JOURNAL OF THE ELECTROCHEMICAL SOCIETY
·
2021
·Vol. 168
·期 7
·077511
·
IF 4.316
Yutong Li,Chao Du,Xinsheng Liu,Kai Wang,Huifang Yang,Yonghong Li
A non-enzymatic methyl parathion (MP) electrochemical sensor was fabricated based on hydroxyl functionalized ionic liquid/zeolitic imidazolate framework composites modified glassy carbon electrode (IL-ZIF-67/GCE). Scanning electron microscopy (SEM) was used to study the surface morphologies of the modified electrodes. ZIF-67 could be well dispersed by hydroxyl functionalized ionic liquid. The structures of the modification materials were characterized using Fourier transform infrared spectroscopy (FT-IR). Square wave voltammetry (SWV) was employed to investigate the electrochemical behavior of MP. The factors affecting the performance of the proposed sensor were also optimized. The sensor makes full use of the high conductivity of hydroxyl functionalized IL and the superior electrocatalytic activity of ZIF-67, exhibiting excellent selectivity and stability. Under the optimal conditions, the IL-ZIF-67/GCE showed a good linear relationship for MP in the range of 1–20 ng l−1, and the detection limit was as low as 0.5 ng l−1 (S/N = 3). The sensor was applied for the detection of MP in river water samples, and the sample recoveries ranged from 96.6% to 101.2%.
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FOOD CHEMISTRY
·
2021
·
IF 7.514
Qiaoyun Zhang,Weiwei Cheng,Di Wu,Yuling Yang,Xiao Feng,Chengcheng Gao,Linghan Meng,Xinchun Shen,Yan Zhang,Xiaozhi Tang
An electrochemical sensor was fabricated by modifying nanoporous gold (NPG)-coated glassy carbon electrode (NPG/GCE) with functionalized graphene oxide /chitosan/ionic liquid nanocomposites (fGO/CS/IL). The introduction of ionic liquid (IL) and chitosan (CS) induced higher dispersibility of functionalized graphene oxide (fGO), and was beneficial for the combination of fGO/CS/IL with NPG/GCE. As a result of the synergistic effect of NPG and fGO/CS/IL, the resulted functionalized graphene oxide/chitosan/ionic liquid nanocomposites/nanoporous gold /glassy carbon electrode (fGO/CS/IL/NPG/GCE) showed the highest redox peak current response signal of Amaranth (E123) due to ultrahigh surface area, electronic conductivity as well as the improvement of the surface structure. Under optimized conditions, the enhanced peak currents represented excellent analytical performance for detection of Amaranth in the concentration range from 8.0 to 1200.0 nM. Meanwhile, the fGO/CS/IL/NPG/GCE presented satisfactory sensitivity and selectivity, excellent reproducibility, and long-time stability. For practical applications, the fGO/CS/IL/NPG/GCE was validated for the determination of Amaranth in three types of drinks with satisfactory results.
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COLLOIDS AND SURFACES A-PHYSICOCHEMICAL AND ENGINEERING ASPECTS
·
2021
·
IF 4.539
Yong Gao,Changsheng Sun,Chenze Qi
Room temperature ionic liquids (RTILs)-containing Pickering emulsions exhibit promising application potentials because of the integration of the “green” quality and the tunable applications of RTILs with the advantages of Pickering emulsions, such as the high stability and adjustable droplet size. In the present study, sterically-stabilized polymer nanoparticles (SSPNs) were first prepared via the reversible addition-fragmentation chain transfer (RAFT)-mediated non-aqueous dispersion polymerization , in which poly(lauryl methacrylate) (PLMA) and poly(4-vinyl pyridine) (P4VP) acted as the stabilizer block and the core-forming block, respectively. Kinetically-trapped PLMA- b -P4VP spheres and mixed spherical/worm-like morphologies could be achieved at a target copolymer composition . Subsequently, core cross-linked SSPNs (CSSPNs) were obtained by means of chemical cross-linking of P4VP cores of SSPNs with 1,4-dibromobutane in a diluted solution of SSPNs in toluene (0.4 mg/mL). Stable 1-butyl-3-methylimidazolium tetrafluoroborate-in-toluene ([Bmim][BF 4 ]-in-toluene) non-aqueous Pickering emulsions could be formed at a low emulsifier content of 0.005 wt% adopting CSSPNs with mixed spherical/worm-like morphologies as Pickering emulsifiers. Benefiting from large surface areas of Pickering emulsions and unique chemical/physical properties of RTILs, [Bmim][BF 4 ]-in-toluene Pickering emulsions provided readily available platforms for many organic reactions . As a proof of the concept, proline catalyzed Knoevenagel reaction of 4-nitrobenzaldehyde with malononitrile was chosen as a model here. Both high reaction efficiency and good recyclability were observed.
