APPLIED SPECTROSCOPY
·
2013
·
IF 1.942
Yunchang Fan,Sheli Zhang,Qiang Wang,Junhai Li,Haotian Fan,Dongkai Shan
The molecular mechanism of the interaction between pepsin and two typical ionic liquids (ILs), 1-butyl-3-methylimidazolium chloride ([C4mim]Cl) and 1-octyl-3-methylimidazolium chloride ([C8mim]Cl), was investigated with fluorescence spectroscopy, ultraviolet absorption, and circular dichroism spectroscopy at a pH value of 1.6. The results suggest that ILs could quench the intrinsic fluorescence of pepsin, probably via a dynamic quenching mechanism. The fluorescence quenching constants were determined by employing the classic Stern-Volmer equation. The constant values are very small, indicating that only a very weak interaction between ILs and pepsin exists. The Gibbs free-energy change, enthalpy change (ΔH), and entropy change (ΔS) during the interaction of pepsin and ILs were estimated. Positive values of ΔH and ΔS indicate that the interaction between ILs and pepsin is mainly driven by hydrophobic interaction. Synchronous and three-dimensional fluorescence spectra demonstrate that the addition of ILs (0–0.20 mol L−1 for each IL) does not bring apparent changes to the microenvironments of tyrosine and tryptophan residues. Activity experiments show that the activity of pepsin is concentration dependent; higher concentrations of ILs (>0.22 mol L−1 for [C8mim]Cl and >0.30 mol L−1 for [C4mim]Cl) cause the remarkable reduction of enzyme activity. The presence of ILs also does not improve the thermal stability of pepsin.
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DOI
PubMed
高影响因子
CATALYSIS LETTERS
·
2017
·Vol. 147
·期 6
·1347-1354
·
IF 2.799
Huang Wei,Tao Duan-Jian,Chen Feng-Feng,Hui Wei,Zhu Jia,Zhou Yan
Abstract A new series of aminopolycarboxylate ionic liquids were designed, synthesized, and applied for efficient and selective synthesis of ditetrahydrofurfuryl carbonate (DTC). Tetraethylammonium nitrilotriacetate ([N 2222 ] 3 [NTA]) was demonstrated to show the best catalytic performance, in which DTC could be obtained at a yield of 80% under optimum conditions. Graphical Abstract
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高影响因子
BIOCHEMICAL ENGINEERING JOURNAL
·
2020
·
IF 3.475
Rongling Yang,Tingting Wu,Ningning Xu,Xiangjie Zhao,Zhaoyu Wang,Hongzhen Luo,Muhammad Bilal,Zekun Nie,Yuye Song
Highly efficient and regioselective synthesis of pharmacologically useful 6′-O-benzoyl-helicid catalyzed by the whole-cell catalysts was successfully performed for the first time. The catalytic performance of Aspergillus oryzae whole cells for helicid benzoylation was significantly enhanced in acetone-ionic liquids (ILs) systems containing anions PF 6 , BF 4, and TF 2 N as compared to pure acetone. The catalytic performances of A. oryzae whole cells not only depend on the anion of ILs, but the cation. In acetone-[BMIM][PF 6 ] (5%, v/v) system, the substrate conversion efficiency reached 99 % at 24 h and initial reaction rate was achieved to be 7.42 mM/h, while 99 % substrate conversion was acquired at 72 h in acetone. Moreover, the A. oryzae whole cells showed excellent 6′-regioselectivity (99 %) and high operational stability in helicid benzoylation maintaining 75.5 % of its original activity after seven repeated reaction cycles in acetone-[BMIM][PF 6 ] (5%, v/v) system. In conclusion, the inclusion of a suitable level of ionic liquids might exhibit a high potential for improving whole-cell biocatalysis for helicid benzoylation in a regioselective and cost-effective manner.
