JOURNAL OF CHEMICAL AND ENGINEERING DATA
·
2017
·
IF 2.323
Kai Zhang,Xianbao Cui,Tianyang Feng,Ying Zhang,Haofei Liu
Solubilities of diethyl phthalate (DEP), dicyclopentadiene (DCPD), and styrene in ionic liquid 1-ethyl-3-methylimidazolium acetate ([Emim][OAc]) were measured in the temperature range T = (283.15–353.15) K and at atmospheric pressure (101.3 kPa) the corresponding temperature–composition phase diagrams were obtained. Solubilities of DEP and DCPD in [Emim][OAc] increase with temperature but the solubility of styrene in [Emim][OAc] decreases with temperature. The ternary liquid–liquid equilibrium data for the system of styrene + glycerol + [Emim][OAc] were also determined at temperatures of 298.15, 308.15, 318.15, and 328.15 K, and the results indicate that the addition of glycerol can significantly reduce the solubility of styrene in [Emim][OAc]. For the ternary system, when the amount of glycerol is enough, the solubility of styrene in [Emim][OAc] increases with temperature. The experimental data were correlated by the nonrandom two-liquid activity coefficient model and the binary interaction parameters were obtained.
✓ 已验证
产品关联
DOI
高影响因子
CHEMICAL ENGINEERING RESEARCH & DESIGN
·
2016
·
IF 2.525
Jinbei Yang,Yaoyao Feng,Ting Zeng,Xiaoting Guo,Ling Li,Ruoyu Hong,Ting Qiu
Two new Brönsted acidic ionic liquids were prepared and characterized by NMR and FTIR. Their catalytic activities for the synthesis of biodiesel fuel via transesterification of tung oil with methanol were evaluated and compared to that of two imidazole-based ionic liquids for the first time. Among them, [Ps-N-Ch(Me) 2 ][p-TSA] exhibited the highest catalytic activity and was chosen as catalyst for further research. A study on optimizing the reaction conditions was performed by orthogonal experiment based on the single factor experiment. It was found that the ranking of the significance of factors on the biodiesel yield is as follows: molar ratio of methanol to oil > reaction temperature > reaction time > catalyst dosage. The maximum biodiesel yield reaches 98.98% under the optimal reaction conditions at a molar ratio of methanol to oil of 21:1, a reaction temperature of 120 °C, a reaction time of 2 h and a catalyst dosage of 5.0 wt.%. Moreover, the reusability experiment exhibits that the catalyst can be reused five times with negligible loss of the activity. The refined biodiesel meets the biodiesel standard ASTM D6751-07, which can be used as fuel in diesel engines.
✓ 已验证
产品关联
DOI
高影响因子
JOURNAL OF SOLUTION CHEMISTRY
·
2016
·Vol. 45
·期 3
·359-370
·
IF 1.256
Zhu Xiao,Zhang Huan,Xu Yingjie
In order to uncover the micro-structural heterogeneities in solutions of ammonium based ionic liquids, triethylamine nitrate (N 222 NO 3 ) has been synthesized using acid–base neutralization and the 1 H NMR spectra of two binary mixtures, namely N 222 NO 3 /dimethyl sulfoxide (DMSO) and N 222 NO 3 /acetone at different concentrations, have been measured at 298.15 K. The internal reference method was adopted to obtain the concentration-dependent chemical shifts of –CH 3 in N 222 NO 3 , which have been correlated using the 1 H NMR local composition (LC) model to obtain the local mole fractions. It has been revealed that within N 222 NO 3 rich region, self-association of the ionic liquid was predominant instead of N 222 NO 3 –solvent interactions. However, in the solvent rich region, N 222 NO 3 mainly interacts with solvent molecules, indicating that the self-association network of N 222 NO 3 has been greatly destroyed by solvents. In addition, the different influences of DMSO and acetone have been detected. DMSO molecules more effectively destroy the original network of the ionic liquid, due to its higher dielectric constant. Also, LC behavior in N 222 NO 3 /DMSO systems is more significant than in N 222 NO 3 /acetone, indicating that DMSO can induce more obvious heterogeneities in DMSO/N 222 NO 3 mixtures, which is consistent with physicochemical properties and cellulose solubility of solutions.
