TALANTA
·
2016
·
IF 4.035
Qian Wen,Yuzhi Wang,Kaijia Xu,Na Li,Hongmei Zhang,Qin Yang,Yigang Zhou
Amino functional dicationic ionic liquid (AFDCIL) was prepared and then coated on the surface of magnetic graphene oxide (GO) as a new magnetic adsorbent (Fe@GO@AFDCIL) for the magnetic solid-phase extraction (MSPE) of protein. The Fe@GO@AFDCIL composite was characterized by vibrating sample magnetometer (VSM), X-ray diffraction (XRD), Fourier transform infrared spectrometry (FT-IR), thermal gravimetric analysis (TGA), field emission scanning electron microscopy (FESEM) and zeta-potential nanoparticles . The bovine hemoglobin (BHb) was used as the analyte, and the extraction performance of Fe@GO@AFDCIL was investigated in the MSPE procedure. The concentration of BHb in samples was determined by a UV–vis spectrophotometer. A comparative investigation of Fe@GO@AFDCIL composite and traditional IL-coated Fe@GO composites (Fe@GO@IL) exhibited the benefits of Fe@GO@AFDCIL. The adsorbed BHb could be eluted from the Fe@GO@AFDCIL by 4% sodium dodecyl sulfate (SDS) solution. The Fe@GO@AFDCIL exhibited favorable stability which could be reused at least 15 times. Under the optimized condition, the real samples were investigated, which demonstrated that the Fe@GO@AFDCIL was able to be applied in extracting bovine hemoglobin (BHb) from real biological samples.
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高影响因子
FUEL
·
2016
·
IF 3.611
Pengcheng Hu,Yadong Wang,Xianghai Meng,Rui Zhang,Haiyan Liu,Chunming Xu,Zhichang Liu
Alkylate is an ideal blending component for motor gasoline. The alkylation of isobutane with 2-butene to produce high-quality alkylate was catalyzed by several amide-AlCl 3 -based ionic liquid (IL) analogues with different structures and CuCl modification. The influences of the amide structure, amide/AlCl 3 molar ratio, and CuCl modification on the catalytic performance were investigated in an autoclave operated in semicontinuous mode. Results showed that the N -methylacetamide-AlCl 3 -based IL analogue (molar ratio of N -methylacetamide to AlCl 3 was 0.75, marked as 0.75NMA-1.0AlCl 3 ) with bidentate coordination and low viscosity was an efficient catalyst for isobutane alkylation. Furthermore, CuCl modification further enhanced the catalytic performance of 0.75NMA-1.0AlCl 3 . The selectivity of C8 increased from 76.18 wt% to 94.65 wt%, in which the molar ratio of trimethylpentanes to dimethylhexanes (TMPs/DMHs ratio) and the research octane number (RON) of alkylate reached up to 14.98 and 98.40, respectively. The effects of reaction conditions on the alkylation performance were investigated in an autoclave operated in batch mode. The results indicated that the alkylation of isobutane with 2-butene catalyzed by CuCl-modified 0.75NMA-1.0AlCl 3 was a short-time and fast reaction. The optimal reaction temperature, reaction time, stirrer speed, and isobutane/2-butene molar ratio were 15 °C, 30 s, 1500 r/min, and 100:1, respectively. Under these optimal reaction conditions, the selectivity of C8, TMPs/DMHs ratio, and RON were 84.10 wt%, 14.86, and 96.54, respectively.