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DOI
高影响因子
CHEMICAL ENGINEERING JOURNAL
·
2025
·
IF 13.2
Haoyu Ma,Jiaozhu Wu,Le Xi,Zixuan Wang,Jie He,Pengjian Gong,Guangxian Li,Chul B. Park
The supercritical CO 2 (scCO 2 ) foaming method shows potential for fabricating porous polyimide (PI) materials with small pore size and high void fraction. However, conventional PI polymers suffer from low gas solubility and a rigid molecular backbone, resulting in poor foaming dynamics and high foaming resistance. In this work, we synthesized a thermally stable PI polymer with a rigid backbone, into which highly compatible ionic liquids (ILs) molecules were incorporated. The introduced ILs acted as molecular lubricants, simultaneously enhancing foaming dynamics and reducing foaming resistance. The resulting ILs/PI foam materials shows small pore size (9–12 μm), hydrophobic property (water contact angle 126.5 o ), flame retard property, low temperature toughness (−196 °C) and high thermal resistance property (406 °C). Moreover, a heterogeneous layered porous PI structure was fabricated by modulating the ILs content across different layers, creating alternating porous and solid regions. Leveraging this platform, CNT@Fe₃O₄ nanofillers, providing both dielectric and magnetic loss, were introduced into the porous layer, while conductive CNT was incorporated into the solid layer. The resulting heterogeneous porous PI nanocomposite materials exhibited ultra-low reflectivity electromagnetic interference (EMI) shielding performance (average A/R coefficient ratio of 67.1).
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DOI
高影响因子
JOURNAL OF MEMBRANE SCIENCE
·
2020
·
IF 7.183
Yun-Peng An,Chang Liu,Jing Yang,Bian-Bian Guo,Zhi-Kang Xu
Ionic liquids (ILs) show a wide range of applications as “green” solvents in the new era and the recovery of water-soluble ILs has become an urgent issue. Herein, for the first time, osmotic distillation is applied to concentrate and recover water-soluble ILs with a series of hydrophobic membranes. Poly(vinylidene fluoride) membrane with vertically oriented pores and stainless steel mesh were hydrophobically modified and then compared with commercial membranes to demonstrate the influence of different pore structures on the osmotic distillation concentration process . With the vapor pressure difference between two sides of the membrane being the driving force, the dilute aqueous solutions of ILs can be concentrated to about 84 wt % after 24 h with a water flux of 7.8 kg m −2 h −1 . It is also able to achieve ultra-high rejections to ILs and MgCl 2 (>99.99%) by this osmotic distillation process. Although there exists a limitation for dewatering the ILs solutions with very high concentrations and thus the final ILs purity cannot reach 100%, this method is promising for practical applications benefiting from its high rejection to ions, easy operability at ambient temperature and remarkable universality in terms of hydrophobic membranes used.
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高影响因子
CHEMICAL ENGINEERING SCIENCE
·
2025
·
IF 4.3
Ying Zeng,Xinlu Li
Biomass-activated carbon is generally used in ultra-clean rooms to remove sulfur dioxide (SO 2 ) molecular impurities. However, its high air resistance and excessive chemical residues needs resolution. In this study, we have developed millimeter-sized mesoporous carbon beads (MCBs) using a silica sol and reverse-phase suspension polymerization. The microstructure of MCBs was characterized by various techniques, including X-ray diffraction, Raman spectroscopy and scanning electron microscopy. The MCBs were categorized into three distinct groups based on particle size and were loaded with tetramethyl guanidine lactate (TMGL) or 1-ethyl-3-methylimidazolium acetate ([EMIM][OAc]), respectively. It was found that the MCBs exhibit a perfect spherical shape, smooth surface, high strength, and effectively reduce air resistance. Notably, the MCBs loaded with [EMIM][OAc] demonstrated a remarkable SO 2 adsorption capacity of up to 36.7 mg/ml, and the feasibility to remove SO 2 as a new absorption material for ultra-clean room.
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高影响因子
Bioresource Technology Reports
·
2023
·
IF 0
Qingqing Zhu,Die Gao,Dongxia Yan,Jing Tang,Xiujie Cheng,Ibrahim El Tantawy El Sayed,Nour Sh. El-Gendy,Xingmei Lu,Jiayu Xin
Efficient utilization of ionic liquids (ILs) for transforming lignocellulose into biofuel and alleviating concerns over shortages of nonrenewable resources is still an urgent issue. Herein, a highly efficient one-pot bioethanol production with biocompatible ILs was designed. XRD , TGA, and DSC analysis showed that pre-treatment of corn stalk with [Ch][Gly] trend to become easier to depolymerize than the untreated sample. Under one-pot process, the efficiency of [Ch][Gly] pretreated method could achieve a 9-fold sugar yield, i.e., 324.7 mg glucose/PU and 131.8 mg xylose/PU (1 PU = 10 g, 3 wt% [Ch][Gly] aqueous). The conditions for the whole process were optimized and the maximum yield% were achieved 80 % for glucose, 79 % for xylose , and 84 % for bioethanol . Besides, we found that increasing surface area and pore size could enhance accessibility for enzymes to attack cellulose and hemicellulose . The proposed study offers an efficient one-pot bioethanol production strategy with sustainable ILs.
