TALANTA
·
2014
·
IF 3.511
Xiaofeng Wang,Zheng You,Hailiang Sha,Yong Cheng,Huanhuan Zhu,Wei Sun
A DNA and graphene (GR) bi-layer modified carbon ionic liquid electrode (CILE) was fabricated by an electrodeposition method. GR nanosheets were electrodeposited on the surface of CILE at the potential of −1.3 V and then DNA was further deposited at the potential of +0.5 V on GR modified CILE. Electrochemical performances of the fabricated DNA/GR/CILE were carefully investigated. Then electrochemical behaviors of dopamine (DA) on the modified electrode were studied with the calculated electrochemical parameters. Under the optimized conditions, a linear relationship between the oxidation peak current and the concentration of DA was obtained in the range from 0.1 μmol/L to 1.0 mmol/L with a detection limit of 0.027 μmol/L (3 σ ). The modified electrode exhibited excellent reproducibility, repeatability, stability, validation and robustness for the electrochemical detection of DA. The proposed method was further applied to the DA injection solution and human urine samples determination with satisfactory results.
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ANALYTICAL LETTERS
·
2014
·
IF 1.019
Ou Sha,Xiashi Zhu
A new simplified extraction of gold(III) using a room-temperature ionic liquid prior to determination by flame atomic absorption spectrometry has been developed. The extraction method uses 1-butyl-3-methylimidazolium hexafluorophosphate without a chelating agent. The parameters of the extraction system were investigated in detail. Under the optimized conditions, a linear range of 0.19 to 38.20 µg · mL−1, a limit of detection of 0.072 µg · mL−1, an enrichment factor of 10.0, and an extraction capacity of 6.6 mg · g−1 were obtained. The extraction mechanism and the selectivity of 1-butyl-3-methylimidazolium hexafluorophosphate for gold(III) were also investigated. The method was applied for the determination of gold(III) in water samples with satisfactory results.
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ELECTROCHIMICA ACTA
·
2014
·
IF 4.086
Mingjun Dong,Zhihan Nan,Panpan Liu,Yanjun Zhang,Zhonghua Xue,Xiaoquan Lu,Xiuhui Liu
A novel scheme for fabrication of hydrophobic ionic liquid-capped gold nanoparticles (IL-capped AuNPs) modified electrode is presented and its application potential for cholesterol biosensor is investigated. Highly stable gold nanoparticles were characterized by UV–vis absorption spectroscopy and transmission electron microscopy (TEM). Cyclic voltammetry (CV) and electrochemical impedance spectroscopy (EIS) indicated that IL-capped AuNPs nanocomposites showed excellent electrical conductivity. Furthermore, cholesterol oxidase (ChOx) was directly immobilized on the IL-capped AuNPs nanocomposite, and then the direct electrochemistry of ChOx on the modified glass carbon electrode (GCE) was obtained. As a new platform in cholesterol analysis, ChOx-IL-capped AuNPs/GCE exhibited a linear response to cholesterol in the range of 0.1–50 μM with a detection limit of 0.033 μM. Therefore, hydrophobic ionic liquid-capped gold nanoparticles would serve as a good candidate material to construct the related enzyme biosensors.
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JOURNAL OF MEMBRANE SCIENCE
·
2013
·
IF 4.093
Mingtao Li,Bolun Yang,Lu Wang,Ying Zhang,Zhan Zhang,Shaohua Fang,Zhengxi Zhang
New polymerized ionic liquids (PILs) based on tetraalkylammonium cations with N(CF 3 SO 2 ) 2 − (TFSI − ) anions are synthesized by homopolymerization and anion exchange reaction. Furthermore, a gel polymer electrolyte membrane based on the PILs as polymer host is prepared incorporating a tetraalkylammonium ionic liquid, LiTFSI salt and nano-size SiO 2 . The gel polymer electrolyte membranes show exceptional thermal and electrochemical properties . They are found to be thermally stable up to 336 °C. With the increase of the IL, T g of the PIL-based electrolyte samples decreases obviously. When the IL concentration is 25 wt%, the ionic conductivity of the electrolytes reaches 4.9×10 −4 S cm −1 at 60 °C. After 130 cycles, the Li/LiFePO 4 battery with the gel polymer electrolyte membranes at 60 °C has discharge capacity of 122 mA h g −1 at 0.1 current rates.
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Analytical Methods
·
2014
·Vol. 6
·期 15
·5886-5890
·
IF 1.938
Wenzhi Tang,Jiazheng Zhou,Qunqing Yang,Qiqi Zheng,Jian Wu
A novel electrode made of carbon nanotube and ionic liquid (n-octylpyridinium hexafluorophosphate) was developed for the solid-phase extraction and detection of methyl parathion (MP). The electrode effectively accumulated MP and increased the cathodic peak current. Cyclic voltammetry was used to characterize the fabricated electrode and the electrochemical properties of MP on it. Linear sweep voltammetry was used for the quantitative detection of MP. A self-correcting algorithm was exploited to isolate the small peak of MP from the large background current, obtaining a remarkable peak for MP along with a flat baseline. With a preconcentration time of 3 minutes, the peak current was linear for MP concentrations in the range from 0.1 to 2.5 μg mL−1 with a detection limit of 0.008 μg mL−1 (S/N = 3). The electrode was applied to detect MP in soil and food samples. These results indicated that the proposed method was capable of monitoring MP, providing a simple approach for routine analysis.
