CHEMICAL ENGINEERING JOURNAL
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2025
·
IF 13.2
Shengwang Zou,Junfeng Wang,Yingqiu Wu,Yanan Dong,Huijao Wang,Yi Nie,Hongxiang Xu
Ionic liquids (ILs) have shown significant potential for industrial application in the cellulose regeneration process. However, the accumulation of impurities, especially phosphorus (P) from the raw materials, in the ionic liquid (IL) aqueous solutions generated during the cellulose regeneration process, seriously affects the performance of IL and the quality of the final products. In this study, a crystallization precipitation method was employed to investigate the removal of impurities from IL aqueous solutions. The results demonstrated that the presence of IL accelerated the phase transformation of amorphous calcium phosphate to hydroxyapatite, although it prolonged the time to reach equilibrium. The highest P removal efficiency was achieved at a Ca/P molar ratio of 1.67:1, with an increase in pH further enhanced the removal efficiency. The morphology and size of crystallization precipitates were significantly influenced by the reaction time, pH, IL concentration, and temperature. By optimizing the reaction conditions, a P removal efficiency of 88.82 % was achieved in IL aqueous solutions generated during the established hundred-ton-scale cellulose regeneration demonstration production line, with the process also exhibited synergistic removal capabilities for NO 3 − , SO 4 2− , and Mg 2+ . These findings suggested that this method effectively removed the P and other inorganic impurities from the IL aqueous solutions generated during the cellulose regeneration process.
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LANGMUIR
·
2025
·
IF 3.9
Li Li,Chao Song,Xiang Chen,Jingji Li,Lei Fan,Jie Han,Rong Guo
Lamellar liquid crystals (LLCs) exhibit significant potential in lubrication due to their unique layered structure. Introducing ionic liquids (ILs) to enhance the lubrication performance of the LLCs is a feasible approach. However, common ILs often demonstrate substantial corrosivity toward metals. In this study, LLCs were formed using oleic acid (OA) as the anion, alcoholamine solvents with corrosion-resistant properties (including monoethanolamine (MEA), diethanolamine (DEA), and triethanolamine (TEA)) as the cation, and glycerol (GL) as the solvent. The results reveal that the synergistic effect between the physical adsorption film and the tribochemical reaction film during friction significantly improves their lubricating performance. Notably, the OA/GL/MEA system outperforms OA/GL/DEA and OA/GL/TEA in lubrication properties, which can be attributed to its tighter intermolecular arrangement and smaller interlayer spacing, thereby providing enhanced mechanical strength. Furthermore, the ionic liquid-based LLCs exhibit negligible corrosiveness to steel, owing to the presence of carboxylic acid groups, unsaturated bonds, and hydroxyl groups in the molecular structure, which strengthen ILs adsorption on metal surfaces. Their combined lubrication efficacy and corrosion resistance render these LLCs highly promising for mechanical lubrication applications.
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ACS Sustainable Chemistry & Engineering
·
2026
·
IF 7.6
Bowen Li,Shuang Zheng,Guilin Li,Jiang Chang,Lu Bai,Yinge Bai,Xiangping Zhang,Shaojuan Zeng
To address the growing demand for efficient low-concentration CO2 capture from flue gas, functionalized ionic liquid (IL) hybrids─integrating ILs’ intrinsic CO2-philicity (specific functional group-CO2 interactions) and porous supports’ structural merits (high specific surface area, tunable pores, robust framework)─have emerged as promising adsorbents. In this work, a kind of novel polyamine IL (PIL) hybrid with narrowly distributed mesopores and ultrahigh IL loading over 70 wt % was fabricated by immobilizing the PIL triethyltetramine trifluoromethanesulfonate ([TETA][TfO]) onto a hydrophobic resin (XAD) featuring wide mesopores and a small fraction of macropores. At 313 K, 70 wt % [TETA][TfO]@XAD exhibited a high CO2 adsorption capacity of 3.09 mmolCO2/g-adsorbent at 1 bar and 2.35 mmol CO2/g-adsorbent at 0.15 bar. Notably, under simulated humid flue gas conditions (15 vol % CO2/5 vol % H2O balanced with N2), the PIL hybrid still could maintain a relatively stable adsorption capacity of 1.31 mmol CO2/g-adsorbent, which is comparable to that under dry flue gas conditions (1.24 mmol CO2/g-adsorbent, 15 vol % CO2 balanced with N2). Furthermore, after three consecutive adsorption–desorption cycles, the PIL hybrid maintained structural integrity and stable CO2 adsorption performance without significant attenuation under both dry and humid environments. The superior CO2 separation performance was attributed to the chemical interactions between CO2 and multiple amino groups (one secondary amine as well as two primary amines) of [TETA]+, coupled with the synergistic effect of the in situ-formed mesoporous structures. This work provides a feasible strategy for the rational design and development of mesoporous PIL hybrids for the efficient capture of low-concentration CO2 from flue gas.
