JOURNAL OF MEMBRANE SCIENCE
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2019
·
IF 7.015
Jian Yin,Chenchen Zhang,Yunfei Yu,Tingyu Hao,Hua Wang,Xiaoli Ding,Jianqiang Meng
Crosslinked poly(ionic liquid) (PIL) and poly(ionic liquid)-ionic liquid (PIL-IL) based membranes with tunable micromolecular structure have been synthesized in a simple way to optimize their CO 2 capture performance. Amino-terminated PILs of two molecular weights (MW) were synthesized via the Debus-Radziszewski multicomponent reaction and then reacted with two commercial glycidyl ether crosslinkers, (polyoxyethylene bis(glycidyl ether) and trimethylolpropane triglycidyl ether). The effects of the PIL MW, crosslinker type and content, and IL content on CO 2 /N 2 permeation-separation performance were systematically investigated. For the neat PIL membranes, both the utilization of ether-containing crosslinker and an increase in the crosslinker content increased the CO 2 solubility and diffusivity , with the best PILs membrane exhibiting an excellent CO 2 permeability of 170 Barrer and a CO 2 /N 2 permselectivity of 36. For the PIL-IL membranes, an increase in the IL content increased the CO 2 solubility and diffusivity, but also resulted in a decrease in the diffusivity selectivity. The best permeation-selectivity performance belongs to a PIL-IL membrane that showed a CO 2 permeability of 2070 Barrer and a CO 2 /N 2 permselectivity of 24.6. Among all the PIL-IL membranes reported in literature, this PIL-IL membrane demonstrated the highest permeability and also a cost-effective permselectivity, with its separation performance approaching the 2008 Robeson upper bound.
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高影响因子
PHYTOCHEMICAL ANALYSIS
·
2019
·Vol. 31
·期 2
·242-251
·
IF 1.963
Luwei Fang,Jinfeng Xie,Liangwen Lin,Minglei Tian,Kyung Ho Row
Introduction Ephedrine is a typical compound found in lots of plant species that is used in several medicines for the treatment of asthma and bronchitis. However, excess amounts are harmful to humans, so it needs to be removed. Objective This study developed a multi-phase extraction (MPE) method with a molecular imprinted polymer (MIP) coated ionic liquid (IL)-based silica (SiO 2 @IL@MIP) to simultaneously extract and separate ephedrine from Pinellia ternata , 10 medicines, and urine samples. Methods IL was immobilized on silica. Subsequently, the IL was combined with the functional monomer, followed by the addition of the crosslinker and template. The resulting sorbent was applied to the MPE, and the extraction, washing and elution solvents were evaluated. Results Fourier-transform infrared (FTIR) spectroscopy and scanning electron microscopy (SEM) confirmed the synthesis of SiO 2 @IL@MIP. A maximum adsorption amount of 5.76 mg/g was obtained at 30°C at a neutral pH. In MPE, 10.00 mL of methanol could extract all the ephedrine from Pinellia ternata . The interference was removed by washing with 4.00 mL of water, ethanol, and acetonitrile. Finally, 8.00 mL of methanol/acetic acid (99:1, v / v ) was applied as the elution solvent. The following were extracted: 5.50 μg/g of ephedrine from Pinellia ternata , 0.00–46.50 μg/g from the 10 herbal medicines, and 68.70–102.80 μg/mL in the urine samples. Conclusion The proposed method was applied successfully to the simultaneously extraction and separation of ephedrine from plants and medicines. These results are expected to provide important data for the development of new methods for the separation and purification of bioactive compounds.
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NEW JOURNAL OF CHEMISTRY
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2018
·Vol. 42
·期 11
·8791-8799
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IF 3.201
Huazi Wang,Chaoran Liu,Xiaodong Huang,Chendi Jia,Yang Cao,Lu Hu,Runhua Lu,Sanbing Zhang,Haixiang Gao,Wenfeng Zhou,Donghui Xu
In the present study, a convenient, low-cost, sensitive and environmentally friendly method for the determination of four benzoylurea insecticides (BUs) in water and tea beverage samples was developed. The alkalized luffa sponge fibers (AL) were modified by the ionic liquid 1-hexadecyl-3-methylimidazolium bromide ([C16MIM]Br) through physisorption and used as the sorbent of dispersive solid-phase extraction (DSPE). The sorbent was characterized by Fourier transform infrared (FTIR) spectroscopy, scanning electron microscopy (SEM) and thermogravimetric analysis (TGA). The retained analytes were eluted using 200 μL of methanol and then quantified by high performance liquid chromatography-ultraviolet detection (HPLC-UVD). The influences of extraction parameters of [C16MIM]Br-AL-DSPE on the BUs were thoroughly studied. Under the optimal conditions, good linearity was observed over the concentration range of 1–500 ng mL−1, with coefficients of determination greater than 0.99. The limits of detection (LODs) of the developed method were 0.14–0.21 ng mL−1 in water and 0.19–0.23 ng mL−1 in tea beverage samples. Satisfactory recoveries were achieved in the range of 72.8–89.3%, with relative standard deviations lower than 10%. Finally, the established [C16MIM]Br-AL-DSPE-HPLC-UVD method was successfully applied for the determination of BU residues in environmental water and tea beverage samples.
