JOURNAL OF APPLIED POLYMER SCIENCE
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2018
·Vol. 135
·期 41
·46740
·
IF 1.901
Jie-Ping Fan,Feng-Yan Zhang,Xue-Meng Yang,Xue-Hong Zhang,Ya-Hui Cao,Hai-Long Peng
A novel supermacroporous molecularly imprinted cryogel membrane (MICM) was prepared via cryopolymerization using a functionalized ionic liquid {(1-vinyl-3–(2-amino-2-oxoethyl) imidazolium chloride, [VAMIM]Cl]} as functional monomer. Bovine serum albumin (BSA) was selected as the model protein. The novel membrane has the advantages of several concepts, such as, the easy mass transport of cryogel, the multiple weak interactions of ionic liquid with protein, high selectivity of molecularly imprinted polymer, and continuous separation of membrane separation. The membrane was characterized by scanning electron microscopy (SEM), Fourier transform infrared spectrum (FT-IR), thermal gravimetric analysis (TGA), and X-ray photoelectron spectroscopy (XPS). Ovalbumin (Ova), lysozyme (Lys), and bovine hemoglobin (BHb) were selected as reference proteins to examine the selective recognition of BSA on MICM. The results of SEM images and the swelling ratios showed that MICM had a larger amount of interconnected supermacropores compared with NMICM, which was beneficial for BSA to be adsorbed onto and pass through MICM. The adsorption and permeation results indicated that MICM had better recognition selectivity and permselectivity to the objective protein BSA than NMICM. Overall, the results showed that the functionalized ionic liquid was a good choice to prepare supermacroporous MICM via cryopolymerization for selective recognition of BSA. © 2018 Wiley Periodicals, Inc. J. Appl. Polym. Sci. 2018 , 135 , 46740.
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CHINESE JOURNAL OF CHEMICAL ENGINEERING
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2018
·
IF 1.712
Xianghong Lu,Jiajian Zhu,Xing Qian,Jianbing Ji
Methyl linolenate was separated from its analogues by a new extraction system constructed by solvent, imidazolium based ionic liquids and cuprous salt. Firstly, the effect of ionic liquid on the dissolution of CuCl in acetonitrile , N , N -dimethylformamide (DMF), methanol and water was evaluated by visual observation. [C 4 Mim][Cl] can improve the dissolution of CuCl in acetonitrile. Then, for the new system as acetonitrile-ILs-CuCl, extraction equilibrium, distribution ratio and selectivity of methyl linolenate and its analogues were determined by gas chromatography analysis and the mass balance. The extraction time, IL structures and CuCl concentrations were investigated. Distribution ratio decreased slightly, but selectivity increased significantly with the addition of CuCl, [C 4 Mim][Cl] or [C 4 Vim][NTF 2 ] into acetonitrile. [C 4 Vim][NTF 2 ] had higher selectivity than [C 4 Mim][Cl]. But the selectivity of the system combining CuCl with [C 4 Vim][NTF 2 ] was much lower than with [C 4 Mim][Cl]. For the CuCl-[C 4 Mim][Cl]-acetonitrile, the extraction efficiency was better than CuCl-acetonitrile, increasing Cu + concentration effectively improved the separation selectivity when ratio of CuCl/[C 4 Mim][Cl] was less than 1. Compared with previous aqueous AgNO 3 extractions, the method of using CuCl is a much cheaper and practical way to enrich unsaturated fatty acid .
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JOURNAL OF AGRICULTURAL AND FOOD CHEMISTRY
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2018
·
IF 3.412
Jiale Yang,Chen Fan,Gang Tang,Wenbing Zhang,Hongqiang Dong,You Liang,Yanfei Wang,Mingqiang Zou,Yongsong Cao
To elucidate the relationship between the structure of ionic liquid (IL) and its enrichment ability to trace pesticides from an environmental water sample, a series of imidazole-based ILs were synthesized to extract four fungicides (boscalid, cyprodinil, fluazinam, and pyrimethanil) through an in situ ionic liquid dispersive liquid–liquid microextraction method. The results showed that aromatic heterocyclic monocation ionic liquids (MILs) had better extraction ability to fungicides than other three alicyclic heterocyclic MILs. Dication ionic liquids (DILs) with the four carbons at the side chain had better ability to extract fungicides than MILs, and DILs with a long bridge carbon chain had better recoveries of fungicides with low Kow values. The proposed method showed high mean enrichment factors and high recoveries of the fungicides from real water samples. The rules of the relationship between the structure of IL and enrichment ability are instructive to the application of ILs in pretreatment of complex substances.
