JOURNAL OF CHROMATOGRAPHY A
·
2011
·
IF 4.194
Jun Cao,Ping Li,Ling Yi
A new CE system using ionic liquids coated multi-walled carbon nanotubes (ILs-MWNTs) as pseudostationary phase was developed for the simultaneous determination of four flavonoids, four phenolic acids and two saponins. Several parameters affecting the separation were studied, including the choice of ILs, ILs-MWNTs concentration, the respective use of ILs and MWNTs, buffer pH, SDS concentration and borate content. Results revealed that the addition of ILs-MWNTs in running electrolytes enhanced the separation of target compounds compared to conventional micelle because the surface of carbon nanotubes interacted favorably with the analytes. Under the optimum conditions, a baseline separation was achieved for these analytes within 11 min in a 41.5 cm of effective length fused-silica capillary. At a voltage of 28.0 kV, the separation was carried out in a 10 mM borate buffer (pH 9.0) containing 100 mM SDS, 6% propanol and 4 μg mL −1 ILs-MWNTs. All calibration curves showed good linearity ( r 2 > 0.9990) within the test ranges. The intra- and inter-day precisions as determined from standard solutions were below 3.30% and 6.23%, respectively. The recoveries for ten compounds were found to range from 85.5 to 101.8%. The method was successfully applied for the determination of three types of compounds in Qishenyiqi dropping pills. Our experimental results indicated that the proposed method offered new opportunities for the analysis of complex samples.
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ACS Applied Materials & Interfaces
·
2022
·
IF 10.383
Rui Han,Qian Zhao,Abhijit Hazarika,Juan Li,Hongkun Cai,Jian Ni,Jianjun Zhang
Colloidal all-inorganic CsPbI3 perovskite quantum dots (PQDs) have shown tremendous potential in photovoltaic applications in recent years due to their outstanding optoelectronic properties that general metal halide perovskites offer, along with the added advantages that originates from size reduction and the quantum confinement effect. However, the issue of low carrier mobility in PQD films caused by insulating organic ligands capped on the PQD surface still remains to be addressed while aiming for high-efficiency PQD solar cells. Herein, we propose a novel strategy that takes benefits of ionic liquids, which can offer the high polarity and the electron donating ability to boost the mobility of PQD films in photovoltaic devices. Specifically, 1-propyl-3-methylimidazolium iodide to modulate the colloidal CsPbI3 PQD surface and couple QDs is demonstrated for the first time. The lone pair electrons on the nitrogen of the imidazole ring within the ionic liquid binds to the empty nonbonding surface orbitals of CsPbI3 PQDs while the long-chain insulating ligands are replaced, which enables not only efficient charge transport but also reduced defect density in the assembled PQD solid films. The resulting CsPbI3 PQD solar cell shows a significant increase in efficiency with suppressed hysteresis, indicating the impressive potential of this strategy for developing highly efficient PQD solar cells.
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Green Energy & Environment
·
2021
·
IF 8.207
Siying Che,Jiachen Guo,Lu Gan,Qiaoxin Xiao,Haoran Li,Yuanbin She,Congmin Wang
An interesting phenomenon was found that fluorophore was introduced into ionic liquid (IL) to magnify fluorescence signal via the thermally activated delayed fluorescence process; thus up to 15 fold enhancements were achieved. Hence, we reported a succinct enhanced luminescence strategy to reduce single-triplet energy split by the tunability of ILs. This strategy could be extended to more kinds of ILs by the virtue of a preliminary DFT calculation screening. Moreover, the optical feature of IL sensor made it a promising candidate as a gas fluorescence sensor.
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Lubrication Science
·
2017
·Vol. 30
·期 1
·16-22
·
IF 1.414
Zeyun Wang,Wei Wu
Oil-miscible phosphonium-based ionic liquids have recently been attracted much attention. This study is to develop potentional high temperature lubricating greases based on oil-miscible phosphonium-based ionic liquids. This lubricating grease is prepared using oil-IL blend, which was obtained by adding 10wt% oil-miscible phosphonium-based ionic liquids into the PAO 40 base oil as base stock. Compared with the traditional PAO 40 polyurea grease, this polyurea grease has a little lower dropping point. Corrosion test results show the polyurea grease that was prepared using phosphonium-based ionic liquids cations connected with longer alkyl chains that are no corrosion to brass and steel. Most importantly, the polyurea greases demonstrate very promising tribological properties at 150°C, such as low friction coefficient, small wear volume, and high lubrication failure load. Surface characterization revealed the tribochemical film containing iron oxide, and Fe[PO 4 ] was formed on the worn surface.
