Journal of Cleaner Production
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2021
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IF 9.297
Xiaocheng Lin,Mantian Li,Zhiwen Chen,Meichen Li,Youjie Huang,Ting Qiu
Polymeric self-solidifying ionic liquids (PSILs) were simply fabricated by the facile nucleophilic substitution reaction between polyethyleneimine (PEI) and 1,3-propanesultone (PS). Because of the presence of less-substituted amino groups in PEI chain, more than 1 equivalents of sulfonic groups (–SO 3 H) per amino group were grafted onto PEI chain. Part of –SO 3 H groups could be bonded with amino groups to form –SO 3 – …N + – zwitterions , the presence of zwitterion and the high molecular of PEI could make PSILs become solid, while the left free –SO 3 H groups played a role in the acid catalysis and therefore no additional acids were required. The final PSILs showed high catalytic activity , stability and generality as the heterogeneous catalysts for biodiesel production via the esterification of a variety of free fatty acids (FFAs), as well as the transesterification of waste cooking oil and palm oil. Moreover, the one-step fabrication process of PSILs is much simpler than the multi-step fabrication process of traditional ionic liquids, suggesting potential benefits.
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Green Energy & Environment
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2020
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IF 6.395
Chenhao Jiang,Hongye Cheng,Zexian Qin,Ruizhuan Wang,Lifang Chen,Chen Yang,Zhiwen Qi,Xiucai Liu
1,5-Pentanediamine (PDA) produced by biological fermentation becomes popular, but the separation of PDA from the broth is a typical difficult problem. In this work, the performance of 200 ionic liquids (ILs), formed by combining 25 cations and 8 anions, in the extraction of PDA from aqueous solution were evaluated using COSMO-RS model. The extraction mechanism was investigated with the help of σ-profile and interaction energy analyses. Both the cation and anion have impacts on the extraction efficiency, where cation mainly influences the interaction of IL with PDA and anion affects the hydrophobicity of IL. The IL composed of long alkyl-chain in cation and the anion of [PF 6 ] - or [TF 2 N] - , which has the σ-profile more likely distributed in the nonpolar region but less distributed in the polar region, is favorable for extraction. The experimental liquid–liquid equilibrium demonstrated the effects of cation and anion on extraction performance, which validated the reliability of COSMO-RS model in IL screening for PDA extraction. The IL [IM-1,8][PF 6 ] could serve as a promising extractant for the downstream separation process of the biological production of PDA.
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JOURNAL OF MOLECULAR LIQUIDS
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2020
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IF 5.065
Yang He,Lihua Zhou,Shaohua Gou,Jie Yu,Qinqin Gao,Siying Pu,Qin Zhang,Yuanpeng Wu
The hydration and swelling of clay minerals in the reservoir will probably bring about serious damage to stratum. Herein, a series of imidazolium ionic liquids (ILs) with different alkyl chains were synthesized to inhibit the swelling of montmorillonite (MMT). The relationship between the inhibitory property and ILs structure was determined through detailed studies. The combination of adsorption capacity, XPS and zeta potential demonstrated that ILs successfully adsorbed on MMT replacing Na + ion. The adsorption behavior of ILs correlated well with Langmuir adsorption isotherm , implying the homogeneous monolayer adsorption. Besides, the presence of moderate amounts of flexible hydrolyzed polyacrylamide (HPAM) was favorable to improve the inhibition ability of ILs, where HPAM was adsorbed on the surface of MMT through ILs bridging, encapsulating the MMT particles. To understand inhibition mechanism in depth, the interlayer variation of dry and wet MMT and micromorphology of MMT particles were investigated to confirm the intercalation of ILs and stacking variation of MMT particles. Altogether, this study provides new insights into the structure-property relationships of imidazolium ILs and facilitates the design of excellent clay stabilizers.
