JOURNAL OF MOLECULAR LIQUIDS
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2021
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IF 6.165
Helin Xu,Xueqin Li,Yanyan Hao,Xiaobin Zhao,Yun Cheng,Jinli Zhang
To achieve simple and efficient separation of acteoside (ACT), extraction ACT from crude extracts of Cistanche tubulosa via ionic liquid (IL) based aqueous two-phase system (ATPS) is investigated. The IL–ATPS comprising [C 4 mim]BF 4 and (NH 4 ) 2 SO 4 exhibits excellent extraction performance, extracting almost all ACT in the [C 4 mim]BF 4 -rich phase. The high polarity of [C 4 mim]BF 4 having multi-hydrogen bond receptors is conducive for extracting ACT in the IL-rich phase, and (NH 4 ) 2 SO 4 not only provides a weak acidic microenvironment for increasing ACT stability in the IL-rich phase but also reduces the solubility of ACT in the salt-rich phase via the salting-out effect. In addition, molecular simulation results show that ACT is extracted in the [C 4 mim]BF 4 -rich phase via multi-interactions, including hydrogen bonding, van der Waals forces, and π–π stacking. This study is expected to provide a valuable reference for the separation of bioactive constituents from natural products.
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CANADIAN JOURNAL OF CHEMICAL ENGINEERING
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2020
·
IF 1.687
Ibrahim A. Alhumaydhi,Rashid Abro,Shaukat Ali Mazari,Masroor Abro,Sabzoi Nizamuddin,Abdul Q. Memon,Guangren Yu
This work presented the preparation of two new systems comprised of ionic liquids (ILs), organic solvent, and cuprous salt. Consequently, their absorption ability was investigated for propylene (C 3 H 6 ) and propane (C 3 H 8 ) and their mixtures at 100 kPa-700 kPa pressure and 298 K-318 K temperature. Representative ILs were 1-butyl-3-methylimidazolium thiocyanate ([C 4 mim]SCN) and 1-ethyl-3-methylimidazolium thiocyanate ([C 2 mim]SCN). N,N-dimethylformamide (DMF) and cuprous thiocyanate (CuSCN) were selected for the absorption system. The effects of operating parameters like Cu + concentration, pressure, temperature, and recycling of ILs absorbency were examined and compared with the literature. It was observed that C 3 H 6 shows a chemical absorption while C 3 H 8 undergoes a physical one by [C 4 mim]SCN-DMF-CuSCN and [C 2 mim]SCN-DMF-CuSCN, and an increase in concentration of Cu + effectively improves the absorption capability for C 3 H 6 and the selectivity of C 3 H 6 /C 3 H 8 . Furthermore, [C 4 mim]SCN-DMF-CuSCN had higher absorption capability and selectivity for C 3 H 6 than [C 2 mim]SCN-DMF-CuSCN. [C 4 mim]SCN-CuSCN-2.0 M absorbed 0.637 mol of C 3 H 6 per litre while 0.16 mol of C 3 H 8 per litre at 700 kPa and 298 K, with a selectivity of 3.9. This work shows that new combination of organic solvent and ILs with Cu + salt is a new class of potential reactive absorbents to separate C 3 H 6 and C 3 H 8 .
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JOURNAL OF ALLOYS AND COMPOUNDS
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2020
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IF 4.65
Jianfeng Zhu,Dan Wang,Daming Chen,Baorui Song,Yanhuai Li,Fei Liu,Jian Chen
Mixed transition metal oxides with low-cost elements such as ZnFe 2 O 4 have been considered as the promising candidate as anode materials for Li-ion batteries (LIBs) owing to the high capacity originated from versatile redox reactions . However, poor conductivity and huge volume expansion during charging/discharging cause drastic capacity decay, which hinders their commercial application. Herein, we designed a unique core-shell N doped ZnFe 2 O 4 embedded in B, N doped graphene network (B/N-ZFO@rGO) using ionic liquids as multi-heteroatom source through facile hydrothermal reaction . Benefiting from the enhanced conductivity and structural stability, the B/N-ZFO@rGO as anode material for LIBs not only shows significantly improved specific capacity (668.1 mAh g −1 at 1 A g −1 after 100 cycles), but also remarkable rate capacity and long cycle life (377.4 mAh g −1 at 5 A g −1 after 1200 cycles), demonstrating great potential in future applications. Moreover, such rational design of structure as well as multiple elements doping using ionic liquids can be extensively applied in other electrode materials.