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JOURNAL OF ANALYTICAL CHEMISTRY
·
2026
·
IF 1.5
Qi Haolong,Liu Haixin,Shen Xin,Zhang Yuanyuan,Xu Xiang,Yang Kexin,Wei Linyi,He Yongrui,Sun Tao,Cai Zhiqiang
Pillar[ n ]arenes ( n = 5–10), novel macrocycles, are gaining prominence in supramolecular studies owing to their distinctive three-dimensional architecture featuring a π-electron-rich cavity and have emerged as a key synthetic macrocyclic host in research. Extended pillar[ n ]arenes ( Ep[ n ]As ) notably feature sizable internal voids, adaptable structures, versatile cavity shapes, and ease of synthesis. This work presents the first example of imidazolium ionic liquid-functionalized Ep[ n ]As (BpP6A-C10-IM-C8[NTf 2 ]) as a gas chromatography stationary phase. The BpP6A-C10-IM-C8[NTf 2 ] column was prepared by the static method, exhibiting medium polarity and high column efficiency (4660 plates/m, k = 2.29). The separation performance of the prepared column was evaluated for analytes, including a mixture of 22 analytes, more than 12 positional isomers, and 8 cis- / trans- isomers. Furthermore, the chromatograms of the challenging isomers of bromonitrobenzenes, chloronitrobenzenes, bromobenzaldehydes, toluidines, and dimethylanilines on the BpP6A-C10-IM-C8[NTf 2 ] column were compared with those on the BpP6A-C10 column and commercial HP-5 and HP-35 columns. The BpP6A-C10-IM-C8[NTf 2 ] column also showed high selectivity for biphenyl isomers, including methylbiphenyls, iodobiphenyls, and bromobiphenyls.
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BIOPROCESS AND BIOSYSTEMS ENGINEERING
·
2026
·
IF 4.3
Huang Ziling,Yang Rongling,Zhao Xiangjie,Zhu Chun,Tong Yuli,Li Xiaoyan,Luo Hongzhen
A highly efficient and regioselective method for the synthesis of pharmacologically active geniposide 6´-cinnamate is reported herein for the first time, employing Aspergillus oryzae whole cells as biocatalysts in an acetonitrile-ionic liquid co-solvent system. The catalytic performance was markedly enhanced in the presence of ionic liquids compared to the pure acetonitrile system, with catalytic efficiency influenced by the nature of the anion species (e.g., BF₄⁻, PF₆⁻, Tf₂N⁻) and the structure of the cation (including [BMIM]⁺, [OMIM]⁺, [HMIM]⁺). In the optimized acetonitrile-[OMIM][PF₆] (1%, v/v) system, 99% substrate conversion was achieved within 24 h, with an initial reaction rate of 10.88 mmol·L⁻¹·h⁻¹, approximately twice that observed in pure acetonitrile (5.1 mmol·L⁻¹·h⁻¹). Furthermore, the catalyst exhibited excellent 6’-regioselectivity (> 99%) and remarkable operational stability, retaining 42% of its initial activity after six consecutive batches. In conclusion, incorporating ionic liquids as co-solvent effectively promotes catalytic modification of geniposide in whole cells, offering a novel and economically viable strategy for efficiently synthesizing its derivatives.
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CARBOHYDRATE POLYMERS
·
2015
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IF 4.074
Yongjun Men,Xiyan Du,Jianan Shen,Leli Wang,Zhengping Liu
The copolymer of starch grafted with polystyrene (starch- g -PS) was synthesized with high grafting percentage by utilizing the ionic liquid 1-ethyl-3-methylimidazolium acetate ([EMIM]Ac) as solvent and potassium persulfate as initiator. The effect of various parameters upon the polymerization were studied including: initiator concentration, styrene:starch weight ratio, the reaction time and temperature. Grafting percentages were calculated using an FT-IR calibration method, with values up to 114%. The resulting copolymer was characterized using FT-IR, SEM, WAXD and TGA, which demonstrated that polystyrene side chains were evenly distributed on the starch backbone. Our results indicate that ionic liquid dissolution of starch, prior to polystyrene grafting, is a versatile methodology for the synthesis of amphiphilic, polysaccharide-based graft copolymers, having high grafting percent.