✓ 已验证
产品关联
DOI
高影响因子
ANALYTICAL AND BIOANALYTICAL CHEMISTRY
·
2016
·Vol. 408
·期 22
·6105-6114
·
IF 3.125
Wang Huili,Gao Ming,Gao Jiajia,Yu Nana,Huang Hong,Yu Qing,Wang Xuedong
In conventional microextraction procedures, the disperser (organic solvent or ionic liquid) is left in the aqueous phase and discarded after finishing the microextraction process. Because the disperser is water-soluble, it results in low extraction recovery for polar compounds. In this investigation, an ionic-liquid-based microextraction (ILBME) was integrated with salting-out assisted liquid-liquid microextraction (SALLME) to build an ionic-liquid-based, salt-induced, dual microextraction (ILSDME) for isolation of five fluoroquinolone antibiotics (FQs) with high polarity (log P , −1.0 to 1.0). The proposed ILSDME method incorporates a dual microextraction by converting the disperser in the ILBME to the extractor in the SALLME. Optimization of key factors was conducted by integrating single-factor experiments and central composite design. The optimized experimental parameters were 80 μL [C 8 MIM][PF 6 ] as extractor, 505 μL acetone as disperser, pH = 2.0, 4.1 min extraction time, and 4.2 g of Na 2 SO 4 . Under optimized conditions, high ERs (90.6–103.2 %) and low LODs (0.07–0.61 μg kg −1 ) were determined for five FQs in swine feed. Experimental precision based on RSDs was 1.4–5.2 % for intra-day and 2.4–6.9 % for inter-day analyses. The combination of ILBME with SALLME increased FQ recoveries by 15–20 % as compared with SALLME, demonstrating that the ILSDME method can enhance extraction efficiency for polar compounds compared to single-step microextraction. Therefore, the ILSDME method developed in this study has wide application for pretreatment of moderately to highly polar pollutants in complex matrices.
A dual microextraction was developed by integrating ionic-liquid-based microextraction with salting-out assisted liquid-liquid microextraction for isolation of five fluoroquinolone antibiotics (FQs) with high polarity (log P = −1.0 to 1.0). The principle of dual microextraction is based on converting the remaining disperser from the first microextraction into an extractor in the second microextraction. Single-factor experiment and central composite design were applied for optimizing operational parameters using 3D response surfaces and contour lines. Under optimized conditions, the method provided high extraction recoveries and low LODs for five FQs in swine feed. The prominent advantage of the dual microextraction is rapid and highly efficient extraction of moderately to highly polar fluoroquinolones from complex matrices
✓ 已验证
DOI
PubMed
高影响因子
SEPARATION AND PURIFICATION TECHNOLOGY
·
2016
·
IF 3.299
Yan Zheng,Liying Fang,Yan Yan,Shujie Lin,Zhaohui Liu,Yanzhao Yang
The silicone ionic liquid, 1-methyl-3-[tri-(trimethylsiloxy)]silylpropyl-imidazolium chloride ([Si 4 mim]Cl), was first used for the construction of the W/O microemulsion system and the [Si 4 mim]Cl/ n -heptane/ n -hexanol/NaCl microemulsion system was applied for palladium extraction for the first time. The stability of [Si 4 mim]Cl/ n -heptane/ n -hexanol/NaCl microemulsion system was characterized by the Turbiscan Lab. For the Pd (II) extraction by the [Si 4 mim]Cl/ n -heptane/ n -hexanol/NaCl microemulsion system, primary parameters (namely, the vibration time, the [Si 4 mim]Cl concentration, the phase ratio and the additives) affecting the palladium extraction was investigated to optimize the process. Under the optimum conditions, the extraction percentage of Pd (II) is up to 98%. Afterwards, the ionic-exchange mechanism of Pd (II) extraction by the [Si 4 mim]Cl/ n -heptane/ n -hexanol/NaCl microemulsion system was confirmed by the Job Method and analyzed by FT-IR spectra. The stripping of Pd (II) from the microemulsion phase was also studied using the NaCl solutions, indicating a high stripping efficiency. At last, the selectivity of the [Si 4 mim]Cl/ n -heptane/ n -hexanol/NaCl microemulsion system to Pd (II) from other metals (Cu (II), Co (II), Ni (II), Fe (III), Al (III) Zn (II), Ce (III), Li (I), Mg (II) and Sn (IV)) was demonstrated to be quite high. The results of our work indicate that the [Si 4 mim]Cl/ n -heptane/ n -hexanol/NaCl microemulsion system is a promising approach for Pd (II) extraction.