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SEPARATION AND PURIFICATION TECHNOLOGY
·
2024
·
IF 8.1
Yu Wang,Ruoyu Hu,Wenli Liu,Zhaoyou Zhu,Yinglong Wang,Jingwei Yang,Jianguang Qi,Peizhe Cui
In the process of producing low-carbon alcohols from coal, azeotropic waste containing ethanol and n-hexane is generated. To prevent environmental risks and resource waste from solvent loss, this study selected green solvent ionic liquids (ILs) for their separation. First, we screened five anions with high selectivity based on the conductor-like screening model for realistic solvents (COSMO-RS), and through various quantum chemical calculations, we found that the anions play a significant role in the separation of the two components, with [HSO 4 ] − showing the best separation performance. Second, we predicted the phase equilibrium data for ILs containing [HSO 4 ] − in the azeotropic system, considering practical factors such as price and viscosity, and selected [EMIM][HSO 4 ], [BMIM][HSO 4 ], and [HMIM][HSO 4 ] for experiments. The results indicated that simpler cation side chains enhance the separation capability of the system. Then, a toxicity analysis of the ILs ensured their biocompatibility and feasibility. Finally, we established the extraction distillation process and visualized the interactions between the ILs and the azeotropic system through molecular dynamics simulations. This work provides theoretical guidance for the separation of alcohols and alkanes in the industry.
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Carbon Capture Science & Technology
·
2023
·
IF 0
Liu Yang,Jiawei Chen,Ning Ma,Xinling Li,Zhen Huang
Nonaqueous biphasic absorbent decreasing the regeneration heat consumption by phase separation (lean-phase and rich-phase) and water evaporation elimination is a promising CO 2 capture absorbent, but the low CO 2 loading capacities are of great challenges. In this study, ionic liquids (IL) were proposed as catalysts for enhancing the CO 2 loading in monoethanolamine (MEA)-1-Butanol nonaqueous biphasic absorbents. Three types of fluorinated IL including 1‑butyl‑3-methylimidazolium tetrafluoroborate ([B mim ][BF 4 ]), 1‑butyl‑3-methylimidazolium hexafluorophosphate ([B mim ][PF 6 ]), and 1‑butyl‑3-methylimidazolium bis[( trifluoromethyl ) sulfonyl ]imide ([B mim ][TF 2 N]) under different concentrations (0–10wt%) were detailly analyzed to explore the catalyzation of IL on phase separation behavior and absorption performance. Phase separation study showed that the MEA-1-Butanol-IL system exhibited the wonderful phase separation behavior with a volume ratio (rich-phase) between 30 and 40 %. Three phases were observed in MEA-1-Butanol-[B mim ][BF 4 ] and MEA-1-Butanol-[B mim ][PF 6 ] systems after CO 2 absorption and the components of each phase were identified by 13 C nuclear magnetic resonance (NMR) spectroscopy. In absorption study, the absorption enhancement of IL was in this order: [Bmim][TF 2 N] > [Bmim][BF 4 ] > [Bmim][PF 6 ]. MEA-1-Butanol-10wt% [Bmim][TF 2 N] system could improve 35.9 % CO 2 loading and 24.2 % absorption rate compared to basic MEA-1-Butanol. A molecular scale understanding of the three-steps reaction mechanism of MEA-1-Butanol-IL absorbing CO 2 was revealed, and the different catalyzation of three types of IL can be attributed to the different affinity for CO 2 . This study provides new insights into designing nonaqueous biphasic solvents and a promising MEA-1-Butanol-IL system with high CO 2 capture performance.
