CHINESE JOURNAL OF CHEMICAL ENGINEERING
·
2023
·
IF 3.8
Yanjing Li,Shilong Dong,Lili Wang,Xiaoyan Sun,Wenying Zhao,Shuguang Xiang
LLE data of cyclooctane/3-methylpentane + benzene/toluene + N -methylpyrrolidone (NMP) at 298.15 K and 313.15 K under a pressure of 101.3 kPa were measured in this work. The Othmer-Tobias and Hand equations were adopted to validate the reliability of LLE data, where the correlation coefficients ( R 2 ) were close to unity, indicating the high reliability of the experimental data. The experimental data were analyzed using the distribution coefficient ( D ) and separation factor ( S ), and the effect of NMP extracting benzene and toluene from aromatics was explored. Meanwhile, the reason for the different extraction efficiencies of benzene and toluene using NMP was analyzed by quantum chemical calculations. The NRTL and UNIQUAC thermodynamic models were used to correlate the liquid–liquid equilibrium data, and the relevant binary interaction parameters were obtained. The calculated root mean square deviation (RMSD) were all less than 0.0063, indicating that the obtained binary interaction parameters can be used to simulate and calculate the extraction of aromatics using NMP.
研究领域:
化学工程
·
物理化学
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产品关联
DOI
高影响因子
ELECTROCHIMICA ACTA
·
2014
·
IF 4.086
Bingbin Wu,Xiaoyu Jiang,Lifen Xiao,Wenhua Zhang,Jiaxin Pan,Xinping Ai,Hanxi Yang,Yuliang Cao
Sulfur has the highest redox capacity in all the solid electrode materials but its application for Li-S batteries is restricted by its poor cycleability due to the dissolution of its polysulfide intermediates produced during charge and discharge reactions. To solve this problem, we proposed a new strategy to suppress the dissolution of the polysulfide intermediates and the agglomeration of the discharge products through surface-modification of the sulfur electrode by in-situ electropolymerized poly(N-methylpyrrole) (PNMP). The PNMP-modified sulfur electrode exhibits stable surface morphology during charge and discharge, effectively depressing the structural collapse of the sulfur electrode. The charge-discharge measurements reveal that the PNMP-modified S/C electrode can deliver the same high reversible capacity as the bare electrode but demonstrate a much improved cycling stability with excellent capacity retention of 78.1% over 200 cycles with respect to the discharge capacity in the third cycle, considerably higher than that of the bare electrode (59.8%). In addition, this surface modification method is simple and affordable, providing a feasible way for improving the long-term cycleability of Li-S batteries.
研究领域:
材料科学
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电化学
✓ 已验证
产品关联
DOI
高影响因子
IET Nanobiotechnology
·
2020
·Vol. 14
·期 2
·167-171
·
IF 1.859
Xiyuan Tong,Shiyao Jin,Yingdai Zhao,Yue Gai,Yifeng E,Dan Li
The electrochemiluminescence (ECL) system based on the ruthenium complex has become a powerful tool in the field of analytical chemistry. However, the non-aqueous ECL luminescence system, which does not involve complex nano-modification, has not been widely used for the determination of analytes. In this study, N -methyl pyrrolidone was selected as the solvent, and it could also act as a co-reactant of . Based on this, a simple ECL system without nanomaterials was established. Strong ECL was generated. Furthermore, a quenching effect between the excited state of and sulphamethoxazole (SMZ) was observed. Based on this, a sensitive ECL sensor for detecting SMZ is constructed. A linear relationship between ECL signal quenching intensity (Δ I ) and the logarithm of SMZ concentration (log C ) in the concentration range of 1 × 10 −7 –1 × 10 −5 mol/l is obtained. The limit of detection is as low as 3.33 × 10 −9 mol/l. The method has been applied to the detection of SMZ in tap water samples with different concentration levels with satisfactory results, and the recovery was 95.3–102.6%.
研究领域:
分析化学
·
生物传感技术
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产品关联
DOI
PubMed
高影响因子
Scientific Reports
·
2023
·Vol. 13
·期 1
·1-8
·
IF 4.6
Shao Xiaodong,Yang Dou,Wang Min,Yue Qiaoli
In this study, a gold nanoparticles colorimetric probe (AuNPs) with direct response to mercury ions (Hg 2+ ) were developed using treated N-methylpyrrolidone (NMP) and chloroauric acid (HAuCl 4 ) as precursors. NMP showed good reducibility after high temperature hydrolysis and could be used as reducing and stabilizing agent to synthesize AuNPs. The prepared AuNPs have obvious characteristic absorption peaks and appear wine-red. At the same time, it was found that the presence of Hg 2+ can cause the aggregation of AuNPs, increased the absorbance at 700 nm, and changed the color of the solution into blue-gray. This method is capable of sensitive and specific determination of Hg 2+ ranging from 1 to 30 μM, with the limit of detection (LOD) at 0.3 μM. The method showed good specificity for the determination of Hg 2+ and has the potential to be applied to Hg 2+ detection in sewage samples in the environment.
