Analytical Methods
·
2014
·Vol. 7
·期 1
·218-225
·
IF 1.938
Junxiao Qin,Ligai Bai,Jiafei Wang,Yamin Ma,Haiyan Liu,Shuai He,Tengteng Li,Ying An
A novel skeleton porous polymer-based monolith chromatography column has successfully been prepared using an in situ free radical polymerization technique. A 50 mm × 4.6 mm i.d. stainless steel chromatographic column used dodecanol as porogen and ionic liquid (IL), 1-dodecene (C12) and trimethylol propane triacrylate (TMPTA) as monomers, and ethylene dimethacrylate as crosslinker. The effect of variables such as temperature and porogen solvent content on the porous structure was studied in detail. The polymer-based monolith obtained was characterized by scanning electron microscopy, infrared spectroscopy, mercury intrusion porosimetry, and nitrogen adsorption. The results indicated that the monolithic column had a porous structure, good mechanical stability, high permeability (6.77 × 10−14 m2), and a high specific surface area (155.62 m2 g−1). The liquid chromatographic performance of the monolith was evaluated in the separation of lysozyme from egg white and in the separation of a variety of mixtures of small molecules, such as amines and benzene analogues. The column showed good repeatability and reproducibility, and the column-to-column (n = 7) and batch-to-batch (n = 5) reproducibility was 2.85 and 3.15%, respectively.
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TALANTA
·
2021
·
IF 6.057
Tong Chen,Xue Yang,Shuya Wang,Guangsan Song,Hongbin Zhou,Weijian Shen,Ling Gao
In order to solve the problems of using a large proportion of acetonitrile on the hydrophilic interaction liquid chromatography (HILIC) columns that was not environmentally friendly, and the poor acid and base resistance of traditional bonded silica columns, we reported a novel stationary phase of Au nanoparticles (Au NPs) covalently bonded to ionic liquid (ILs) bridged periodic mesoporous organosilicas (PMO) hydrophilic microspheres (PMO-ILs-Au NPs) for per aqueous liquid chromatography (PALC). The PMO hydrophilic microspheres were prepared by condensation of 1,3-bis(trimethoxysilylpropyl)imidazoliumchloride and 1, 2-Bis (triethoxysilyl) ethane and then modified with Au NPs the surface. The obtained materials were characterized by elemental analysis , FT-IR spectra, scanning electron microscope and transmission electron microscopy . The retention behavior was evaluated by investigating the effect of various chromatographic factors on the retention of different types of solutes. The retention mechanism of the stationary phases in PALC was a mixed type of anion-exchange and hydrophobic interaction. Compared with C 18 –SiO 2 column, the acid and base resistance of the stationary phase were greatly improved. Compared with the HILIC column and C 18 column, some hydrophilic compounds such as six organic acids and eight biogenic amines were baseline separated with the enhanced resolution of the PMO-ILs-Au NPs column under the PALC mode. The efficiency of the new column was significantly higher than that of the HILIC column. Furthermore, the analysis of PALC-triple quadrupole mass spectrometry was developed for simultaneous detection of eight biogenic amines. This method could improve detection efficiency, save reagent and reduce environmental pollution. PALC as a green chromatography analytical method was suitable for the replacement of HILIC.