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CHINESE JOURNAL OF CHEMISTRY
·
2014
·Vol. 32
·期 5
·434-442
·
IF 1.04
Changhua Song,Hui Liu,Yuan Li,Shuai Ge,Hongwei Wang,Wenshuai Zhu,Yonghui Chang,Changri Han,Huaming Li
A series of metal-Al 2 O 3 catalysts were prepared simply by the conventional impregnation with Al 2 O 3 and metal chlorides, which were applied to the dehydration of fructose to 5-hydroxymethylfurfural (HMF). An agreeable HMF yield of 93.1% was achieved from fructose at mild conditions (100°C and 40 min) when employing Cr(III)-Al 2 O 3 as catalyst in 1-butyl-3-methylimidazolium chloride ([Bmim]Cl). The Cr(III)-Al 2 O 3 catalyst was characterized via XRD, DRS and Raman spectra and the results clarified the interaction between the Cr(III) and the alumina support. Meanwhile, the reaction solvents ([Bmim]Cl) collected after 1 st reaction run and 5 th reaction run were analyzed by ICP-OES and LC-ITMS and the results confirmed that no Cr(III) ion was dropped off from the alumina support during the fructose dehydration. Notably, Cr(III)-Al 2 O 3 catalyst had an excellent catalytic performance for glucose and sucrose and the HMF yields were reached to 73.7% and 84.1% at 120°C for 60 min, respectively. Furthermore, the system of Cr(III)-Al 2 O 3 and [Bmim]Cl exhibited a constant stability and activity at 100°C for 40 min and a favorable HMF yield was maintained after ten recycles.
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ANALYTICAL AND BIOANALYTICAL CHEMISTRY
·
2013
·Vol. 405
·期 29
·9563-9570
·
IF 3.659
Liu Haiqing,Zhang Lina,Chen Jiangmin,Zhai Yunyun,Zeng Yanbo,Li Lei
Novel imidazole fluorescent ionic liquids with anthracene groups (ImS-FILA) were synthesized for the first time to act as fluorescent probes. They were developed for the determination of superoxide anion radicals (O 2
•- ) in an aqueous system. O 2
•- was produced by pyrogallol autoxidation. The fluorescence of ImS-FILA was quenched by superoxide anion radicals. The π-bond structure of the fluorescent molecules was oxidized and damaged. This method is very simple and sensitive. The linear range of sensitivity was 1–70 μM ImS-FILA, and the detection limit for reactive oxygen species was 0.1 μM. This method was used to detect superoxide radicals in papaya and garlic, with satisfactory results. Further work is needed to demonstrate the utility of this method in detecting reactive oxygen species in a biological aqueous system.
Reaction of fluorescent probes with O 2
•- and the fluorescence change
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RSC Advances
·
2014
·Vol. 4
·期 70
·37381-37388
·
IF 3.708
Houmei Liu,Yong Guo,Xusheng Wang,Xiaojing Liang,Xia Liu
In this study, an amino-terminated ionic liquid modified graphene oxide coated silica composite stationary phase (IL@GO@SiO2) has been synthesized and applied for the separation of B vitamins, amino acids and aromatic acids in hydrophilic interaction chromatography (HILIC) mode. The synthesized novel material was characterized by elemental analysis, field emission scanning electron microscopy and infrared spectroscopy. The chromatographic properties of the IL@GO@ SiO2 phase were compared with those of the pure silica phase, amino-terminated ionic liquid modified silica phase, and graphene oxide modified silica phase. The results show that IL@GO@SiO2 exhibits the best separation efficiency compared to the other three phases, which is ascribed to the existence of the multiple interactions, i.e., electrostatic interactions, π–π interactions and dipole–dipole interactions between the resulting stationary phase and the analytes. The differences between the four stationary phases illustrate that the combination of IL and GO plays an important role in improving the separation efficiency.
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CHEMICAL RESEARCH IN CHINESE UNIVERSITIES
·
2016
·Vol. 32
·期 6
·992-995
·
IF 1.086
Liu Lihong,Wang Chunfeng,Zhuo Kelei
A sensitive electrochemical sensor for determining bisphenol A(BPA) was designed. The sensor was a glassy carbon electrode modified with the surfactant cetyltrimethylammonium bromide and the ionic liquid 1-decyl-3-methylimidazolium tetrafluoroborate. The ability of the new sensor to measure BPA was investigated in cyclic voltammetry experiments. Under optimized conditions, the sensor gave a linear response range for BPA of 2.19×10 −7 ―3.28×10 −5 mol/L and a detection limit of 7.31×10 −8 mol/L( S/N =3). BPA could be determined with a lower detection limit, a wider linear range, and more sensitivity using the sensor than using other electrochemical sensors or high performance liquid chromatography with UV detection. The new sensor was used to determine BPA in tap water with recoveries of 97.5%―98.7% and a relative standard deviation <2.9%. The results show that the sensor can be used to determine trace BPA concentrations in tap water.
