MICROCHIMICA ACTA
·
2020
·Vol. 187
·期 3
·1-8
·
IF 6.232
Sun Xiaodong,Chen Cheng,Li Xiaoqi,Du Yingxiang,Zhao Shiyuan,Feng Zijie
A new bilayer chiral stationary phase for use in open tubular capillary electrochromatography (OT-CEC) system is described. Gold nanoparticles were modified with L-cysteine, with a tetramethylammonium lactobionate ionic liquid that acts as the chiral selector. The gold nanoparticle-coated column provides good enantioseparation and favorable reproducibility. Compared with an uncoated separation system, the column developed displays improved separation of the racemic β-blockers propranolol, esmolol, bisoprolol and sotalol (resolutions of enotiomers are 6.29, 6.11, 6.12 and 6.02, respectively). The materials and coatings were characterized by scanning electron microscopy and transmission electron microscopy. The main driving forces (CEC and electro-osmotic flow) were studied to evaluate the variation of the immobilized columns. The effects of buffer pH value, concentration of chiral selector, type of organic modifier and applied voltage were optimized. Satisfactory relative standard deviations were achieved in run-to-run, day-to-day and column-to-column experiments.
Schematic preparation of a capillary column with bilayer chiral selectors coated gold nanoparticles. This novel OT-CEC system was applied for separation of four basic racemic β-blockers.
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MICROCHEMICAL JOURNAL
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2021
·
IF 4.821
Xiaojun Dai,Yanfei Wu,Zhuanhong Jia,Chunmiao Bo
In this study, a magnetic molecularly imprinted polymer (MMIP) with a well-defined core-shell nanostructure for extracting fluoroquinolones (FQs) using heptakis (β-cyclodextrin-ionic liquid) (ILs(2)-βCD), ofloxacin (OFL), triallyl cyanate (TAC), and azobisisobutyronitrile as the functional monomer, template molecule, crosslinking agent, and initiator, respectively, has been directly fabricated in water-containing systems. The morphology, structure, and magnetic properties of the MMIP were characterized using transmission electron microscopy (TEM), Fourier transform infrared spectroscopy (FT-IR), X-ray diffraction (XRD), and vibrating sample magnetometry (VSM). Recombination experiments and competitive adsorption experiments showed that the imprinted material, MMIP, has a good binding capacity (35.85 mg/g), special selectivity, and excellent ability to eliminate matrix interference. Its molecular recognition mechanisms were investigated by the experimental validation with ultra-violet spectroscopy (UV) and proton nuclear magnetic resonance ( 1 HNMR), which inferred that hydrophobic and electrostatic interactions are the driving forces for the selective recognition of MMIP. By coupling the MMIP adsorbent with high-performance liquid chromatography, an approach was established to enhance the selective recognition of four structurally similar FQ compounds in real water samples. Several main factors affecting extraction efficiency, such as the sample solution pH value, MMIP dosage, and elution solvent type, were preliminarily optimized. Under the optimal conditions, the method has a good linear relationship (R 2 greater than 0.9990) over a wide range (0.5–1000 μg/L). The recoveries of the four FQs ranged from 80.11% to 106.71%, and the limits of detection were between 0.43 and 1.83 μg/L. The results show that this water-compatible molecularly imprinted polymer has broad application prospects for efficient identification and separation as well as enrichment of trace FQs in complex matrices.
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ENERGY & FUELS
·
2021
·
IF 3.605
Ruiqin Gao,Mengfei Yu,Hui Xu,Lichun Li,Meng Deng,Yuxue Wu,Zhengfei Chen
Two-dimensional Ti2(PO4)2F nanosheets were synthesized with an ionic liquid (IL) containing PF6 ([Bmim]PF6) via a hydrothermal method. In comparison, only anatase titanium dioxide (TiO2) nanoparticles were obtained when changing the type of anion ([Bmim]Br or [Bmim]BF4) under the same conditions, suggesting that the anion type could greatly affect the crystalline phase, particle size, specific surface, and morphology of the final products; two-dimensional nanosheets were obtained in [Bmim]PF6, whereas nanocrystals with a relatively large surface were formed in the latter two ILs, as revealed by X-ray diffraction, nitrogen gas sorption, scanning electron microscopy, and transmission electron microscopy measurements. 1H and 19F nuclear magnetic resonance examinations of the fresh and recycled ILs suggest that the IL with the PF6 anion experienced complete hydrolysis, which could be the key factor for the formation of such unique Ti2(PO4)2F nanosheets. The electrochemical performances of such Ti2(PO4)2F nanosheets were evaluated as anode materials in lithium-ion batteries (LIBs) in comparison to TiO2 nanomaterials. The rate capability and cycling performance of the Ti2(PO4)2F electrode outperformed the other two electrodes studied, as illustrated by cyclic voltammetry curves, charge/discharge behavior, and long cycling test, which is mainly due its unique layered structure and low surface area, which resulted in low volume change. The Ti2(PO4)2F electrode derived from [Bmim]PF6 displays a steady reversible capacity of 170 mAh/g and high cycling stability with over 70% capacity retention after 100 cycles. The synthesis of the controllable crystalline phase and morphology of Ti2(PO4)2F nanomaterials with such ILs paves a useful route to prepare such alternative anode materials for LIBs.