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Scientific Reports
·
2017
·Vol. 7
·期 1
·1-10
·
IF 4.259
Zhang Xueqin,Wang Huihui,Liu Chuanfu,Zhang Aiping,Ren Junli
Ring-opening graft polymerization (ROGP) of l -Lactide ( l -LA) is a practical method of altering the physical and chemical properties of lignocellulose. Previous studies have mainly investigated cellulose and tin-based catalysts, particularly of tin(II) 2-ethylhexanoate (Sn(oct) 2 ), at high temperatures and reported low graft efficiencies. In the present study, ROGP of l -LA was successfully achieved on xylan-type hemicelluloses in ionic liquid (IL) 1-allyl-3-methylimidazolium chloride ([Amim]Cl) using 1,8-diazabicyclo[5.4.0]undec-7-ene (DBU) as an effective organic catalyst. Mild reaction condition (50 °C) was used to limit transesterification, and thus enhance the graft efficiency. The hydroxyl groups on xylan acted as initiators in the polymerization, and DBU, enhanced the nucleophilicity of the initiator and the propagating chain. Xylan- graft -poly( l -Lactide) (xylan- g -PLA) copolymer with a degree of substitution (DS) of 0.58 and a degree of polymerization (DP) of 5.51 was obtained. In addition, the structures of the xylan- g -PLA copolymers were characterized by GPC, FT-IR and NMR, confirming the success of the ROGP reaction. Thermal analysis revealed that the copolymers exhibited a single glass-transition temperature ( T
g ), which decreased with increasing molar substitution (MS). Thus, modification resulted in the graft copolymers with thermoplastic behavior and tunable T
g .
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INTERNATIONAL JOURNAL OF BIOLOGICAL MACROMOLECULES
·
2017
·
IF 3.671
Chaofan Ding,Yue Li,Yanhui Wang,Jianbo Li,Yuanling Sun,Yanna Lin,Weiyan Sun,Chuannan Luo
Magnetic hydroxyethyl cellulose/ionic liquid (MHEC/IL) materials were fabricated through a facile and fast process and their application as excellent adsorbents for hydroquinone was also demonstrated. The thermal stability, chemical structure and magnetic property of the MHEC/IL were characterized by the Scanning electron microscope (SEM), Transmission Electron Microscope (TEM), Fourier transform infrared spectrometer (FT-IR) and X-ray diffraction (XRD), respectively. The adsorbents were used for the removal of hydroquinone from simulated wastewater with a fast solid–liquid separation in the presence of external magnetic field. The influence of various analytical parameters on the adsorption of hydroquinone such as pH, contact time and initial ion concentration were studied in detail. The results showed that the maximum adsorption capacity was 335.68 mg g −1 , observed at pH 5 and temperature 30 °C. Equilibrium adsorption was achieved within 30 min. The kinetic data, obtained at the optimum pH 5, could be fitted with a pseudo-second order equation. Adsorption process could be well described by Freundlich adsorption isotherms. The obtained results indicated that the impregnation of the room temperature IL significantly enhances the removal efficiency of hydroquinone. The MHEC/IL may be suitable materials in phenols pollution cleanup if they are synthesized in largescale and at low price in near future.
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RSC Advances
·
2017
·Vol. 7
·期 18
·11030-11040
·
IF 3.108
S. Zhang,L. Ma,R. Dong,C. Y. Zhang,W. J. Sun,M. J. Fan,D. S. Yang,F. Zhou,W. M. Liu
Anti-corrosion benzotriazole ionic liquid (IL, BTAP4444) was synthesized by neutralizing 1H-benzotriazole (BTAH) with terabutylphosphonium hydroxide (P4444OH). The physicochemical and tribological properties of BTAP4444 were measured and the results indicated that it had good lubricating properties for steel/steel, steel/copper and steel/aluminum friction pairs in reducing the friction coefficient and wear volume, especially when it worked for the steel/copper friction pair both at room temperature (RT) and 100 °C. Good performances were also found in terms of its anti-corrosion ability, thermal and hydrolysis stability, and viscosity temperature characteristics compared with commercially available synthetic oil poly-alpha-olefin (PAO 10) and traditional IL 1-butyl-3-methyl imidazolium tetrafluoroborate (bmimBF4). The designing purpose of BTAP4444 is to enhance the anti-corrosion ability of the IL lubricant attributed to the introduction of a nitrogen heterocyclic structure, 1H-benzotriazole, which is normally used as antirust and corrosion inhibitor in mechanical engineering. The corrosion test results confirm our assumption and BTAP4444 shows excellent anti-corrosion ability for all the used friction pairs including steel/steel, steel/copper and steel/aluminum contacts.
