Materials Today Nano
·
2022
·
IF 13.364
K. Wang,L. Liu,Y. Liu,J. Luo
Macroscale superlubricity is a new field that can greatly reduce energy consumption due to friction, which accounts for approximately 30% of human nonrenewable energy. However, prior research on liquid superlubricity mostly involved low contact pressures (<600 MPa). Here, we evaluated the lubrication and adsorption properties of ionic liquid alcohol solutions (ILs (as) ) with different alkyl chain lengths and monovalent anions between Si 3 N 4 and sapphire surfaces. Robust macroscale superlubricity and ultrahigh load capacity exceeding 1 GPa were obtained by protective adsorption layer caused by tribochemical reactions. Zeta potential measurements and simulation analysis revealed that the ceramic interfaces were enriched with numerous ionic liquid (IL) anions, preventing the direct collision of the asperities of the friction pairs. The relatively low sliding energy barrier and extremely strong electrostatic repulsion developed between these asperities enhanced the superlubricity and ultrahigh load capacity. Meanwhile, long alkyl chains and tetrafluoroborate anions more easily met the hydrodynamic boundary conditions at the solid–liquid interface, and the formation of low energy consumption channels through the smooth potential energy fluctuation surface generated extremely low shear stress. Such macroscale lubrication provides a novel method of achieving extremely high contact pressure in ILs (as) , which could enable liquid superlubricity in practical industrial applications.
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Journal of Cleaner Production
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2022
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IF 11.072
Ma Wenjing,Dai Shanshan,Li Xiaojiang,Hongsheng Lu
Oily wastes are easily generated in many processes of exploitation, solvent extraction is the common method for treating the oily waste. However, traditional solvent extractions are difficult to recycle the solvent, and oil is difficult to separated. As a low-volatility solvent, ionic liquid is simple in synthesis, low in cost, so it has good application prospect. In this work, the sustainable separation of oil from oily waste was implemented by using CO 2 -switchable ionic liquids. On the basis of solvent extraction, ionic liquids can reduced losses and costs. The CO 2 -switchable ionic liquids were prepared by poly (propylene glycol) bis(2-aminopropyl ether) D-230 and fatty acids with low volatility at the mole ratio of 1:2. Upon the alternate bubbling CO 2 and N 2, ionic liquids could be transformed alternately from water-miscible state to water-immiscible state. The water-immiscible state was bi-phasic system containing hydrophobic fatty acids and ammonium bicarbonate solution by bubbling CO 2 . Based on the bi-phasic system, the oil (kerosene, paraffin oil and crude oil) could be mixed with fatty acids, and were separated from fatty acids in the hydrophilic state upon N 2 , where the recovery rate of oil was more than 97% and fatty acids was not residual in recovered oil. Treating oily waste, the oil could be extracted from oily waste by the bi-phasic system. The ionic liquids were reused and the oil was separated by bubbling N 2 without extra additives, where the recovery rate of oil from oily waste was more than 85.57%. Due to the simplified process and negligible solvent loss, the economic benefit of recovering per barrel crude oil reached 76.7% of the price of crude oil. Compared with the existing technology , this sustainable separation is simpler, more economical and more environmentally friendly. Hence, it is expected that this sustainable separation based on CO 2 -switchable ionic liquids will meet the development of green separation with low-energy consumption.