研究领域:
高分子化学
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材料科学
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绿色化学
·
碳水化合物化学
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ACS Applied Materials & Interfaces
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2022
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IF 10.383
Meilin Yin,Lipeng Wang,Shaokun Tang
Rationally integrating desired functional components into a composite material can endow the tailored function to achieve the corresponding purpose. This is the first case where a series of [AeImBr]X%-TAPT-COFs (X = 0, 17, 33, 50, 67, 83, 100) were fabricated by chemically integrating the amino-functionalized imidazole ionic liquid (NH2-IL) onto channel walls of mesoporous covalent organic framework materials ([HO]X%-TAPT-COFs). By virtue of the polar groups (amino groups) and abundant imidazole cations of NH2-IL and its microporous nature, the obtained [AeImBr]X%-TAPT-COFs exhibit higher CO2 capture activity than [HO]X%-TAPT-COFs. Correspondingly, the CO2 equilibrium capture capacity increases from 62.6 to 117.4 mg/g, which is crucial to the storage of enough CO2 around the catalytic active sites. Additionally, the synergistic effect of −NH2 and Br– in NH2-IL can also improve the cycloaddition reaction rate. The characteristics of [AeImBr]X%-TAPT-COFs contribute to the efficient generation of cyclic carbonate through heterogeneously catalyzing CO2-epoxide cycloaddition without any solvents and cocatalysts. Specifically, [AeImBr]83%-TAPT-COF has a CO2 equilibrium capture capacity of 117.4 mg/g and cyclochloroallyl carbonate yield of 99.1%. As a result of the use of the chemical grafting method, [AeImBr]X%-TAPT-COFs possess excellent stability and cycle life. The equilibrium capture capacity and cyclochloroallyl carbonate yield reach 112.7 mg CO2/g adsorbent and 95.0% at the eighth cycle.
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COMPOSITES PART A-APPLIED SCIENCE AND MANUFACTURING
·
2023
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IF 8.7
Junwei Zhou,Wanjie Wang,Yihu Song,Qiang Zheng
Rubber nanocomposites exhibit marked strain softening upon large-amplitude oscillation shear and large-strain cyclic tension while there are rare ways developed for solving the awkward paradox between improving elasticity and weakening softening. Herein ionic liquid (IL), 1-ethyl-3-methylimidazolium acetate, at a content as low as 0.2 parts per hundred parts of rubber was introduced into carbon black (CB)/natural rubber (NR) nanocomposites for regulating the microstructure and viscoelasticity. The results show that IL could accelerate NR vulcanization, improve proportion of polysulfide crosslinking bonds and promote CB dispersity without marked influence on crosslinking density. It is of significance that IL could weaken Mullins effect by reducing dissipation and softening energies. It is fascinating that at CB volume fraction 0.231, IL could improve tensile strength and extensibility and weaken the Mullins effect simultaneously. The investigation is enlightening for tailoring elasticity and dissipation of vulcanizate nanocomposites by regulating the crosslinking network and CB dispersity.
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Journal of Materials Chemistry B
·
2022
·Vol. 11
·期 24
·5494-5502
·
IF 7.571
Yang Shu,Rong Xue,Yiru Gao,Wenxin Zhang,Jianhua Wang
Systemic administration of methotrexate (MTX), the gold standard for the treatment of psoriasis, can cause adverse side effects. To address this issue, a thermally responsive hydrogel loaded with an ionic liquid microemulsion (IL-ME) was developed for the transdermal delivery of MTX. The microemulsion was prepared using water, Tween 20 and choline and geranic acid (CAGE) ionic liquid. The solubility of methotrexate in the IL-ME was 9-fold higher than that in phosphate buffer (PBS). The hydrogel (Gel) based on isopropylacrylamide and silk fibroin acts as a drug reservoir to achieve temperature-responsive drug release in the human epidermis. The loading of the IL-ME or MTX-containing IL-ME on the Gel produced a ME@Gel or MTX/ME@Gel. In vitro permeation experiments showed that the MTX/ME@Gel exhibited a 27.6% increase in MTX permeation. In addition, IL-ME exhibits strong antibacterial activity. In vivo studies indicated that when compared with the results obtained in PBS medium, the MTX/ME@Gel could effectively treat skin redness, swelling and scaling caused by imiquimod (IMQ). In general, the present study demonstrated that the MTX/ME@Gel provides vast potential to serve as a biocompatible drug carrier for the efficient delivery of poorly soluble drugs, i.e., MTX in this particular case.
