CHROMATOGRAPHIA
·
2016
·Vol. 79
·期 7
·441-449
·
IF 1.332
Liu Sha,Wang Cuiling,He Shuai,Bai Ligai,Liu Haiyan
A poly(ionic liquid-glycidylmethacrylate-co-ethyleneglycol dimethacrylate) monolithic column was prepared via in situ free-radical polymerisation and used as an on-line solid-phase extraction column. The obtained monolithic column was characterized by scanning electron microscopy, Fourier transform infrared spectrometer, nitrogen adsorption–desorption measurement, and mercury intrusion porosimetry, which showed a relatively uniform and porous structure. During the on-line solid-phase extraction–high performance liquid chromatography protocol, nifedipine, nitrendipine, and felodipine were separated efficiently from human plasma using a methanol–water linear gradient at a flow rate of 1.0 mL min −1 . The extraction efficiency for the targets was satisfactory with no matrix interference. Under the optimized extraction conditions, the linear regression coefficient was >0.9973; precisions for inter- and intra-day assays presented as relative standard deviations were less than 7.29 %, and the accuracy and recovery was in the range of 96–105 and 90–106 %, respectively. As a result, the polymerization monolithic column exhibited high selectivity and good permeability, and it was feasible to be used as an on-line SPE column. Meanwhile, validation assays also demonstrated acceptable sensitivity and precision for simultaneous quantitative screening of nifedipine, nitrendipine, and felodipine in human plasma.
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RSC Advances
·
2017
·Vol. 7
·期 77
·48526-48536
·
IF 3.108
Qian Zeng,Jinwei Zhang,Hongye Cheng,Lifang Chen,Zhiwen Qi
Ionic liquids (IL) become more promising in industrial applications, especially in desulfurization processes. It is of great importance to investigate their corrosivity to steel and the effect of steel corrosion on desulfurization performance. In this work, the corrosion behavior of two typical metals, namely mild steel and stainless steel, in 1-butyl-3-methylimidazolium hydrogen sulfate ([BMIM]HSO4) IL systems for desulfurization application were investigated by weight loss and surface analyses. The model oil can inhibit the IL corrosivity, while the presence of water or H2O2 enhances the corrosion degree. The bonding information of [BMIM]HSO4 adsorbed on a steel surface was confirmed using ATR-FTIR. It was found that the IL film is mainly adsorbed on the metal surface by the interaction of the imidazolium group of the cation and HSO4− of the anion with the steel surface. From the ICP-MS and Raman analyses, the primary component of corrosion products is iron sulfate (ferric sulfate for mild steel and ferrous sulfate for stainless steel). Localized corrosion (pitting and/or intergranular corrosion) appears on steel surface from SEM observation, which could be a serious safety risk to the [BMIM]HSO4-based desulfurization systems for industrial application. The corrosion has a side effect on the desulfurization performance of [BMIM]HSO4.
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ELECTROCHIMICA ACTA
·
2017
·
IF 4.798
Yuenan Chen,Ziming Li,Nanjun Chen,Rui Li,Yajun Zhang,Ke Li,Fanghui Wang,Hong Zhu
In this paper, we prepared a series of ionic liquids including methyl ionic liquids, ethyl ionic liquids and hydroxyethyl ionic liquids. We used the common polymer backbone polyphenylene ether and the conventional conductive group triethylamine . We introduced three different ionic liquids to investigate different effects of the extent of ion conductivity improvement from its structure change. The introduction of ionic liquid significantly improved the ionic conductivity of the alkaline membrane. The highest conductivity of the composite membranes was 2.5 times higher than that of the pure membrane. A certain amount of nano-TiO 2 was added into the membranes through ultrasound dispersion to form a series of trimethylamine-nano-TiO 2 -ionic liquid composite membranes. We found that TiO 2 -ethyl ionic liquid composite membrane has optimal performance, whose ionic conductivity up to 59.27 mS/cm. and the degradation rate of ionic conductivity is 27.4% under strong alkali conditions. The water uptake and swelling ratio of the composite membrane are relatively low, and the thermal stability and mechanical properties also meet the requirements of the application.
