ACS Sustainable Chemistry & Engineering
·
2021
·
IF 8.198
Yuanlong Guo,Long Cai,Gu Guo,Haibo Xie,Lihua Zhang,Longming Jin,Songmiao Liang,Lijie Hu,Qinqin Xu,Qiang Zheng
Regenerated cellulose membranes (RCMs) were prepared from cellulose sufficiently dissolved in [TMGH]2+[OOCOCH2CH2OCOO]2–/DMSO (XILS = 0.2, XILs is the mole fraction of reversible ionic liquids in the mixed solvents) mixed solution under mild conditions (50 °C, 3 h, PCO2 = 0.2 MPa) using different coagulation baths of ethanol, methanol, NaOH, and H2SO4 aqueous solutions. The structure and properties of these membranes were characterized using various characteristic technologies. The membrane regenerated from ethanol exhibited good thermostability and mechanical, water vapor, and oxygen barrier properties with a tensile strength of 56.2 MPa, a tensile strain of 20.4%, an excellent water vapor permeability of 8.7 × 10–3 g μm/m2 day kPa, and an oxygen permeability (OP) of 4.087 cm3 μm/m2 day atm. The membranes regenerated from aqueous solutions of alkali and acid have an OP that tends to zero. This study provides a novel dissolving strategy to prepare cellulose membranes that have potential applications in the packaging, food, and agricultural industries.
研究领域:
材料科学
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化学工程
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DOI
高影响因子
Molecular Catalysis
·
2020
·
IF 3.687
Bingjie Ding,Ran Zhang,Qingqing Zhou,Wenbao Ma,Anna Zheng,Difan Li,Yefeng Yao,Zhenshan Hou
This work demonstrated that the specific ionic liquids (ILs) have been designed via the supramolecular complexation between 18-crown-6 (CE) and ammonium peroxoniobate (NH 4 -Nb). The resultant ILs have been characterized by elemental analysis, FT-IR, Raman, NMR, DSC, conductivity measurement and MALDI-TOF, etc. The IL (CE-1) consisting of CE and ammonium peroxoniobate can be further coordinated with GLY to generate a new IL (CE-2), which showed both high catalytic activity in epoxidation with H 2 O 2 and good recyclability. The characterization of 93 Nb NMR spectra revealed that the peroxoniobate anions has demonstrated a structural evolution in the presence of hydrogen peroxide, in which Nb O species can be easily oxidized into the catalytically active niobium−peroxo species. Especially, the supramolecular complexation can provide suitable hydrophobicity, which ensured that the hydrophobic olefins and allylic alcohols were easily accessible to the catalytically active anions, and thus facilitated the epoxidation reaction. Notably, the supramolecular IL catalysts in this work exhibited a huge advantage of the easy availability, as compared with the previously reported peroxoniobate-based ILs. As far as we know, this is the first example of the highly selective epoxidation of olefins and allylic alcohols by using supramolecular ILs as catalysts.
研究领域:
化学工程
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催化科学
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DOI
高影响因子
JOURNAL OF MATERIALS SCIENCE
·
2021
·Vol. 56
·期 12
·7598-7612
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IF 4.22
Fang Huan,Li Dongrun,Xu Longquan,Wang Yi,Fei Xu,Tian Jing,Li Yao
Abstract Rapid and convenient treatment of wounds is urgently needed in daily life. It is very essential to finish the dressing and antibacterial treatment in one step. In this study, we developed a reusable ionic liquid-grafted antibacterial cotton gauze wound dressing using 1-vinyl-3-butylimidazolium bromide, 3-aminopropyltriethoxysilane, glycidyl methacrylate and butyl acrylate. The ionic liquid was grafted onto the surface of the cotton gauze through covalent bond to obtain antibacterial properties. The successful grafting was confirmed by Fourier transform infrared spectroscopy, scanning electron microscopy and energy-dispersive X-ray spectroscopy. The biocompatibility, antibacterial ability and wound healing properties of antibacterial cotton gauze were evaluated. The antibacterial cotton gauze exhibited effective antibacterial ability against Escherichia coli ( E. coli ), Staphylococcus aureus ( S. aureus ) and Candida albicans ( C. albicans ), and they were not cytotoxic to L929 mouse fibroblasts. The reusability experiment showed that the antibacterial cotton gauze had good antibacterial activity even after three repeated antibacterial tests. In addition, the antibacterial cotton gauze effectively promoted skin wound recovery in a rat model. These results indicated that the antibacterial cotton gauze could be used in the biomedical field, especially as an antibacterial wound dressing. Graphical abstract