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JOURNAL OF MEMBRANE SCIENCE
·
2021
·
IF 8.742
Qi Shen,Ding Yu Xing,Feiyun Sun,Wenyi Dong,Fengjiao Zhang
Thin film nanocomposite membranes have become a feasible technology for heavy metal wastewater treatment . However, how to enhance the dispersibility and compatibility of nanomaterials in the selective layer is an important issue to improve the membrane performance of heavy metal removal . In this study, silica-poly(ionic liquid) nanoparticles were incorporated in the selective layer of TFN membranes. 1-Allyl-3-methyl imidazolium hexafluorophosphate ([AMIm]PF 6 ) was selected to modify silica (SiO 2 ) particles. The formed poly([AMIm]+) brushes provided charge properties to enhance dispersibility and organic part to improve compatibility in the polyamide layer of NF membranes. The resultant TFN membranes incorporated with SiO 2 -[AMIm]PF 6 particles exhibited an increment of 34% water permeation and 41.6% MgCl 2 rejection. Moreover, with an average rejection improvement of around 15% for heavy metal ions at pH = 5–6, the SiO 2 -[AMIm]PF 6 /PA membrane showed its superiority beyond the PA membrane. The electropositivity and microporous structure of the SiO 2 -[AMIm]PF 6 particles enhanced their dispersibility and compatibility in the polyamide layer. Meanwhile, the proper pore size and structure of the SiO 2 -[AMIm]PF 6 particles contributed to the channels for water transport and the sieving effect for most heavy metal ions. This work may facilitate the applications of TFN membranes in heavy metal wastewater treatment to alleviate the “trade-off” phenomenon.
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RADIOCHIMICA ACTA
·
2019
·Vol. 108
·期 4
·239-247
·
IF 1.339
Quan Gan,Yimin Cai,Kuirong Fu,Lihua Yuan,Wen Feng
The extraction of U(VI) from aqueous nitric acid solutions with pillar[5]arene-based phosphine oxide (L) and [C8mim][NTf 2 ] ionic liquid dissolved in 1,2-dichloroethane was explored. A great positive impact in this system was observed. The effect of IL concentration in the organic phase and HNO 3 concentration in the aqueous phase is considered. The distribution ratios of U(VI) were significantly enhanced upon adding a small amount of ionic liquid as compared with organic diluent. The extraction system was also examined for its ability towards extraction of lanthanides and Th 4+ . The results revealed higher separation factors towards UO 2 2+ over Th 4+ in the presence of ionic liquid compared with organic diluent. Other factors such as C 8 mim + and NTf 2 − have also been considered. This extraction system has shorter equilibrium time as compared with in IL diluent. Stripping experiments showed almost quantitative back extraction of UO 2 2+ within two stages. With high selectivity towards UO 2 2+ and efficient back extraction, this new POP5A-ionic liquid-organic diluent system shows promise for future application of uranium recovery.
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JOURNAL OF CHROMATOGRAPHY A
·
2019
·
IF 3.858
Guifen Zhu,Wanwan Li,Li Wang,Peiyun Wang,Dongyang Shi,Jianji Wang,Jing Fan
Molecularly imprinted polymers (MIPs) synthesized by conventional functional monomers have poor specific recognition ability in strong polar solvent, which is not favorable to their applications in separation and analysis. In this work, an ionic liquid functional monomer, 1-allyl-3-vinylimidazolium chloridize, is introduced to prepare sulfamonomethoxine imprinted polymer on the surface of silica carriers in methanol. 1 H NMR and 35 Cl NMR spectroscopy is performed to discuss the interactions between template and the functional monomer. The rebinding experiments show that the MIP has excellent selectivity towards sulfonamide antibiotic (sulfamonomethoxine, sulfamethoxazole and sulfadiazine) in methanol. From 1 H NMR and 35 Cl NMR analysis and selective adsorption results, it was inferred that hydrogen bond, electrostatic and π-π interactions are the driving force for the selective recognition of MIP in methanol. Combined solid phase extraction (SPE) with HPLC detection, 98.0–108.0% of sulfamonomethoxine have been extracted by MIP-SPE cartridge from the mixture of sulfamonomethoxine, diphenylamine and N-butylpyridinium chloride. Under optimal condition, the proposed MIP-SPE column can response sulfamonomethoxine linearly in the concentration range from 3.0–1.0×10 4 μg L −1 , and the established MIP-SPE-HPLC system has been successfully applied for extraction and analysis of sulfamonomethoxine in soil and sediment with recoveries ranging from 95.0% to 105.0%.