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PubMed
高影响因子
COLLOID AND POLYMER SCIENCE
·
2023
·Vol. 301
·期 12
·1421-1436
·
IF 2.4
Shen Yiyue,Li Fahui,Deng Yupei,Chen Haoyuan,Zhang Jingchun,Wang Qiqi,Zhuang Linghua,Wang Guowei
Ionic liquid surfactant (ILS) shows potential application in surfactant foam enhancing oil recovery (SFEOR). The structure–activity relationship between structural characteristics and foam feature is vital for the design and selection of favorable ILS for SFEOR. In this paper, the effect of structural substituent groups of anionic ILSs on foam features was established from experimental methods and Density functional theory (DFT) simulations. Physicochemical features of two anionic ILSs, 3-butyl-1-ethoxycarbonylimidazolium dodecyl benzene sulfonate ([Etbim][DBS]) and 1-butyl-3-butylcarbonylimidazolium dodecyl benzene sulfonate ([Btbim][DBS]) was determined. By surface tensiometry, the critical micelle concentration (CMC) values of [Etbim][DBS] and [Btbim][DBS] were 0.324 mmol/L and 0.211 mmol/L respectively. Foam characteristic of two ILSs were studied, whose tendency followed: [Etbim][DBS] > [Btbim][DBS]. ILS hydrates showed tendency: [Etbim][DBS] (H 2 O) n < [Btbim][DBS] (H 2 O) n . Binding energy (D 0 ) values followed the tendency: [Etbim][DBS] (H 2 O) n > [Btbim][DBS] (H 2 O) n . Experimental and DFT results verified the introduction of longer ester alkyl chain length in imidazolium cation was adverse to foam features of ILSs. This information will help to screen new foam surfactants for SFEOR.
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JOURNAL OF MOLECULAR LIQUIDS
·
2021
·
IF 6.165
Zhiwei Wang,Teng Wu,Xiao Geng,Juanjian Ru,Yixin Hua,Jiaojiao Bu,Yu Xue,Ding Wang
Nanoscale Fe Cr alloy is successfully electrodeposited in choline chloride-ethylene glycol (ChCl-EG, mole ratio 1:3) deep eutectic solvent (DES) at two-electrode system by optimizing concentration ratio c Fe(II) / c Cr(III) . ESI-MS analyses indicate [Fe(H 2 O) 3 (Cl − ) 3 ] − and [Cr(H 2 O) 2 Cl 4 ] − are the dominant species of Fe(II) and Cr(III) in ChCl-EG DES, respectively. Linear sweep voltammetry demonstrates that with the increase of c Fe(II) / c Cr(III) from 1:5 to 1:1, the reduction potential difference between Fe(II) and Cr(III) will become smaller, which is conducive to the electrodeposition of Fe Cr alloy deposit with a higher Cr content. The reduction of Fe(II) or Cr(III) on glassy carbon electrode is a quasi-reversible process controlled by diffusion with a diffusion coefficient of 5.34 × 10 −6 cm 2 ·s −1 and 2.22 × 10 −6 cm 2 ·s −1 . FE-SEM observation shows that as the c Fe(II) / c Cr(III) decreases from 1:2 to 1:5, the microstructure becomes uneven with the morphology transform from homogeneous particles to scaly blocks. At 1:2, the prepared nanocrystalline Fe Cr alloy has a symmetrical element distribution with a mean coating thickness of 120.3 μm and a mean diameter of ≈1.56 nm. Corrosion resistance test manifests the prepared Fe Cr alloy possesses good corrosion resistance. All the above studies provide a theoretical foundation for Fe Cr alloy production by varying electrolyte ratios.