研究领域:
生物医学工程
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材料科学
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微生物学
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DOI
高影响因子
Journal of Materials Chemistry A
·
2018
·Vol. 6
·期 34
·16566-16573
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IF 9.931
Danke Chen,Wensen Wang,Wen Ying,Yi Guo,Donghui Meng,Youguo Yan,Rongxin Yan,Xinsheng Peng
The modern global climate change and global warming of Earth make it an urgent need to develop emerging CO2 capture and storage techniques. Herein, we first reported the use of WS2 nanosheets to construct laminated membranes for CO2 separation. However, the WS2 membrane showed poor CO2 separation performance with Knudsen selectivities for N2/CO2 (1.28), CH4/CO2 (1.72) and H2/CO2 (4.96). To improve the performance, an ionic liquid (IL) 1-butyl-3-methyl imidazolium tetrafluoroborate ([BMIM][BF4]) with high CO2 solubility and practically no vapour pressure was used for filling the nanochannels of the WS2 membrane. Compared to the bulk IL, the nanoconfined IL exhibits higher freezing temperature, shift of vibration bands and higher interaction energy between CO2 and ILs. Besides, the prepared WS2 laminated membrane with the nanoconfined ionic liquid shows excellent selectivities for CO2/N2 (153.21), CO2/CH4 (68.81) and CO2/H2 (13.56) in single gas measurements as well as good CO2 permeance due to the nanoconfinement of the IL. The simulation results further confirmed and explained the CO2 separation mechanism. It indicates that the nanoconfinement of ILs into the nanochannels of two-dimensional materials is a novel way to achieve CO2-philic membranes to efficiently separate CO2 from other light gases.
研究领域:
材料科学
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环境工程
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化学工程
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DOI
高影响因子
Inorganic Chemistry Frontiers
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2018
·Vol. 5
·期 10
·2478-2485
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IF 5.106
Xiao Chen,Ming Zhang,Yanchen Wei,Hongping Li,Jiaqi Liu,Qi Zhang,Wenshuai Zhu,Huaming Li
It is vital to develop efficient catalysts for desulfurization in fuels, reducing the pollution caused by sulfur oxides. In this study, polyoxometalate-based ionic liquid supported three-dimensionally ordered macroporous silica (IL-3DOM SiO2) was successfully prepared for heterogeneous oxidative desulfurization of aromatic sulfur compounds. The as-prepared material was characterized using FTIR, XRD, XPS, SEM, TEM, and BET analysis, exhibiting a large pore size and a high specific surface area. The hybrid material with a 3DOM structure exhibited excellent desulfurization performance on aromatic sulfur compounds under mild conditions. Furthermore, no obvious decrease in activity was observed after seventeen cycles, revealing a good stability of the hybrid material. The as-prepared IL-3DOM SiO2 is an ideal candidate for applications in the future desulfurization industry.
研究领域:
材料科学
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环境化学
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DOI
高影响因子
Catalysts
·
2018
·Vol. 8
·期 9
·351
·
IF 3.465
Bolin Wang,Huixia Lai,Yuxue Yue,Gangfeng Sheng,Yaqin Deng,Haihua He,Lingling Guo,Jia Zhao,Xiaonian Li
An efficient and stable heterogeneous Zeolite Supported Ionic Liquid Catalyst (IL/CaX) has been explored in acetylene hydrochlorination reaction. The IL/CaX catalyst exhibits excellent space time yields of vinyl chloride (VCM), when compared to the benchmark of Au/C systems. Through characterization and kinetic studies, the reaction follows a two-site mechanism, which is described as the adsorbed hydrogen chloride on the Ca2+in zeolite, reacting with the adsorbed acetylene on the cation of ionic liquid to form vinyl chloride. The catalytic reaction takes place at the IL/CaX interface, whilst the upper interphase IL/CaX is not active. The deactivation of the catalyst is caused by the dissolving byproducts in the ionic liquid layer, which can be reactivated by a simple vacuum procedure. It is of great significance to study and develop green non-mercury catalysts, in acetylene hydrochlorination.Keywords:zeolite supported ionic liquid catalyst;IL/CaX;Ca2+;acetylene hydrochlorination
研究领域:
催化
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化学工程
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环境化学