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Polymers
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2020
·Vol. 12
·期 10
·2171
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IF 3.426
Yingjie Luo,Xiaoxia Huang,Shun Yao,Lincai Peng,Fulin Li,Hang Song
A series of imidazolium ionic liquid monomers with L-Proline anions (ViImCn-L-Pro and (ViIm)2Cn(L-Pro)2) were firstly synthesized, after which new copolymer materials were prepared by polymerization of the ionic liquid monomers with N,N′-methylene diacrylamide (MBA). Polymerization conditions, including the ratio of Ils(ViImCn-L-Pro or (ViIm)2Cn(L-Pro)2) and MBA, solvent, ionic liquids and initiator’s amount, were investigated and found to have an important effect on the adsorption capacity. Polymerization conditions were shown to have more significant impacts on adsorption capacities in the following order: the ratio of Ils and MBA > the amount of initiator > ionic liquids > solvent. The polymers were characterized by IR, EA, SEM, particle size distribution and TG. One of the polymers exhibited the highest selective adsorption capacity of tea polyphenols (521 mg/g). which was significantly higher than other adsorption media. The absorbed tea polyphenols could be desorbed readily with 2% hydrochloric acid methanol solution as eluent. The polymer material could maintain a higher adsorption capacity after four reuses. Based on this polymer, a new method for the efficient separation of tea polyphenols from tea water could be developed.Keywords:ionic liquid polymer;imidazole;amino acid;adsorption;tea polyphenols
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高影响因子
BIOMASS & BIOENERGY
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2020
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IF 3.551
Wei Yang,Huan Fan,Min Zhou,Zheng Zhou,Lishi Yan,Xin Ju,Liangzhi Li
Stable cellulases are critical for in situ hydrolysis of ionic liquid-pretreated lignocellulose , and surfactants were reported to improve the stability of cellulase in practical circumstances. In this study, synergistic effect of Tween-80 and [Emim]OAc was first identified to enhance the hydrolysis of lignocellulose by Paenibacillus sp. LLZ1 cellulase, proving the effectiveness of surfactants in in situ hydrolysis. Protein fluorescence and near-UV circular dichroism spectroscopy analyses illustrated that ionic liquids might move local residues and alter global tertiary structure of cellulase, leading to higher instability. The addition of Tween-80 might turn the microenvironment of cellulase residues more hydrophilic and reduce the contact of protein with deactivation factors. The synergistic system was further applied in the in situ hydrolysis of microcrystalline cellulose and bagasse cellulose by Paenibacillus cellulase. The enzymatic hydrolysis rate of microcrystalline cellulose was enhanced by 2.5-fold and the final conversion was improved by 45%. Scanning electron microscopy demonstrated the substrate solubilizing effect during reaction by monitoring the morphological changes of lignocellulosic substrates . This study highlighted the potential of applying synergistic reaction system in in situ enzymatic hydrolysis of lignocellulose, and revealed the inherent mechanism initially.
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CHEMICAL ENGINEERING JOURNAL
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2020
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IF 10.652
Chao Zhou,Chengju Sheng,Lingling Gao,Jia Guo,Peng Li,Bo Liu
The development of treatment of wound healing cannot meet clinical requirements owing to the complex bacteria-infection and inflammatory reaction. It is necessary to develop wound dressings that are fast antibacterial property, anti-inflammation and promoting cell migration and proliferation for shortening wound healing period. In this work, we first synthesized two poly(ionic liquids) (PILs): poly(1-ethyl-3-vinylimidazolium furan-2-carboxylate) (PEIF) and poly(1-butyl-3-vinylimidazolium furan-2-carboxylate) (PBIF). The PILs were then mixed with 5 wt% montmorillonite (MMT) clay and 2-furfurylamine-modified hyaluronic acid (HAF), and chemically crosslinked with four-arm maleimide-polyethylene glycol (Mal 4 PEG) to form degradable semi-inter penetrate network (semi-IPN) hydrogels. In vitro assays demonstrated that the synthesized semi-IPN hydrogels exhibited high antibacterial activities against Escherichia coli and Staphylococcus aureus due to the high antibacterial activity of PILs. Furthermore, the semi-IPN hydrogel could be quickly degraded, and the PILs exhibited high anti-inflammatory activities when they were released from degraded hydrogels. The degradation solutions of hydrogels contained glycosaminoglycan, which was beneficial to cell proliferation and migration. The in vivo anti-infection results further demonstrated that the semi-IPN hydrogels could kill S. aureus and accelerate the healing of infected wounds.
