Journal of Nanomaterials
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2019
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IF 2.233
Lei Cheng,Youjun Fan,Xingcan Shen,Hong Liang
A hybrid and hierarchical nanocomposite was successfully prepared by the growth of zeolitic imidazolate framework-8 (ZIF-8) on the template of ionic liquid (IL, [Bmim][BF4]) functionalized reduced graphene oxide (IL-RGO). The structure and morphology of the IL-RGO/ZIF-8 nanocomposite were characterized by X-ray diffraction (XRD), scanning electron microscopy (SEM), Fourier transform infrared spectrometer (FTIR), and Raman spectroscopy. The results showed that RGO sheets were refrained from restacking by IL, and ZIF-8 nanoparticles grew well on the surface of IL-RGO. Owing to the synergistic effect from large surface area and excellent electrocatalytic activity of ZIF-8 and great electrical conductivity of IL-RGO, a highly sensitive sensor for dopamine (DA) can be obtained. IL-RGO/ZIF-8-modified electrode exhibits good electrocatalytic activity and electroconductive properties towards DA which were investigated by cyclic voltammetry (CV), differential pulse voltammetry (DPV), and electrochemical impedance spectroscopy (EIS). Compared with bare or IL-RGO-modified electrodes, the IL-RGO/ZIF-8-modified electrode effectively depressed the oxidation overpotential of DA. The linear response range of DA was from to with a low detection of limit . In addition, the sensor was shown to provide satisfactory stability for the determination of DA.
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JOURNAL OF SOLID STATE ELECTROCHEMISTRY
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2019
·Vol. 23
·期 6
·1903-1909
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IF 2.531
Zhang Baoguo,Shi Zhongning,Shen Lingling,Liu Xiaozhen,Xu Junli,Wang Zhaowen
A highly stable solvate ionic liquid comprising a 2:1 (mol/mol) mixture of ethylene carbonate (EC) and AlCl 3 was used for near room-temperature electrochemical codeposition of an Al-Nd alloy using chlorides as precursors. This liquid is low-cost, easy to prepare, and has high electrochemical stability. The ionic structure was analyzed by 27 Al nuclear magnetic resonance; Raman spectroscopy and the dissolution phenomenon was studied by ultraviolet-visible spectroscopy. The dissolution mechanism of NdCl 3 in this solvate ionic liquid was derived as 3[AlCl 2 (EC) n ] + + 2NdCl 3 ⇆ 2Nd(III) + 3[AlCl 4 ] − + 3 n EC. Cyclic voltammetry was used to explore the electrochemical behavior of Nd- and Al-containing species, revealing that the reduction of Al and Nd are both one-step electron-gaining processes. X-ray diffraction confirmed that an Al-Nd alloy can be obtained in the form of thermally stable Al 2 Nd by potentiostatic electrolysis at high cathode overpotential (− 3.5 V vs. Al). Although the deposited alloy layer is not dense, Al-containing solvate ILs have immense potential in green electrometallurgy because of their higher tunability and similar properties to ILs.
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ELECTROCHIMICA ACTA
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2018
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IF 5.116
Ailian Wang,Xu Liu,Shi Wang,Jie Chen,Hao Xu,Qian Xing,Liaoyun Zhang
Polymeric ionic liquid electrolytes have received great attention for use in next-generation solid lithium-ion batteries. However, most polymeric ionic liquid electrolytes require a high proportion of organic liquid plasticizer to improve the room temperature ionic conductivity . This comes at the expense of sacrificing the mechanical strength of the electrolytes. In addition, it is also difficult to establish a clear relationship between polymeric ionic liquid segments and properties of the electrolyte. Here, a copolymeric ionic liquid poly(N-(1-vinylimidazolium-3-butyl)-ammonium bis(trifluoromethanesulfonyl)imide)- co -poly(poly(ethylene glycol) methyl ether methacrylate) is synthesized and the corresponding self-standing flexible all-solid electrolyte (PVIMTFSI- co -PPEGMA/LiTFSI) is prepared via a solution-casting method. The effect of the polymeric ionic liquid segments on comprehensive properties of the electrolyte is investigated in detail by comparing the performance of PVIMTFSI- co -PPEGMA/LiTFSI with PVIM- co -PPEGMA/LiTFSI (poly(N-vinlyimidazole)- co -poly(poly(ethylene glycol) methyl ether methacrylate) based electrolyte) which contains un-ionized imidazole groups. As a result, the electrochemical window slightly decreases from 5.5 V to 5.3 V, but the ionic conductivity and interfacial behavior are both greatly improved. In Particular, the polymeric ionic liquid segments can restrain the formation of lithium dendrites . Moreover, a discharge capacity of 136 mAh g −1 at 0.1 C can be realized for the PVIMTFSI- co -PPEGMA/LiTFSI-based LiFePO 4 /Li battery that is maintained at approximately 70 mAh g −1 at 1 C at 60 °C, which is superior to that obtained for the PVIM- co -PPEGMA/LiTFSI electrolyte.