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ENVIRONMENTAL SCIENCE AND POLLUTION RESEARCH
·
2021
·Vol. 28
·期 14
·17752-17762
·
IF 4.223
Xie Kangjun,Dong Zhen,Zhao Long
The decontamination of radioactive TcO 4 − from nuclear wastes is becoming increasingly crucial for spent nuclear fuel reprocessing and environmental remediation. In this work, a series of ionic liquid–immobilized silica-based adsorbents (SVIL-Cn, n = 1, 4, 8) were newly synthesized using the radiation-induced grafting of 4-vinylbenzyl chloride onto silanized silica and subsequent functionalization with 1-methylimidazole, 1-butylimidazole, or 1-octylimidazole. The synthesis conditions such as the solvent, absorbed dose, and monomer concentration were investigated in detail, and the resulting adsorbents were characterized by elemental analysis, FT-IR, SEM, and TGA. In batch experiments, the adsorbents exhibited a high ReO 4 − (a nonradioactive surrogate of TcO 4 − ) removal efficiency over a wide pH range (3 ~ 8), and SVIL-C1 showed a maximum adsorption capacity of 70.62 mg g −1 towards ReO 4 − . In addition, their adsorption performance barely changed after 800 kGy radiation. The column experiments for treating simulated radioactive wastewater showed that the SVIL-Cn adsorbents could selectively separate TcO 4 − /ReO 4 − from a variety of fission products, and they could be recycled four times with negligible capacity loss. Lastly, XPS and FT-IR analysis confirmed that the adsorption proceeded via an ion-exchange mechanism. The results showed that these adsorbents are suitable for the efficient removal of TcO 4 − /ReO 4 − from radioactive wastewater with complex compositions. Graphical abstract
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Canadian Journal of Chemistry
·
2016
·Vol. 94
·期 5
·
IF 1.003
Yingying Wu,Xuemin Chen,Yanying Wang,Chunya Li
3-Decyl-1-(3-pyrrole-propyl)imidazolium tetrafluoroborate (DPIMBF4) ionic liquid was synthesized and characterized. DPIMBF4 ionic liquid not only possesses a pyrrole group that can be electrochemically polymerized onto a glassy carbon electrode surface by using a multipotential step technique, but it also contains a long carbon chain that can improve the stability of a polymerized ionic liquid film in an aqueous solution. X-ray photoelectron spectroscopy, scanning electron microscope, and electrochemical impedance spectroscopy were used to confirm the successful polymerization of the ionic liquid. Voltammetry was employed to investigate the electrochemical behaviors of an environmental estrogen, hexestrol, at the polymerized ionic liquid film electrode. Hexestrol presents an irreversible oxidation peak at the polymerized DPIMBF4 ionic liquid film electrode. Compared with the bare glassy carbon electrode, the oxidation peak of hexestrol increased significantly on the polymerized DPIMBF4 ionic liquid film electrode. The oxidation peak current was found to be linearly related to hexestrol concentration in the range of 5.0 × 10−9 to 1.0 × 10−5 mol L−1. The detection limit was calculated to be 1.25 × 10−9 mol L−1 (S/N = 3). Hexestrol in crucian meat was determined using the polymerized DPIMBF4 ionic liquid film electrode with good accuracy.
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Journal of Materials Chemistry A
·
2018
·Vol. 7
·期 3
·1069-1075
·
IF 9.931
Shi Wang,Qinghui Zeng,Ailian Wang,Xu Liu,Jie Chen,Zhinan Wang,Liaoyun Zhang
The advantages of solid-state polymer electrolytes (SPEs) such as ease of fabrication, high safety, good compatibility with Li metals make SPEs one of the most promising electrolyte materials for next generation high-performance and high-safety lithium-ion batteries (LIBs). However, the traditionally used PEO-based electrolytes usually exhibit very low ionic conductivity due to the high crystallinity of PEO, which impedes the commercialization of solid-state LIBs using PEO-based polymer electrolytes. In this study, an ‘alternative’ solid electrolyte material was prepared using a nematic liquid crystal (LC) and an ionic liquid (IL). Specifically, the LC with ordered layered nanostructures was polymerized and immobilized via UV-irradiation, while IL was sufficiently inserted into the ordered ion channels for fast transport ions. It should be noted that such a free-standing electrolyte film with stable ordered channels has been confirmed through the characterizations of DSC, POM, SEM and XRD. As a result, the solid electrolyte film shows superior comprehensive electrochemical performance in terms of a very high room temperature ionic conductivity (2.14 × 10−2 S cm−1), wide electrochemical window (4.8 V), and very good compatibility with lithium metal. Furthermore, the LiFePO4/Li cell using the ordered electrolyte film shows an average discharge capacity of 150 mA h g−1. Undoubtedly, our study provides a new solid electrolyte material that has the potential to be used in the next generation of high safety and high energy density LIBs.