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ACS Sustainable Chemistry & Engineering
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2020
·
IF 7.632
Jiale Yang,Zhiyuan Zhou,You Liang,Jingyue Tang,Yunhao Gao,Junfan Niu,Hongqiang Dong,Rong Tang,Gang Tang,Yongsong Cao
A microcapsule is an ideal choice to realize effective utilization of a pesticide and reduce environmental pollution. A novel preparation method of a microcapsule was developed by complex coacervation of phosphonium ionic liquid (PIL) with gelatin. PIL was newly synthesized and used to dissolve and disperse avermectin (Ave) to form stabilized core–shell structure microcapsules by cross-linking with gelatin in a solution. The results demonstrated that avermectin–phosphonium ionic liquid–gelatin (Ave–PIL–Gel) microcapsules had a high Ave entrapment efficiency (approximately 98% w/w), and could effectively enhance the stability of Ave by reducing its degradation in the environment. The Ave release of synthesized Ave–PIL–Gel microcapsules was governed predominantly by non-Fickian diffusion, and the release rates showed positive correlation with the temperature and the base conditions. Compared with the Ave technical solution, the Ave–PIL–Gel microcapsules had better nematicidal activities against plant-parasitic nematodes and showed great potential for sustainable crop protection. The present study provides an improved controlled release formulation comprising a pesticide, which is sensitive to light and easily degradable in soil encapsulated in negatively charged protein, and also provides an environmentally friendly method for preparing the improved pesticide formulation so that the pesticide release rate and release period can be adjustable.
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JOURNAL OF CHROMATOGRAPHY A
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2020
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IF 4.049
Jingqiu Zhou,Xiujun Ren,Qiurong Luo,Die Gao,Qifeng Fu,Di Zhou,Fengjiao Zu,Zhining Xia,Lujun Wang
A novel reversed-phase/hydrophilic interaction/ion-exchange (RPLC/HILIC/IEC) and chiral recognition mixed-mode stationary phase material was synthesized using 3-n-octadecyl-1-vinylimidazolium bromide and 6-(1-allylimidazolium)-cyclodextrin tosylate as functional monomers. After identifications of intermediates and stationary phase materials using nuclear magnetic resonance analysis, Fourier transform infrared spectrometer, element analysis and thermogravimetric analysis, the synthesized Sil-VMBD material was packed into an empty column under high pressure. The mixed-mode retention performance was researched by hydrophobic, hydrophilic and ionic compounds. And the retention mechanism of the multi-mode stationary phase was studied via changing the mobile phase composition and pH value. Moreover, the enantiomers of 1-phenyl-1-propanol, warfarin and styrene oxide were separated rapidly under reverse-phase mode. Fast enantioseparation of ibuprofen and ketoprofen were obtained within 4 min under polar organic mode. The experimental results show that the as-prepared mixed-mode column possesses reversed-phase, hydrophilic and ion-exchange interactions with various analytes, and these interactions also enable the stationary phase with multi-mode and chiral separation abilities.