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3 Biotech
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2018
·Vol. 8
·期 4
·1-9
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IF 1.497
Gao Jing,Zheng Caiju,Tan Tingru,Liu Shucheng,Ji Hongwu
Energy efficiency ratio is significant in completely estimating lignocellulosic biomass pretreatment. In this work, rice straw (RS) was pretreated by ultra-high pressure (UHP), ionic liquid microemulsion (ILM), and a combination of UHP and ILM (ILM + UHP) at mild temperature. The chemical composition, crystalline structure, surface morphology, and enzymatic hydrolysis of untreated and pretreated RS samples were compared. After ILM pretreatment ([Emim]Ac/cyclohexane/Triton X-100/ n -butanol = 0.25/0.15/0.45/0.15) at 500 MPa, 50 °C for 4 h, the cellulose content of the regenerated RS increased by 62.5, 66.2% of the lignin was removed, 37.3% of crystallinity index decreased, and the reducing sugar yield of 89.6% was achieved. All results show that the ILM + UHP pretreatments were more effective than sole UHP or ILM treatment at low temperature.
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PubMed
高影响因子
SEPARATION AND PURIFICATION TECHNOLOGY
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2018
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IF 3.927
Yuefei Zhang,Haibing Wang,Ningjie Sun,Ruan Chi
The mechanism of adsorption of dichromate by imidazole ionic liquid-bonded silica gel was studied. Two different adsorbents for adsorption of dichromate ions were synthesized and characterized. By static adsorption experiments, when the pH was 5.6 and the initial concentration of Cr was 200 μg/mL, the adsorption capacity of 1-methylimidazole ionic liquid-bonded silica gel (SilprMmimCl) and 1-ethylimidazole ionic liquid-bonded silica gel (SilprEmimCl) for Cr (VI) was 24.03 mg/g and 16.52 mg/g, respectively. To investigate the mechanism of adsorption on molecular scale, an simplified model of SilprMmimCl and SilprEmimCl have been modeled with [Mmim]Cl, [Emim]Cl, [Mmim][Cr 2 O 7 ] and [Emim][Cr 2 O 7 ]. The structures of related models were optimized at the B3LYP/6-311+G(d, p) level. The weak interaction between cations and anions of models was analyzed by vibration analysis and bond length analysis; the features of bonds at bond critical points and the variations of bond types was studied by Atoms In Molecules (AIM) theory. Simultaneously, noncovalent interactions were characterized and visualized by analysis of Reduced Density Gradient (RDG). Finally, The sequence of intra-molecular interaction energy is [Mmim][Cr 2 O 7 ], [Emim][Cr 2 O 7 ], [Mmim]Cl, [Emim]Cl from big to small, which demonstrates why SilprMmimCl and SilprEmimCl have a good adsorption capacity for dichromate and the adsorption capacity of SilprMmimCl is slightly more than that of SilprEmimCl.
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JOURNAL OF CHEMICAL TECHNOLOGY AND BIOTECHNOLOGY
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2018
·Vol. 94
·期 1
·159-166
·
IF 2.587
Jun Li,Miaoliang Fan,Rongjin Zhang,Zheyu Tian,Jing Zeng,Yinan Song,Wenting Du
Background Ionic liquids (ILs) have advantages in terms of flexible structure and composition for the whole cell mediated biocatalytic reaction. However, the lack of design strategy for ILs has hampered the development of biocatalysis in non-aqueous medium. In the present study, to establish an efficient reaction system to obtain vital chiral compounds, a novel IL was designed by combining the superior characteristics of quaternary ammonium- and dialkyl-based cationic surfactant IL to enhance the recombinant Escherichia coli cells-catalyzed bioreduction efficiency. Results [HOEtN1,1,1][BF 4 ] was synthesized and showed excellent characteristics of low toxicity to the biocatalyst, reduced toxicity of substrate to the microbial cells and moderate increase of cell membrane permeability. In the [HOEtN1,1,1][BF 4 ]- containing reaction system, some valuable factors involved in the biocatalytic reduction of ethyl 4-chloro-3-oxobutanoate to ethyl ( S )-4-chloro-3-hydroxybutanoate were found to be: 2.5% (w/v) [HOEtN1,1,1][BF 4 ], 20% (v/v) isopropanol, 3 M COBE, pH 7.0, 30 °C, reacted for 16 h. A yield of 96.7% was obtained under the optimum conditions with above 99% enantiomeric excess value, and the proposed bioprocess was also successfully scaled up to a 5 L fermentor with a yield of 90.7%. Conclusion The developed IL [HOEtN1,1,1][BF 4 ] is a promising solvent for enhancing the efficiency of model bioreduction. It was also evaluated for broadening its application to the biosynthesis of ( R )-[3,5-bis(trifluoromethyl)phenyl] ethanol catalyzed by recombinant Escherichia coli , with remarkable success. © 2018 Society of Chemical Industry