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DOI
Journal of Materials Chemistry A
·
2022
·Vol. 10
·期 38
·20545-20551
·
IF 14.511
Canfu Zhang,Binbin Chen,Ziyang Cai,Fenglin Zhang,Renzhi Huang,Mengdie Yan,Yingchun Liu,Huilin Pan
The state-of-the-art water-in-salt electrolytes exhibit a wider electrochemical window than conventional dilute aqueous electrolytes. However, the extended electrochemical stability window via increasing the salt concentration has reached a bottleneck. An alternative approach is to effectively suppress H2O activity using multi-functional components. Here, we design an isolated water-in-salt solvation structure in aqueous electrolytes with the “hydrotropic” ionic liquid 1-methyl-1-propylpiperidinium bis(fluorosulfonyl)imide (PP13FSI). The addition of PP13FSI suppresses H2O clusters via the hydrophobic PP13+ cations and lithium-philic FSI− anions, showing a greatly extended electrochemical stability window up to 4.9 V. A robust alkaline-based organic–inorganic hybrid solid electrolyte interface is achieved on a low-voltage Li4Ti5O12 anode, which further extends kinetics stability of aqueous electrolytes. Aqueous Li4Ti5O12‖LiMn2O4 full cells demonstrate stable cycling over 1000 cycles at 2C rate and a capacity retention of 70% with an average coulombic efficiency of 99.7%. This work provides new avenues to explore effective approaches for the development of next-generation highly stable aqueous lithium-ion batteries.
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CATALYSIS LETTERS
·
2021
·Vol. 152
·期 3
·781-790
·
IF 3.186
Yao Jie,Sheng Mengdi,Bai Shiyang,Su Hongjing,Shang Hui,Deng Han,Sun Jihong
Three mesoporous silica materials (MCM-41, MSN and BMMs) possessing different morphologies but similar hexagonal arranged mesopores with almost the same pore size (2–3 nm) were functionalized by Zn and [1-(trimethoxysilyl)propyl-3-methylimidazolium] ionic liquid (ILs) via post-grafting treatment. The ILs grafted mesoporous silicas were then characterized by porosity, microscopy and SAXS techniques, and the successful loading of Zn and ILs, as well as the different distribution of functional groups in different supports were shown. Furthermore, the cycloaddition reaction of CO 2 with epoxide was employed to evaluate the influences of the ILs distribution, which was proved to be caused mainly by varying morphologies of different supports. All the catalysts showed good catalytic activities. Interestingly, at low temperature, the inter particle supported ILs in BMMs had the highest catalytic efficiency, while the aggregation grafting ILs on MCM-41 present the lowest activity. However, the mesoporous silicas with ordered arranged nanopores present the superiority at higher temperature. The results highlight the crucial role played by the morphology of the supports. Graphical abstract
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AICHE JOURNAL
·
2022
·Vol. 68
·期 8
·e17711
·
IF 4.167
Yingying Cao,Xin Tan,Guoxiong Zhan,Qiongguang Li,Hui Wang,Zengxi Li
One of the challenges to obtain high-quality natural active substances is the selective separation of the target compound from its analogues. In this study, ionic liquids (ILs), with design flexibility, were proposed to separate artemisitene and artemisinin, typical examples of natural analogues. Based on COSMO-RS calculation, several ILs were selected to separate artemisitene/artemisinin by experiment. It was demonstrated that the aqueous solution of N -allyl- N,N,N -trimethylammonium chloride ([AA][Cl]) exhibited excellent capability for selective separation of the two compounds. Under the optimal conditions (40°C, 1 h), the separation selectivity of artemisitene/artemisinin could reach 12.23 when the initial impurity content was only 0.8 wt%. Spectroscopic analysis and molecular dynamics indicated that π – π complexation between artemisitene and [AA][Cl] plays a major role in this separation process. Moreover, the process of multistage cross-flow extraction was compared with counter-flow extraction, and the latter one exhibited advantages in energy consumption and product yield.
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Green Chemical Engineering
·
2021
·
IF 0
Yunchang Fan,Di Wu,Sheli Zhang,Lei Zhang,Wei Hu,Chunyan Zhu,Xueyun Gong
The hydrophobic ionic liquids/water two-phase system was developed to prepare CuO nano particles. The catalytic activity of the synthesized CuO was investigated by photodegradation of 4-nitrophenol (4-NP) in the presence of H 2 O 2 under visible light irradiation. The optical properties of the synthesized CuO were characterized by ultraviolet–visible (UV–Vis) diffuse reflectance spectroscopy (DRS). Experimental results indicated that the band gap energy ( E g ), conduction band edge potential ( E CB ) and valence band edge potential ( E VB ) of the synthesized CuO were 1.37 eV, 0.625 eV and 1.995 eV, respectively. A degradation efficiency of 4-NP (4.8 mmol L −1 ) as high as 95.3% could be achieved under the conditions of pH 6.0, 0.48 g L −1 of CuO dosage, 1.4% of H 2 O 2 dosage and 90 min of degradation time. The synthesized CuO exhibited poor catalytic activity under alkaline conditions due to the disassociation of 4-NP, which elevated the repulsion between CuO and the 4-NP anions. The synthesized CuO nano particles exhibited higher catalytic activity compared with the catalysts reported in literature. Furthermore, the synthesized CuO nano particles could be reused at least six times without decreasing their catalytic activity. Compared with the traditional hydrothermal method, mild operating conditions and time saving are the advantages of the developed method for the preparation of CuO.