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JOURNAL OF MOLECULAR LIQUIDS
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2020
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IF 5.065
Qi Zhang,Siru Ren,Chenming Gu,Ang Li,Song Xue
This work presents, for the first time, a systematic and step-by-step methodology on how to improve the enantioseparation performance of tartaric acid (TT) in capillary electrophoresis (CE) using ionic liquid (IL) technology. A series of chiral and achiral ILs were applied in different separation modes to evaluate their influence on TT's enantioselectivity . Unlike previous ILs-related chiral CE studies, which typically report positive synergistic effect, in this work, negative synergistic effect was observed between TT and most chiral ILs (including several amino acids ILs and a saccharide-based IL). Instead, achiral ILs (the precursors of chiral ILs, mainly tetraalkylammonium hydroxides) exhibited significantly better performance in system modifications when used in combination with TT. The influence of the configuration of TT and chiral ILs on enantioseparation was investigated to explore the synergistic mechanism. The result showed that the existence of the chiral part of the ILs may cause interference rather than facilitation in the selector-selectand interactions. On the basis of the above results, we further designed a novel TT-based IL-type chiral selector, di-tetramethylammonium-D-tartrate ((TMA) 2 -D-TT). It is able to achieve excellent enantioseparation of all model analytes without adding any other chiral or achiral additives. This study demonstrates that TTs, which have almost been abandoned in chiral CE, are still able to provide satisfactory enantioselectivities with the help of ILs. In some application modes, e.g., under the achiral ILs modification or using TT-based ILs, their chiral separation performance is comparable or even superior to the well-established and widely used TT ester-type chiral selectors
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JOURNAL OF POWER SOURCES
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2020
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IF 8.247
Rui Wu,Xianqiang Liu,Yijing Zheng,Yonghe Li,Huifeng Shi,Xiaopeng Cheng,Wilhelm Pfleging,Yuefei Zhang
Due to the excellent theoretical capacity, silicon-based electrodes have been extensively studied to develop high energy-density lithium-ion batteries (LIBs). Nevertheless, the large volume expansion and unfavorable interface seriously hamper its application, and the underlying physics behind are still unclear. In this work, using in-situ environment scanning electron microscopy (ESEM), the morphological evolution of composite silicon-graphite electrodes with different ionic liquids as electrolytes are compared in the range of 20 °C–60 °C. Surprisingly, combining the microstructure and surface reaction products from transmission electron microscope (TEM) and X-ray photoelectron spectroscopy (XPS), it finds out that the fully reaction of lithium-silicon does not generate huge volume expansion, while the side reaction between graphite and electrolyte decomposition products causes dramatic volume expansion and hinders the further lithiation of silicon . On the other hand, the electrolyte which is capable of rapidly releasing F − to form LiF-rich solid electrolyte interphase (SEI) is favorable to maintain the structure integrity and cycling performance. This work casts new understanding from the perspective of intrinsic reaction between electrode and ionic liquid electrolyte, which suggests that the practical application of silicon-based electrodes with appropriate electrolyte is a promising route for high energy-density LIBs.
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JOURNAL OF POWER SOURCES
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2020
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IF 8.247
Xinan Shi,Lijian Huang,Daocheng Pan
In this research, a facile and environmentally friendly solution approach is developed to deposit Cu 2 ZnSn(S,Se) 4 thin films by addition of n -butylammonium butyrate ionic liquid . n -Butylammonium butyrate plays a critical role in solution deposition of Cu 2 ZnSnS 4 precursor thin film. We find that liquid n -butylammonium butyrate can dissolve a number of metal oxides , including Cu 2 O, ZnO, and SnO as well as various metal chlorides , metal nitrates and metal acetates. Smell-free Cu 2 ZnSnS 4 precursor solution is synthesized by dissolving Cu 2 O, ZnO, SnCl 2 and thiourea in an ethanol solution of n -butylammonium butyrate. Thermally degradable n -butylammonium butyrate can be completely removed by a low-temperature sintering process , forming high quality Cu 2 ZnSnS 4 nanoparticle thin film. A power conversion efficiency of 8.79% is obtained by this facile and green solution approach.
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AICHE JOURNAL
·
2020
·Vol. 66
·期 8
·e16253
·
IF 3.519
Yongkang Cao,Xiangping Zhang,Shaojuan Zeng,Yanrong Liu,Haifeng Dong,Chun Deng
The emerging of ionic liquids (ILs) provides an efficient and sustainable way to separate and recover NH 3 due to their unique properties. However, the solid or highly viscous ILs are not suitable for traditional scrubbing. Therefore, an effective strategy was proposed by combining the protic ILs (PILs) with acidic H and low viscous ethylene glycol (EG) to form IL-based deep eutectic solvents (DESs) for NH 3 absorption. The results indicated that these PIL-based DESs not only have fast absorption rate, but also exhibit exceptional NH 3 capacity and excellent recyclability. The highest mass capacity of 211 mg NH 3 /g DES was achieved by [Im][NO 3 ]/EG with molar ratio of 1:3, and was higher than all the reported ILs and IL-based DESs, which was originated from multiple hydrogen bonding between acidic H and hydroxyl groups of the DESs and NH 3 . This work will provide useful idea for designing IL-based solvents for NH 3 separation applications.
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