MOLECULES
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2022
·Vol. 27
·期 16
·5307
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IF 4.927
Wenzhuo Xu,Xinpei Gao,Liqiang Zheng,Fei Lu
In recent years, aqueous two-phase systems (ATPSs) have been widely used in different fields and have become an increasingly attractive subject due to their application in the separation and purification of biomolecules. In this work, the aqueous phase behavior of ionic liquids (ILs) was modulated by changing thecis-transstructure of the anion in ILs. With the same tetra-butyl-phosphine as the cation, the cis-anion exhibited upper critical solution temperature (UCST) phenomena. In contrast, thetrans-anion exhibited lower critical solution temperature (LCST) phenomena. The proposed mechanism shows that the main factors responsible for these phenomena include variations in the dissociation degree with temperature and the steric hindrance of the ILs. This phase behavior combines the chemical equilibrium in a solution with the microstructure of the molecule and is useful for constructing new chemical dynamic equilibria in ATPS. As an example of its application, aqueous solutions of both ILs can be used for the efficient separation and extraction of specific amino acids. The two ATPS systems reported in this work highlight a simple, effective, and environmentally friendly method for separating small biological molecules.Keywords:ionic liquid;aqueous two-phase system;dicarboxylic acid;amino acid isolation
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PubMed
高影响因子
HIGH PERFORMANCE POLYMERS
·
2022
·
IF 1.73
Hongge Jia,Shijun Zhao,Pengfei Jiang,Boyu Jing,Guoxing Yang,Shuangping Xu,Mingyu Zhang,Yanqing Qu,Yonglan Zou
A set of ionic liquid capped polyimide membranes was prepared using 1-aminoethyl-3-methylimidazolium hexafluorophosphate (IL1) and 1-aminopropylimidazolium bis(trifluoromethylsulfonyl)imine (IL2) as the terminal groups. The products’ molecular weights, mechanical properties, and separation permeability (CO2/CH4) were investigated. For CO2/CH4 separation, the selectivity of the ionic liquid capped polyimide membranes was higher than that of noncapped ones. Among them, the membrane synthesized by 4.4′- diaminodiphenyl ether and 4.4′-(hexafluoroisopropyl) diphthalic anhydride (6FDA) as monomer, with IL1 as terminal group, displayed the best selectivity. Its permeability was 7.47 Barrer and selectivity 102.42, which exceeded the 1991 Robeson curve. Polyimide membranes capped by ionic liquid showed high gas selectivity and good gas permeability as well as good physical and chemical properties. Consequently, it can be concluded that introducing an ionic liquid structure to polyimide chains could make attractive membrane materials for various gas separation and related applications.
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INDUSTRIAL CROPS AND PRODUCTS
·
2022
·
IF 6.449
Jun Li,Yongyan Kuang,Yanlan Bi,Shangde Sun,Dan Peng
The effects of N-methyl pyrrolidone hydrogen sulfate ([Hnmp]HSO 4 ), α-pyrrolidone hydrogen sulfate ([Hnhp]HSO 4 ), and dinucleated pyrrolidone hydrogen sulfate ([[Hnhp]HSO 4 ] 2 ) on ring-opening of epoxidized soybean oils (ESO) was comparatively investigated. Results showed that [Hnhp]HSO 4 had stronger catalytic activity than the other two. Under the optimal conditions ([Hnhp]HSO 4 loading of 6%, water-epoxy group ratio of 9:1 (mol/mol), reaction temperature of 45 °C, and reaction time of 4 h), the resulting di-hydroxylated soybean oils (DSO) with an epoxy content of 0.87% and hydroxyl value (OHV) of 213.41 mg KOH/g was achieved, which corresponded to a conversion rate of OHV of 57.98%. In-situ Fourier transform infrared spectroscopy (In-situ FTIR) and FTIR analyses indicated that the rapid ring-opening of ESO and formation of DSO mainly occurred at 2–3.5 h. The increase of polarity and molecular weight after ring-opening and the formation of hydrogen bonds resulted in the higher viscosity of DSO than ESO. ESO and DSO were thermally stable at up to 350 °C. The effectiveness of [Hnhp]HSO 4 in catalyzing the ring-opening of ESO was comparable to that of inorganic acids. Almost complete ring-opening of epoxy groups with much less etherification leads biopolyols to have more available hydroxyl groups. Thus, the resulting biopolyols can be processed as chemical intermediates under more flexible parameter conditions.