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JOURNAL OF COLLOID AND INTERFACE SCIENCE
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2021
·
IF 8.128
Shizhu Song,Qi Li,Lifang Zhang,Yanqing Wang,Xiaojuan Liu
Here, N -doped hollow carbon sphere (NHCS)-supported (1 1 1)-plane-engineered sub-5-nm Pt (Pt-NHCS) catalysts regulated precisely by imidazolium ionic liquids were synthesized successfully and used to catalyze oxygen reduction. The (1 1 1)-plane engineered Pt nanocrystals with a diameter of 4.5 ± 0.5 nm were homogeneously deposited on the 3-dimensional spherical nanoshells. The resulting Pt nanocrystals anchored on the carbon skeleton exhibit a stable configuration in both alkaline and acid electrolytes with the help of imidazolium cations and pyrolysis. Among all as-prepared catalysts, the optimized Pt-NHCS shows remarkable long-term durability. Specifically, Pt-NHCS maintains 95.3% of the original current density after 10,000 potential cycles, while Pt/C benchmarks exhibit a retention of 78.5%. Accelerated durability test results indicate that Pt-NHCS exhibits a high efficiency of 96 % in comparison with initial current density, while a value of 86% for Pt/C. Density functional theory calculations demonstrate that reactive Pt(1 1 1) planes with well-defined Schottky defects and vacancies adsorb and activate oxygen molecule rapidly while desorbing the reaction intermediates.
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ANALYTICAL AND BIOANALYTICAL CHEMISTRY
·
2019
·Vol. 411
·期 10
·2209-2221
·
IF 3.286
Zhang Yinchenxi,Duan Yixiang
A solid-phase microextraction (SPME) fiber based on a new polymeric ionic liquid was prepared for the extraction of trace aromatic amines in water and their detection by gas chromatography–mass spectrometry (GC–MS). The newly designed polymeric ionic liquid with two functional groups (benzene ring and ether group) was synthesized and fixed on stainless steel wire to effectively extract aromatic amines. Parameters that affect the extraction efficiency of the SPME fiber (extraction temperature, extraction time, alkali concentration, and salt concentration) were optimized to establish a headspace SPME–GC–MS method. The correlation coefficients were 0.996 or greater for concentration of the aromatic amines ranging from 0.01 to 10 μg mL -1 . In addition, the limits of detection for the new fiber are as low as 0.67 ng mL -1 , which is lower than that obtained with polyacrylate. The relative standard deviations of five consecutive extractions for the solution spiked at 1 μg mL -1 by the same fiber were all below 8.3%, and the interfiber relative standard deviations for the solution spiked at the same concentration ranged from 8.9% to 15.2%. Furthermore, long lifetime and good solvent resistance are exhibited by the fiber. Finally, satisfactory relative recovery in the range from 85.3% to 101.9 % was achieved for two environmental water samples.
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Journal of Cleaner Production
·
2018
·
IF 5.651
Haixia Lyu,Yunxiafei Ling,Jingshuang Fan,Yiqiong Chen,Yan Yu,Zenghong Xie
A novel 1-propylene-3-methylimidazolium chloride ([AMIM]Cl) ionic liquid-functionalized Mg/Al layered double hydroxide (IL-LDH) was synthesized via a thiol-ene click reaction and applied to adsorb Congo Red (CR) from aqueous solution. The structure of the prepared adsorbent was characterized mainly using X-ray diffraction (XRD), infrared spectrum (IR), thermogravimetric analysis (TGA), and N 2 Brunauer-Emmett-Teller surface area measurements. Batch adsorption experimental factors including initial pH, the amount of adsorbent and adsorption time were investigated. Under optimal conditions, the maximum adsorption capacity of CR on IL-LDH was 288.63 mg·g −1 , which was higher than that of Mg-Al-LDHs intercalated with sodium dodecylsulfate (LDH-SDS) (90.86 mg·g −1 ). In addition, the adsorption of CR on IL-LDH had no obvious change when initial pH values were changed from 5.0 to 10.0, which indicated the adsorbent was pH-independent. Based on the above results, ionic liquid-modified layered double hydroxide may constitute a potential adsorbent for water purification .