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APPLIED CATALYSIS A-GENERAL
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2018
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IF 4.521
Yiqi Xu,Yishu Jiang,Hao Xu,Qingtao Wang,Weimin Huang,Haihua He,Yuanyuan Zhai,Shuxia Di,Lingling Guo,Xiaoliang Xu,Jia Zhao,Feng Feng,Qunfeng Zhang,Xiaonian Li
Designing the electron-rich palladium active site is of great importance to enhance the selectivity of ethylene in acetylene semi-hydrogenation. In this work, ionic liquids, the effective electronic modifier, were mingled with palladium solution to be immobilized on Al 2 O 3 by incipient impregnation method. X-ray photoelectron spectra characterization was conducted to characterize the structure of catalysts, suggesting that some ionic liquids can form unique carbene structure. The catalytic results showed that those immobilized ionic liquids that can form unique carbene structure exhibited much higher selectivity of ethylene than those cannot. The above results were obtained because carbene can donor the electron to palladium, enriching the electron density of palladium and therefore facilitating the desorption of ethylene. The findings of the unique carbene structure derived from ionic liquids in this work provide an efficient strategy to design the catalyst to improve the selectivity of the intermediate in other partial hydrogenationreactions.
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JOURNAL OF CHROMATOGRAPHY B-ANALYTICAL TECHNOLOGIES IN THE BIOMEDICAL AND LIFE SCIENCES
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2018
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IF 2.441
Xuran Wang,Ming Gao,Jiajia Gao,Xuedong Wang,Meiping Ma,Huili Wang
Herein, we established an ionic liquid (IL)-based liquid-solid transformation microextraction (IL-LTME) combined with HPLC-UV detection for the simultaneous determination of triclosan (TCS) and its methylated product, methyltriclosan (MTCS), in human fluids. The IL-LTME method was based on an in situ metathesis between hydrophilic IL and ion-exchange salt to form a solid hydrophobic IL. According to the above principle, a hydrophilic IL, [C 12 MIM]Br, was selected as the extractant, and NH 4 PF 6 as ion-exchange salt. The prominent advantages of the newly developed method are: (1) the in-situ reaction between the extractant [C 12 MIM]Br and ion-exchange salt NH 4 PF 6 changed the IL from hydrophilic to hydrophobic that avoiding the stick of ionic liquid on the tube wall; (2) bubbling with NH 3 greatly increased the contact area between IL-extractant and analytes resulting in improved extraction recovery; and (3) solidification of the [C 12 MIM] PF 6 provided a good separation and avoided the use of specialized equipment. A series of main parameters were optimized by single-factor screening and central composite design as follows: 0.9 mL of NaOH, 2.0 min of second ultrasonically time, 10 min of centrifugation time, 21 mg of extractant [C 12 MIM]PF 6 , 2.4 min of ultrasonic time, 65 mg of NH 4 PF 6 and 13.8 min of cooling time. Under the optimized conditions, the limits of detection for TCS and MTCS were 0.126–0.161 μg L −1 in plasma samples, and 0.211–0.254 μg L −1 in urine samples, respectively. The extraction recoveries for TCS and MTCS were in the range of 94.1–103.8%. The intra-day and inter-day precisions were 1.00–4.74% and 1.02–5.21%, respectively. In general, the IL-LTME method is environment-friendly, time-saving, economical, high efficient and robust with low detection limits and high recoveries. Thus, the newly developed method has excellent prospects for sample pretreatment and analysis of trace TCS and MTCS in blood and urine samples.