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ENERGY & FUELS
·
2017
·
IF 3.091
Xiaocai Meng,Jianying Wang,Haichao Jiang,Xinle Shi,Yongqi Hu
A functional 2-ethyl-4-methylimidazole alanine ([Emim][Ala]) ionic liquid was synthesized. Its density, viscosity, and surface tension were measured at the temperature range from 293.15 to 343.15 K at atmosphere pressure. The solubility of SO2 in pure [Emim][Ala] ionic liquid and the binary mixture of [Emim][Ala] and water was also investigated. The absorption\desorption mechanism of SO2 was proposed on the basis of 13C nuclear magnetic resonance and Fourier transform infrared spectroscopy. Results showed that SO2 was captured as ammonia sulfonic acid ester by pure [Emim][Ala], while for the binary mixture of [Emim][Ala] and water, the final product of SO2 absorption is alanine and [Emim]+[HSO3]−/[Emim]+2[SO3]2–.
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Energy & Environmental Science
·
2015
·Vol. 9
·期 1
·224-231
·
IF 20.523
Lina Wang,Jingyuan Liu,Shouyi Yuan,Yonggang Wang,Yongyao Xia
Li–S batteries generally suffer from severe self-discharge when resting due to an internal polysulfide shuttle effect. Soluble long-chain polysulfide species (Li2Sx, 4 ≤ x ≤ 8) would continue to dissolve and migrate to the negative side to react with metallic Li. Here, we demonstrate pronounced suppression of polysulfide shuttle using an ionic liquid of the N-methyl-N-propylpiperidinium bis(trifluoromethanesulfonyl)imide (PP13TFSI)-based electrolyte. When working in combination with LiNO3, zero self-discharge can be achieved to rest a full-charged Li–S cell for two days. The fascinating study clearly demonstrates that a promising practical Li–S battery with low self-discharge depends on both improvements on polysulfide diffusion control and Li-metal stabilization.
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Journal of Materials Chemistry A
·
2015
·Vol. 3
·期 15
·7919-7928
·
IF 7.443
Ying Tang,Beibei Tang,Peiyi Wu
A temperature-responsive composite membrane with tunable responsive behavior was prepared by covalently grafting a polymeric ionic liquid (PIL) functionalized temperature-responsive copolymer onto the brominated poly(2,6-dimethyl-1,4-phenylene oxide) (BPPO) supporting membrane. The “switch” effect of the composite membrane can be facilely adjusted by tuning the counter-ion of PIL units of the grafted copolymer based on the transformation between hydrophilicity and hydrophobicity of PIL. The response temperature of the composite membrane was decreased with increasing the content of hydrophobic PIL units. Both the pure water flux and rejection of dyes and polyethylene glycol (PEG) of the composite membrane show a good responsiveness with changing the temperature. The study provides an easily available, flexible and effective method for the design and preparation of a temperature-responsive membrane with tunable responsive behavior to satisfy various applications.
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MICROCHIMICA ACTA
·
2014
·Vol. 181
·期 5
·565-572
·
IF 3.719
Ma Ming,Tu Xiaojing,Zhan Guoqing,Li Chunya,Zhang Shenghui
The ionic liquid 1-butyl -3-[3-(N-pyrrole)-propyl]imidazolium tetrafluoroborate was employed to fabricate a glassy carbon electrode (GCE) modified with a porous film of a polymerized ionic liquid. The resulting film electrode was treated with sodium dodecyl sulfonate solution to exchange the terafluoroborate anions by dodecyl sulfonate groups. This was confirmed by X-ray photoelectron spectroscopy. The morphology of the modified GCE was characterized by scanning electron microscopy and revealed a nanoporous surface. The electrochemical properties of this film electrode were studied by electrochemical impedance spectroscopy using the hexacyanoferrate(II/III) system as an electroactive probe. The response to bisphenol A was investigated by voltammetry. Compared to the unmodified GCE, the oxidation potential is positively shifted, and the oxidation peak current is strongly increased. Experimental conditions were optimized and resulted in an oxidation peak current that is linearly related to concentration of bisphenol A in the 10 nM to ~ 10 μM range. The detection limit is 8.0 nM (at S / N = 3). The electrode was successfully applied to the determination of bisphenol A in leachates of plastic drinking bottles, and its accuracy was verified by independent assays via HPLC.