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DOI
高影响因子
AICHE JOURNAL
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2013
·Vol. 59
·期 12
·4696-4704
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IF 2.493
Jun Xiong,Wenshuai Zhu,Huaming Li,Yehai Xu,Wei Jiang,Suhang Xun,Hui Liu,Zhen Zhao
MCM-41-supported Fenton-like ionic liquid catalysts were synthesized by the grafting method and applied in the removal of sulfur compounds in model oil. The structure and property of the catalysts were characterized by Fourier transform infrared spectra, X-ray diffraction, diffuse reflectance spectra, transmission electron microscopy, thermogravimetric and differential scanning calorimetry, and N 2 adsorption-desorption. Results suggested that Fenton-like ionic liquid was supported on mesoporous material MCM-41. Different desulfurization systems were studied. The results indicated that at room-temperature (30°C) for 1 h, MCM-41-supported Fenton-like ionic liquid in extraction combined with catalytic oxidative desulfurization (ECODS) system showed a high catalytic activity with H 2 O 2 as the oxidant, and [Omim]BF 4 as the extractant. Different factors, such as temperature, the amount of H 2 O 2 , solvent, and different sulfur-containing compounds for sulfur removal were investigated. Through the gas chromatography-mass spectrometer (GC-MS) analysis, dibenzothoiphene sulfone was proved to be the only product of dibenzothiophene oxidizing reaction. Furthermore, the process of ECODS was confirmed by GC-MS results. © 2013 American Institute of Chemical Engineers AIChE J , 59: 4696–4704, 2013
研究领域:
化学工程
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环境科学
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DOI
高影响因子
Nanomaterials
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2019
·Vol. 9
·期 8
·1096
·
IF 4.034
Liyuan Zhao,Renyan Zhang,Chuyun Deng,Yuanxi Peng,Tian Jiang
Controllably tuned infrared emissivity has attracted great interest for potential application in adaptive thermal camouflage. In this work, we report a flexible multilayer graphene based infrared device on a porous polyethylene membrane, where the infrared emissivity could be tuned by ionic liquid intercalation. The Fermi level of surface multilayer graphene shifts to a high energy level through ionic liquid intercalation, which blocks electronic transition below the Fermi level. Thus, the optical absorptivity/emissivity of graphene could be controlled by intercalation. Experimentally, the infrared emissivity of surface graphene was found to be tuned from 0.57 to 0.41 after ionic liquid intercalation. Meanwhile, the relative reflectivity Rv/R0of surface graphene increased from 1.0 to 1.15. The strong fluorescence background of Raman spectra, the upshift of the G peak (~23 cm−1), and the decrease of sheet resistance confirmed the successful intercalation of ionic liquid into the graphene layers. This intercalation control of the infrared emissivity of graphene in this work displays a new way of building an effective thermal camouflage system.Keywords:graphene;ionic liquid;intercalation;flexible;infrared emissivity
研究领域:
材料科学
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光学工程
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DOI
PubMed
高影响因子
NEW JOURNAL OF CHEMISTRY
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2019
·Vol. 43
·期 43
·16881-16888
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IF 3.069
Tenghe Zhang,Xinlu Li,Hang Song,Shun Yao
In order to both investigate the universality of ionic liquid-based catalytic systems for synthesis of triterpene saponins and explore their effective application methods together with the catalytic behaviors of ionic liquids in related reactions by comparison between different initiators, oleanolic acid and ursolic acid were selected to establish a catalytic system for glycosylation in this study as typical representatives of pentacyclic triterpene sapogenins. As a result, it was found that the system of [C4mim][OTf] + TMSOTf in the reactions between the glycosyl receptors and donors showed obvious catalytic effects; also, the system was stable and could be recycled. The functions of IL include solvent, cocatalyst and stabilizer, simultaneously; thus, the current catalytic system is greener, simpler and more efficient. The reaction time was short, and only β-type products were obtained. This study offers a reference for developing a new glucoside synthesis technology and provides sufficient preliminary exploration and basic data for further large-scale applications.