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CHEMICAL PAPERS
·
2022
·Vol. 77
·期 1
·259-268
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IF 2.146
Ma Xiaofei,Zhang Chengchen,Cai Liangliang
This work describes a rapid and efficient method for visual chiral recognition by making use of chiral ionic liquids (CILs) based on shikimic acid and D-pipecolinic acid. Cooperation between copper (II) and appropriate solvents resulted in visual enantioselectivity responses of several amino acids and mandelic acid. All the enantiomeric distinguishment could be obtained within 3 min, depending on the difference of colour or solubility. Then, scanning electron microscopy, infrared spectroscopy, ultraviolet spectroscopy, thermogravimetric analysis and elemental analysis were employed to investigate the potential recognition mechanism. The results indicated that chiral recognition was strongly associated with the different stability between D-complex and L-complex. Furthermore, separation was achieved by treating the chiral sensor with racemic compounds. In the case of tryptophan, the proposed method provided good enantiomeric excess values (90.7% in solid phase and 63.2% in liquid phase). Graphical abstract
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Catalysis Science & Technology
·
2021
·Vol. 12
·期 6
·1756-1765
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IF 6.119
Wenjuan Fang,Fei Xu,Yaqin Zhang,Heng Wang,Zhencai Zhang,Zifeng Yang,Weiwei Wang,Hongyan He,Yunjun Luo
Using biomass and renewable feedstocks to prepare high value-added products instead of conventional petrochemicals has received extensive attention recently. In this work, a facile and phosgene-free approach for synthesizing bio-based polycarbonate is developed via melt polycondensation of isosorbide (ISB) and dimethyl carbonate (DMC), which are both derived from renewable biomass resources and CO2. Several kinds of acylamido-based anion-functionalized ionic liquids (ILs) are prepared and used as catalysts to promote the reaction of ISB and DMC. Their catalytic performances in the transesterification stage and the polycondensation stage are evaluated. Results show that acylamido-based ILs with a low anion–cation interaction energy and a high natural population analysis atomic charges of the nitrogen atom exhibited good catalytic performance. Furthermore, by using tetrabutylphosphonium phthalimide as the catalyst, the selectivity of carboxymethylation of DMC and conversion of ISB significantly increased to 99.6% and 99.0%, respectively. Quantum chemical calculations reveal that the dramatic enhancement of endo-OH reactivity originated from the interactions between the acylamido and –OH groups. Based on the NMR data and DFT calculations, a plausible synergistic catalytic mechanism involving cation–anion is proposed. This work not only provides guidance for the design and synthesis of efficient IL catalysts, but also is applicable to exploring the industrial possibilities of developing value-added bioproducts from renewable feedstocks.
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ACS Applied Materials & Interfaces
·
2021
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IF 9.229
Zhenyong Wang,Xiao Hou,Ning Duan,Yongyuan Ren,Feng Yan
Many creatures have excellent control over their form, color, and morphology, allowing them to respond to the interaction of environmental stimuli better. Here, the bioinspired synergistic shape–color-switchable actuators based on thermally induced shape-memory triethanolamine cross-linked polyurethane (TEAPU) and thermochromic ionic liquids (ILs) were prepared. The thermochromic ILs with various metalized anions, including bis(1-butyl-3-methylimidazolium) tetrachloro nickelate ([Bmim]2[NiCl4]) and bis(1-butyl-3-methylimidazolium) tetrachloride cobalt ([Bmim]2[CoCl4]), are investigated. The actuators exhibit thermochromic response, as evidenced by a shift in the color of the composites, which is due to the formation of the tetrahedral complex MCl42– (M = Ni and Co) after dehydration. The shape–color-switchable thermochromic actuators have strong molecular interaction between TEAPU and ILs and can mimic natural flowers and change the color and shape quickly in a narrow temperature range (30–70 °C). In addition, these thermochromic actuators can lift more than 50 times their weight and withstand strains of more than 1100%. The results represent the potential application in artificial muscle actuators and intelligent camouflages.
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PubMed
高影响因子
COLLOIDS AND SURFACES B-BIOINTERFACES
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2021
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IF 5.268
Hongbo Suo,Moju Li,Renmin Liu,Lili Xu
In this study, imidazolium-based ionic liquid with [tf 2 N] − as the anion was successfully grafted to magnetic polydopamine nanoparticles (MPDA). The prepared materials were well characterized and used as supports for lipase immobilization. The immobilized lipase (PPL-ILs-MPDA) exhibited excellent activity and stability. The specific activity of PPL-ILs-MPDA was 2.15 and 1.49 folds higher than that of free PPL and PPL-MPDA. In addition, after 10 rounds of reuse, the residual activity of PPL-ILs-MPDA was 86.2 % higher than that of PPL-MPDA (75.4 %). Furthermore, the kinetic assay indicated that the affinity between PPL-ILs-MPDA and substrate had increased. Analysis of the secondary structure using circular dichroism was used to explain the mechanism underlying the improvement in the performance of PPL-ILs-MPDA. In addition, the immobilized lipase can be easily separated from the reaction system with a magnet. The observations regarding the development of new supports for lipase immobilization may provide new ideas regarding further studies in this field.
