JOURNAL OF CHROMATOGRAPHY A
·
2020
·
IF 4.049
Qian Yuan,Meiling Qi
This work presents a new triptycene-based dicationic guanidinium ionic liquid (TPG) as the stationary phase for gas chromatography (GC). To our knowledge, this is the first example of employing a dicationic guanidinium ionic liquid (GIL) for chromatographic analyses. As a result, the TPG column exhibited moderate polarity and column efficiency of 3840 plates/m and 3120 plates/m measured by naphthalene and 1-octanol at 120 °C, respectively. Particularly, the TPG column exhibited distinctly advantageous performance for the challenging Grob test mixture and the isomer mixture of phenols and anilines over the monocationic GIL and its counterpart with dicationic immidazolium units (TP-2IL). Also, it showed higher selectivity towards the isomers of alkanes, alcohols, diethylbenzenes, bromotoluenes, bromonitrobenzenes than the commercial DB-35MS column. Moreover, the TPG column achieved improved thermal stability over the GIL column and excellent repeatability with the RSD values of 0.01–0.05% for run-to-run, 0.11–0.24% for day-to-day and 2.4–4.1% for column-to-column. Its application to GC–MS analysis of the essential oil of Mentha haplocalyx proved its good potential for analysis of complex samples.
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PubMed
高影响因子
CHEMICAL ENGINEERING JOURNAL
·
2025
·
IF 13.2
Jingna Li,Wei Zhang,Yaming Sun,Chenchen Song,Hailiang Zhao,Yangyong Lv,Yuansen Hu,Shusheng Zhang,Lijun He
Early warning detection based on aflatoxin B 1 (AFB 1 ) biosynthesis precursors is an effective strategy for the prevention of AFB 1 contamination. However, the development of effective methods for accurately tracking the dynamic changes of AFB 1 and its precursors presents a major challenge. This difficulty is due to the continual variations in precursor species and concentrations, structural differences of AFB 1 and its precursors, as well as the complexity of the dynamically changed sample matrix. Herein, an ionic liquid-impregnated covalent triazine polymer composite (IL@CTP) was fabricated, which exhibited excellent extraction performance for structurally different AFB 1 and its three typical precursors in moldy grains. The high performance was attributed to the multiple interactions between the prepared composite and analytes, as well as a mesopore filling effect. The combined use of IL@CTP with dispersive solid-phase extraction and ultra high-performance liquid chromatography-mass spectrometry achieved negligible matrix effects, with low limits of detection (0.01–0.03 ng/g), wide linearity (0.06–200 ng/g) and satisfactory relative recoveries of 85.3 %-113.0 %. Therefore, the developed method can accurately track the dynamic changes of AFB 1 and its precursors in stored maize inoculated with Aspergillus flavus . Correlation analysis between AFB 1 and its precursors showed that it was necessary to simultaneously serve averantin, O-methylsterigmatocystin and sterigmatocystin as early warning molecules, allowing the accurate identification of AFB 1 contamination risks up to 5 days in advance.
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高影响因子
Journal of Environmental Chemical Engineering
·
2025
·
IF 7.2
Yao-Yao Wang,Yu-Qing Wang,Chunfeng Wang,Yuqiao Chai,Xiaoxue Liu,Zhaoyang Wang,Hongjie Zhu,Hui-Juan Wang,Dong Wang
Bismuth-based halide perovskites are semiconductors that respond well to light and can be used in reactions triggered by visible light. However, their structure makes them unstable in wet or aqueous conditions, limiting their use in water-based reactions. This paper presents a new method to create two moisture-resistant bismuth-based perovskites, (1,3-diethylbenzimidazole) 3 Bi 2 I 9 and (1-Methyl-3-ethyl-benzimidazole) 2 (1,3-diethylbenzimidazole)Bi 2 I 9 , by using N-methylbenzimidazole and N-ethylbenzimidazole with bismuth iodide. During this process, ethanol molecules in the solvent modify the N atoms at the 3-position of the benzimidazole molecules, with the help of hydroiodic acid, to form ionic liquids. The new perovskite materials do not contain alkali metal ions or organic ammonium ions, but rather ionic liquid cations (1,3-diethylbenzolamazole) + and (1-methyl-3-ethylbenzimidazole) + , thus giving them excellent moisturizing properties. The study also improves the photocatalytic performance of these materials by making them into micron-sized sheets using the anti-solvent method. Under visible light, the materials show high efficiency in reducing Cr(VI) (95.3 % and 92.3 % for the two materials) and producing hydrogen from HI splitting (2053.59 and 1957.76 μmol g −1 h −1 ). This research not only develops a method for creating moisture-resistant perovskites with ionic liquids but also shows potential for using these materials in photocatalytic reactions in water.