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ENERGY CONVERSION AND MANAGEMENT
·
2018
·
IF 6.377
Dongren Cai,Yiwei Xie,Ling Li,Jieyong Ren,Xiaocheng Lin,Ting Qiu
With the combination of molecular simulation and relevant experiments, the efficient Brønsted-Lewis acidic ionic liquid (IL) was designed and synthesized for biodiesel production from soapberry oil. In molecular simulation, 4-methylthiazole (MT) is proved to be the best matrix for IL preparation via electrostatic potential analysis and proton affinity analysis, and it also is verified by experiments. In orthogonal experiment, the relationship in catalytic activity between Brønsted-Lewis acidic IL and corresponding materials (Brønsted acidic IL and metal chloride) was revealed. Meanwhile, [Ps-MTH][CF 3 SO 3 ] and FeCl 3 are verified as the best materials for preparation of Brønsted-Lewis acidic IL, and [Ps-MTH][CF 3 SO 3 ]-FeCl 3 ( x = 0.65) is determined as the most efficient catalyst in the end. The Lewis acidity, Brønsted acidity and interaction of [Ps-MTH][CF 3 SO 3 ] and FeCl 3 in [Ps-MTH][CF 3 SO 3 ]-FeCl 3 ( x = 0.65) were characterized by FT-IR. And the catalytic mechanism of transesterification catalyzed by prepared IL was clarified. In order to maximize the biodiesel yield, optimization of process variables was conducted using Box-Behnken response surface methodology. The 97.04% of high biodiesel yield is obtained under the optimum conditions: reaction temperature was 127 °C, molar ratio (methanol to soapberry oil) was 27.96:1, catalyst amount was 3.06 mmol and reaction time was 8 h. Furthermore, [Ps-MTH][CF 3 SO 3 ]-FeCl 3 ( x = 0.65) presents good catalytic activity in different transesterification for biodiesel production. And its catalytic activity decreases from 97.04% to 93.59% after being used for 5 times, which reflects good reusability. The main properties of soapberry biodiesel were also measured and compared to the ASTM D6751 standard.
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JOURNAL OF CHROMATOGRAPHY A
·
2018
·
IF 3.716
Manman Han,Wan Li,Rui Chen,Yangyang Han,Xiuhua Liu,Tingting Wang,Huaizhong Guo,Xiaoqiang Qiao
In this study, a novel amino acid and ionic liquid dual organically functionalized reagents modified polyhedral oligomeric silsesquioxane methacryl substituted (POSS-MA) based hybrid monolithic column (POSS-VBI-Cys) was designed and reported. With amino acid L-cysteine and ionic liquid 1-vinyl-3-butylimidazolium bromide as dual monomers, POSS-MA as the crosslinker, the new POSS-VBI-Cys hybrid monolithic column could be facilely fabricated via the “one-pot” free radical copolymerization and thiol-ene click reaction. Because of the introduction of polar amino acid L-cysteine, the new POSS-VBI-Cys column exhibited attenuated hydrophobicity in reversed-phase liquid chromatography separation. Polar amides, nucleosides and nucleic acid bases displayed strong retention on the POSS-VBI-Cys column and could be successfully separated. Furthermore, the new POSS-VBI-Cys column displayed good separation selectivity for model glycoproteins and non-glycoproteins mixture and it was also successfully used for the purification and separation of TARG1 protein from its originally expressed sample. In the future research, we will further exploit its performances for separation of intact proteins and in-depth proteome applications.
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JOURNAL OF CHROMATOGRAPHY A
·
2017
·
IF 3.981
Guifen Zhu,Xia Gao,Xiaolong Wang,Jianji Wang,Jing Fan
To illuminate the influence mechanism of anionic structure of ionic liquids (ILs) on the adsorption performance of surface molecularly imprinted polymers (MIPs), in this work, six newly designed MIPs were prepared on the surface of amino-poly(styrene-divinylbenzene) particles by using imidazolium ILs with the same cation [C 4 mim] + but different anions (Cl, CH 3 SO 3 , PF 6 , BF 4 , C 4 F 7 O 2 , C 4 F 9 SO 3 ) as template molecules, methacrylic acid as functional monomer, and ethylene dimethacrylate as cross-linker. The resulting MIP materials were characterized by IR and SEM, and the influence of hydrogen bond accepting ability of anions on the adsorption performance of the MIPs for the ILs was investigated in acetonitrile. It was found that adsorption capacity of the MIPs towards the ILs decreased in the order MIP [C4mim][Cl] > MIP [C4mim][C4F7O2] ≥ MIP [C4mim][BF4] and MIP [C4mim][CH3SO3] > MIP [C4mim][C4F9SO3] > MIP [C4mim][PF6] , which is in good agreement with the ability of anions of the ILs to form hydrogen bonds. Ultraviolet, 1 H-NMR and 35 Cl-NMR spectroscopy was then used to study the interactions of anions of the ILs with the functional monomer. It was found that the hydrogen bond interaction between anions of the ILs and acidic proton of the functional monomer was the main driving force for the high adsorption selectivity of the imprinted polymers, and the stronger hydrogen bond interaction indicates higher binding capacity and higher selectivity of the polymers towards the ILs. It was also verified that the ILs with stronger hydrogen bond accepting ability of anions could be selectively extracted by the corresponding IL-MIPs. These results may provide new insight into the recognition mechanism of MIPs for ILs, and are also useful for the rational design of this new class of imprinting materials.