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INDUSTRIAL & ENGINEERING CHEMISTRY RESEARCH
·
2021
·
IF 3.764
Bingbing Yang,Lu Bai,Zhenlei Wang,Haiyan Jiang,Shaojuan Zeng,Xiaochun Zhang,Xiangping Zhang
Ammonia (NH3) separation and recovery from NH3-containing gases favor resource utilization and ecological protection. Ionic liquids (ILs) are promising alternatives to fabricate polymer-based hybrid membranes with excellent and tunable properties. Herein, [Eim][NTf2] and [Emim][NTf2], with different hydrogen bond donating abilities and viscosities, were used to tailor NH3 transport properties in the membranes for enhancing NH3 separation performance. Poly(ether-block-amide) (Pebax)/[Eim][NTf2] membranes exhibit superior NH3 permeability of 2118.7 Barrer with NH3/N2 and NH3/H2 selectivities of 467.0 and 127.2, respectively. NH3 solubility in Pebax/[Eim][NTf2] membranes increases significantly when increasing the IL content, while the solubility in Pebax/[Emim][NTf2] membranes is almost unchanged, mainly because the hydrogen bond interaction between NH3 and [Eim][NTf2] is stronger. NH3 diffusion in Pebax/[Eim][NTf2] membranes decreases when increasing the IL content, while the diffusion in Pebax/[Emim][NTf2] membranes exhibits the reverse trend, corresponding to NH3 diffusion properties in pure ILs. Therefore, NH3 solubility is the more dominant factor in improving NH3 permeability in the membranes.
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Polymers
·
2021
·Vol. 13
·期 2
·196
·
IF 4.329
Wensi Li,Shengyu Feng
This study reports a novel series of imidazolium ionic liquids (ILs) based on polyhedral oligomeric silsesquioxanes (POSS) towards effective detection of metal ions, especially Fe3+ ion.1H,13C,29Si NMR, high resolution mass spectra (HRMS) and Fourier transform infrared spectra (FTIR) were applied to confirm the structures of the ILs based on POSS (ILs-POSS). The three ILs-POSS were synthesized via a green chemistry approach—a thiol-ene “click” reaction without metal ions as catalysts. Furthermore, the spherical vesicle structures of the ILs-POSS were observed and caused by self-assembly behaviors. Through comprehensive characterizations, these ILs-POSS have performed excellent thermal stabilities and low glass transition temperatures. In addition, we found it very meaningful that the limits of detection (LODs) of the three ILs-POSS for the detection of the Fe3+ion were 7.91 × 10−8M, 1.2 × 10−7M, and 1.2 × 10−7M, respectively. These data illustrate that these ILs-POSS have great potential for the detection of the Fe3+ion. In conclusion, this study not only prepared novel ILs-POSS, but also provided new materials as fluorescent sensors in the detection of Fe3+.Keywords:ionic liquids;thiol-ene “click” reaction;polyhedral oligomeric silsesquioxanes;fluorescent sensors
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Journal of Cleaner Production
·
2020
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IF 7.246
Yongliang Xu,Yang Liu,Yunchuan Bu,Menglei Chen,Lanyun Wang
A large amount of SOx will be produced in the combustion process of coal without desulfurization , which is the main factor causing air pollution, environmental damage and PM2.5 increase. Here, desulfurization of coal by chemical agents are summarized. Acid/alkali desulfurization and occur mainly through the chemical reaction of an acid/alkali with a metal oxide or sulfate (such as calcium oxide and ferric sulfate) to remove sulfur from coal, which can only remove a small amount of inorganic sulfur and organic sulfur. Moreover, the combination of an organic solvent with an acid/alkali for desulfurization can transform the organic sulfur molecule into an inorganic sulfur salt in an acid/alkali environment due to cyclic polar compounds containing oxygen or nitrogen that react with coal molecules and dissolve part of the coal molecules. Furthermore, microwave combined with chemical reagents for desulfurization shows better desulfurization efficiency and economy, but most of them were aimed at the removal of oil and model sulfur, and there were few studies on sulfur removal from coal. In view of the advantages of low volatility and high recycling rate of ionic liquids (ILs), the research progress and mechanism of action of ionic liquids in coal desulfurization are reviewed. It is found that acidic ionic liquids can be combined with hydrogen in coal to effectively dissolve organic sulfur. While the acidic ionic liquid was applied in combination with the oxidant hydrogen peroxide, the desulfurization effect appears more significant. The –SH and -S-S- functional groups in coal could be better oxidized by hydrogen peroxide to sulfone and sulfoxide, which was due to the oxidation promoted by acidic ionic liquids.
