expected to provide meaningful reference for the separation of similar bioactive compounds.
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AUSTRALIAN JOURNAL OF CHEMISTRY
·
2016
·Vol. 69
·期 11
·1254-1260
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IF 1.427
Jiequn Wu,Tianxiang Yin,Shaoxiong Shi,Weiguo Shen
The systematic investigation of the aggregation behaviours of newly synthesised surface-active ionic liquids 1-alkyl-3-methylimidazolium bis(2-ethylhexyl)sulfosuccinate ([Cnmim][AOT], n = 2, 3, 5, 6, 7) by various techniques is reported. The critical aggregation concentrations (CACs) and the standard Gibbs free energies of aggregation () were determined from measurements on conductivity, fluorescence, and surface tension, which suggested a stronger self-assembly ability in the bulk solution for [Cnmim][AOT] surfactants with longer alkyl chain cations. An interesting structure transition driven by the penetration of the imidazolium cation into the aggregate when n > 4 was found by analysis of the variations of the values of CAC, , the degree of counter ion binding (β), and the micropolarity (I1/I3) immediately after the CAC with changing alkyl chain length of the imidazolium cation, which was further confirmed by 1H NMR measurements.
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CARBOHYDRATE POLYMERS
·
2017
·
IF 4.811
Pengbo Lu,Fan Cheng,Yanghao Ou,Meiyan Lin,Lingfeng Su,Size Chen,Xilang Yao,Detao Liu
Presently flexibly transparent film or nanopaper from all cellulose was mostly fabricated by assembling cellulose nanofibers disintegrated from macroscopic wood fibers which mostly suffers from potential environmental toxicity or high cost. In this work, we firstly reported an all-cellulose transparent film fabricated by a novel microwave-assisted ionic liquids technology (MILT). The use of MILT for treating the original all-cellulose paper brings nearly 2.6 fold-increases in optical transmission, and 2.0 fold-increases in tensile property compared to those without microwave assistance. More importantly, by contrast with the partial dissolution of cellulose in typical DMAC/LiCl, ILs, NaOH/urea, the MILT is extremely time-saved with responding to the highest increase in mechanical property because the high efficient surface dissolution and welding bind individual sheets together under a micro environment.
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PubMed
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ANALYTICAL AND BIOANALYTICAL CHEMISTRY
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2016
·Vol. 408
·期 10
·2543-2555
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IF 3.125
Zhang Yanjie,Du Shuaijing,Feng Zijie,Du Yingxiang,Yan Zhi
In recent years, chiral ionic liquids (CILs) have attracted more and more attention in the field of enantioseparation. In this study, two novel spirocyclic chiral ionic liquids, 1-butyl-3-methylimidazolium(T-4)-bis[(2 S )-2-(hydroxy-κO)-3-methylbutanoato-κO]borate (BMIm + BLHvB − ) and 1-butyl-3-methylimidazolium (T-4)-bis[(α S )-α-(hydroxy-κO)-4-methylbenzeneacetato-κO]borate (BMIm + BSMB − ), were applied for the first time in capillary electrophoresis (CE) to establish synergistic systems for enantiomeric separation. Significantly improved separations of five tested analytes were observed in the CILs synergistic systems based on three β-cyclodextrin derivatives (CD), compared with conventional single CD separation systems. Several principal parameters such as CILs concentration, cyclodextrin concentration, buffer pH, and applied voltage were systematically investigated with BMIm + BLHvB − /hydroxypropyl-β-CD selected as a model system to optimize the enantioseparation. Molecular modeling was applied to further demonstrate the chiral recognition mechanism of the CILs/hydroxypropyl-β-CD synergistic system, which showed a good agreement with the experimental results.
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JOURNAL OF INDUSTRIAL AND ENGINEERING CHEMISTRY
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2016
·
IF 4.179
Jingjing Cheng,Lijuan Shi,Jianjun Lu
Amino ionic liquids modified superparamagnetic mesoporous core/shell nanocomposite (Fe 3 O 4 @ n SiO 2 @ m SiO 2 @DHIM-NH 2 ) was synthesized to remove orange II and amaranth from water. Due to the multiple active sites of the introduced ionic liquids, the adsorbent presents superior adsorption performance and instantaneous adsorption capacity. The maximum adsorption capacities are reached at pH 2 due to the protonation of amino groups, which are 153.06 and 84.40 mg g −1 for orange II and amaranth, respectively. The good stability, rapid adsorption kinetics, large adsorption capacity, and high separation efficiency make Fe 3 O 4 @ n SiO 2 @ m SiO 2 @DHIM-NH 2 an efficient adsorbent for removing anionic contaminant from water.
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INDUSTRIAL & ENGINEERING CHEMISTRY RESEARCH
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2016
·
IF 2.567
Huan Ren,Min-Hua Zong,Hong Wu,Ning Li
Nine cholinium ionic liquids (ILs) were synthesized. A high solubility of lignin (up to 483 mg g–1) and xylan (up to 721 mg g–1) was observed in four ILs containing organic anions, while cellulose, chitosan, and keratin were scarcely soluble in all ILs. These ILs were used for wheat straw pretreatment. Among the nine ILs tested, cholinium taurate ([Ch][Tau]) was the best. The effects of biomass particle sizes, water contents, and biomass loadings on the IL pretreatment were studied. Readily digestible residues were obtained after wheat straw up to 2 mm size was pretreated. Additionally, this IL pretreatment process was highly tolerant toward moisture. A good reducing sugar yield (79.7%) was achieved in the enzymatic hydrolysis of wheat straw pretreated by [Ch][Tau] at a biomass loading of 10% under 80 °C for 6 h. Therefore, renewable sulfonate-based cholinium ILs may be promising solvents for pretreatment and fractionation of lignocelluloses.