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TALANTA
·
2016
·
IF 4.035
Li-Shun Zhang,Qing-Li Zhao,Xin-Xin Li,Xi-Xi Li,Yan-Ping Huang,Zhao-Sheng Liu
A hybrid monolith incorporated with mesoporous molecular sieve MCM-41 of uniform pore structure and high surface area was prepared with binary green porogens in the first time. With a mixture of room temperature ionic liquids and deep eutectic solvents as porogens, MCM-41 was modified with 3-(trimethoxysilyl) propyl methacrylate (γ-MPS) and the resulting MCM-41-MPS was incorporated into poly (BMA-co-EDMA) monoliths covalently. Because of good dispersibility of MCM-41-MPS in the green solvent-based polymerization system, high permeability and homogeneity for the resultant hybrid monolithic columns was achieved. The MCM-41-MPS grafted monolith was characterized by scanning electron microscopy, energy dispersive spectrometer area scanning, transmission electron microscopy, FT-IR spectra and nitrogen adsorption tests. Chromatographic performance of MCM-41-MPS grafted monolith was characterized by separating small molecules in capillary electrochromatography , including phenol series, naphthyl substitutes, aniline series and alkyl benzenes. The maximum column efficiency of MCM-41-MPS grafted monolith reached 209,000 plates/m, which was twice higher than the corresponding MCM-41-MPS free monolith. Moreover, successful separation of non-steroidal anti-inflammatory drugs and polycyclic aromatic hydrocarbons demonstrated the capacity in broad-spectrum application of the MCM-41-MPS incorporated monolith. The results indicated that green synthesis using room temperature ionic liquid and deep eutectic solvents is an effective method to prepare molecular sieve-incorporated monolithic column.
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CHEMICAL ENGINEERING JOURNAL
·
2016
·
IF 5.31
Hong Zhang,Xiaoyu Yang,Zhaohui Liu,Yanzhao Yang
An arisen and environment-friendly method of cloud point extraction (CPE) which involved Octylphenoxypolyethoxyethanol (TX-114) as surfactant and 2-Mercaptobenzothiazole-functionalized ionic liquid as extractant was carried out to separate Ru(III) from aqueous phase to bottom surfactant phase for the first time. A host of variable ( e.g. , the extractant concentration, hydrochloric acid concentration, nitric acid concentration, TX-114 mass fraction, TX-114 volume and sodium chloride concentration) were evaluated and optimized to investigate the extraction behavior. At optimized experimental conditions, the extraction percentage of Ru(III) was found to be 82%, together with the enrichment factor of 40. A special complexation extraction mechanism of Ru(III) in CPE process was studied systemically and confirmed via job method, UV–vis spectrum and FT-IR spectrum in detail. Taking together, the rational-designed functional ionic liquid as a novel extractant exhibited superior extractability for Ru(III) in CPE system.
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JOURNAL OF SOLID STATE ELECTROCHEMISTRY
·
2016
·Vol. 21
·期 3
·793-801
·
IF 2.327
Dong Sheying,Li Miao,Wei Wenbo,Liu Dan,Huang Tinglin
A substantial outstanding challenge in diagnostics and disease monitoring is the ability to assay rapidly and conveniently for protein biomarkers within complex biological media. Bi 2 Se 3 , as an important topological insulator (TI) material, was synthesized by a solvothermal method and characterized structurally. Subsequently, the composite of Bi 2 Se 3 and ionic liquid ([BMIm]BF 4 IL) was used as a sensing interface to cross-link goat anti-human immunoglobulin G (anti-IgG) via glutaraldehyde (GA) to fabricate an Bi 2 Se 3 /IL/GA/anti-IgG-carbon paste electrode (CPE). The nonspecific binding sites were enclosed with bovine serum albumin (BSA) to develop a label-free IgG immunosensor. The result showed that the proposed label-free IgG immunosensor exhibited high specificity with a detection limit of 0.8 ng mL −1 and linear range from 2 to 300, and 300 to 2200 ng mL −1 . Besides, the immunosensor exhibited high specificity for IgG detection, acceptable reproducibility, and stability. Thus, the strategy reported here paved a simple way to design a sensitive and cost-effective sensing platform for extension to other disease biomarkers.