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ENERGY & FUELS
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2020
·
IF 3.421
Cui-Ping Ye,Rui-Nan Wang,Xia Gao,Wen-Ying Li
To screen the efficient media for CO2 capture of flue gas from power plants, a strategy for improving the CO2 capture capacity by dual functionalized ionic liquids (ILs) with multiple active sites is proposed. Three phosphonium dual functionalized ILs ([aP4443][2-Np], [aP4443][2-Op], and [aP4443][Triz]) have been prepared. The sorption capacities of the synthesized ILs under pure CO2 atmosphere and the supported ILs under different loading amounts from 10 to 50%, temperatures of 30–80 °C, and CO2 partial pressure varied from 10 to 15% were determined. Fourier transform infrared (FTIR) spectroscopy was applied to reveal the interaction between CO2 and ILs, and the pseudo-second-order model and the intraparticle diffusion model were used for a better understanding of the CO2 adsorption behavior. The results showed that a high capacity up to 1.88 mol of CO2/mol of IL for [aP4443][2-Np] is achieved, and 30% IL–MCM-41 can reach 3.19 mmol/g with excellent reversibility under the atmosphere of CO2:N2 (15%:85%) at 30 °C and 0.1 MPa. Raising the temperature or decreasing the CO2 concentration is not conducive to improving the CO2 capacity. FTIR spectroscopy demonstrated that the amino and hydroxyl react with CO2 to form NHCOO– or CO3–. Combined with the activation energy calculation, the kinetic analysis revealed that the CO2 capture of supported ILs is an internal diffusion controlled physical adsorption.
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CHEMICAL ENGINEERING JOURNAL
·
2020
·
IF 10.652
Bingbing Yang,Lu Bai,Shaojuan Zeng,Shuangjiang Luo,Lei Liu,Jiuli Han,Yi Nie,Xiangping Zhang,Suojiang Zhang
As ecological pollution and resource waste caused by NH 3 emission become increasingly serious, thus the separation and recovery of NH 3 from exhausted gases is of great significance both for environment and economy. Herein, we present a kind of novel ionic liquids (ILs)-based hybrid membranes for efficient NH 3 separation. Protic ILs (PILs) are adopted to form self-assembled gas highways in the hybrid membranes with the nanostructures of a middle-sulfonated pentablock copolymer, exhibiting extremely high NH 3 affinity and gas diffusion. The highest NH 3 permeability and ideal NH 3 /N 2 selectivity is up to 2711 Barrer and 1407 at ambient temperature and 1 bar, much superior to the state-of-the-art membranes reported. The results indicated that the novel IL-based hybrid membranes are promising candidates for high-efficient NH 3 separation and purification.
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INTERNATIONAL JOURNAL OF BIOLOGICAL MACROMOLECULES
·
2020
·
IF 5.162
Xiying Wu,Hongmin Zhang,Shuhua He,Qin Yu,Yi Lu,Wei Wu,Ning Ding,Quangang Zhu,Zhongjian Chen,Yuhua Ma,Jianping Qi
The aim of this study is to evaluate the enhanced ability of various choline based ionic liquids (ILs) for dermal delivery of hyaluronic acid (HA). Eight ILs were synthesized via neutralization reactions, which were characterized using Fourier transform infrared spectrometer and proton nuclear magnetic resonance. The enhanced capacity of ILs varied with organic acids. The IL formed by choline and citric acid ([Ch][Cit]) exerted the strongest ability to promote HA penetrating deep into the skin among all ILs. The enhanced ability of [Ch][Cit] were still maintained and even improved after diluted by water although it could be disassociated partially according to electricity. The moisture and transepidermal water loss (TEWL) were employed to evaluate the effect of attenuating skin dehydration. As expected, the IL of choline and malic acid ([Ch][Mala]) and [Ch][Cit] increased moisture and decreased TEWL significantly by improving the penetration of HA into skin. Meanwhile, no irritation was observed on skin of nude mice after treatment by the three ILs which showed optimal enhanced effect. In conclusion, ILs could be high potential biocompatible carriers for facilitating HA dermal delivery to resist skin dehydration for medical or cosmetic uses.
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高影响因子
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