A poly{1 -butyl -3 -[3 -(N -pyrrole)propyl] imidazolium dodecyl sulfonate ionic liquid} nanoprous film electrode was fabricated with potential step technique and anionic exchange. The obtained polymerized ionic liquid film electrode was demonstrated possessing enhanced effects for bisphenol A determination.
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CRYSTENGCOMM
·
2013
·Vol. 15
·期 32
·6424-6429
·
IF 3.879
Sanying Li,Wei Wang,Lei Liu,Jinxiang Dong
Protic ionic liquids (PILs) are a subset of ionic liquids, which are cost-effective and easily produced through the combination of a Brønsted acid and a Brønsted base. In this work, we have taken an organic amine, triethylenetetramine (TETA), as an example to form a PIL with acetic acid, and described the ionothermal synthesis of zinc phosphate in a PIL for the first time. Two crystalline zinc phosphate materials, ZnPO–TETA1 and ZnPO–TETA2, were successfully produced by using this PIL as the solvent and template. Powder X-ray diffraction, SEM, TGA and CHN analysis were used to characterize the two materials. The two crystalline solids are very similar to two known zinc phosphates. ZnPO–TETA1 has an open-framework and ZnPO–TETA2 has a ladder structure, and the TETA cation was incorporated into their final structure to balance the framework negative charge. It was found that the P/Zn ratio is crucial to the phase selectivity in a protic ionic liquid. Low P/Zn ratios favor the structure with higher dimensions and high P/Zn ratios tend to form the lower dimensional structures.
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CARBOHYDRATE POLYMERS
·
2014
·
IF 3.916
Dong Tian,Yangyang Han,Canhui Lu,Xinxing Zhang,Guiping Yuan
In this paper, we demonstrated that acidic ionic liquids (ILs) can be used as “quasi-homogeneous” catalysts for the efficient acetylation of cellulose. Unlike existing techniques that use large amount of ILs as solvent to dissolve and acetylate cellulose, a small amount of acidic ILs was used as catalyst in this study to overcome the low efficiency associated with relatively high viscosity and costs of ILs during homogeneous acetylation. Fully substituted cellulose acetate with a conversion of 88.8% was obtained by using only 9 mol% IL 1-vinyl-3-(3-sulfopropyl) imidazolium hydrogen sulfate as catalyst, which is much higher than that of common commercialized solid acid catalysts. The degree of substitution and solubility of the obtained cellulose acetate can be facilely controlled by varying the concentration of ILs and reaction time. The dual function of swelling and catalyzing of acidic ILs for the acetylation of cellulose is responsible for the excellent catalytic performance.
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CHINESE JOURNAL OF POLYMER SCIENCE
·
2014
·Vol. 33
·期 2
·245-255
·
IF 1.42
Zhang Di,Yin Jun,He Fei,Ge Ni-lin,Wu Zong-quan,Ding Yun-sheng
We report on the preparation of a well-defined star-shaped tricationic ionic liquid possessing three arms of poly(ethylene glycol) functionalized imidazolium rings. Remarkable solubility was found in most of the organic solvents we used. Thermogravimetric analysis (TGA) exhibited excellent thermal stability and two distinct decomposition temperatures were attributed to two kinds of chemical degradation. Differential scanning calorimetry (DSC) was further employed to investigate the thermal phase transitions, that three different signals ( T
g , T
c , and T
m ) were shown upon the second heating process. Moreover, CH 2 Cl 2 solution of the ionic liquid expressed an excitation-wavelength dependent fluorescence response, leading to the facile modulation of photoluminescence behavior. This work represents an example of utilizing molecular design to construct novel ionic liquids and endow further potential to be used in the engineering materials.
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