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高影响因子
JOURNAL OF POWER SOURCES
·
2016
·
IF 6.333
Hui Wu,Liang Shi,Jiaheng Lei,Dan Liu,Deyu Qu,Zhizhong Xie,Xiaodi Du,Peng Yang,Xiaosong Hu,Junsheng Li,Haolin Tang
The development of efficient and durable catalyst for oxygen reduction reaction (ORR) is critical for the practical application of proton exchange membrane fuel cell (PEMFC). A novel imidazole based ionic liquid is synthesized in this study and used subsequently for the preparation of a N and S co-doped metal-free catalyst with three dimensional ordered microstructure. The catalyst prepared at 1100 °C showed improved ORR catalytic performance and stability compared to commercial Pt/C catalyst. We demonstrate that the high graphitic N content and high degree of graphitization of the synthesized catalyst is responsible for its superb ORR activity. Our results suggest that the N and S co-doped metal-free catalyst reported here is a promising alternative to traditional ORR catalyst based on noble metal. Furthermore, the current study also demonstrate that importance of morphology engineering in the development of high performance ORR catalyst.
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高影响因子
JOURNAL OF SEPARATION SCIENCE
·
2015
·Vol. 38
·期 12
·2101-2108
·
IF 2.737
Jiafei Wang,Ligai Bai,Zhen Wei,Junxiao Qin,Yamin Ma,Haiyan Liu
An ionic liquid was incorporated into the porous polymer monoliths to afford stationary phases with enhanced chromatographic performance for small molecules in reversed-phase high-performance liquid chromatography. The effect of the ionic liquid in the polymerization mixture on the performance of the monoliths was studied in detail. While monoliths without ionic liquid exhibited poor resolution and low efficiency, the addition of ionic liquid to the polymerization mixture provides highly increased resolution and high efficiency. The chromatographic performances of the monoliths were demonstrated by the separations of various small molecules including aromatic hydrocarbons, isomers, and homologues using a binary polar mobile phase. The present column efficiency reached 27 000 plates/m, which showed that the ionic liquid monoliths are alternative stationary phases in the separation of small molecules by high-performance liquid chromatography
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高影响因子
Journal of Materials Chemistry A
·
2013
·Vol. 1
·期 43
·13454-13461
·
IF 0
X. Ge,C. D. Gu,Y. Lu,X. L. Wang,J. P. Tu
A versatile ionothermal strategy is proposed to synthesize nanostructured nickel compounds as energy storage materials, such as Ni(NH3)6Cl2 crystals, nanosheet-like NiCl2, nanoflower-like (NF) α-Ni(OH)2, and mesoporous NF-NiO. The primal solution is a choline chloride (ChCl)–urea mixture-based ionic liquid with nickel chloride hexahydrate (NiCl2·6H2O) dissolved. The proposed ionothermal protocol is attractive and environmental friendly because ChCl and urea are naturally biocompatible compounds. It has been reported that Ni(NH3)6Cl2 is an indirect and reversible hydrogen storage material for fuel cells. Herein, we demonstrate that Ni(NH3)6Cl2 crystals with octahedral geometry and an open structure can be obtained by maintaining the primal solution in a sealed vessel at 150 °C for 4 hours. A kinetic-to-dynamic growth mechanism is proposed to elucidate the formation of the interesting Ni(NH3)6Cl2 structure. Further annealing of the Ni(NH3)6Cl2 crystals at 300 °C produces sheet-like NiCl2, which can be utilized as an active material in sodium-ion batteries. Interestingly, with the addition of a small amount of water into the primal solution which has been kept at 150 °C and open to the air for 40 minutes, NF α-Ni(OH)2 can be obtained. Further annealing of the NF α-Ni(OH)2 at 300 °C leads to the formation of NF-NiO with a mesoporous structure, which is demonstrated to be a promising pseudo-capacitive electrode material in a KOH aqueous solution. The rapid activation process, good cycling performance, and high specific capacitance of the NF-NiO electrode are attributed to its high surface area (72.9 m2 g−1) and the mesoporous structure. We expect that the ionothermal method will have implications for the use of ChCl–urea mixture-based ionic liquids in the large-scale synthesis of advanced functional materials.