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COLLOIDS AND SURFACES A-PHYSICOCHEMICAL AND ENGINEERING ASPECTS
·
2013
·
IF 2.108
Zhiping Du,Enze Li,Yang Cao,Xiang Li,Guoyong Wang
The aggregation behavior of two trisiloxane-tailed surface active ionic liquids (ILs), 1-methyl-3- trisiloxaneimidazolium chloride ([Si(3)Mim]Cl) and trisiloxanepyridinium chloride ([Si(3)Py]Cl), in aqueous solution was investigated by the measurement of surface tension, electrical conductivity, transmission electron microscopy (TEM), dynamic light scattering (DLS), and X-ray diffraction (XRD). The surface tension measurement showed the critical aggregation concentration (cac) of [Si(3)Mim]Cl and [Si(3)Py]Cl is 15.5 and 24.8 mmol l −1 respectively, and the corresponding surface tension at cac ( γ cac ) is 23.8 and 23.0 mN m −1 , respectively. The phenomenon was mainly ascribed to the branched trisiloxane hydrophobic moieties and these results demonstrated that the surface activity of these trisiloxane-tailed ILs was somewhat superior to that of conventional ILs. The vesicular-like structure of the aggregates was observed by TEM while DLS provided the diameter distribution of these aggregates. In addition, a probable two-layered arrangement of molecules in aggregates for the two ILs in aqueous solution was proposed based upon the results of XRD studies. This investigation may contribute to expand understanding of trisiloxane-tailed ILs. Furthermore, high thermal stability of such compounds may improve their potential applications in the fields of colloids and interfaces science.
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ACS Omega
·
2025
·
IF 4.3
Jiaxin Cui,Mengfan Yin,Tao Zheng,Han Liu,Rui Zhang,Haiyan Liu,Zhichang Liu,Chunming Xu,Xianghai Meng
The separation of olefins and alkanes is beneficial for resource utilization of oil products, and liquid–liquid extraction is an important method of liquid-phase olefin/alkane separation. This study investigated the feasibility of bimetallic ionic liquids for the extraction of olefin from liquid-phase olefin/alkane mixtures using 1-hexene/n-hexane as a model hydrocarbon mixture. The bimetallic ionic liquids were first synthesized from different metal chlorides (ZnCl2, SnCl2, AlCl3, FeCl3) and CuCl with triethylamine hydrochloride. This newly prepared Fe–Cu bimetallic ionic liquid [Et3NH]Cl–0.47FeCl3-0.8CuCl had a good extraction performance, and the extraction selectivity could reach up to 8.41, which was about 4 times that of the organic solvent such as N-formylmorpholine and γ-butyrolactone used in the industry. The liquid–liquid equilibrium (LLE) of 1-hexene/n-hexane and Fe–Cu bimetallic ionic liquid system was investigated under different extraction temperatures, extraction times, and mass ratios of extractant to feed. Through 5 recycling experiments, the extraction selectivity decreased by less than 2%, and the characteristic peaks of the recovered bimetallic ionic liquids were unchanged by IR analysis, which proved that the bimetallic ionic liquid had excellent reversibility. Furthermore, the mechanism of 1-hexene extraction was investigated by quantum chemistry calculation and Raman spectroscopy, and there was π-complexation between Cu+ and 1-hexene. Then, the charge density of Cu+ in bimetallic ionic liquids was larger than that of cuprous-based ionic liquids. The results revealed that the addition of FeCl3 could activate Cu+ and weaken the Cu–Cl bond, enhancing the ability of the bimetallic ionic liquid to extract 1-hexene. Therefore, [Et3NH]Cl–0.47FeCl3-0.8CuCl was a good potential extractant during the efficient extraction of 1-hexene.
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