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NANOTECHNOLOGY
·
2019
·Vol. 30
·期 28
·285503
·
IF 3.399
Zhuangzhi Sun,Lu Yang,Dan Zhang,Fuguo Bian,Wenlong Song
In this work, high-performance biocompatible nano-biocomposite artificial muscles were developed via various thicknesses of renewable microporous ionic electrolytes (ICEs) made of natural biopolymer cellulose dissolved in ionic liquid with excellent ionic conductivity and flexibility. The changing thickness experiments illustrated that 0.7 mm thick ICEs could deliver outstanding areal capacitance of 44.708 mF cm−2 and ionic conductivity of 79.7 μS cm−1, as well as minimum resistance of 1.61 Ω. The current density changed from 1 to 10 Ag−1, and improvements were achieved in energy density (from 3.88 to 21.25 Wh kg−1) and power density (from 2.63 to 5.51 KW kg−1). The voltage window widened from 0.5 to 1 V, and improvements were gained in energy density (from 4.13 to 22.01 Wh kg−1) and power density (from 1.25 to 2.81 KW kg−1). Moreover, good flexibility of 0.7 mm thick ICE with porosity of 89.61% and elastic modulus of 74.38 MPa was discovered. Electromechanical experiments demonstrated from the above results that the maximum peak displacement with 0.3 mm ICE was 5.33 mm at 5 V 0.02 Hz sine wave voltage, and the maximum displacement and force with 0.7 mm ICE was 17.44 mm and 5.93 mN at 5 V DC voltages. These findings suggest that the explored excellent ionic conductivity and flexibility of ICEs holds great promise for the further study of high-performance green actuators.
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NEW JOURNAL OF CHEMISTRY
·
2019
·Vol. 43
·期 23
·8873-8881
·
IF 3.069
Ying Zhang,Dianwei Zhang,Jingmin Liu,Shuo Wang,Huilin Liu
A high photoluminescence sensor based on functionalized room temperature ionic liquid-strengthened sulfur-doped carbon nanodots (IL-strengthened S-Cdots) is developed by a one-pot strategy. It facilitates real-time monitoring of cartap (CP) by a turn-off photoluminescence signal. The introduction of the ionic liquid 1-vinyl-3-butylimidazolium tetrafluoroborate (VBimBF4B) is beneficial to improve the photoluminescence quantum yield and stability of the photoluminescence sensor. VBimBF4B also uses methacrylic acid as the selected receptor to recognize cartap by the specific interaction of hydrogen bonding. The fluorescent response for cartap detection has a linear range between 1 μg L−1 and 100 μg L−1, and the detection limit is 0.86 μg L−1. The photoluminescence sensor shows better selectivity for cartap compared with other interference components. The developed method has been used for optosensing of cartap in complex food matrices, such as Chinese cabbage, cabbage, rapeseed, apple and pear, with a recovery of 78–99% and an observed RSD of 0.7–2.1% for three replicate measurements. These findings indicate the excellent ability of the prepared IL-strengthened S-Cdots to recognize cartap in complex food matrices and the potential of this method for application in cartap detection.
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NEW JOURNAL OF CHEMISTRY
·
2019
·Vol. 43
·期 31
·12275-12282
·
IF 3.069
Beibei Lu,Yuanbin Li,Zhenyuan Wang,Binshen Wang,Xi Pan,Weiwei Zhao,Xing Ma,Jiaheng Zhang
The therapeutic efficacy of anticancer drug delivery systems is severely truncated by their low tumor target ability and inefficient drug release at the target site. Herein, we report the design and synthesis of a novel dual-responsive hyaluronic acid-grafted poly(ionic liquid) block copolymer that was able to self-assemble into spherical nanoparticles in water. Then, the doxorubicin-loaded block copolymer produced particles of 100 nm in size as examined using transmission electron microscopy and dynamic light scattering. The hyaluronic acid-grafted block copolymer micelles were efficiently taken up by CD44-overexpressing cancer cells as indicated by the cell counting kit-8 assays, confocal laser scanning microscopy, and flow cytometry experiments. Therefore, the as-prepared block copolymer micelles had good biocompatibility, low toxicity, and high selectivity, thus offering promise for the treatment of various CD44-overexpressing cancers.