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JOURNAL OF SEPARATION SCIENCE
·
2017
·Vol. 40
·期 13
·2769-2778
·
IF 2.557
Jia-Ling Dai,Li-Hua Zhao,Jie-Hua Shi
1-Butyl-3-[(3-trimethoxysilyl)propyl]imidazolium chloride ionic liquid was synthesized and chemically modified onto the inner wall of a fused capillary column as a stationary phase for gas chromatography. The 1-butyl-3-[(3-trimethoxysilyl)propyl]imidazolium chloride ionic liquid bonded capillary column was evaluated in detail. The results revealed that the ionic liquid bonded capillary column exhibited high column efficiency of 1.08 × 10 4 plates/m, and good chromatographic separation selectivity ( α ) for polar and non-polar substances, and a good thermal stability between room temperature and 400°C. Moreover, the determination of thermodynamic parameters and the linear solvation energy relationship were further carried out. The results indicated that the chromatographic retention of each probe molecule on the ionic liquid bonded stationary phase was an enthalpy-driven process, and the system constants of the linear solvation energy relationship signified that the dispersion interaction, the hydrogen bonding acidity and hydrogen bonding basicity were dominant interactions between probes and stationary phase among five interactions during the chromatographic separation. However, the contribution of each specific interaction for the stationary phase is ranked as the dispersion interaction > the hydrogen bonding basicity > the hydrogen bonding acidity.
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JOURNAL OF MOLECULAR STRUCTURE
·
2024
·
IF 4
Qiang Wang,Ziwei Wei,Qiuxia Wang,Hui Yan,Jiaxin Li,Haidong Jia,Songling Yuan,Xiaolong Wen,Han Jia,Pan Huang
The imidazolium-based ionic liquids (ILs) were widely recognized as the eco-friendly corrosion inhibitors. Many literatures focused on enhancing the corrosion inhibition efficacy via the modification of various functional groups to ILs. The present study investigated the corrosion resistance performance of the novel synthesized tripodal IL ([(C 4 im) 3 TA][Cl 3 ]) with a triazine spacer and three imidazolium cations for mild steel (MS) in 1 M HCl solution. The inhibition efficiencies of [(C 4 im) 3 TA][Cl 3 ] at the concentrations of 0.1 mM (55.7 ppm, 80 %) and 0.5 mM (278.5 ppm, 86 %) were found to be comparable to, and higher than that of conventional imidazolium-based ILs 1‑butyl‑3-methylimidazolium chloride (C 4 mimCl) at 10 mM (1747 ppm, 81 %), respectively. The adsorption behavior of [(C 4 im) 3 TA][Cl 3 ] at the metal surface was reflected through X-ray photoelectron spectroscopy, and the adsorption mechanism was further investigated using quantum chemical calculations and molecular dynamics simulations. The results indicated the greater ability of [(C 4 im) 3 TA][Cl 3 ] to form chemical bonds with Fe atoms, which induced the generation of the more stable hydrophobic protection film at the surface. This study presented the novel concept for the structural design of high-efficiency corrosion inhibitors based on imidazolium ILs.
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JOURNAL OF MOLECULAR LIQUIDS
·
2024
·
IF 5.3
Yuchi Liu,Bingxiu Xue,Ruijing Ma,Xiaopeng Zhao,Jianbo Yin
Poly(ionic liquid)s (PILs) are providing potential platforms to develop next generation water-free polyelectrolyte-based electrorheological (ER) fluids because they well overcome water sensitivity problem of classic polyelectrolyte-based ER fluids by incorporating with large size fluoric counterions. Especially, crosslinked PILs (CPILs) can further broaden the working temperature range of ER effect compared to linear PILs. However, the crosslinking network easily restricts the ion dissociation due to decreased dielectric constant and thus weakens ion movement-induced interfacial polarization and ER effect. In this paper, we propose a way to improve ion dissociation and ion movement-induced interfacial polarization of CPILs by doping polar aniline oligomer to improve the dielectric constant of CPILs. Several kinds of CPILs are synthesized and then aniline oligomer is doped into CPILs by swelling method. The structure of doped CPILs is characterized by different techniques, the dielectric property of ER fluids of doped CPIL particles in silicone oil is analyzed by dielectric spectroscopy, and the ER effect of ER fluids of doped CPIL particles is measured by rheometer under electric fields. It shows that doping aniline oligomer can increase the dielectric intensity and decrease the relaxation time and corresponding activation energy of interfacial polarization and improve the ER effect of CPILs with a relatively loose crosslinking network, while doping aniline oligomer has no contribution to the interfacial polarization and ER effect of CPILs with a relatively tight crosslinking network.
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