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SEPARATION AND PURIFICATION TECHNOLOGY
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2020
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IF 5.774
Youan Ji,Yucui Hou,Shuhang Ren,Weize Wu
Indole is an important chemical that can be directly obtained from wash oil mixtures. In this work, several tetraethyl ammonium amino acid (TAAA) ionic liquids (ILs) were designed to separate indole from model wash oil through forming hydrogen bonds. The effects of important factors, such as stirring time, TAAA type, indole concentration, temperature, and TAAA:indole mole ratio, on indole separation were investigated. It is found that these TAAAs can separate indole from model wash oil with separation efficacy up to 98.0% (for tetraethylammonium L-alanine ionic liquid), and the ultimate indole concentration is 1.6 g/dm 3 . This separation process takes less than 5 min. Also, for one kind of TAAA, the ultimate indole concentrations are almost constant despite different initial indole concentrations. The maximum distribution coefficients of indole are 200.9 at the studied conditions. We have also found that water content in TAAA shows a negative effect on indole separation, which inspired us to design a process for TAAA regeneration using water. After regeneration, TAAA can be reused, and the separation efficacy of indole is not significantly reduced. The FT-IR results show that there are hydrogen bonds between TAAAs and indole. Finally, we compared the TAAA method to other methods and demonstrated the advantages.
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ACS Sustainable Chemistry & Engineering
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2020
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IF 7.632
Tian Ma,Zhensheng Shen,Huan Li,An Li,Qian Feng,Yingqiang Sun,Shuguang Deng
Brønsted acid ionic liquids (BAILs) are effective to biodiesel production of in situ transesterification of wet algae due to their dual role as both solvents of cellulose and catalysts of transesterification. The cellulose solubilities of BAILs are depending on H-bonding of BAILs-cellulose in varied solvent conditions, which subsequently affect the biodiesel productions. For this reason, the effects of H-bonding between BAILs including [Bmim][H2PO4], [Bmim]2[HPO4], [Bmim][HSO4], and cellulose under different methanol and water conditions on cellulose extractions are experimentally and theoretically investigated. The cellulose extractions in BAILs are decreasing as [Bmim][H2PO4] > [Bmim]2[HPO4] > [Bmim][HSO4], contrary to the variation of their thermal stabilities and crystallinities caused by varied H-bonding of BAILs-cellulose. Increasing methanol is positive to cellulose extractions in [Bmim][HSO4], while negative to those in [Bmim][H2PO4] and [Bmim]2[HPO4], due to the solvent effect of methanol confirmed by cyclic voltammetry (CV) measurements. The effect of water on H-bonding of BAILs-cellobiose is contrary to the effect of methanol. It is confirmed via the bonding interaction of BAILs-cellobiose through the density functional theory (DFT) computational method. However, the biodiesel yields are varied differently due to the competition of H-bonding of BAILs-cellobiose and deprotonation of BAILs under different methanol and water conditions. This study might pave the way to neutralize the negative effect of water on in situ transesterification via enhancing the cellulose extractions of BAILs.
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Advanced Materials Interfaces
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2020
·Vol. 7
·期 9
·1902194
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IF 4.948
Liwen Mu,Danyang Cao,Wei Zhuang,Qiangliang Yu,Meirong Cai,Yijun Shi
The “block-on-plate” nanocomposite structure material is realized with the zeolitic imidazolate framework (ZIF-67) on graphene oxide (GO) with surface oxygen-rich functional groups. Scanning electron microscopy, X-ray photoelectron spectroscopy, X-ray diffractograms, fourier transform infrared spectroscopy, and ZIF-67/GO demonstrate a high capability of promoting the lubricating performance of [Choline][Proline] ([CH][P]) bio-ionic liquid. Specifically, the wear volume of the disc by [CH][P]-0.1 ZIF-67/GO is only 52% of the one lubricated by pure [CH][P]. Moreover, ZIF-67/GO shows a long time, high dispersion stability in [CH][P]. In addition, the combination of GO nanosheets and ZIF-67 can make ZIF-67/GO have better polishing effect between the steels during the friction process, which can effectively form a robust lubrication layer and improves overall lubricating properties. As a result, the interfacial lubrication can be significantly improved by these newly developed [CH][P]-ZIF-67/GO lubricants. This work offers a new promising application for ZIF-67 nanocomposites with GO in advanced lubrication systems. This work also provides a new strategy of producing lubricants containing nanoparticles with high dispersion stability, which may solve the biggest challenge in this field.