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AICHE JOURNAL
·
2018
·Vol. 64
·期 11
·4080-4088
·
IF 3.326
Qi Ding,Xing Cui,Guo-Hua Xu,Chao-Hong He,Ke-Jun Wu
Amlodipine is a widely used medication in treating hypertension, which is also known as a chiral compound. So far efforts have been made to obtain optically pure ( S )-amlodipine because ( R )-amlodipine has poor efficacy and is related to undesirable side effects. However, the available separation methods for amlodipine are still unsatisfactory. Recently, chiral separation has become a promising application of chiral ionic liquids (CILs), because the structural designability enables them adjustable separation efficiency for specific tasks. In this work, a high-efficient CIL-based liquid–liquid extraction system was developed for racemic amlodipine separation with the assistance of quantum chemistry calculations. Enantioselectivity up to 1.35 achieved by the novel system at 298.15 K is significantly higher than other available extraction systems. Moreover, the recycling of CIL can be easily realized by backward extraction of amlodipine, which is important for the industrial application of CILs. © 2018 American Institute of Chemical Engineers AIChE J , 64: 4080–4088, 2018
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CHINESE JOURNAL OF CHEMICAL ENGINEERING
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2018
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IF 1.712
Pengcheng Hu,Wei Jiang,Lijuan Zhong,Shufeng Zhou
The physicochemical properties of three different amide–AlCl 3 based ionic liquid (IL) analogues and their mixtures with copper salt, such as conductivity, viscosity, density and isobutane solubility were determined over a wide range of temperatures. The effects of amide structure, amide/AlCl 3 molar ratio and CuCl modification on these physicochemical properties were investigated. Results showed that the conductivity of amide–AlCl 3 based IL analogues was much lower than that of traditional Et 3 NHCl–AlCl 3 IL with same ligand/AlCl 3 molar ratio due to incomplete splitting of AlCl 3 , whereas the density and viscosity of amide–AlCl 3 based IL analogues were slightly higher. The viscosity of amide–AlCl 3 based IL analogues was closely related to the amide structure, and followed the order of DMA–AlCl 3 > AA–AlCl 3 > NMA–AlCl 3 with same amide/AlCl 3 molar ratio. Meanwhile, the density of amide–AlCl 3 based IL analogues ranked in the following order: AA–AlCl 3 > NMA–AlCl 3 > DMA–AlCl 3 . Increasing the amide/AlCl 3 molar ratio decreased the conductivity and density, while increased the viscosity. The solubility experiment indicated that the isobutane solubility in NMA–AlCl 3 was highest than that in two other IL analogues. Under the modification of CuCl, the conductivity, viscosity and density of these IL analogues increased, whereas the isobutane solubility decreased. These results provide the foundation for the development of a suitable IL analogue catalyst for isobutane alkylation .
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JOURNAL OF CHEMICAL AND ENGINEERING DATA
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2019
·
IF 2.298
Lemeng Wang,Xiangfeng Tian,Chi Fang,Hao Huang,Dong Fu,Yuheng Quan
In this work, the surface tensions (γ) of the aqueous blends of 1-dimethylamino-2-propanol (DMA2P) + amino acid ionic liquids (AAILs) were studied using the Wilhelmy plate method at temperatures from 303.2 to 323.2 K and atmospheric pressure. The AAILs include tetramethylammoniumglycinate ([N1111][Gly]), 1-butyl-3-methylimidazolium glycinate ([Bmim][Gly]), and 1-butyl-3-methylimidazolium-l-lysinate ([Bmim][Lys]). The concentrations of DMA2P and AAILs were varied between 0.300 and 0.500 wt % and 0.025 and 0.075 wt %, respectively. A thermodynamic correlation approach with respect to the mass fraction and temperature was employed to correlate the surface tension of DMA2P–AAILs aqueous solutions. The surface entropy (SS) and surface enthalpy (HS) were calculated from the analytical formulation, and their variation with mass fraction and temperature was demonstrated. The effects of the types of AAILs on the surface properties were also analyzed and compared.
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CHEMICAL ENGINEERING JOURNAL
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2018
·
IF 6.735
Huawei Yang,Liangjiu Bai,Donglei Wei,Lixia Yang,Wenxiang Wang,Hou Chen,Yuzhong Niu,Zhongxin Xue
In this work, poly(ionic liquid)-based porous hybrid materials were facilely prepared through ionic self-assembly method and proposed as adsorbents for removal and separation of ionic dyes. PIL, namely poly-[ N , N -dimethyl-dodecyl-(4-vinylbenzyl)ammonium chloride], was synthesized by simple radical polymerization and directly assembled with the multi-charged anionic cluster of polyoxometalate (POM) to yield PIL/POM hybrid materials without involving any toxic organic solvents and tedious modification processes. The obtained hybrid materials were characterized by various techniques and utilized as adsorbents for removal of a variety of ionic dyes from water. By adjusting the proportion of PIL and POM in the hybrid materials, the adsorption capability and selectivity towards cationic and anionic dyes could be effectively regulated. The preferred adsorbent showed fast adsorption rate and large adsorption capacity, and was able to selectively remove anionic dyes from cationic/anionic mixed dyes aqueous solutions. Furthermore, the used adsorbent can be easily collected and regenerated. All the results demonstrate that the PIL/POM hybrid material is an efficient, durable and sustainable adsorbent in water purification treatment.
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