✓ 已验证
产品关联
DOI
高影响因子
JOURNAL OF CHEMICAL THERMODYNAMICS
·
2016
·
IF 2.196
Fangfang Ye,Jiahong Zhu,Keke Yu,Ruyu Zhu,Yingjie Xu,Jiayi Chen,Lingxiao Chen
In this work, densities and viscosities of aqueous solution of 1,1,3,3-tetramethylguanidine imidazolide ([TMG]IM) ionic liquid were measured at temperatures from T = (293.15 to 313.15) K. Volumetric properties including excess molar volumes V E , apparent molar volumes, partial molar volumes, and excess partial molar volumes were calculated from the experimental density. Viscosity deviations Δ η , Gibbs energy and excess Gibbs energy of activation for viscous flow were deduced from the viscosity. Moreover, electrical conductivities κ and refractive indices of binary mixtures of [TMG]IM with water and alcohols were determined at 298.15 K. The results show that V E values of {[TMG]IM (1) + water (2)} mixture are negative over the whole composition range, while Δ η and refractive index deviations Δ n D values exhibit positive deviations, indicating that the hydrogen bonding interaction between [TMG]IM and water is dominant. The absolute values of V E and Δ η of the mixture decrease with the increasing temperature. The V E , Δ η , and Δ n D can be fitted by the Redlich–Kister equation with satisfactory results. The concentration-dependent κ of the studied systems are fitted to Casteel–Amis equation, showing that the κ values of {[TMG]IM (1) + water (2)} mixture are much higher than those of {[TMG]IM (1) + ethanol (2)} mixture.
✓ 已验证
产品关联
DOI
高影响因子
International Journal of Polymer Science
·
2016
·
IF 1
Ming-Jie Chen,Xue-Qin Zhang,Chuan-Fu Liu,Qing-Shan Shi
Sugarcane bagasse, lignocellulosic residue from the sugar industry, is an abundant and renewable bioresource on the earth. The application of ionic liquids in sugarcane bagasse biorefinery is gaining increasing interest. The homogeneous modification of sugarcane bagasse by free radical initiated graft copolymerization of acrylate monomers using 1-allyl-3-methylimidazolium chloride as solvent was performed. A variety of sugarcane bagasse graft copolymers with different weight percent gain were prepared via adjusting the monomer dosage. FT-IR studies confirmed the success in attaching the poly(acrylate) side chains onto sugarcane bagasse. Oil absorbency studies suggested that the sugarcane bagasse graft copolymers were potential biobased materials for effective treatment of ester-based oils. SEM studies showed that the sugarcane bagasse graft copolymers displayed a dense morphology structure. Thermogravimetric analysis demonstrated that the thermal stability of sugarcane bagasse decreased after the homogeneous modification by the graft copolymerization. The present study provides an alternative strategy to convert sugarcane bagasse into a value-added functional biobased material.
✓ 已验证
产品关联
DOI
高影响因子
MATERIALS LETTERS
·
2017
·
IF 2.572
Yaping Zhang,Bin Zhen,Ruonan Li,Shuxian Meng,Xianggao Li,Yaqing Feng
In this paper, silica nanoparticles and silica coated with ionic liquid polymer nanoparticles (PIL/SiO 2 ) were prepared. They are both monodisperse and smooth spheres, and also own suitable densities and excellent chromaticity. Porous silica benefits their low density, which decreases the gravitational sedimentation and avails electrophoretic mobility. The ionic liquid polymer coating of PIL/SiO 2 not only favors hydrophobicity and dispersity stability, but also helps the enrichment of trace polar impurities around the particles, which makes for ionization effect and electrophoretic mobility. The PIL/SiO 2 show greatly improved hydrophobicity and electrophoretic mobility. The PIL/SiO 2 in the fabricated EPD prototype with thickness of 0.2 mm shows response time of 155 ms, much faster than the silica nanoparticles, TiO 2 previously reported and commercial EPDs.