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TALANTA
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2020
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IF 5.339
Xiaofei Ma,Yingxiang Du,Xinqi Zhu,Jiangxia Yang
Recently, chiral ionic liquids have attracted increasing attention in analytical chemistry . However, only a few papers focus on the application of them in visual chiral recognition. Herein, two functionalized chiral ionic liquids derived from (S)-mandelic acid (1-butyl-3-methylimidazolium mandelate , CIL1 and N-butyl-N-methylpyrrolidinium mandelate, CIL2) were prepared for visual chiral recognition of aromatic amino acids for the first time. In the presence of Cu(II) and appropriate solvents, visual enantiomeric responses of phenylalanine , tryptophane, tyrosine and phenylglycine were observed. Relying on solubility or color differences, all chiral recognition could be finished within 5 min. The potential mechanism was investigated by means of infrared spectroscopy, ultraviolet spectroscopy, thermal gravity analysis, elemental analysis and scanning electron microscope. Results revealed that CuSO 4 interacted with CIL1 and D-tryptophane in the ratio of 1:1.96:0.43 in relevant precipitate, and the different stability of complex was responsible for the chiral recognition. In addition, resolution of racemic tryptophane was performed, which offered excellent enantiomeric excess values (94.2% for CIL1 and 95.1% for CIL2 in solid phase). The proposed ionic liquids had strong enantioselectivity for aromatic amino acids and great potential in visual chiral recognition.
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PubMed
高影响因子
MACROMOLECULES
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2021
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IF 5.985
Guangqian Zhu,Liang Wang,Jia Kuang,Guangqiang Xu,Yongqiang Zhang,Qinggang Wang
The highly selective cationic polymerization of isoprene has been a great challenge over the last 70 years. Here, a synergistic Tf2NH-ionic liquid (IL) catalytic system has been developed to address this issue under mild conditions. Tf2NH serves as a highly efficient catalyst for the cationic polymerization with 0.01 mol % loading, and its counteranion IL serves as a remarkable selectivity-controlled medium delivering low-molecular-weight (Mn < 1500 g/mol) polyisoprenes with excellent yields (up to 99%), double bond content (DBs, up to 99%), and trans-1,4 selectivities (>95%). Mechanistic investigations indicated that an IL cation could effectively suppress the reprotonation of double bonds in polymer chains by reducing the electron density, leading to highly linear desired polymers. The industrial application prospects are illustrated by the IL recycling process, which could be used for more than five rounds with excellent yields and DBs.
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JOURNAL OF INDUSTRIAL AND ENGINEERING CHEMISTRY
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2021
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IF 6.064
Wang Yu,Lianglei Liu,Fenfang Li,Zhijian Tan
As a kind of novel polyelectrolyte materials, poly(ionic liquids) (PILs) have excellent potentiality in the separation of ampholytes suchlike amino acids. Herein, the β-cyclodextrin-based PILs had been synthesized, followed by blending with poly(vinylidene fluoride) (PVDF) to prepare poly(ionic liquid) membranes (PILMs). The Fourier transformed infrared (FT-IR) spectroscopy, 1 H nuclear magnetic resonance ( 1 H NMR), scanning electron microscope (SEM), thermal gravimetric analysis (TGA), mechanical strength, zeta potential, and pore size distribution were characterized for these membranes or their intermediates. These PILMs had been developed for the selection separation of the amino acids mixture of L-glutamic acid (L-Glu) and L-threonine (L-Thr). The factors influencing the separation result were investigated, including the solution pH of the amino acids mixture and the PVDF amount in PILMs. The maximum selectivity of 55% can be obtain by one-step separation under the optimal conditions. This separation process using PILMs had the advantages of good selectivity, low operating pressure, larger water flux, and good reusability, which had the potentiality in the separation of various amino acids mixtures.