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SEPARATION AND PURIFICATION TECHNOLOGY
·
2017
·
IF 3.359
Fengli Chen,Kailin Mo,Qiang Zhang,Shimin Fei,Yuangang Zu,Lei Yang
In the present work, a simple and efficient method for steam distillation of paeonol and simultaneous extraction of paeoniflorin from the root bark of Paeonia suffruticosa Andr. (Cortex Moutan) was developed using an ionic liquid as the reaction medium and microwave irradiation. A series of 1-alkyl-3-methylimidazolium ionic liquids with different anions and alkyl chain lengths were evaluated for this method. The optimum conditions were 1.25 M 1-butyl-3-methylimidazolium bromine as the extraction solvent, 20 mL/g liquid–solid ratio, 25 min microwave irradiation time, 700 W microwave irradiation power, and 60–80 mesh particle size. Under these conditions, satisfactory yields of paeoniflorin (80.49 ± 2.58 mg/g) and paeonol (10.52 ± 0.36 mg/g) were obtained. The initial purity of paeonol was 84.95%, and this increased to >99% with simple recrystallization. The ionic liquid extraction solution, either with or without trace paeonol, was passed through HPD100B macroporous resin for enrichment and separation of paeoniflorin and recycling of the ionic liquid used. Recycling and reuse of the ionic liquid were achieved successfully, which could reduce ionic liquid requirements and the process cost. The method was validated using stability, recovery, and repeatability experiments. The proposed method is very promising for separation of natural compounds, especially for small molecules that can be isolated by steam distillation.
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高影响因子
JOURNAL OF SEPARATION SCIENCE
·
2021
·Vol. 45
·期 5
·1116-1127
·
IF 3.645
Sainan Li,Yanjie Li,Ying Wang,Ruizhe Li,Huazhou Niu,Chunming Liu,Yuchi Zhang
A simple and efficient method was developed for the rapid screening and identification of ligands for monoamine oxidase B. A new ionic-liquid-based ultrasound-assisted extraction method for medicinal herbs was also developed and validated. In addition, the hyphenated technique of countercurrent chromatography and semipreparative-LC was developed and applied to the isolation of the chemical constituents for Pueraria thomsonii Benth. Three potent monoamine oxidase B inhibitors, namely, daidzein-4′,7-diglucoside (42.2 mg), puerarin 6′′- O -xyloside (88.3 mg), and 3′-hydroxypuerarin (48.5 mg) with purities of 98.2, 96.3, and 97.1%, respectively, were obtained from 500 g of P. thomsonii raw material using semi-preparative high-performance liquid chromatography, whereas 3′-methoxypuerarin (76.2 mg), daidzein-8-C-apiosyl (1→6) glucoside (84.2 mg), and tectorigenin (75.1 mg) with purities of 98.5, 96.4, and 96.8%, respectively, were obtained from 500 g raw material via countercurrent chromatography using a two-phase solvent system comprising n -hexane–ethyl acetate–methanol–water at a volume ratio of 1.85:1.00:0.86:3.69 (v/v/v/v). Then, the anti-Alzheimer activity of the phytochemicals was assessed using a PC12 cell model. Treatment with tectorigenin, daidzein-4′,7-diglucoside, puerarin 6′′- O -xyloside, 3′-hydroxypuerarin, 3′-methoxypuerarin, and daidzein-8-C-apiosyl (1→6) glucoside (100 μg/mL), resulted in cell viabilities of 69.00, 65.81, 59.69, 57.90, 55.61, and 54.59%, respectively ( p < 0.001). The protocol was proved to be very accurate and efficient.