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DOI
TALANTA
·
2018
·
IF 4.244
Yuehua Chen,Huiyong Wang,Yuanchao Pei,Jianji Wang
It is significant to develop sustainable strategies for the selective separation of rare earth from transition metals from fundamental and practical viewpoint. In this work, an environmentally friendly solvent extraction approach has been developed to selectively separate neodymium (III) from cobalt (II) and nickel (II) by using an ionic liquid-based aqueous two phase system (IL-ATPS). For this purpose, a hydrophilic ionic liquid (IL) tetrabutylphosphonate nitrate ([P 4444 ][NO 3 ]) was prepared and used for the formation of an ATPS with NaNO 3 . Binodal curves of the ATPSs have been determined for the design of extraction process. The extraction parameters such as contact time, aqueous phase pH, content of phase-formation components of NaNO 3 and the ionic liquid have been investigated systematically. It is shown that under optimal conditions, the extraction efficiency of neodymium (III) is as high as 99.7%, and neodymium (III) can be selectively separated from cobalt (II) and nickel (II) with a separation factor of 10 3 . After extraction, neodymium (III) can be stripped from the IL-rich phase by using dilute aqueous sodium oxalate, and the ILs can be quantitatively recovered and reused in the next extraction process. Since [P 4444 ][NO 3 ] works as one of the components of the ATPS and the extractant for the neodymium, no organic diluent, extra etractant and fluorinated ILs are used in the separation process. Thus, the strategy described here shows potential in green separation of neodymium from cobalt and nickel by using simple IL-based aqueous two-phase system.
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高影响因子
ACS Applied Materials & Interfaces
·
2019
·
IF 8.456
Guanghai Chen,Ying Bai,Yongsheng Gao,Zhaohua Wang,Kun Zhang,Qiao Ni,Feng Wu,Huajie Xu,Chuan Wu
All-solid-state sodium ion batteries (ASIBs) possess enhanced safety and desired cycling life compared with conventional liquid sodium batteries, showing great potential in large-scale energy storage systems. Polymer electrolytes based on poly(ethylene oxide) (PEO) have been extensively studied for ASIBs due to superior flexibility and processability. However, PEO–based electrolyte without any modification can hardly meet the requirements of ASIBs at room temperature. In the past decade, unremitting efforts have been attached to inhibiting crystallization of PEO, especially via ionic liquid plasticizing. However, the plasticizing mechanism is not clear. Here we incorporated Pyr13FSI into PEO–NaClO4 electrolyte to investigate the plasticizing effect by infrared spectrum characterizations and DFT calculations. The results indicate that FSI– anions tend to adhere to the PEO backbone, generating enhanced coordination ability and more coordination sites. Solid-state sodium ion batteries using PEO–NaClO4–40 wt % Pyr13FSI as polymer electrolyte exhibit good cycling and rate performance. Insights into the plasticizing mechanism contribute to fabricating polymer electrolyte with high performance for ASIBs.
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高影响因子
Small Methods
·
2021
·Vol. 5
·期 7
·2100262
·
IF 14.188
Fanglin Xu,Shungui Deng,Qingya Guo,Dong Zhou,Xiayin Yao
Poly(vinylidene fluoride)-based polymer electrolytes are being intensely investigated for solid-state lithium metal batteries. However, phase separation and porous structures are still pronounced issues in traditional preparing procedure. Herein, a bottom-to-up strategy is employed to design single-phase and densified polymer electrolytes via incorporating quasi-ionic liquid with poly(vinylidene fluoride- co -hexafluoropropylene). Due to strong ion/dipole–dipole interaction, the optimized polymer electrolyte delivers high room-temperature ionic conductivity of 1.55 × 10 −3 S cm −1 , superior thermal and oxidation stability of 4.97 V, excellent stretchability of over 1500% and toughness of 43 MJ cm −3 as well as desirable self-extinguishing ability. Furthermore, the superb compatibility toward Li anode enables over 3000 h cycling of Li plating/stripping and ≈98% Coulombic efficiency in Li||Cu test at 0.1 mA cm −2 . In particular, lithium metal battery Li||LiNi 0.6 Co 0.2 Mn 0.2 O 2 exhibits a room-temperature discharge retention rate of 96% after 500 cycles under a rate of 0.1 C, which is associated with the rigid-flexible coupling electrodes/electrolytes interphase. This investigation demonstrates the potential application of quasi-ionic liquid/polymer electrolytes in safe lithium metal batteries.