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CARBON
·
2018
·
IF 7.082
Dewei Wang,Jiawang Nai,Hua Li,Lang Xu,Yatong Wang
Porous nanocarbons are considered to be one of the key materials for electrochemical energy storage and conversion systems. In the present work, a straightforward one-step technique based on versatile magnesiothermic reduction combined with conventional KOH activation has been developed. We found that the magnesium (Mg) fulfilled multiple roles in the whole reaction and indispensable for achieving control over the organization of 2D nanobuilding blocks. Encouragingly, the same procedures can be successfully applied to a variety of carbon-rich chemicals as carbon sources to produce porous nanocarbons constructed by nanosheets . The intriguing structural features hold a great promise for electrochemical energy storage applications. As a typical example, the resultant HPCMC-1(synthesis from carboxymethylcellulose sodium) possesses unique interconnected carbon sheets network structures with a very large specific surface area and optimal bimodal microporous size distributions. The distinct structural features endow HPCMC-1 electrodes with excellent capacitive storage performance in ionic liquid electrolyte, which show large specific capacitance, good rate capability, long cycling performance and excellent synergetic energy-power outputting capabilities. Considering the general synthetic strategy together with the material sustainability, our work may open up another way for design and controllable fabrication nanocarbon architectures for applications in electrochemical energy storage fields with high performance.
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ChemElectroChem
·
2019
·Vol. 6
·期 14
·3674-3683
·
IF 3.975
Teng Huang,Man-Cheng Long,Gang Wu,Yu-Zhong Wang,Xiu-Li Wang
Graphical Fireproof : A hybrid hierarchical poly(ionic liquid)-based quasi-solid electrolyte containing silica nanoparticles (SiO 2 -PIL-QSE) is prepared through a one-step in situ polymerization and added to a poly(vinylidene fluoride-hexafluoropropylene) porous membrane. The freestanding SiO 2 -PIL-QSE exhibits high fire retardancy and the hierarchical porous structure is beneficial for the efficient and stable migration of ions, leading to an excellent long-life cycling performance, which indicates good prospects in the field of flexible safe lithium batteries. Ionic liquid electrolytes (ILEs), owing to their wide electrochemical window, high ionic conductivity, and low volatility, have been extensively applied in the field of energy storage devices. However, it is extremely significant and greatly challenging to seek the counterbalance of good mechanical properties and excellent electrochemical performances, including a high transference number of ILEs for safe flexible lithium batteries. In this work, a novel hybrid poly(ionic liquid)-based quasi-solid electrolyte containing silica nanoparticles (SiO 2 -PIL-QSE) is fabricated through the one-step in situ polymerization of the ionic liquid covalently tethered to silica nanoparticles (SiO 2 -IL-TFSI), which fills a poly(vinylidene fluoride-hexafluoropropylene) (PVdF-HFP) porous membrane prepared through phase inversion. The hybrid hierarchical porous architecture endows the SiO 2 -PIL-QSE with excellent thermal stability, good fire safety (i. e. nonflammable and low shrinkage), improved mechanical strength, and excellent electrochemical performance, including a high room-temperature ionic conductivity of 1.69 mS cm −1 , a superior electrochemical window up to 5.5 V, as well as a high lithium-ion transference of 0.46. Accordingly, the LiFePO 4 |SiO 2 -PIL-QSE|Li cell can maintain a discharge specific capacity of 133.7 mAh g −1 at 0.1 C at 25 °C with a capacity retention ratio of 91.9 % after 400 cycles. The excellent performances and good applicability in the pouch-type battery of SiO 2 -PIL-QSE indicate a good prospect in the field of flexible solid-state polymer batteries (SSPB).
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NEW JOURNAL OF CHEMISTRY
·
2019
·Vol. 43
·期 24
·9345-9353
·
IF 3.069
Yuheng Zhang,Qi Li,Qing Gao,Jiawei Li,Yongxuan Shen,Xiashi Zhu
In this paper, the ionic liquid (IL), 1-octyl-3-methylimidazolium hexafluorophosphate ([Omim][PF6]), was employed to synthesize β-cyclodextrin (β-CD)-functionalized carbon nanotubes/TiO2 (IL–CD-CNTs/TiO2) nanocomposite via a one-pot solvothermal process. The as-prepared product was characterized by SEM, TEM, XRD, TG, FT-IR, EIS, and so forth. Coupled with an aspirated in-syringe device, IL–CD-CNTs/TiO2 could yield the rapid removal of water contaminants within 8 min. In addition to the excellent adsorption capacity, this dual-functional photocatalyst also showed enhanced photocatalytic activity under visible light at a degradation rate of 97% within 180 min. The photocatalytic mechanism based on the formation of the inclusion complex, density functional theory, and electronic structure of IL–CD-CNTs/TiO2 was comprehensively discussed. The IL not only served as the reaction medium but also played a crucial role in improving the adsorption capacity and photocatalytic activity. By exhibiting a strong electron-donating character, IL could promote efficient charge transfer, inhibiting the recombination of photogenerated electron–hole pairs. The as-prepared photocatalyst—capable of rapid adsorption and photodegradation—can meet the requirements of practical applications and reveals a promising direction toward wastewater treatment.