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LANGMUIR
·
2016
·
IF 3.993
Yunlei Shi,Dazhen Xiong,Huiyong Wang,Yang Zhao,Jianji Wang
The creation of CO2-responsive materials that undergo structural transition between micelle and vesicle is of great importance from both theoretical and practical points of view. In this work, we have developed a series of CO2-responsive single-tailed amphiphilic ionic liquids (ILs) composed of N-alkyl-N-methyldiethanolamine cation [CnMDEA]+ (n = 8, 10, 12, 14, 16, 18) and 2-pyrrolidinone [2-Pyr]− anion. The aggregation behavior and self-assembly structures of the ILs in aqueous solution have been investigated by conductivity, surface tension, dynamic light scattering, cryogenic transmission electron microscopy, small-angle X-ray scattering, and nuclear magnetic resonance spectroscopy. For the first time, CO2 driven reversible switching of self-assembly between spherical micelle and unilamellar vesicle is found for [CnMDEA][2-Pyr] (n = 16, 18) in aqueous solutions at 20 °C and atmospheric pressure. It is shown that the mechanism behind the reversible micelle to vesicle transition involves the formation of carbamate anion from the reaction between [2-Pyr]− and CO2.
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PubMed
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ACS Sustainable Chemistry & Engineering
·
2016
·
IF 5.267
Huiyong Wang,Shuyan Liu,Yuling Zhao,Hucheng Zhang,Jianji Wang
Ionic liquids (ILs) have shown superior performance in the conversion of biomass to 5-hydroxymethylfurfural (5-HMF) as reaction medium and/or catalyst, which is a green platform compound with a wide range of applications in manufacturing fine chemicals and biofuels. Nevertheless, the separation of 5-HMF from ILs is very difficult and becomes a technical bottleneck for IL application in the preparation of 5-HMF. To resolve this problem, understanding the interactions between ILs and 5-HMF is essential. In this work, attenuated total reflectance Fourier transform infrared, 1H nuclear magnetic resonance, and quantum chemistry calculations were combined to investigate the interaction between 5-HMF and each of the eight ILs over the whole composition range. The studied ILs have the same 1-butyl-3-methylimidazolium cation [C4mim]+ but different anions. It was found that interactions between the ILs and 5-HMF were mainly ascribed to the strong hydrogen bonds of 5-HMF with anions of the ILs, and the formation abilities of hydrogen bonds of the anions with O–H group of 5-HMF were found to decrease in the order [CH3COO]−, [C2H5COO]− > [HSO4]− > [CF3COO]− > [N(CN)2]− > [NO3]− > [CH3OSO3]− > [BF4]−. These results suggest that the anions with stronger hydrogen bond accepting ability have stronger interaction with 5-HMF and the separation of 5-HMF from the ILs is mainly governed by the hydrogen bonding interactions between anion of the ILs and 5-HMF. In addition, partition coefficients of 5-HMF between 1,4-dioxane and the ILs phases were determined experimentally to support the conclusion.
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SENSORS AND ACTUATORS B-CHEMICAL
·
2017
·
IF 5.401
Ying Liu,Jingyuan Liu,Qi Liu,Hongsen Zhang,Zhanshuang Li,Xiaoyan Jing,Yi Yuan,Hongquan Zhang,Peili Liu,Jun Wang
In recent years, room temperature ionic liquids (RTILs) have been highly utilized in electrochemical fields. Specifically, ionic liquids (ILs) as electrolytes augur promising potential for the next generation of advanced and miniaturized electrochemical gas sensors. In this paper, 1-ethyl-3-methylimidazolium hexafluorophosphate ([EMIM][PF 6 ]), 1-propyl-3-methylimidazolium hexafluorophosphate ([PMIM][PF 6 ]) and 1-butyl-3-methylimidazolium hexafluorophosphate ([BMIM][PF 6 ]) were synthesized through a facile one-pot method. We found that [EMIM][PF 6 ] and [PMIM][PF 6 ] exist in the solid state at room temperature. Hence, these ILs can effectively avoid the leakage of electrolytes. However, [BMIM][PF 6 ] can be present in liquid state at room temperature as the melting point decreases, due to the increasing of alkyl chain (C n , n < 6) for the ILs. Compared to solid electrolyte gas sensors, sensors based on liquid electrolytes offer a reliable response and achieve sufficient ion mobility to sense oxygen. Our work provides an incentive to enhance the properties of a liquid electrolyte by mixing it with Pt-modified ordered mesoporous carbons (Pt-OMCs), which not only prevents the aggregation of OMCs but also provides a large number of active sites for oxygen reduction. The limit of detection (LOD) in oxygen sensors based on Pt/CMK-3-COOH-[BMIM][PF 6 ] is relatively low (1.10% O 2 ). Our results indicate that the synergistic combination of ILs and Pt-OMCs markedly promotes the performance of electrochemical oxygen sensors.
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危险品化学品经营许可证（带存储）