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DOI
Journal of Thermal Science
·
2026
·Vol. 35
·期 4
·1342-1354
·
IF 3.2
Hao Yunze,Gong Yutong,Liu Feng,Lv Yanlong,Wang Yuhao,Li Jinping
In response to increasing energy demands, absorption heat transformers (AHTs) have been widely employed as efficient energy conversion devices across various fields. However, existing working pairs (e.g., LiBr/H 2 O and NH 3 /H 2 O) exhibit high corrosiveness and limited thermal stability, significantly restricting their applicability in high-temperature environments. Therefore, the development of high-performance working pairs is crucial for improving the efficiency and stability of AHT systems. In this study, four groups of ionic liquid-based ternary matrix pairs: LiBr-[EMIM]Cl/H 2 O (1:2), LiBr-[EMIM]Cl/H 2 O (1:3), LiBr-[EMIM][DEP]/H 2 O (1:3), and LiBr-[EMIM][DMP]/H 2 O (1:3), were systematically evaluated through short-term corrosion experiments. The effects of corrosiveness, thermal stability, density, viscosity, and specific heat capacity were analyzed. Experimental results and data analysis clarified the high-temperature properties of ionic liquids, while thermogravimetric analysis and viscosity measurements were conducted to evaluate the relative merits of different working pairs. Results indicate that the LiBr-[EMIM]Cl/H 2 O (1:2) system exhibits the lowest corrosiveness and good thermal stability, making it suitable for corrosion-sensitive AHT systems, while the LiBr-[EMIM][DMP]/H 2 O (1:3) system demonstrates optimal thermal stability at high temperatures, rendering it a complementary solution for high-temperature applications. This study establishes an experimental basis for optimizing AHT working pairs and provides essential data to inform their selection in AHT systems.
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高影响因子
CHINESE JOURNAL OF CHEMICAL ENGINEERING
·
2026
·
IF 3.5
Liyan Zhao,Yi Hui,Xi Zhang,Junya Cao,Yan Cao,Peng He,Huiquan Li,Liguo Wang
Methyl diphenylmethane dicarbamate (MDC) is a key intermediate in the non-phosgene synthesis of diphenylmethane diisocyanate (MDI), which serves as an essential raw material for polyurethane production. In this work, six triethylamine-based sulfonic acid-functionalized ionic liquids (TEA-SAILs) were synthesized and employed as catalysts for the condensation reaction of methyl phenyl carbamate (MPC) to MDC under solvent-free conditions. Among the synthesized TEA-SAILs, [TEA PS][HSO 4 ], possessing the highest acidity, exhibited excellent catalytic activity with an MDC yield of up to 84.2% and a selectivity of 93.5% under mild conditions, which compares favorably with numerous reported catalytic systems. The plausible reaction pathway for the MPC condensation catalyzed by [TEA PS][HSO 4 ] was proposed based on In-situ FT-IR experiments and DFT calculations, suggesting a nucleophilic substitution mechanism. [TEA PS][HSO 4 ] demonstrates remarkable reusability and can be efficiently recovered via simple heterogeneous separation. TEA-SAIL not only enhances reaction efficiency but also substantially reduces the required reactor volume, aligning with the principles of green and sustainable chemical manufacturing. Download: Download high-res image (196KB) Download: Download full-size image
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高影响因子
TRIBOLOGY INTERNATIONAL
·
2026
·
IF 7.6
Kaiyuan Xue,Mengzhao Wang,Xiaoming Zong,Yuqian Huang,Yang Xiao,Mengfei Xu,Heng Zhang,Chengfeng Du,Yong Yang,Sergey Chizhik,Xuqing Liu,Weihong Qi,Weimin Liu
Developing high-performance lubricants capable of withstanding severe operating conditions is crucial for modern engineering applications. In this work, a high-purity di-imidazolium-based ionic liquid (DImIL), 1-hexyl-3-dimethylimidazolium di[bis(trifluoromethyl)imide] (C 6 di[MIM].di[TFSI]), was synthesized and systematically evaluated against a traditional monoimidazolium-based ionic liquid (MImIL), 1-ethyl-3-methylimidazolium bis(trifluoromethylsulfonyl)imide (EMIM.TFSI) and a commercial base oil, polyalphaolefin 10 (PAO10). Tribological tests demonstrate that C 6 di[MIM].di[TFSI] exhibits superior lubrication performance. Under additive-free conditions, C 6 di[MIM].di[TFSI] achieves a stable friction coefficient (COF) of 0.100 and reduces the wear volume by 69% compared with EMIM.TFSI (COF of 0.125). Notably, C 6 di[MIM].di[TFSI] demonstrates exceptional load-carrying capacity, maintaining a COF of 0.092 even under an extreme load of 1100 N, whereas the EMIM. TFSI fails at 450 N. The mechanism behind this enhancement was further elucidated through surface chemical analysis and molecular dynamics (MD) simulations. Chemically, C 6 di[MIM].di[TFSI] facilitates the formation of a robust composite tribofilm consisting of “soft” FeS and “hard” FeS 2 , providing synergistic protection and solid lubrication to the contact interface. Physically, the unique dicationic structure of C 6 di[MIM].di[TFSI] enables strong anchoring to the metal substrate, forming a highly dense adsorption layer. This anchored layer minimizes internal viscous dissipation by forcing the shear motion to localize at the topmost interface. This study highlights the potential of DImILs as advanced lubricants through a unique “dual-protection” mechanism combining chemical film formation and physical shear shielding.