研究领域:
分析化学
·
环境科学
✓ 已验证
产品关联
DOI
PubMed
高影响因子
CARBON
·
2019
·
IF 7.466
Weimin Zhang,Jinhong Du,Zhibo Liu,Dingdong Zhang,Qinwei Wei,Haichao Liu,Wei Ma,Wencai Ren,Hui-Ming Cheng
N-methyl-2-pyrrolidone (NMP) has been widely used as a solvent for preparing two-dimensional quantum dots (2D-QDs) by probe sonication . Here we found that carbon dots (CDs) are simultaneously produced by the carbonization of NMP when preparing MoS 2 QDs in a NMP solvent by probe sonication. These two kinds of QDs are similar in color, crystal structure, excitation wavelength dependent photoluminescence (PL), and have overlaps in their absorption spectra and coincidence of PL peaks. As a result, the co-production of CDs has not previously been recognized. The CDs show strong optical interactions with the MoS 2 QDs, which leads to a dramatic decrease in the fluorescence intensity of the CDs/MoS 2 QDs. Moreover, we found that the carbonization also occurs for the commonly used organic solvents . These findings suggest that associated production of CDs should be considered when preparing 2D-QDs by probe sonication, and the resulting hybrid CDs/2D-QDs will provide opportunities to design their properties and uses.
研究领域:
材料科学
·
化学
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产品关联
DOI
高影响因子
ACS Synthetic Biology
·
2019
·
IF 5.571
Yu Ping,Xiaodong Li,Baofu Xu,Wei Wei,Wenping Wei,Guoyin Kai,Zhihua Zhou,Youli Xiao
N-Methylpyrrolinium-derived alkaloids like tropane alkaloids, nicotine, and calystegines are valuable plant source specialized metabolites bearing pharmaceutical or biological activity. Microbial synthesis of the critical common intermediate N-methylpyrrolinium would allow for sustainable production of N-methylpyrrolinium-derived alkaloids. Here, we achieve the production of N-methylpyrrolinium both in Escherichia coli and in Saccharomyces cerevisiae by employing the biosynthetic genes derived from three different plants. Specifically, the diamine oxidases (DAOs) from Anisodus acutangulus were first characterized. Then, we produced N-methylpyrrolinium in vitro from l-ornithine via a combination of the three cascade enzymes, ornithine decarboxylase from Erythroxylum coca, putrescine N-methyltransferase from Anisodus tanguticus, and DAOs from A. acutangulus. Construction of the plant biosynthetic pathway in E. coli and S. cerevisiae resulted in de novo bioproduction of N-methylpyrrolinium with titers of 3.02 and 2.07 mg/L, respectively. Metabolic engineering of the yeast strain to produce N-methylpyrrolinium via decreasing the flux to the product catabolism pathway and improving the cofactor supply resulted in a final titer of 17.82 mg/L. This study not only presents the first microbial synthesis of N-methylpyrrolinium but also lays the foundation for heterologous biosynthesis of N-methylpyrrolinium-derived alkaloids. More importantly, the strains constructed herein can serve as important alternative tools for identifying undiscovered pathway enzymes with a synthetic biology strategy.