研究领域:
有机化学
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药物化学
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DOI
高影响因子
ACS Sustainable Chemistry & Engineering
·
2016
·
IF 5.267
Zhenkang Li,Zhiping Wang,Qiwei Yang,Zhiguo Zhang,Yiwen Yang,Qilong Ren,Huabin Xing
Ionic liquid (IL)-mediated extraction methods have drawn much attention due to their reduced environmental impact and improved extraction efficiencies compared to traditional separation methods. However, one long-standing challenge in the application of IL-based extraction processes is the difficulty in recovering high-boiling solutes from the IL phase due to the negligible vapor pressure of ILs and the strong interaction between solutes and ILs. In this study, a new CO2-assisted back-extraction method was developed for the recovery of high-boiling solutes from the IL phase based on the reversible chemical absorption and/or strong physical interaction of CO2 with ILs. We found the distribution coefficient (D) of the typical solute δ-tocopherol in the [P4444][Pro]/DMSO–hexane biphasic system significantly decreased from 10.38 to 2.42 after the introduction of CO2, which greatly reduced the required solvent consumption and the number of back-extractions required for tocopherol recovery. For example, the number of back-extractions required for the recovery of 90% of the tocopherols from the [P4444][Pro]/DMSO–hexane biphasic phase decreased from 24 to 5 with the aid of CO2 absorption, along with a decrease in solvent consumption by approximately 80%. The effects of the structure of the IL, the loading of CO2, the type of cosolvents, and the temperature of the CO2-assisted back-extraction processes were investigated in this study. This proof-of-concept study demonstrates the great potential of CO2-assisted back-extraction as a green method for the efficient recovery of high-boiling solutes from the IL phase.
研究领域:
化学工程
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环境科学
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产品关联
DOI
高影响因子
CHEMISTRY-A EUROPEAN JOURNAL
·
2018
·Vol. 24
·期 59
·15897-15902
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IF 5.16
Binshen Wang,Yongan Feng,Xiujuan Qi,Mucong Deng,Junjun Tian,Qinghua Zhang
Graphical Going off with a bang ! A series of novel explosive poly(ionic liquid)s (E-PILs) are designed and prepared by introducing an energetic nitrato group and nitro-rich anions into polymeric chains. All E-PILs show higher detonation performances than state-of-the-art energetic polymers. The E-PILs are promising candidates for applications as binders and/or plasticizers for explosive formulations. The development of ionic-liquid-derived functional materials would be vital for stimulation of the interdisciplinary research in the fields of ionic liquid chemistry and material science. Here, a series of novel poly(ionic liquid)s with explosive capability were designed and prepared by introducing the energetic nitrato group and nitro-rich anions, such as nitrate, dinitramide, and nitroform into the polymeric chains. The as-synthesized explosive poly(ionic liquid)s (E-PILs) were fully characterized, and their physicochemical and detonation properties were investigated. All E-PILs show higher detonation performances than state-of-the-art energetic polymers including glycidyl azide polymer (GAP) and poly(glycidyl nitrate) [poly(GLYN)]. Some E-PILs exhibit higher calculated detonation velocities and pressures than 2,4,6-trinitrotoluene (TNT). These E-PILs are promising candidates for applications as new high-performance energetic polymers.
研究领域:
材料科学
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离子液体化学
·
能量材料
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产品关联
DOI
PubMed
高影响因子
INDUSTRIAL & ENGINEERING CHEMISTRY RESEARCH
·
2015
·
IF 2.587
Xueqin Zhang,Mingjie Chen,Huihui Wang,Chuanfu Liu,Aiping Zhang,Runcang Sun
In this study, xylan-graft-polycaprolactone (xylan-g-PCL) with different degrees of substitution (DS) and degrees of polymerization (DP) were prepared by homogeneous ring-opening graft polymerization (ROGP) of ε-caprolactone (ε-CL) onto xylan in ionic liquid (IL) 1-allyl-3-methylimidazolium chloride ([Amim]Cl) using 4-dimethylaminopyridine (DMAP) as catalyst. FT-IR, 1D (1H and 13C NMR) and 2D NMR (1H–13C HSQC and HMBC) spectra provided the evidence of the occurrence of ROGP reaction. 1H–1H COSY confirmed the correct assignment of the proton signals. HSQC also indicated that 38.78% and 61.22% of PCL side chains were attached to C2 and C3 positions of anhydroxylose units, respectively. Xylan-g-PCL copolymers were further characterized by TGA/DTG, SEM, and XRD. The results indicated that the thermal stability of xylan increased upon the DMAP-catalyzed ROGP reaction in [Amim]Cl, and the surface morphologies were significantly changed with increased DS.
研究领域:
高分子科学
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材料科学
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分析化学
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物理化学
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产品关联
DOI
高影响因子
危险品化学品经营许可证（带存储）