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高影响因子
ADVANCED FUNCTIONAL MATERIALS
·
2022
·Vol. 32
·期 32
·2203641
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IF 19.924
Yunfei Li,Xi Fan,Cai Shen,Xixiu Shi,Pengcheng Li,Kwun Nam Hui,Junpeng Fan,Kai Kang,Ting Zhang,Lei Qian
Colloidal quantum dot light-emitting diodes (QLEDs) simultaneously exhibiting high external quantum efficiency (EQE) and operation stability are achieved via a simple solution processing. A silver bis(trifluoromethane-sulfonyl)imide treatment that is used to chemically dope the poly(3,4-ethylenedioxythiophene):poly(4-styrenesulfonate) (PEDOT:PSS) hole injection layer (HIL) is proposed. The ionic liquid salt acts as an effective p -dopant for high charge concentrations; and it raises the work functions and surface potentials of the PEDOT:PSS HIL for an interface energy band alignment. Benefiting from a raised hole mobility and a better charge mobility balance, the processing-simple colloidal red QLEDs yielded the highest EQE of up to 17.4%. In particular, a very broad plateau of EQE values over 16.5% in the brightness of 400–10 000 cd m −2 is obtained. Moreover, the packaged QLEDs exhibit an excellent operation stability in ambient air. The T 95 (time for the device brightness to decrease to 95% of its initial brightness) at an initial brightness of 1000 cd m −2 is 4160 h. The work highlights a promising ionic liquid strategy to guide the development of high-performance and cost-effective QLEDs.
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高影响因子
JOURNAL OF CHEMICAL SCIENCES
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2022
·Vol. 134
·期 2
·1-9
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IF 2.15
Hu Lihua,Chen Chen,Wang Xiao,Hu Kairan,Xu Zhihao,Xu Wei
A high-efficiency adsorbent ZIF-8 was successfully prepared in a microemulsion system provided by an ionic liquid, which showed excellent potential for removing phosphate from water. The properties of the adsorbents were determined by several characterization methods, such as X-ray diffraction (XRD), infrared spectroscopy (FTIR) and Brunauere-Emmette-Teller (BET) et al. The results confirmed that ZIF-8 prepared in the ionic liquid microemulsion (ZIF-8-ILM) has a smaller particle size compared with that prepared in an aqueous solution. Moreover, the ZIF-8-ILM holds a high BET specific surface area and pore volume, as well as the textural meso- and macro-porosities formed by inter-particle voids. Based on these traits, the ZIF-8-ILM exhibit excellent adsorption capacity for phosphate, as evidenced by a maximum adsorption capacity of 178.99 mg/g was obtained. In addition, the capture of phosphate on ZIF-8-ILM was quite quickly and reached equilibrium within 60 min. Graphical abstract A high-efficiency adsorbent ZIF-8 was successfully prepared in a microemulsion system provided by an ionic liquid. The ZIF-8 materials prepared not only had high BET specific surface area and pore volume but also exhibited hierarchical pore structure, which showed excellent potential for removing phosphate from water.
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NEW JOURNAL OF CHEMISTRY
·
2022
·Vol. 46
·期 21
·10379-10385
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IF 3.925
Xiujing Lin,Xinshuang Liu,Shiyuan Xu,Zeyu Liu,Cuie Zhao,Ruiqing Liu,Pan Li,Xiaomiao Feng,Yanwen Ma
Solid polymer electrolytes (SPEs) for lithium metal batteries (LMBs) exhibit predominant safety over traditional carbonate-based organic liquid electrolytes. However, the low ionic conductivity of SPEs related to crystallinity at room temperature still hinders their practical application. The incorporation of nonflammable and ion-conductive ionic liquids (ILs) as plasticizer agents plays an active role in suppressing crystallinity. Herein, the relationship between the cations for ILs and the cycling performance of Li/LiFePO4 batteries were investigated. EMIM+ demonstrates the best ability for reversible Li+ intercalation/deintercalation behavior over other cations due to its superior cationic solvation, highest ion conductivity and lowest viscosity. The Li/LiFePO4 batteries based on the optimized EMIM+-encapsuled ionogel electrolyte could operate steadily over 120 cycles at 0.5C and room temperature. The results illustrate that the IL-plasticized hybrid electrolyte is a promising electrolyte candidate for room temperature solid state LMBs with high energy densities.
