SENSORS AND ACTUATORS B-CHEMICAL
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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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高影响因子
JOURNAL OF INDUSTRIAL AND ENGINEERING CHEMISTRY
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2016
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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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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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PubMed
高影响因子
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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SEPARATION AND PURIFICATION TECHNOLOGY
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2017
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IF 3.359
Yinge Bai,Ruiyi Yan,Feng Huo,Jianguo Qian,Xiangping Zhang,Suojiang Zhang
The recovery of carboxylic acids from dilute aqueous solution is necessary but difficult in chemical industry. Methacrylic acid (MAA) is an important chemical widely used in polymer industry. In this work, the recovery of carboxylic acid from diluted aqueous solution by liquid-liquid extraction using ionic liquids (ILs) as extractants was studied. MAA was employed as model carboxylic acid. The partition coefficients of MAA in biphasic system and the extraction efficiencies of MAA were determined for imidazolium-based ILs and quaternary ammonium salt ILs with different structure of cation and anion. The extraction conditions such as extraction time, extraction temperature, mass ratio of ILs to MAA aqueous solution, initial concentrations of MAA, and water content were evaluated. An internal mechanism of the MAA extract by ILs was revealed by combining solvatochromic study, FT-IR and quantum chemical calculations. The results show that the strong hydrogen bond basicity (β) of ILs results in the high partition coefficient of MAA, which provides guidance to molecular design of ILs for the high efficient extractive separation of MAA from diluted aqueous solution. Based on this, IL with strong hydrogen bond basicity ([N 8881 ]Cl) was used to extract MAA from dilute aqueous solution. Compared with hexane which is conventional solvent used in MAA extractive separation, [N 8881 ]Cl can get 49 times higher of partition coefficient value and the extraction efficiency reach 94.57% for the single-stage extraction.
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NEW JOURNAL OF CHEMISTRY
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2017
·Vol. 41
·期 12
·5091-5097
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IF 3.269
Zhi Wang,Zuopeng Li,Yunhe Jin,Wei Liu,Linhai Jiang,Qinghua Zhang
A series of hydrophobic room temperature ionic liquids (RTILs) composed of organic superbase-derived cations and the TFSI anion (bis(trifluromethylsulfonyl)imide) were designed and synthesized. The structures of these new RTILs were determined using 1H-NMR, 13C-NMR, IR, and elemental analysis. Their physicochemical properties, including thermal properties, density, viscosity, and electrochemical properties, were investigated. Thermogravimetric analysis (TGA) revealed that these superbase-derived RTILs have high decomposition temperatures of up to 450 °C. Studies on their electrochemical properties demonstrated that these RTILs have relatively wide electrochemical windows of up to 4.6 V and good ionic conductivities at room temperature. Their application potential as novel electrolytes in supercapacitors was also evaluated.
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高影响因子
INDUSTRIAL & ENGINEERING CHEMISTRY RESEARCH
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2016
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IF 2.567
Junhai Zhao,Shuhang Ren,Yucui Hou,Kai Zhang,Weize Wu
Task-specific ionic liquids (TSILs) have been widely observed to effectively absorb low-concentration SO2 from flue gas by chemical interaction. However, the interaction between SO2 and TSILs is still unclear. The addition of solvents can decrease the viscosity of TSILs and promote mass transfer, but whether the solvents have an impact on absorption is unknown, as is the effect on absorption mechanism. To solve these issues, we synthesized several types of TSILs containing carboxylate anion to capture SO2 from simulated flue gas. The mechanism of absorption of SO2 by the TSILs was investigated in detail using Fourier transform infrared (FT-IR), 1H nuclear magnetic resonance (NMR), and 13C NMR. The results show that chemical interactions can be found between the carboxylate anions of TSILs and SO2. Simultaneously, the effect of several solvents on SO2 absorption capacity of TSILs was studied. The results indicate that ethylene glycol (EG) in TSILs has a strong influence on SO2 absorption by guanidinium- and alkanolaminium-based TSILs, but for quaternary ammonium-based TSILs, EG has no effect. Finally, the interaction between EG and TSILs was investigated by FT-IR, and the absorption mechanism was studied. It has been found that the addition of EG can improve the basicity of guanidinium- and alkanolaminium-based TSILs to increase the absorption capacity.
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高影响因子
INDUSTRIAL & ENGINEERING CHEMISTRY RESEARCH
·
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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高影响因子
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
高影响因子
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
高影响因子
AUSTRALIAN JOURNAL OF CHEMISTRY
·
2016
·Vol. 69
·期 11
·1254-1260
·
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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高影响因子
RSC Advances
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2017
·Vol. 7
·期 71
·44688-44695
·
IF 3.108
Zhiyong Li,Huiyong Wang,Mengen Chu,Pengxin Guan,Yang Zhao,Yuling Zhao,Jianji Wang
Light modulation of the isomerization and aggregation behavior of ionic liquids in aqueous solution is of great importance from a fundamental and technical point of view. In this work, 4 kinds of azobenzene-based photoresponsive ionic liquids 2-hydroxyethyl-dimethyl-[10-(4-phenylazo-phenoxy)-decyl]-ammonium bromide (ChoC10Azo), 2-hydroxyethyl-dimethyl-[6-(4-phenylazo-phenoxy)-hexyl]-ammonium bromide (ChoC6Azo), 2-hydroxyethyl-dimethyl-[4-(4-phenylazo-phenoxy)-butyl]-ammonium bromide (ChoC4Azo) and 2-hydroxyethyl-dimethyl-[2-(4-phenylazo-phenoxy)-ethyl]-ammonium bromide (ChoC2Azo) were designed, synthesized and characterized. The photo-isomerization and light modulation of the aggregation behavior of these ionic liquids were investigated in water using UV-vis spectroscopy, conductivity, dynamic light scattering and small-angle X-ray scattering measurements. The results showed that these ionic liquids had rapid photo-responsive performance, and their photoisomerization efficiencies were greater than 83% after 5 s of UV irradiation. The equilibrium time of the isomerization reaction was about 30 s for ChoC6Azo, ChoC4Azo and ChoC2Azo, and about 10 min for ChoC10Azo. However, there was no significant difference between the equilibrium isomerization efficiencies of these materials. In addition, only ChoC10Azo could form micelles in water among the studied ionic liquids, UV/visible light irradiation only changed the size of its aggregates, but could not change its structure. The results have been used to understand the effect of azobenzene group position and alkyl chain length in the ionic liquids on the photoisomerization and self-assembly of the azobenzene-based ionic liquids in aqueous solutions.
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危险品化学品经营许可证（带存储）