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Polymer Chemistry
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2011
·Vol. 2
·期 10
·2306-2315
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IF 0
Yubing Xiong,Yujiao Wang,Hong Wang,Rongmin Wang
Highly cross-linked polymeric nanoparticles (CLPNs) were prepared via a facile one-step synthesis, and these nanoparticles are effective catalysts for CO2 cycloaddition with epoxides. In this study, CLPNs were synthesized by radical copolymerization of 4-vinylbenzyl-tributylphosphorous chloride (PIL) and ethylene glycol dimethacrylate (EGDMA) in selective solvent, such as C1∼C5 alcohols. The results revealed that spherical nanoparticles with the mean diameter range of 10–100 nm could be prepared in these alcohols, and the size of the CLPNs could be facilely tuned by the feed ratio of EGDMA to PIL. The CLPNs were characterized using dynamic light scattering, scanning electron microscopy, transmission electron microscopy, atomic force microscopy, thermogravimetric analysis, atom absorbance spectrometry, and Fourier transform infrared spectroscopy techniques. In addition, CLPNs can be exploited as highly active and selective catalyst for the cycloaddition of CO2 to epoxides. The effects of parameters, such as reaction temperature, pressure, reaction time, and catalyst amount, on the cycloaddition reaction were investigated. As a result, excellent yield (100%) and selectivity (100%) of cyclic carbonates could be achieved under mild conditions (0.1 g CLPNs, 3.0 MPa CO2, 140 °C and 3 h) without the addition of any solvents or co-catalysts. Unexpectedly, the CLPNs could be dispersed in the products homogeneously, which resulted in the extremely high activity and selectivity. At the same time, the CLPNs could be easily separated by filtration after pouring the reaction mixture into toluene. CLPNs could be recycled six times with less than 1.5% loss of catalytic activity.
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Soft Matter
·
2015
·Vol. 11
·期 23
·4717-4722
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IF 4.029
Tianxiang Yin,Jiequn Wu,Shuzhen Wang,Weiguo Shen
The aggregation behaviors of surface active ionic liquid 1-butyl-3-methylimidazolium bis(2-ethylhexyl) sulfosuccinate in aqueous solutions were investigated by conductometry, densimetry, fluorimetry, 1H nuclear magnetic resonance (1H NMR) spectroscopy, dynamic light scattering (DLS), and transmission electron microscopy (TEM), which confirmed two distinguished critical concentrations. The first critical concentration was believed to be the critical aggregation concentration (CAC), where two different types of aggregates were formed, namely, micelles with the size of 10 nm and vesicles with the size of 100 nm. The second critical concentration at two-fold CAC was suggested to be resulting from the insertion of the imidazolium cations into aggregates.
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FOOD CHEMISTRY
·
2015
·
IF 3.391
Xuemin Chen,Yanhui Ma,Danchao Chen,Ming Ma,Chunya Li
1-[3-(tert-Butoxycarbonylamino)propyl]-3-[3-(N-pyrrole)propyl]imidazolium tetrafluoroborate [( t -Boc-APPPI)BF 4 ], which is a novel pyrrolyl-functionalized ionic liquid, was synthesized and characterized. Subsequently, it was electrochemically deposited onto a glassy carbon electrode surface to fabricate a polymerized ionic liquid film electrode. X-ray photoelectron spectroscopy, scanning electron microscope and electrochemical impedance spectroscopy were used to confirm the successful polymerization of ionic liquid. Voltammetric behaviors of hexestrol at the film electrode were investigated. The oxidation peak slightly shifted towards positive potential, however, dramatically increased in peak current. Experimental conditions for hexestrol determination were optimized. The oxidation peak current is linear with hexestrol concentration in the range of 1.0 × 10 −8 –1.0 × 10 −5 mol L −1 . The detection limit is estimated to be 2.1 × 10 −9 mol L −1 (S/N = 3). Hexestrol in chicken meat was determined using the film electrode with good accuracy.