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高影响因子
CHEMICAL PHYSICS LETTERS
·
2022
·
IF 2.719
Hao Zhu,Yanping Mo,Chao Wang,Jing Li,Congcong Tian,Yongtao Wen,Zhipeng Lin,Guomu Yu,Luqi Wang,Peiran Hou,Xiao-Li Zhang,Wei Li,Yi-Bing Cheng,Fuzhi Huang
Regarded as one of the best hole transporting material (HTM) for perovskite solar cells, 2,2′,7,7′-tetrakis-(N,N-di-4-methoxyphenylamino)-9,9′-spirobifluorene (spiro-OMeTAD) has suffered from instability induced by Lithium bis(trifluoromethanesulfonyl)imide (Li-TFSI) hygroscopicity and aggregation. Herein, we replace Li-TFSI with the hydrophobic ionic liquid (IL) 1-Butyl-1-methylpiperidinium bis(trifluoromethyl sulfonyl)imide (BMPIP-TFSI). The BMPIP-TFSI functions as a p -type dopant in the spiro-OMeTAD, increasing the hole mobility, promoting the conductivity and enhancing the moisture-resistance of HTM. The corresponding perovskite solar cells achieve a champion power conversion efficiency exceeding 23%. Furthermore, the un-encapsulated devices show enhanced stability under humid environment, retaining 85% of its initial efficiency after 500 h.
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高影响因子
MICROCHEMICAL JOURNAL
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2022
·
IF 5.304
Kaijia Xu,Qingzhou Dai,Yuzhi Wang,Kai Chen,Yinyin Qian
A novel ionic liquid-crosslinked molecularly imprinted polymer with magnetic responsivity (IL-Fe 3 O 4 @AAm-MIP) is fabricated for the efficient and selective adsorption of lysozyme (Lys) via surface imprinting method by using Fe 3 O 4 nanoparticles as carrier, acrylamide (AAm) as functional monomer, 1-(α-allyl acetate)-3-vinyl imidazole chloride ionic liquid as cross-linker and Lys as template molecule. The structures, morphologies and adsorption behaviors of IL-Fe 3 O 4 @AAm-MIP are investigated in detail. Compared with the non-imprinted polymer, the experimental results turn out that IL-Fe 3 O 4 @AAm-MIP exhibits a higher adsorption capacity of 334.1 mg/g with an imprinting factor ( IF ) of 2.94 owing to the imprinting effect. Simultaneously, the selective adsorption experiments are carried out and the IF obtained for the reference proteins, including bovine hemoglobin, bovine serum albumin, cytochrome C and ovalbumin, were 1.74, 0.19, 2.49 and 0.87, respectively, demonstrating the favorable selectivity of the IL-Fe 3 O 4 @AAm-MIP towards Lys. Besides, the IL-Fe 3 O 4 @AAm-MIP is proved to be able to specifically capture Lys from binary protein mixtures as well as actual biological sample. The obtained results revel that the developed IL-Fe 3 O 4 @AAm-MIP with rapid magnetic separation, high affinity and favorable selectivity is a promising material in the enrichment of biomacromolecules.
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高影响因子
FUEL
·
2022
·
IF 8.035
Ping Lu,Huaifang Li,Mantian Li,Jie Chen,Changshen Ye,Hongxing Wang,Ting Qiu
In this work, acidic ionic liquid (AIL) was grafted into NH 2 -UiO-66 through acid-base interaction. And the novel heterogeneous catalyst x AIL@NH 2 -UiO-66 ( x means the mass ratio of AIL to NH 2 -UiO-66) was first applied in the field of biodiesel production. The optimal catalyst 3AIL@NH 2 -UiO-66 with good wettability (with reactants) and high acidity was prepared successfully. Accordingly, the 3AIL@NH 2 -UiO-66 can be widely applied in biodiesel production from different raw materials. The conversion of free fatty acids (FFAs) in esterification was above 90%, as well as the biodiesel yield in transesterification was above 80%, showing excellent catalytic activities of 3AIL@NH 2 -UiO-66. And the 3AIL@NH 2 -UiO-66 also revealed excellent reusability, with the conversion of oleic acid decreases from 96.86% to 90.42% after 6 runs. In addition, the interaction between any two of the three factors (catalyst dosage, reaction time and molar ratio) on the oleic acid conversion was revealed with 3D response surface technology. By the mechanism investigation, the good wettability with reactants and high acidity of the catalysts are identified as key factors for biodiesel production. The method of anchoring ionic liquids with organic linkers for the application of MOFs in biodiesel production offers abundant possibilities.