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Journal of CO2 Utilization
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2018
·
IF 5.503
Dandan Song,Di Li,Xuan Xiao,Chen Cheng,Somboon Chaemchuen,Ye Yuan,Francis Verpoort
A green and recyclable catalytic system based on AgBr and an ionic liquid (IL) was developed for the three-component coupling reaction of propargylic alcohols, secondary amines and carbon dioxide (CO 2 ). A series of target carbamates, especially those generated from challenging substrates, could be obtained smoothly at atmospheric CO 2 pressure in a straightforward one-pot process. Moreover, the catalyst loading reached the lowermost level ever reported. Particularly, this catalytic system exhibited robust constancy and could be reused at least 5 times with retention of high catalytic activity. It is worth noting that this is the first catalytic system which could be recycled successfully for this reaction.
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SEPARATION SCIENCE AND TECHNOLOGY
·
2018
·
IF 1.2
Yifeng Zhou,Liling Wang,Yuchuan Qin,Lichun Chen,Qing Ge,Jianwei Mao
Linderane (LDR) and norisoboldine (NOR) are two typical active compounds in Lindera aggregate (Sims.) Kosterm. In this study, a new method of sequential extraction of LDR and NOR from L. aggregate was developed by supercritical fluid extraction (SFE) and ionic liquid-based ultrasonic-assisted extraction (IL-UAE) for the first time. The suitable SFE with CO2 conditions for LDR were 60 min dynamic extraction time, 40°C temperature and 30 MPa pressure. And the optimal IL-UAE factors for NOR were 2.06 mol/L 1-butyl-3-methylimidazolium bromide ([Bmim] Br) aqueous solution, 44 mL/g liquid–solid ratio, and 67 min ultrasonic time. Compared with the traditional extraction process, the sequential methods not only can obtain higher extraction efficiency, but also can realize the selective extraction for two different kinds of constituents with less consumption of traditional organic solvent. In addition, this environmentally friendly method could be used in a large-scale industry.
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RSC Advances
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2018
·Vol. 8
·期 44
·25201-25209
·
IF 2.936
Li-rong Nie,Hang Song,Alula Yohannes,Siwei Liang,Shun Yao
A magnetic ionic liquids (MILs)-based aqueous two-phase system (MIL-ATPs) obtained by mixing with a series of inorganic salts, which involves five cholinium MILs with the piperidinyloxy radical anion is reported for the first time. Phase diagrams for the new ATPs were experimentally determined at different temperatures (298.15–318.15 K) and the liquid–liquid equilibrium data for two-phase systems were correlated according to the empirical nonlinear expression. The effects of the types of MILs, temperature and inorganic salts on the binodal curve are discussed in detail. The MIL-ATPs coupled with HPLC-UV analysis was developed in the quantitation of berberine hydrochloride in Rhizoma coptidis. Under optimal conditions, the partition coefficient of berberine hydrochloride was 127.68 with the precision values (RSD%) of 1.40% and 2.83% for intra-day (n = 6) and inter-day (n = 3), respectively. The limit of detection (LOD) and limit of quantification (LOQ) for berberine hydrochloride were 0.023 mg L−1 and 0.077 mg L−1, respectively. The recoveries were obtained in the acceptable range of 97.4–101.2%. Moreover, the content of berberine hydrochloride in the raw material of Rhizoma coptidis was measured as 123.95 mg g−1 with this method. Finally, 99.8% MIL was recovered for cycle application after the removal of berberine hydrochloride by using D101 resin. This study provides a meaningful reference for the application of MIL-ATPs with great prospects.