研究领域:
生物化学
·
合成生物学
·
微生物学
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产品关联
DOI
PubMed
高影响因子
ENERGY & FUELS
·
2015
·
IF 2.79
Xiao-dong Tang,Tao Hu,Jing-jing Li,Fang Wang,Da-yong Qing
To meet the environmental requirements, kerosene, as the major component of jet fuel, is necessary for deep desulfurization. An electrochemical oxidation–extraction method was proposed to reduce the sulfur content in kerosene in this work. First, the electrochemical oxidation of kerosene was carried out in NaCl solution. Then, N-methyl-2-pyrrolidone (NMP) was used as an extractant to remove the oxidized organic sulfides. Gas chromatography–flame photometric detector (GC–FPD), gas chromatography–mass spectrometry (GC–MS), Fourier transform infrared (FTIR) spectroscopy, and ion chromatography were used to determine 1-heptyl mercaptan, one of the main organic sulfides in kerosene, and its products after electrochemical oxidation. The results showed that 1-heptyl mercaptan was effectively oxidized to diheptyl disulfide, 1-heptanesulfonyl chloride, and sulfate in electrochemical oxidation and removed after extraction. After electrochemical oxidation–extraction, the sulfur content of kerosene decreased from 180.0 to 13.2 μg/g and the desulfurization efficiency reached 92.67%. By gas chromatography–flame ionization detector (GC–FID) analysis of kerosene, the electrochemical oxidation process has no impact on the properties of kerosene. On the basis of these experimental results, a mechanism of electrochemical oxidative desulfurization was proposed.
研究领域:
环境科学
·
能源化学
✓ 已验证
DOI
高影响因子
JOURNAL OF MOLECULAR LIQUIDS
·
2020
·
IF 5.065
Hong Li,Yuhao Zhang,Liang Zhao,Dexin Sun,Jinsen Gao,Chunming Xu
Separation of sulfides from fluid catalytic cracking (FCC) naphtha is of great significance for environmental protection. In this work, the organic solvents N -methyl-2-pyrrolidone (NMP), sulfolane (SUL), and their mixtures were selected to extract sulfides (3-methylthiophene) from model FCC naphtha (n-heptane). Correspondingly, the liquid-liquid phase equilibrium (LLE) data of the systems n-heptane +3-methylthiophene + SUL/NMP/(NMP + SUL) were experimentally obtained at 298.15 K and 101.3 kPa. The distribution coefficient and separation factor were calculated to assess the extraction performance of the solvents. The results showed that mixed solvent (NMP + SUL) could be used as a potential solvent to extract 3-methylthiophene due to its suitable selectivity and solubility. Meanwhile, the density functional theory (DFT) method was applied to explore the extraction mechanism of 3-methylthiophene from n-heptane by NMP or SUL. Electrostatic potential (ESP) analysis, interaction energies, and reduced density gradient (RDG) analysis showed that the main interactions between NMP/SUL and 3-methylthiophene were van der Waals and weak hydrogen bond forces. In addition, the LLE data were correlated by the NRTL and UNIQUAC thermodynamic models with the RMSD values were all <0.30%. Also, the binary interaction parameters were regressed which could be applied for the optimization and design of the separation process.
研究领域:
化学工程
·
环境科学
·
理论化学
✓ 已验证
产品关联
DOI
高影响因子
ELECTROCHIMICA ACTA
·
2015
·
IF 4.504
Jiahui Chen,Yuan Gao,Cuihua Li,Hui Zhang,Jianhong Liu,Qianling Zhang
In this work, we obtained improved electrochemical performance of LiNi 0.5 Mn 1.5 O 4 cathode by using a monomer unit of conducting polymer , N-methylpyrrole (MPL), as an electrolyte additive . The effects of MPL on the performance of high voltage LiNi 0.5 Mn 1.5 O 4 cathode were investigated via the combination of cycling test, cyclic voltammetry , electrochemical impedance spectroscopy and surface analysis . By incorporating 0.3 wt% MPL into electrolyte, the capacity retention of Li/LiNi 0.5 Mn 1.5 O 4 cell after 200 cycles is improved from 83.2% to 89.5% at room temperature (ca. 25 °C) and from 59.1% to 87.4% at elevated temperature (55 °C). Moreover, the discharge capacity of the cell with 0.3 wt% MPL increase by 8% and 18% at 2C and 3C rates respectively. It is proposed that the electrochemical polymerization of MPL take place on the initial charge process and consequently create a thin, stable and conductive film on the LiNi 0.5 Mn 1.5 O 4 surface. The collective effects of this cathode/electrolyte interphase (CEI) film stabilize the interface between cathode and electrolyte and alleviate the electrolyte decomposition during extended cycling, leading to improved performance of Li/LiNi 0.5 Mn 1.5 O 4 cell.