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RSC Advances
·
2022
·Vol. 12
·期 23
·14477-14484
·
IF 4.036
Dong Fu,Xiaoru Gao,Jue Wang,Haijian Jiang,Mingming Zheng,Peng Li,Bo Huang,Kan Kan,Xiaochen Zhang
A novel series of picoline-based ionic liquid surfactants, N-alkyoxycarbonyl-3-picoline bromides [CnEmpy][Br] (n = 10, 12, 14), have been synthesized. The thermal stability, aggregation behavior and surface activity of the synthetic ionic liquid surfactants were investigated systematically though a series of methods, such as thermogravimetric analysis (TGA), differential scanning calorimetry (DSC), tensiometry and conductivity. The thermodynamics of micellization of the ionic liquid surfactants solution were studied by using the conductivity method in the temperature range 278.15–318.15 K. The surface activity parameters and thermodynamics parameters were derived, respectively. The enthalpy–entropy compensation effect was further discussed by using relative thermodynamics parameters. It was found that the [CnEmpy][Br] have moderate surface activity, and their critical micelle concentration (CMC) decreased with the ester-functionalized chain length and exhibited a U-shape with temperature. The calculation results of the thermodynamic parameters showed that the micellization processes of [CnEmpy][Br] were spontaneous, endothermic at low temperature and exothermic at higher temperature.
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高影响因子
CHEMICAL ENGINEERING JOURNAL
·
2022
·
IF 16.744
Meng Zhao,Yujie Ban,Weishen Yang
Ionic liquid molecule layers (ILMLs) were assembled on MOF-808 with high porosity for gas adsorption. ILMLs, as a result of better affinity to CO 2 , perform like an adhesive layer to trap CO 2 and MOF-808 performs as a gas reservoir. Deliberately controlling the thickness of ILMLs from 1.7 to 18 nm, we strike a balance of capacity, selectivity and cycling performances for CO 2 capture. The optimal composite adsorbs substantial amount of CO 2 at ambient conditions (3.00 mmol g −1 ), which is 2.6 times of that on MOF-808 (1.15 mmol g −1 ). CO 2 /N 2 selectivity towards mimic combustion flue gas in industry, was 372 (towards 15 mol.% of CO 2 in N 2 ) and 478 (towards 5 mol.% of CO 2 in N 2 ), near one-order magnitude higher than MOF-808 and exceeding most benchmark materials. Notably, by overcoming the gas–liquid interface limitation, CO 2 capacity on each gram of ILMLs was 1000 times higher than that of the bulk liquid. The composite presents cycling separation performances with great energy efficiency for mimic flus gas, as a complete regeneration can be freely achieved at ambient temperature.
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高影响因子
CHINESE JOURNAL OF CHEMICAL ENGINEERING
·
2022
·
IF 3.898
Xuan Gao,Zhihui Li,Dongsheng Zhang,Xinqiang Zhao,Yanji Wang
Absract 2,5-Dicyanofuran (DCF) is an important biomass-derived platform compound primarily used to prepare bio-based adiponitrile, which is the key precursor for the synthesis of nylon 66 and 1,6-hexanediisocyanate (HDI). In this study, one-pot, green and safe synthesis of DCF from 2,5-diformylfuran (DFF) and hydroxylamine ionic liquid salts was proposed. Eco-friendly hydroxylamine ionic liquid salts were used as the nitrogen source. Ionic liquid exhibited three-fold function of co-solvent, catalysis and phase separation. The conversion of DFF and yield of DCF reached 100% under the following optimum reaction conditions: temperature of 120 °C for 70 min, volume ratio of paraxylene: [HSO 3 -b-Py]·HSO 4 of 2:1, and molar ratio of DFF:(NH 2 OH) 2 ·[HSO 3 -b-Py]·HSO 4 of 1:1.5. The reaction mechanism for the synthesis of DCF was proposed, and the kinetic model was established. The reaction order with respect to DFF and intermediate product 2,5-diformylfuran dioxime (DFFD) was 1.06 and 0.16, and the reaction activation energy was 64.07 kJ·mol −1 and 59.37 kJ·mol −1 respectively. After the reaction, the ionic liquid was easy to separate, recover and recycle.
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