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CHEMICAL ENGINEERING JOURNAL
·
2019
·
IF 8.355
Xue Zhou,Yanying Wang,Chunya Li,Tsunghsueh Wu
Amino group functionalized hydrophobic ionic liquid, 1-ethylamine hydrobromide-3-methylimidazolium hexafluorophosphate (ILPF 6 ) ionic liquid, was employed as the functional monomer to fabricate a carbon-based hole-conductor-free perovskite solar cells with high performances. The photoactive perovskite layer was facilely acquired by one-step spin-coating the precursor solution on a TiO 2 /FTO electrode surface, and subsequently annealed at an initial annealing at 60 °C for 3 min followed by annealing at 100 °C for 10 min to crystallize. The perovskite precursor solution was prepared by mixing ILPF 6 ionic liquid and methylammonium iodide with an equal molar ratio of PbI 2 . In the optimized conditions, the power conversion efficiency (PCE) was enhanced from 10.08% to 13.01% by doping ILPF 6 into the perovskite crystal film. This study demonstrates the multifaceted functions of ILPF 6 ionic liquid in improving the efficiency and stability of PSCs. First, ILPF 6 can react with PbI 2 to form perovskite and can also play a role of the controlling and crosslinking reagent to obtain large grain size and minimize defects. Secondly, ILPF 6 can improve the loading amount of perovskite crystals on the TiO 2 film. Third, ILPF 6 can promote the transport rate of the photogenerated carriers in the perovskite crystal layer. Lastly, ILPF 6 ionic liquid with its high hydrophobicity creates a moisture barrier to improve the stability of PSCs effectively. The PSCs were stored under dark in a low relative humidity atmosphere (RH of 20%) at 25 °C without sealing. After 840 h, the PSC can maintain 94% of its initial PCE under the identical intensity illumination. This study demonstrates an excellent strategy to break through the bottleneck of the traditional PSCs and the enhanced effect of ionic liquid for carbon-based PSCs.
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MICROCHEMICAL JOURNAL
·
2019
·
IF 3.206
Chi Chen,Zhuang Fu,Weiying Zhou,Qiushi Chen,Chenzhao Wang,Lu Xu,Zhibing Wang,Hanqi Zhang
The ionic liquid-immobilized NaY zeolite was prepared by means of impregnation approach and used as the dispersant of matrix solid phase dispersion for the extraction of aloe-emodin, emodin, chrysophanol and physcion in Rheum palmatum L.. High performance liquid chromatography coupled with diode-array detection was used for the separation and determination of target analytes. The ionic liquid-immobilized NaY zeolite was further characterized by SEM, FT-IR, TG, XRD and BET. The experimental parameters, such as type and content of ionic liquid, mass ratio of sample to dispersant, type of washing solvent, and type and volume of elution solvent, were optimized. The results revealed that the prepared ionic liquid-immobilized NaY zeolite presents suitable properties and can be used as the dispersant of matrix solid phase dispersion for the extraction of anthraquinones. Good linearities ( r > 0.9995) were obtained in the range of analyte concentration investigated. The recoveries were 73–98% with the relative standard deviations lower than 6%. Compared with ultrasound-assisted extraction and heat reflux extraction, the present method requires less sample, organic solvent and extraction time. The present method can be applied to the determination of anthraquinones from medicinal plant.
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ANALYST
·
2019
·Vol. 144
·期 24
·7468-7477
·
IF 4.019
Xiaofei Ma,Zigui Kan,Yingxiang Du,Jiangxia Yang,Zijie Feng,Xinqi Zhu,Cheng Chen
This study deals with the nonaqueous capillary electrophoretic enantioseparation of twenty-two amino alcohol drugs with a maltobionic acid (MA)-based ionic liquid (tetramethylammonium maltobionic acid, TMA-MA) as the novel chiral selector. In consideration of the poor solubility of MA in organic solvents, we managed to transform MA into ionic liquids (ILs) for the first time. Interestingly, this chiral selector exhibited powerful enantioselectivity towards the model analytes in company with boric acid. Systematical experiments were carried out to investigate the influence of concentration of TMA-MA, boric acid and tris (hydroxymethyl) aminomethane (Tris) as well as applied voltage on the enantioseparation. A great majority of enantiomers (except labetalol) were baseline separated under the optimized conditions and the effect of the molecular structure of amino alcohol drugs on the chiral separation was discussed. In addition, electrophoretic experiments, nuclear magnetic resonance (NMR), mass spectrometry (MS) and molecular modeling with the Gaussian program were employed to demonstrate the mechanism of chiral recognition. Based on the formation of an ionic liquid-boric acid-analyte complex, hydrogen binding was mainly responsible for enantioseparation.
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危险品化学品经营许可证（带存储）