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ANALYTICAL AND BIOANALYTICAL CHEMISTRY
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2018
·Vol. 410
·期 28
·7357-7371
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IF 3.307
Liu Wei,Wang Ruya,Hu Fan,Wu Pinping,Huang Tao,Fizir Meriem,He Hua
The co-adsorption of mixed nonionic surfactant and imidazolium-based ionic liquid, Triton X100 (TX100), with 1-cetyl-3-methylimidazolium bromide (C 16 mimBr) adsorbed onto the surface of magnetic halloysite nanotubes (MHNTs) was used as an efficient adsorbent for simultaneous determination of amlodipine and nimodipine in urine. The designed adsorbent was characterized by TEM, TGA, FTIR, and DLS analysis methods. All the parameters that influence the extraction efficiency are optimized with the aid of response surface methodology (RSM). The effects of nonionic surfactant TX100 with different structures of ionic-liquid-coated MHNTs were investigated. Under optimum conditions, extraction recoveries of amlodipine and nimodipine were in the range of 73.8–81.2 and 94.3–96.1%, with RSDs ( n = 3) of 2.6–5.5% in spiked urine samples, respectively. The adsorption mechanism principal of mixed hemimicelles was discussed in this study. The limit of detection obtained for analytes was < 0.002 μg·mL −1 . To our knowledge, this was the first attempt using a mixed hemimicelle solid-phase extraction (SPE) based on MHNTs and nonionic surfactant and imidazolium-based ionic liquid for the simultaneous determination of amlodipine and nimodipine in biological samples.
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CHINESE JOURNAL OF POLYMER SCIENCE
·
2015
·Vol. 33
·期 6
·857-868
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IF 1.835
Du Chun-hui,Ma Xu-min,Wu Chun-jin,Cai Mei-qiang,Hu Meng-xin,Wang Ting
Polymerizable ionic liquid copolymer P(MMA- co -BVIm-Br) was synthesized by radical polymerization technique, and characterized by Fourier transform infrared spectrometry (FTIR), 1 H Nuclear magnetic resonance ( 1 H-NMR) and gel permeation chromatography (GPC). The resulting copolymer was used to prepare poly(vinylidene fluoride) (PVDF) blend membranes via a phase inversion method. The effects of the copolymer on the polymorphism, surface wettability and zeta potential ( ζ ) of the blend membranes were investigated by ATR-FTIR, contact angle instrument and zeta potential analyzer. Scanning electron microscopy (SEM and SEM-EDS) was also applied to investigate the morphology and the surface element changes of the fabricated membranes. The results indicated that P(MMA- co -BVIm-Br) copolymer existed on the surface of the membrane which made the blend membrane have a positive surface during the experimental pH range. The copolymer was also in favor of the formation of β crystal phase in PVDF membranes. The contact angle experiment indicated that P(MMA- co -BVIm-Br) copolymer could switch the wettability of the blend membranes from hydrophilic to hydrophobic by exchanging Br − anion with PF 6
− . Compared with pure PVDF membranes, the water flux and water recovery flux of the blend membranes were enhanced obviously. The results from the flux recovery ratio (FR) and total fouling ratio ( R
t ) all suggested that the blend membranes had good anti-fouling properties.
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Analytical Methods
·
2013
·Vol. 5
·期 10
·2591-2601
·
IF 1.855
Xiaojie Liu,Xiu Huang,Yuzhi Wang,Songyun Huang,Xiao Lin
An ionic liquid-based microwave-assisted extraction (IL-MAE) technique has been successfully developed for the simultaneous effective extraction of quercetin and kaempferol from Toona sinensis and Rosa chinensis which are Chinese medicinal plants. Twenty different types of ionic liquids (ILs) with different cations and anions have been synthesized and investigated. Several significant operating parameters of IL-MAE were optimized by a series of single factor experiments and orthogonal design L9 (34) experiments, respectively. Compared with ionic liquid-based maceration extraction (IL-ME), ionic liquid-based heat extraction (IL-HE) and ionic liquid-based ultrasound-assisted extraction (IL-UAE), the optimized approach was demonstrated as the optimal technique with the highest extraction efficiency and the shortest extraction time. Reversed phase high performance liquid chromatography (RP-HPLC) with ultraviolet-detection (UV-DAD) was employed for the simultaneous analysis of kaempferol and quercetin. The results indicated that the extraction amounts of quercetin from Toona sinensis extracted using [Bmim]Br and from Rosa chinensis extracted using [Omim]Br were 176.5 mg g−1 with RSD 1.2% and 134.3 mg g−1 with RSD 0.63%. And the extraction amounts of kaempferol from Toona sinensis extracted using [Bmim]Br and from Rosa chinensis extracted using [Omim]Br were 16.12 mg g−1 with RSD 0.24% and 9.070 mg g−1 with RSD 0.15%. The developed approach for analyzing quercetin was linear between the concentrations of 32.10 mg L−1 to 233.3 mg L−1 in Toona sinensis and 25.70 mg L−1 to 160.5 mg L−1 in Rosa chinensis with the regression coefficients (R) of 0.9998 and 0.9999, respectively. And for kaempferol, the developed approach was linear between the concentrations of 0.73 mg L−1 to 23.20 mg L−1 in Toona sinensis and 0.19 mg L−1 to 15.00 mg L−1 in Rosa chinensis with the regression coefficients (R) of 0.9993 and 0.9996, respectively. The recoveries of quercetin extracted by the developed methods were 96.76–104.1% in Toona sinensis and 98.40–103.3% in Rosa chinensis, and the recoveries of kaempferol were 95.75–106.3% in Toona sinensis and 98.55–102.9% in Rosa chinensis with the RSDs of lower than 3.0%. The LODs were 1.87–2.26 μg mL−1. The microstructures and chemical structures of these two researched samples before and after different extraction procedures were also investigated.