✓ 已验证
产品关联
DOI
高影响因子
POLYMER ENGINEERING AND SCIENCE
·
2013
·Vol. 54
·期 1
·59-63
·
IF 1.243
Guangren Yu,Qingzeng Li,Na Li,Ziwei Man,Chenghao Pu,Charles Asumana,Xiaochun Chen
A new poly(ionic liquid) of N , N -methylenebisacrylamide (MBA)-crosslinked-poly(4-vinylbenzyltriethylammonium hexafluorophosphate)(MBA-crosslinked-P[VBTEA][PF 6 ]) is prepared through the ion exchange of KPF 6 with the precursor of MBA-crosslinked-P[VBTEA][Cl]; the precursor is synthesized by 4-vinylbenzyltriethylammonium chloride and MBA via inverse suspension polymerization. MBA-crosslinked-P[VBTEA][PF 6 ] is a thermally stable (decomposes at nearly 300°C) and porous (apparent porosity of 64.3% and specific surface of 39.12 m 2 /g) polymer particle with high purity, as indicated by Fourier transformed infrared, energy dispersive spectroscopy, thermogravimetric, scanning electron microscopy, and porous analyses. It is observed that MBA-crosslinked-P[VBTEA][PF 6 ] has good CO 2 adsorption capability of 14.04 mg/g at 0.2 MPa and 25°C, and can be recovered by desorption at vacuum and 80°C, and reused with 99% CO 2 adsorption after four cycles. POLYM. ENG. SCI., 54:59–63, 2014. © 2013 Society of Plastics Engineers
✓ 已验证
DOI
高影响因子
JOURNAL OF MOLECULAR CATALYSIS A-CHEMICAL
·
2012
·
IF 2.947
Fang Deng,Xubiao Luo,Ke Li,Xinman Tu,Shenglian Luo,Lixia Yang,Ninghui Zhou,Hongying Shu
Visible light responsive iron-doped TiO 2 (Fe 3+ /TiO 2 -IL) was synthesized by sol–gel method using 1-vinyl-3-propylimidazolium iodide (VPIM + I − ) as a reaction medium. VPIM + I − not only made the morphological and structural changes of Fe 3+ /TiO 2 -IL, but also extended its absorption edge to the visible light region. The photocatalytic activity of Fe 3+ /TiO 2 -IL was tested in the degradation of 2-nitrophenol under simulated solar light irradiation. The photocatalytic activity of Fe 3+ /TiO 2 -IL was higher than the samples prepared in the reaction medium without VPIM + I − . Moreover, the effect of pH and H 2 O 2 on the photocatalytic activity of Fe 3+ /TiO 2 -IL was also investigated. Fe 3+ /TiO 2 -IL showed high photocatalytic activity in acidic environment, and H 2 O 2 had a dual effect on the photocatalytic activity Fe 3+ /TiO 2 -IL.
✓ 已验证
产品关联
DOI
高影响因子
RESEARCH ON CHEMICAL INTERMEDIATES
·
2012
·Vol. 39
·期 6
·2857-2865
·
IF 0.697
Deng Fang,Luo Xubiao,Shu Hongying,Tu Xinman,Luo Shenglian
TiO 2 microspheres were synthesized by the sol–gel method using the ionic liquid (IL) 1-vinyl-3-propylimidazolium iodide (VPIM + I − ) as a reaction medium, then calcined at 500 °C. The samples were characterized by X-ray diffraction, scanning electron microscopy, and ultraviolet–visible (UV–Vis) diffuse reflectance spectroscopy. The phase of TiO 2 microspheres is anatase, and VPIM + I − is able to favor the growth of anatase phase and prevents the collapse of small pores. The photocatalytic activity of TiO 2 -IL was tested by degradation of 2-nitrophenol under UV light illumination. The photocatalytic activity of TiO 2 -IL was higher than that of samples prepared in the reaction medium without VPIM + I − .
✓ 已验证
产品关联
DOI
高影响因子
SPECTROSCOPY LETTERS
·
2013
·
IF 0.667
Yun-Chang Fan,Xue-Yun Gong,Jing Li,Lei Zhang,Chun-Jia Sun
The interaction of an amino-functionalized ionic liquid, 1-(2-aminoethyl)-3-butylimidazolium bromide ([NH2C2C4im]Br), with cytochrome c (cyt c) at pH 7.4 was investigated using fluorescence and UV-Vis absorption spectroscopic techniques. From the experimental results, it is found that cyt c has a strong ability to quench the intrinsic fluorescence of [NH2C2C4im]Br and the quenching mechanism is considered as a static quenching process. The binding constants and the number of binding sites (n) were calculated at different temperatures. The thermodynamic parameters such as free energy change (ΔG), enthalpy change (ΔH), and entropy change (ΔS) were calculated by thermodynamic equations. According to the results, the values of ΔG, ΔH, and ΔS are all negative, suggesting that interaction between [NH2C2C4im]Br and cyt c is spontaneous and mainly driven by hydrogen bonding and van der Waals forces.
✓ 已验证
DOI
高影响因子
危险品化学品经营许可证（带存储）