研究领域:
材料科学
·
电化学
✓ 已验证
产品关联
DOI
高影响因子
COMBUSTION AND FLAME
·
2023
·
IF 4.4
Jinglan Wang,Dandan Xu,Xuezhi Gao,Qiang Xu,Zhandong Wang,Jiuzhong Yang,Lili Xing,Junyu Tao,Beibei Yan,Guanyi Chen,Zhanjun Cheng
N-methyl pyrrole (NMP) is an important nitrogenous heterocyclic compound in bio-oils produced from biomass conversion . NMP can be used as surrogate model compound to clarify the combustion chemistry of nitrogenous fuels and NO X formation mechanism. The low- to moderate-temperature oxidation experiments of NMP are carried out in atmospheric pressure jet-stirred reactor for 0.5% NMP/oxygen/Argon mixtures at different equivalence ratios (0.5, 1.0, and 2.0) over the temperature range of 760 – 1030 K. More than twenty species, including reactants, nitrogen-containing species, and oxygenated products, are measured using synchrotron vacuum ultraviolet photoionization mass spectrometry (SVUV-PIMS). A detailed and comprehensive kinetic model for NMP oxidation is developed for the first time based on the pyrrole oxidation model developed by Pelucchi et al. and Chen et al.. Simulated results show that the present model can reasonably reproduce the experimental results. Rate of production analysis indicates that the H-abstraction reactions on the methyl group dominate in NMP oxidation at all equivalence ratios. NMP oxidation produces C4 and C5 nitrogen-containing compounds including pyridine and pyrrole. These species are found to be products of the primary reactions of NMP, and their formation pathways can be explained satisfactorily by the present model. The present work provides a basis to further understand the oxidation characteristics of nitrogen-containing heterocyclic fuels.
研究领域:
能源化学
·
燃烧科学
✓ 已验证
产品关联
DOI
高影响因子
SEPARATION AND PURIFICATION TECHNOLOGY
·
2024
·
IF 8.1
Zhouxin Chang,Wenli Guo,Chen Yang,Changshen Ye,Qinglian Wang,Bochen Li,Yaodong Xiao,Jie Chen,Ting Qiu
The semiconductor industry’s rapid evolution necessitates ultra-high-purity N-methyl pyrrolidone (NMP) as an essential electronic-grade solvent. The development of an efficient coordination material to reduce trace metal ions, particularly Na and K metal ions, to below 1 ppb in NMP solution is a significant challenge. To address this, a novel coordination material, St-DVB-g-ACE, has been developed for the removal of Na and K metal ions from NMP. The material was synthesized by grafting 4′-aminobenzo-15-crown-5-ether onto a strong acid gel resin. The resulting St-DVB-g-ACE-3 exhibited excellent coordination performance for Na and K metal ions, with maximum Langmuir adsorption capacities reaching 20,000 μg/g and 33,333 μg/g, respectively. Of particular interest was the ability of St-DVB-g-ACE-3 to reduce all trace metal ions in industrial-grade NMP to below 1 ppb within a fixed bed column, achieving the stringent requirements for electronic-grade NMP at the G3 level. Additionally, the absorbent enhances the purity of NMP from 99.82 % to 99.84 %, indicating that the material is not dissolved and can exist stably in NMP. Its excellent recyclability and reproducibility make it highly practical for industrial use. Density functional theory (DFT) simulation, complemented by spectral analyses, revealed the interaction force and thermodynamic properties between Na and K metal ions and crown ether ring, and illustrated the interaction between anionic sulfonic group (−SO 3 − ) and metal ions. The prepared resin-grafted crown ether adsorbents are highly effective in the thorough removal of trace metal ions from NMP solution, offering a novel and effective method for the production of electronic-grade NMP.
研究领域:
材料科学
·
化学工程
✓ 已验证
DOI
高影响因子
CARBON
·
2017
·
IF 6.337
Piaopiao Wei,Jian Shen,Kangbing Wu,Chengguo Hu
We report on the study of the electrochemical behavior of liquid exfoliated graphene nanosheets (GS) with varied sizes and thickness by controlling centrifugal speed. GS were prepared via a solvent exfoliation and centrifugation separation method from graphite powder using N-methyl-2-pyrrolidone (NMP) as the solvent and with the assistance of sodium citrate. Scanning electron microscopy (SEM), transmission electron microscopy (TEM), Raman spectra , UV–Vis spectra and particle size measurements were employed to characterize the size and structural changes of GS under different centrifugal speeds. And, the electrochemical properties of these GS materials like redox behaviors, standard heterogeneous rate constant ( k 0 ) and electrochemical impedance were studied using potassium ferricyanide as the probe. Our results suggested that the size and concentration show obvious effects on the electrochemical properties of the solvent exfoliated GS.
研究领域:
材料科学
·
电化学
✓ 已验证
产品关联
DOI
高影响因子
危险品化学品经营许可证（带存储）