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TALANTA
·
2013
·
IF 3.498
Xinjian Song,Bing Wang,Yina Huang,Liqing Li,Ting Li,Chunya Li,Shenghui Zhang
A polymeric film modified glassy carbon electrode was electrochemically fabricated with potential step technique using 1-butyl-3-[3-(N-pyrrole)propyl] imidazolium tetrafluoroborate ionic liquid as a monomer . Followed by being treated with sodium dodecyl sulfonate solution, a hydrophobic film bearing poly{1-butyl-3-[3-(N-pyrrolyl)propyl]imidazolium dodecyl sulfonate} moiety was modified onto electrode surface. The substitution was confirmed by X-ray photoelectron spectroscopy. The morphology of the polymeric film electrode surface was characterized with scanning electron microscopy. Electrochemical behaviors of magnolol at the hydrophobic polymeric film electrode were systematically investigated with voltammetry . Compared with the unmodified glassy carbon electrode, the oxidation peak shift slightly towards positive potential and the oxidation peak current significantly increased. Under optimal conditions, the oxidation peak current was linearly related to the magnolol concentration in the range of 1.0×10 –8 to 1.0×10 –6 mol L –1 and 1.0×10 –6 to 5.0×10 –5 mol L –1 . The detection limit was estimated to be 4.55×10 –9 mol L –1 (S/N=3). The polymerized ionic liquid film electrode was successfully used to analysis magnolol in M. officinalis . The result was consistent with that obtained by high performance liquid chromatography.
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JOURNAL OF ELECTROANALYTICAL CHEMISTRY
·
2015
·
IF 2.729
Meiling Wang,Zhengnian Chen,Yaomin Chen,Chunjin Zhan,Jianwei Zhao
Positively charged gold nanoparticles (AuNPs) were self-assembled onto the surfaces of 1-allyl-3-methylimidazolium chloride (AMIM-Cl) functionalized reduced graphene oxide sheets (RGO) here. The AMIM-Cl functionalized RGO (ILRGO) loaded with AuNPs (ILRGO@AuNPs) modified glass carbon electrodes (GCEs) possess larger effective specific surface areas which can favor the adsorption of more Sudan I into the working electrode . So the ILRGO@AuNPs composites were successfully used for the fabrication of a facile and sensitive sensor for the determination of Sudan I. And the prepared sensor exhibits a broad linear range for Sudan I spanned 4 orders of magnitude from 1.0 × 10 − 10 to 1.0 × 10 − 6 M and a detection limit as low as 5.0 × 10 − 11 M (S/N = 3). It is expected that this green sensor can be applied in the determination of other similar dyes.
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JOURNAL OF CHEMICAL THERMODYNAMICS
·
2015
·
IF 2.679
Jiayi Chen,Lingxiao Chen,Yingjie Xu
Densities and viscosities of the pure ionic liquid 1,1,3,3-tetramethylguanidine imidazole ([TMG]IM) and its binary mixtures with methanol, ethanol, 1-propanol, and 1-butanol were measured at temperatures from T = (293.15 to 313.15) K. The thermal expansion coefficient, molecular volume, standard entropy, and lattice energy of [TMG]IM were obtained from the experimental density value. The temperature dependence of the viscosity of [TMG]IM was fitted to the fluidity equation. Excess molar volumes V E and viscosity deviations Δ η of the binary mixtures were calculated and fitted to the Redlich–Kister equation with satisfactory results. The result shows that the V E values of the binary mixtures are negative over the whole composition range, while Δ η values have an S-shape deviation. Temperature has little effect on the V E of the systems, but it has significant effect on the Δ η . Furthermore, the absolute values of V E for {[TMG]IM (1) + alcohol (2)} systems at the same temperature decrease with increasing carbon alkyl chain of the primary alcohol. Other derived properties, such as the apparent molar volumes, partial molar volumes, excess partial molar volumes, Gibbs free energy of activation for viscous flow, and excess Gibbs free energy of activation for viscous flow of the above-mentioned systems were also calculated.
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