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JOURNAL OF MEMBRANE SCIENCE
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2017
·
IF 6.035
Fengxiang Liu,Shuang Wang,Jinsheng Li,Xue Tian,Xu Wang,Hao Chen,Zhe Wang
A series of polybenzimidazole containing hydroxyl groups (PBIOH)/ionic-liquid-functional silica (ILS) composite membranes (PBIOH-ILS) have been successfully prepared for the high temperature proton exchange membrane fuel cells (HT-PEMFCs). These ionic-liquid-functional silica (ILS) nanoparticles , which germinate from the polymer chains by an in situ sol-gel reaction, enhance the performance of polybenzimidazole-based composite membranes. Fourier transform infrared spectroscopy and X-ray photoelectron spectroscopy were used to characterize and confirm the Si-O-Si structure in the membranes. The PBIOH-ILS composite membranes have shown excellent thermal stability, oxidative stability and improved mechanical strength . Considering the trade-off of mechanical properties and proton conductivity, 5% ILS in weight was demonstrated to be the optimum content in the membranes. The proton conductivity was significantly enhanced because the ILS nanoparticles with high specific area in the membranes could absorb more phosphoric acid , which just like stones flooded by the sea after doping with phosphoric acid. The doping level of PBIOH-ILS 5 was as high as 7.54 after doping with phosphoric acid for 48 h and 9.65 after doping with phosphoric acid for 72 h. High doping levels lead to high proton conductivities. The PBIOH-ILS 5 had a proton conductivity of 0.106 S cm −1 at 170 °C, which is higher than some of the known PBI-based membranes measured under similar conditions.
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SENSORS AND ACTUATORS B-CHEMICAL
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2016
·
IF 4.758
Huimin Duan,Xiaojiao Wang,Yanhui Wang,Jianbo Li,Yuanling Sun,Chuannan Luo
Mainly, ionic liquid (IL) was used as functional bridging agent and surface modifier to obtain phenylboronic acid modified-IL functionalized GO@Fe 3 O 4 nanoparticles (GO@Fe 3 O 4 @IL/PBA) with reversible covalent binding properties with cis -diol containing compounds particularly. Then GO@Fe 3 O 4 @IL/PBA with the properties of high surface area and easy separation was designed as supporting material to prepare Horseradish Peroxidase (HRP) SMIP which then was characterized by SEM , XRD and FTIR . The adsorption capacity of GO@Fe 3 O 4 @IL/PBA-SMIP to HRP was researched to be 8.8 g/g, and the adsorption model and adsorption kinetics of GO@Fe 3 O 4 @IL/PBA-SMIP to HRP followed Langmuir adsorption isotherm and pseudo second-order model while the washing process was superior with acetic acid than NaOH solutions. Possessing the merit of improving selectivity, GO@Fe 3 O 4 @IL/PBA-SMIP was introduced into CL biosensor which could linearly respond to HRP in the range of 1.0 × 10 −4 –8.0 × 10 −3 mg/mL with a detection limit 2.9 × 10 −5 mg/mL. Finally, the proposed GO@Fe 3 O 4 @IL/PBA-SMIP-CL biosensor was used to detect the HRP in samples with satisfied results and the recoveries were ranged from 87% to 107%.
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JOURNAL OF CHROMATOGRAPHY A
·
2016
·
IF 3.926
Mian Wu,Liying Wang,Baizhao Zeng,Faqiong Zhao
A poly(3,4-ethylenedioxythiophene)-ionic liquid polymer functionalized multiwalled carbon nanotubes (PEDOT-PIL/MWCNTs) composite solid-phase microextraction (SPME) coating was fabricated by electrodeposition. After being dipped in Nafion solution, a Nafion-modified coating was obtained. The outer layer Nafion played a crucial role in enhancing the durability and stability of the coating, thus it was robust enough for replicated extraction for at least 150 times without decrease of extraction performance. The Nafion-modified coating exhibited much higher sensitivity than commercial coatings for the direct extraction of carbamate pesticides in aqueous solutions, due to its strong hydrophobic effect and π–π affinity based enrichment. When it was used for the determination of carbamate pesticides in combination with gas chromatography-flame ionization detection, good linearity (correlation coefficients higher than 0.9981), low limits of detection (15.2–27.2 ng/L) and satisfactory precision (relative standard deviation <8.2%, n = 5) were achieved. The developed method was applied to the analysis of four carbamate pesticides in apple and lettuce samples, and acceptable recoveries (i.e. 87.5–106.5%) were obtained for the standard addition.
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