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高影响因子
JOURNAL OF FOOD COMPOSITION AND ANALYSIS
·
2025
·
IF 4.6
Zirong Lan,Jin Huang,Jiang Qing,Jianhua Shi,Zhou Xu,Maolong Chen,Li Wen,Yunhui Cheng,Libing Wang,Li Ding
By precisely regulating ionic liquids (ILs) as dual functional mediators (green solvents/pore structure directing agents), we have achieved synthesis of three-dimensional hierarchical porous covalent organic frameworks (3D-COF). The prepared IL@3D-COF exhibited a multiscale nanopores structure and larger specific surface area, which was used as the solid-phase microextraction (SPME) coating material for the dual-mode SPME of polycyclic aromatic hydrocarbons (PAHs) from thermal processed meats. Especially, the incorporation of ILs functional groups provided abundant active adsorption sites, while the unique hierarchical pore architecture of IL@3D-COF significantly enhanced mass transfer kinetics. Under the accelerated extraction of high mass transfer rate and multiple interactions (π-π stacking, hydrogen bonding, and hydrophobic interactions), extraction equilibrium can be achieved in just 8 min. When combined with gas chromatography tandem mass spectrometry (GC-MS/MS), the 16 PAHs in meat samples have wide linear range (0.2-500 μg kg -1 ) with low quantitative limits of 0.02-0.78 μg kg -1 . Compared with other coating materials, IL@3D-COF coating materials are not only efficient and time-saving in the extraction process, with excellent extraction effects, but also have mild synthesis conditions and are environmentally friendly. It can provide a new alternative for sensitive analysis of PAHs in thermal processed meat products.
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高影响因子
JOURNAL OF ALLOYS AND COMPOUNDS
·
2025
·
IF 6.3
Guodong Xu,Qi Xu,Yihong Liu,Yuntao Wang,Xiankun Wu,Jingtao Dai,Jianlan Liu,Dong Fang
In this work, a synergistic ionic liquid-incorporated sulfur-doped carbon nitride composite (S-C 3 N 4 /IL) was designed and synthesized via self-assembly at ambient conditions. The introduced sulfur dopants demonstrated dual functionalities: (i) mediating the interfacial compatibility between hydrophilic ionic liquids (ILs) and hydrophobic C 3 N 4 , and (ii) significantly enhancing electronic conductivity. Concurrently, the IL component was found to play critical roles in: (i) suppressing photoinduced charge recombination via enhanced electron transfer kinetics as evidenced by abundant free radicals according to electron paramagnetic resonance (EPR) spectra, and (ii) improved aqueous-phase wettability evidenced by reduced contact angles. Consequently, the S-C 3 N 4 /IL composite achieved a hydrogen evolution rate of 16.39 mmol g −1 h −1 in simulated seawater, significantly exceeding that of undoped C 3 N 4 of 0.64 mmol g −1 h −1 . This study presents a method for constructing a novel photosensitizer set for efficient photocatalytic hydrogen evolution.
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高影响因子
CHEMICAL ENGINEERING JOURNAL
·
2025
·
IF 13.2
Ruxin Duan,Xuyang Chai,Zhen Zhang,Yili Zhao,Yingzhan Li
Hydrogel-based flexible wearable devices have garnered considerable attention in recent years owing to their inherent mechanical compliance and superior sensing functionalities. Nonetheless, hydrogels confront significant challenges, such as their propensity to freeze at subzero temperatures, inadequate moisturizing capacity, and dependence on external power sources. Herein, a novel hydrogel was developed by incorporating poly(3,4-ethylenedioxythiophene): poly(styrene sulfonate) (PEDOT:PSS) and single-walled carbon nanotubes (SWCNTs) into a cellulose nanocrystal (CNC)-doped poly(vinyl alcohol) (PVA)/borax ionic hydrogel (PS@PE) within an ionic liquid (IL)/water binary solvent system. The ionic hydrogel (PS 20–2 @PE 4/6 ) maintains an excellent performance at either ultra-low temperature (−50 °C)，demonstrating superb sensing performance. Furthermore, this ionic hydrogel (PS 20–2 @PA 4/6 ) demonstrated notable stability, retaining over 80.80 % of its original mass after 60 d of storage under open-air conditions. Significantly, PS 20–2 @PE 4/6 displayed remarkable thermoelectric performance, achieving a power factor of 6.43 ± 0.06 μW·m −1 ·K −2 . With its antifreeze capability, moisture retention, and self-powered characteristics, this multifunctional ionic hydrogel holds substantial potential for applications in intelligent wearable strain-sensing devices. This multifunctional ionic hydrogel holds great promise for advancing next-generation self-powered, extreme-environment-resistant wearable devices, offering revolutionary solutions for medical monitoring, human-machine interaction, and polar/space exploration.
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高影响因子
危险品化学品经营许可证（带存储）