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高影响因子
JOURNAL OF DISPERSION SCIENCE AND TECHNOLOGY
·
2025
·
IF 1.9
Li Liu,Shuaishuai Zhao,Bo Zhou,Zhihao Li,Zhiqiang Wang,Jinyun Wei,Yanfu Pi,Mengyi Xing,Junfeng Wang
CO2 flooding technology demonstrates advantages such as injectability and miscibility in low-permeability reservoir development; however, asphaltene deposition during the displacement process leads to pore-throat blockage and permeability reduction. To address this issue, this study systematically investigated the inhibitory effects of three ionic liquids and one commercial inhibitor on asphaltene deposition in crude oil, with the underlying mechanisms elucidated through molecular dynamics simulations based on interaction energy. Additionally, CO2 flooding coupled with nuclear magnetic resonance was employed to quantitatively characterize the damage extent of asphaltenes to reservoir physical properties and pore structures during CO2 displacement. Experimental results demonstrated that after inhibitor addition, the asphaltene precipitation onset point of oil samples significantly increased from 34% to 52%, asphaltene aggregate particle size decreased from 1,082 nm to 410 nm, and turbidity values declined by 10–30%. This improvement is attributed to the ionic liquids’ ability to disrupt asphaltene molecular association via electrostatic interactions, steric hindrance, and hydrogen bonding, while simultaneously modifying the system’s polarity, thereby effectively inhibiting asphaltene deposition. Molecular dynamics simulation results exhibited strong consistency with experimental findings. The inhibitors mitigated the adverse impacts of asphaltene deposition on core porosity, permeability, and blockage rates. This study reveals that ionic liquids hold significant potential for inhibiting asphaltene deposition during CO2 flooding in low-permeability reservoirs.
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DOI
高影响因子
CHEMICAL ENGINEERING JOURNAL
·
2026
·
IF 13.2
Hui Duan,XiaoQian Yao,Rana R. Neiber,Xingbo Jie,XiuJie Cheng,Jiayu Xin,Qing Zhou,Yi Li,Junli Xu,Dongxia Yan,Yu Zhang,Xingmei Lu
The transformation of waste polyethylene terephthalate (PET) into high-value functional materials remains a key challenge for sustainable polymer circularity. Here, we report a sustainable PET-derived zwitterionic gel in which phosphonium-based ionic liquids modulate the network through ion-dipole and ion-ion interactions, while the PET-based polyurethane functions as a structural regulator providing additional hydrogen-bond anchoring. The deep-eutectic betaine/Zn(OAc) 2 solvent serves as an efficient catalyst for PET glycolysis, enabling sustainable conversion of PET into polyurethane precursors. The ionic liquids act as dynamic cross-linking centres that densify chain packing, enhance charge transport, and facilitate stress delocalization throughout the dual network structure. When combined with the PET-PU-derived hydrogen-bond framework and MXene fillers, the gel preserves high conductivity and integrity in the presence of large deformation. The optimized gel exhibits a high toughness (486.9 kJ m −3 ), 856% elongation, ultralow modulus (0.078 MPa), and a high adhesion (245.8 kPa), which is similar to, or even higher than, human skin. The gel can be used as a flexible electronic-skin sensor that has a wide strain range (0–856%), high sensitivity (maximum gauge factor of 4.24 in the high-strain region), a detection limit of 0.5%, and stability of more than 1000 cycles. This work highlights ionic-liquid-induced dynamic cross-linking as a key mechanism governing mechanical and electrical performance, establishing a sustainable PET upcycling strategy for next-generation soft bioelectronic materials.
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高影响因子
危险品化学品经营许可证（带存储）