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高影响因子
Green Energy & Environment
·
2020
·Vol. 5
·期 2
·154-165
·
IF 6.395
Siying Chong,Tongtong Wang,Haijun Zhong,Lingfei Xu,Hailong Xu,Zhongwu Lv,Min Ji
A bifunctional heterogeneous catalyst was designed and synthesized, denoted DMEDA/IL–NH 2 -MIL-101. The structure and physical-chemical characterization of DMEDA/IL–NH 2 -MIL-101 and its precursors were characterized by SEM, N 2 adsorption-desorption, XPS, FT-IR, PXRD, elemental analysis, and TGA techniques. The date showed that the two catalytic components of N, N-dimethylethylenediamine (DMEDA) and 1-butyl-3-methylimidazolium bromide (BmimBr) were chemically immobilized in NH 2 -MIL-101 nanocages. The amine of DMEDA was grafted onto carrier NH 2 -MIL-101 by N–Cr coordinate covalent bonds and the ionic liquid of BmimBr (IL (Br − )) was anchored in the NH 2 -MIL-101 nanocages by ‘ship-in-a-bottle’ method, in which the amidogen of NH 2 -MIL-101 condensed with N, N-carbonyldiimidazole (CDI) firstly, and then alkylated with 1-bromo butane. This novel heterogeneous catalyst with two different active sites can efficiently catalyze the synthesis of N-aryl oxazolidin-2-ones from carbon dioxide (CO 2 ), epoxides, and anilines in one-pot under mild solvent-free conditions. It not only showed good stability and recoverability after five cycles but also exhibited shape selectivity for the substrate due to the synergic catalysis of amine, ionic liquid, and NH 2 -MIL-101. This novel bifunctional material is a promising solid catalyst for the green synthesis of N-aryl oxazolidin-2-ones.
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高影响因子
IONICS
·
2018
·Vol. 25
·期 2
·475-482
·
IF 2.347
Xiao Mingjun,Meng Yanshuang,Duan Chaoyu,Hu Qianru,Li Ruinian,Zhu Fuliang,Zhang Yue
In this work, the Co 3 O 4 /nitrogen-doped carbon (Co 3 O 4 /NDC) composite was prepared by in situ solvothermal method using ionic liquid as carbon and nitrogen sources. The Co 3 O 4 /NDC composite was characterized by X-ray diffraction (XRD), high-resolution transmission electron microscopy (HRTEM), and electrochemical testing. The HRTEM results show that there is a thin layer of amorphous carbon film on the surface of Co 3 O 4 particles, which can improve the conductivity of Co 3 O 4 and inhibit the fragmentation of material caused by volume expansion. When the Co 3 O 4 /NDC composite is used as the anode material of lithium-ion batteries, the reversible capacity is 1056 mAh g −1 after 50 cycles at 0.1 C. The superior electrochemical performance can be attributed to the synergistic effect of amorphous carbon film, nitrogen doping, and Co 3 O 4 particles.
研究领域:
材料科学
·
电化学
·
储能
·
纳米复合材料
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高影响因子
JOURNAL OF BIOTECHNOLOGY
·
2026
·
IF 4
Renmin Liu,Tiantian Jia,Hanbing Song,Zhenhui Yu,Chaoqi Lin,Qingchun Yang,Ziyuan Ye,Yaqi Wang,Yanwen Wang,Hongbo Suo
L -histidine ionic liquid modified magnetic COF was successfully fabricated. • Covalent modification of supports with IL optimized the enzyme microenvironment. • Introduction of IL enhanced the activity and stability of immobilized lipase. • IL boosted lipase-substrate affinity and catalytic efficiency. • Magnetic responsiveness improved the separation efficiency of immobilized lipase. This study proposes an innovative immobilized lipase construction strategy to address the low activity and poor stability limitations of current biocatalysts for flavor ester synthesis. L -histidine-based ionic liquid (IL) is covalently grafted onto the surface of magnetic covalent organic framework (COF) via Schiff base reaction, and porcine pancreatic lipase (PPL) is further covalently immobilized on the composite carrier through amide bond coupling. The resulting Fe₃O₄@COF-IL-PPL shows 1.6-fold higher catalytic activity and 2.3-fold better thermal stability than free PPL, and 32% higher activity retention after cycles than PPL immobilized on IL-free COF carrier. Its optimal reaction pH and temperature are 7.5 and 50 °C respectively, maintaining 86% of initial activity at 60 °C and 76% activity after 6 h incubation at 50 °C. Under n-hexane reaction system, the isoamyl acetate yield reaches 87.4% under optimal conditions, and the biocatalyst retains 71.4% activity after 10 consecutive isoamyl acetate synthesis cycles. Although the additional preparation steps and higher cost of the support need to be considered for industrial applications, the improved catalytic performance of Fe 3 O 4 @COF-IL-PPL verified the effectiveness of IL surface modification strategy, and the system can be further extended to solvent-free systems to verify its broader applicability.
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高影响因子
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