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FOOD CHEMISTRY
·
2017
·
IF 4.529
Houmei Liu,Zhan Li,Makoto Takafuji,Hirotaka Ihara,Hongdeng Qiu
A novel and versatile adsorbent based on 1-octadecylimidazolium ionic liquid modified magnetic nanoparticles (Fe 3 O 4 @SiO 2 @ImC18) possessing of both magnetic property and excellent adsorption ability was successfully synthesized. Twelve compounds from four kinds of substances (alkylbenzenes, PAHs, flavonoids and organic acids) were chosen as probe molecules to evaluate adsorption properties of the new adsorbent. A series of adsorption experiments were conducted and results indicated both synergism and competition effects were existed and multiple interactions took place during adsorption process. After considerable acquaintances with the adsorbent, it was successfully applied for real samples analysis of honey and cinnamon. Three flavonoid compounds of myricetin, quercetin and luteolin from honey and cinnamic acid from cinnamon were all detected and quantified. Meanwhile, it reached 280-fold concentration reduction of interferent during the extraction of cinnamic acid from cinnamon. The recoveries were in the range of 85.4–94.8% with relative standard deviations ( n = 3) of 2.5–5.6%.The current study not only provided a strategy to evaluate new adsorbent, but also demonstrated the novel Fe 3 O 4 @SiO 2 @ImC18 material was reliable, accurate and suitable for sample pretreatment in pharmaceutical and food chemistry.
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Energy Technology
·
2016
·Vol. 4
·期 9
·1112-1118
·
IF 2.557
Handong Jiao,Junxiang Wang,Jiguo Tu,Haiping Lei,Shuqiang Jiao
An aluminum-ion asymmetric supercapacitor was assembled utilizing a cathode made of multi-walled carbon nanotubes (MWCNTs) in an ionic liquid 1-ethyl-3-methylimidazolium chloride ([EMIm]Cl)-based electrolyte. Two types of energy-storage mechanisms, that is, electrochemical double-layer capacitance (adsorption/desorption of AlCl 4 − on the surface) and limited intercalation pseudocapacitance (intercalation/deintercalation of AlCl 4 − in the graphite layer) at low current density, were observed and characterized. Meanwhile, the specific capacitance and cyclic stability of this supercapacitor were also evaluated by using galvanostatically charging–discharging. The result demonstrates that the specific capacitance decreases with increasing current density, which corresponds to the two types of energy-storage mechanisms of this device. The corresponding retention rate of this device after 3500 cycles at current density of 0.4 A g −1 was 82.4 %, which shows good cyclic stability.
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Food Analytical Methods
·
2017
·Vol. 11
·期 1
·270-281
·
IF 2.038
Pang Long,Yang Peijie,Pang Rong,Lu Xiaoling,Xiao Jingwen,Li Shunyi,Zhang Hongzhong,Zhao Jihong
In this work, a novel fiber coating was prepared by using a hybrid material of silica-based ionogels and ionic liquid 1-hexadecyl-3-methylimidazolium bis(trifuluoromethylsulfonyl)imide ([C 16 MIM][NTf 2 ]). Instead of chemical bonding to sol-gel matrix, high loadings of [C 16 MIM][NTf 2 ] was confined into the network of silica-based ionogels and thus, the extraction efficiency was significantly improved. The prepared fiber was used for solid-phase microextraction (SPME) of four organophosphorus pesticides (OPPs) from wine and juice samples prior to gas chromatography coupled with flame photometric detection. Under the optimized conditions, the proposed method results in good linearity ( R
2 > 0.9991), with low method detection limits (MDLs, S / N = 3) and method quantification limits (MQLs, S / N = 10) in the range of 0.57–4.13 and 1.89–13.76 ng L −1 , respectively. The precisions of the method were assessed with repeatability and reproducibility of RSD% ˂28 and ˂23%, respectively. The spiked recoveries of OPPs from wine and juice samples were in the range of 54 ± 5–118 ± 20 and 56 ± 14–109±12%, at two different concentration levels. The expanded uncertainties at 1 μg L −1 were below 20% for target OPPs in all selected samples.