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Green Energy & Environment
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2019
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IF 0
Pengcheng Hu,Zhitao Wu,Junlin Wang,Yuqing Huang,Quanyou Liu,Shu-Feng Zhou
Four protic ionic liquids (ILs) were synthesized via a one-step method by using benzotriazole (BTA) and benzimidazole as cations, and benzenesulfonic acid and 2-naphthalenesulfonic acid (NSA) as anions. These ILs were used as green corrosion inhibitors for brass specimens in a nitric acid solution. The structure of the protic ILs was characterized by 1 H-NMR, 13 C-NMR, and FT-IR spectroscopy. The effects of the IL structure, IL concentration, acid concentration, and corrosion time on the surface morphology of brass specimens and the inhibition efficiency ( η %) of ILs were investigated by the weight loss method combined with SEM and EDS spectroscopy. Polarization curves and impedance spectroscopy were used to analyze the electrochemical corrosion inhibition mechanism of ILs. Results showed that IL synthesis was a proton transfer process, and the proton of the –SO 3 H group on NSA was deprived by BTA. IL [BTA][NSA], which had a high charge density and large conjugate π band, was the most effective inhibitor for brass corrosion. The η % of [BTA][NSA] decreased with the increase in acid concentration and corrosion time, which showed an increment with the increase in [BTA][NSA] concentration. The higher the η % of [BTA][NSA] is, the smoother the surface of the brass specimens is, and the smaller the undistributed area of Cu element will be. Corrosion inhibiting mechanism from electrochemical analysis indicated that the addition of [BTA][NSA] increased the polarization resistance of the brass electrode significantly and suppressed both anodic and cathodic reactions.
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POLYMER
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2019
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IF 3.771
Junheng Zhang,Shiyuan Chen,Bin Qin,Daohong Zhang,Peng Guo,Qianjun He
The present work is based on a study of methylhexahydrophthalic anhydride (MHHPA) cured diglycidyl ether of bisphenol A (DGEBA) in the presence of a hyperbranched ionic liquid (HBP-Mim). Differential scanning calorimetry studies confirmed that the curing reaction was accelerated by HBP-Mim. The impact strength of DGEBA (17.1 kJ/m 2 ) increased to 39.5 kJ/m 2 after the addition of 9 phr HBP-Mim-2. Tensile and flexural properties also showed a significant improvement as the incorporation of 9 phr HBP-Mim-2 resulted in 63.1% and 135.2% increase in the tensile and flexural strengths of epoxy thermosets , respectively, compared with neat DGEBA. Thermal stability and thermomechanical properties of the HBP-Mim modified epoxy thermosets also showed a significant improvement. The simultaneous improvements in the mechanical and thermal properties could be attributed to increased free volume and cross-link density.
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JOURNAL OF MOLECULAR LIQUIDS
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2019
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IF 4.561
Yi Li,Songwei Zhang,Qi Ding,Baofeng Qin,Litian Hu
Ionic liquids (ILs) are extensively used in many fields owing to their attractive characteristics. Good structure designability provides ILs an opportunity to integrate multiple functions into their structures, which could promote their industrial applications as versatile materials. In this study, three 4, 6-dimethyl-2-mercaptopyrimidine (DMMP) based phosphonium ILs were firstly synthesized. The corrosion inhibition behaviors of these ILs for mild steel in 0.5 M H 2 SO 4 aqueous solutions were investigated by electrochemical tests. Results indicated that all of the three ILs exhibited surprising inhibition efficiencies as high as 99%, even at an ultralow concentration of 0.1 mM. The ILs' adsorption behavior on surface obeys Langmuir isotherm, indicating that the ILs inhibit corrosion of mild steel by monolayer adsorption on the mild steel surface. Moreover, due to the superior adsorption capacity on steel surface, DMMP based ILs are expected have great application potentials as high-performance lubricating materials. As expected, DMMP based ILs showed excellent lubrication performances both at 30 °C and 100 °C as compared to PAO and 1-butyl-3-methylimidazolium tetrafluoroborate (LB104). Surface analyses indicated that tribofilms consist of ILs adsorption layer and tribochemical products, such as FeS, Fe 2 O 3 and organic compounds containing C O bonds, are responsible for the predominant lubrication performances. Therefore, versatile ILs designed in this paper have gathered two significant abilities for industrial applications, which are high corrosion inhibiting properties and excellent lubrication performances. This work is believed to be instructive for designing multifunctional ILs and promoting the ILs' application in industry in the future.
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危险品化学品经营许可证（带存储）