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JOURNAL OF MOLECULAR LIQUIDS
·
2013
·
IF 1.684
Shengping Wen,Jun Wu,Xiashi Zhu
A simple method for the speciation of chromium(III)/chromium(VI) by flame atomic absorption spectrometry (FAAS) after room temperature ionic liquid (1-octyl-3-methylimidazolium hexafluorophosophate, [C 8 MIM][PF 6 ])-based dispersive liquid–liquid microextraction (DLLME) was developed. Chromium(VI) and total chromium (Cr(VI) and Cr(III)) could be extracted by [C 8 MIM][PF 6 ] at the pH value of 5.0 and 6.5, respectively. The Cr(III) content was calculated by subtracting Cr(VI) from the total chromium. The main factors of DLLME were investigated. Under the optimized conditions, the detection limits (3σ) for Cr(III) and Cr(VI) were 1.00 μg L − 1 and 0.41 μg L − 1 . The relative standard deviations (RSDs) for Cr(III) and Cr(VI) were 3.3% and 4.0% (n = 5, c = 80.00 μg L − 1 ), respectively. The calibration curve exhibited linearity over the concentration range of 5.00–200 μg L − 1 and 3.00–800 μg L − 1 for Cr(III) and Cr(VI). The proposed method was validated by the speciation of Cr(III)/Cr(VI) in certified reference materials for environmental water sample and real samples with satisfactory results.
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TALANTA
·
2013
·
IF 3.498
Xiaofei Liu,Xin Lu,Yong Huang,Chengwei Liu,Shulin Zhao
A novel nano-adsorbent, Fe 3 O 4 @ionic liquid@methyl orange nanoparticles (Fe 3 O 4 @IL@MO NPs), was prepared for magnetic solid-phase extraction (MSPE) of polycyclic aromatic hydrocarbons (PAHs) in environmental water samples. The Fe 3 O 4 @IL@MO NPs were synthesized by self-assembly of the ionic liquid 1-octadecyl-3-methylimidazolium bromide (C18mimBr) and methyl orange (MO) onto the surface of Fe 3 O 4 silica magnetic nanoparticles , as confirmed by infrared spectroscopy, ultraviolet–visible spectroscopy and superconducting quantum interface device magnetometer. The extraction performance of Fe 3 O 4 @IL@MO NPs as a nano-adsorbent was evaluated by using five PAHs, fluorene (FLu), anthracene (AnT), pyrene (Pyr), benzo(a)anthracene (BaA) and benzo(a)pyrene (BaP) as model analytes. Under the optimum conditions, detection limits in the range of 0.1–2 ng/L were obtained by high performance liquid chromatography–fluorescence detection (HPLC–FLD). This method has been successfully applied for the determination of PAHs in environmental water samples by using the MSPE–HPLC–FLD. The recoveries for the five PAHs tested in spiked real water samples were in the range of 80.4–104.0% with relative standard deviations ranging from 2.3 to 4.9%.
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JOURNAL OF CHROMATOGRAPHY A
·
2014
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IF 4.258
Hongyuan Yan,Chen Yang,Yunyun Sun,Kyung Ho Row
A new type of ionic liquid molecularly imprinted polymers (IL–MIPs) synthesized by precipitation polymerization using 1-allyl-3-methylimidazolium bromide as an auxiliary solvent and α-chloro-dichlorodiphenyltrichloroethane (α-chloro-DDT) as the template was applied as a selective sorbent of minimized pipette tip-solid-phase extraction (PT-SPE) for rapid isolation and extraction of dicofol (DCF) from celery samples. The pretreatment procedure of celery samples involved only 2.0 mg of IL–MIPs, 0.8 mL of acetonitrile–water (ACN–H 2 O; 1:1, v/v) (washing solvent), and 1.0 mL of acetone–10% acetic acid (HOAc) (elution solvent). Compared with molecularly imprinted polymers (MIPs), ionic liquid–non-imprinted polymers (IL–NIPs) and conventional sorbents such as C 18 , Si, NH 2 , and Al 2 O 3 –N, IL–MIPs showed higher adsorption and purification capacity to DCF in aqueous solution. Good linearity for DCF was observed in the range from 2.3 to 232.5 ng g −1 ( r 2 = 0.9995). The average recoveries at three spiking levels ranged from 86.6% to 101.9% with relative standard deviations (RSDs) of ≤6.5% ( n = 3). The presented IL–MIPs–PT-SPE–GC/ECD method combines the advantages of MIPs, IL, and PT-SPE, and can be used in aqueous conditions with high affinity and selectivity to analytes of complex samples.
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