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CRYSTENGCOMM
·
2017
·Vol. 19
·期 34
·5048-5057
·
IF 3.474
Kaisheng Yao,Chenchen Zhao,Nannan Sun,Weiwei Lu,Yuan Zhang,Huiyong Wang,Jianji Wang
Rational design of ingenious strategies to build hierarchical architectures of nanomaterials is highly desirable and technically important due to their excellent properties and widespread application in varied fields. Here, we report a facile one-pot approach for the solvothermal synthesis of freestanding CuS nanowalls with the assistance of a common ionic liquid, 1-decyl-3-methylimidazolium bromide ([C10mim]Br). In the presence of [C10mim]Br, intriguing CuS nanowalls have been fully constructed from the as-generated CuS thin nanosheets at the liquid–liquid interface of chloroform and water. An outstanding feature is that no hard template is utilized to support and/or assist the growth of CuS nanowalls. The as-prepared CuS nanowalls have been characterized and analyzed systematically and a series of factors affecting the morphology have been investigated. It is found that the alkyl chain length, anionic nature and heterocyclic structure of ionic liquids play an important role in directing the formation of freestanding CuS nanowalls. A possible growth mechanism for the formation of CuS nanowalls is presented based on control experiments. In addition, the as-synthesized CuS nanowalls demonstrate prominent catalytic activity for the thermal decomposition of ammonium perchlorate (AP).
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RSC Advances
·
2016
·Vol. 6
·期 103
·101485-101491
·
IF 3.289
Hui Chen,Jinxia Zhou,Jingbo Mao,Jingmei Yin,Shenmin Li
Separation of a compound from an ionic liquid through extraction usually results in a low mass transfer rate because of the high viscosity of the ionic liquid and the large density difference between the ionic liquid and organics even under strong stirring. An improved interface mass transfer during extraction or biphasic reaction was realized by creating a bubbling effect in a biphasic system containing an ionic liquid. In a model biphasic system containing 1-butyl-3-methylimidazolium chloride ([BMIM]Cl) as the solvent phase and methyl isobutyl ketone (MIBK) as the extraction phase, the bubbling reagents partitioned in the [BMIM]Cl phase, such as methanol, ethanol and acetonitrile, exhibit dynamic equilibrium between the two phases through constant gasification from and dissolution into the [BMIM]Cl phase. Bubbling increases the interface area and dynamically enhances the turbulence of the mixture; both phenomena are beneficial for fast transfer of 5-hydroxymethylfurfural from the ionic liquid phase to the extraction phase. The organic solvents suitable as bubbling reagents were identified, and the key parameters in establishing bubbling biphasic systems were determined.
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ACS Applied Materials & Interfaces
·
2016
·
IF 7.145
Jingting Zhu,Aibin Huang,Haibin Ma,Yining Ma,Kun Tong,Shidong Ji,Shanhu Bao,Xun Cao,Ping Jin
Vanadium dioxide (VO2), as a typical thermochromic material used in smart windows, is always limited by its weaker solar regulation efficiency (ΔTsol) and lower luminous transmittance (Tlum). Except for common approaches such as doping, coating, and special structure, compositing is another effective method. The macroscopic thermochromic (from colorless to blue) ionic liquid–nickel–chlorine (IL–Ni–Cl) complexes are selected in this paper to be combined with VO2 nanoparticles forming a composite film. This novel scheme demonstrates outstanding optical properties: ΔTsol = 26.45% and Tlum,l = 66.44%, Tlum,h = 43.93%. Besides, the addition of the IL–Ni–Cl complexes endows the film with an obvious color change from light brown to dark green as temperature rises. This splendid visible thermochromic performance makes the composite film superior in function exhibiting and application of smart windows.
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危险品化学品经营许可证（带存储）