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JOURNAL OF COLLOID AND INTERFACE SCIENCE
·
2022
·
IF 9.965
Chao Liu,Yi Hou,Youming Li,Huining Xiao
In this work, nitrogen and phosphorus dual-doped alkali lignin-based carbon microspheres (MLCM) were prepared by pre-oxidation and carbonization of ionic liquid ([Mmim]DMP) -lignin solution and used as green-based supercapacitor electrode materials . Compared with the directly carbonized alkali lignin carbon (LC), MLCM had a spherical structure with higher specific surface area (938.1 m 2 /g) and pore volume (0.64 cm 3 /g). Moreover, MLCM materials showed superior electrochemical performance . In the 1 mol/L H 2 SO 4 electrolyte system, MLCM presented the highest specific capacitance of 338.2F/g at a current density of 0.8 A/g. Furthermore, MLCM was used as a positive and negative electrode material to assemble a symmetrical supercapacitor . The resultant device maintained excellent cycle stability after 5000 times of charging and discharging process at 2 A/g. Overall, the facile, green and sustainable synthesis strategy of heteroatom-doped porous carbon microspheres developed in this work opens a new avenue for the fabrication of high-performance carbon electrode materials, especially based on abundant and renewable lignin.
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Membranes
·
2022
·Vol. 12
·期 2
·189
·
IF 4.562
Peng Qi,Hongge Jia,Shuangping Xu,Qingji Wang,Guiming Su,Guoxing Yang,Mingyu Zhang,Yanqing Qu,Fuying Pei
In this paper, superhydrophilic polyimide (PI) membranes were prepared using the electrostatic spinning method, capped with a hydrophilic ionic liquid (IL), and blended with polyvinylpyrrolidone (PVP). Using this preparation, the surface of the fiber membranes was coated in polydopamine (PDA) by means of an in-growth method. Scanning electron micrographs showed prepared blend films can form continuous fibers, for whom the distributions of diameter and pore were uniform. Post-modification (carried out by adding hydrophilic substances), the ability of the membrane surface to adhere to water was also significantly improved. The water contact angle was reduced from 128.97 ± 3.86° in unmodified PI to 30.26 ± 2.16°. In addition, they displayed a good separation effect on emulsified oil/water mixtures. The membrane flux reached a maximum value of 290 L·m−2·h−1, with a maximum separation efficiency reached of more than 99%. After being recycled 10 times, the separation efficiency maintained a level exceeding 95%. The purpose of this study is to demonstrate the simplicity and efficiency of this experiment, thereby providing new ideas for the future application of membrane separation technology in wastewater treatment.Keywords:polyimide;membrane;electrospinning;ionic liquid;oil-water separation fiber;polydopamine;polyvinylpyrrolidone
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ACS ES&T Engineering
·
2022
·
IF 0
He Zhao,Shaojie Ren,Ines Zucker,Yan Bai,Yunkun Wang
Biofouling is a multifaceted and unavoidable problem in the application of membrane separation technology. Here, we functionalized polyvinylidene fluoride (PVDF) ultrafiltration membranes with poly(ionic liquid) (PIL) brushes to provide them with antibiofouling properties. The PIL brush grafted membranes (PIL-M) were prepared via atom transfer radical polymerization (ATRP) using different ionic liquids (ILs) on the membrane surface. Four functionalized membranes with different alkyl chain lengths (C4-M, C8-M, C12-M, and C16-M) were prepared to explore the relationship between surface structure and antibacterial properties. Our results showed that all of the PIL-M had antibacterial capabilities with the highest efficiency of 84.6% for the C12-M. Moreover, the antibacterial performance was improved by increasing the ATRP reaction temperature and time. Liposome vesicles were used as the bacterial cell membrane model to evaluate the antibacterial membrane damage mechanism. IL and PIL brushes could damage cell membranes through disrupting the lipid bilayer with longer alkyl chains associated with an enhanced effect. Zeta potential measurements showed that the interference of electrostatic interactions with bacteria also played an important role in the bactericidal mechanism. Moreover, filtration experiments in a cross-flow system further indicated that PIL-M membranes have favorable antibiofouling performance, with a stable flux increase 41.7% larger than that of the pristine PVDF membrane. Our results suggest that functionalization of the membrane surface with the PIL brushes can effectively resist bacteria and thereby significantly mitigate biofouling on the PVDF membranes.
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