JOURNAL OF CHEMICAL AND ENGINEERING DATA
·
2023
·
IF 2.6
Zhenxing Cai,Pingxin Li,Hui Zhao,Lingyan Wang,Xiaobo Chen,Chaohe Yang
The solubility of cyclohexanone, tert-butanol, and 1,4-dioxane in p-, o-, and m-xylenes and ethylbenzene was measured by a gas chromatography method under an atmospheric environment. The measured data indicated that the solubility of cyclohexanone, tert-butanol, and 1,4-dioxane in the xylenes and ethylbenzene increases with increasing temperature. The experimentally determined solubility results were fitted with the modified Apelblat equation, Van’t Hoff equation, and Wilson model. Among them, the Wilson model was most consistent with the measured solubility results. The dissolution-related thermodynamic properties of cyclohexanone, tert-butanol, and 1,4-dioxane in xylenes and ethylbenzene, including the changes of molar Gibbs free energy, molar enthalpy, and molar entropy, were predicted and analyzed via the correlated Wilson model, which indicates that the dissolution behaviors are spontaneous and endothermic process. The obtained solubility results provide the thermodynamic foundation for the development and upgrading of industrial separation processes related to xylene, ethylbenzene, cyclohexanone, tert-butanol, and 1,4-dioxane.
研究领域:
化学工程
·
物理化学
✓ 已验证
产品关联
DOI
高影响因子
JOURNAL OF CHEMICAL AND ENGINEERING DATA
·
2025
·
IF 2.1
Yanmin Shen,Shuting Pan,Yuqi Gao,Jing Wang,Ruyue He,Wanying Wu,Guanghui Wu,Jinbing Zhang,Caihua Yu,Yuxin Wang,Han Wang,Wenju Liu
The mole fraction solubility of loxoprofen was investigated by the gravimetric static method in 14 monosolvents of methanol, ethanol, n-propanol, iso-propanol, methyl acetate, ethyl acetate, n-propyl acetate, iso-propyl acetate, iso-amyl acetate, iso-butyl acetate, butyl acetate, ethyl orthosilicate, acetonitrile, and 1,4-dioxane in the temperature range of 283.15–328.15 K under 0.1 MPa. Experiment results demonstrated that loxoprofen solubility increased positively with increasing temperature. Among 14 monosolvents, the mole fraction solubility of loxoprofen at 298.15 K followed this order: 1,4-dioxane (0.2143) > methanol (0.1185) > iso-propanol (0.09662) ≈ ethanol (0.09431) > n-propanol (0.09045) > methyl acetate (0.08949) > ethyl acetate (0.08475) > n-propyl acetate (0.06314) > iso-propyl acetate (0.0560) > butyl acetate (0.05270) > iso-butyl acetate (0.0451) ≈ iso-amyl acetate (0.04484) > acetonitrile (0.04193) > ethyl orthosilicate (0.03648). The four usually thermodynamic models including the modified Apelblat model, the Yaws model, the Van’t Hoff model, and the λh model were applied to correlate solubility data, and the Yaws model obtained a relatively accurate correlation result by values of RAD and RMSD. Hansen solubility parameters of solvents were quoted to explain the dissolving behavior of loxoprofen in 14 monosolvents.
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DOI
高影响因子
CHEMISTRY OF MATERIALS
·
2016
·
IF 9.407
Fengqiong Tao,Cécile Genevois,Fengqi Lu,Xiaojun Kuang,Florence Porcher,Liangju Li,Tao Yang,Wenbo Li,Di Zhou,Mathieu Allix
Formation of hexagonal perovskite with mixed cubic and hexagonal stacking of AO3 layers becomes more and more difficult when the number of layers in the stacking repeating unit increases. So far, the highest number of layers reported for twinned hexagonal perovskite is 12, with alternative 5 consecutive cubic layers and one hexagonal layer in the (ccccch)2 sequence. Here, we present the unexpected formation of a 14-layer twinned hexagonal perovskite with a stacking sequence (cccccch)2 for the BaO3 layers on the Ba14Mn1.75Ta10.5O42 (Ba8MnTa6O24) composition, the first example of twinned hexagonal perovskite with a periodicity exceeding 12-layers. The B-cation and vacancy distributions are characterized by multiple efficient and complementary techniques including neutron and synchrotron powder diffraction, scanning transmission electron microscopy-high angle annular dark field (STEM-HAADF) imaging, and electron energy loss spectroscopy (EELS) and X-ray energy dispersive spectroscopy (EDS) elemental mapping. Atomic-resolution STEM-HAADF imaging and EELS/EDS elemental mapping enables direct observation of high-spin d5 Mn2+ cation ordering in the d0 Ta5+ host, thus demonstrating the great potential of this technique for probing cation ordering and performing structure determination. Moreover, atomic mapping allows for the observation of local defect structure variants, which can be a powerful tool for future new material design. The large high-spin Mn2+ cation and Ta-vacancy pair formation in face-sharing octahedral sites play key roles on both the stabilization of this 14-layer twinned hexagonal perovskite structure and the Mn2+ ordering in the central corner-sharing octahedral (CSO) positions within the five-consecutive CSO layers. Compared with the 8-layer twinned Ba8ZnTa6O24 material, the low quality factor in microwave frequency and enhanced ultraviolet and visible light absorption of Ba14Mn1.75Ta10.5O42 as well as the photocatalytic activity on water splitting are discussed in terms of the presence of high-spin Mn2+ cations in the structure.
研究领域:
材料科学
·
结构化学
·
电子显微学
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DOI
高影响因子
JOURNAL OF CHROMATOGRAPHY B-ANALYTICAL TECHNOLOGIES IN THE BIOMEDICAL AND LIFE SCIENCES
·
2022
·
IF 3.318
Hao Wang,Xi Zhang,Yingfei Peng,Baishen Pan,Beili Wang,David Haixiang Peng,Wei Guo
Monosaccharides are important players in cell metabolism and potential biomarkers. An effective tool to quantify monosaccharides is required in basic research and healthcare. In this study, we developed a liquid chromatography-tandem mass spectrometry (LC-MS/MS) assay that could simultaneously quantify 14 free monosaccharides and evaluated its performance according to clinical guidance. The LC-MS/MS step separated and quantified 14 monosaccharides with 6 min. The coefficient of variation at the lower limit of quantification was less than 20% for each analyte. The R square values from linear regression analyses were all greater than 0.995. The validated assay was employed to profile free monosaccharides in conditioned media from cell culture and patient sera from glucose tolerance test. Both LO2 cells and HEK293 cells consumed D-glucosamine, D-glucose and produced D-glucuronic acid, N-acetyl-D-glucosamine. Additionally, LO2 cells produced D-mannose and L-fucose, whereas HEK293 cells consumed D-mannose. In patient sera from glucose tolerance test, the level of D-glucose increased significantly after glucose intake, but the levels of other monosaccharides didn’t. In conclusion, the LC-MS/MS assay we developed for 14-monosaccharide profiling met clinical requirements. The monosaccharide profiling results showed the distinct monosaccharide metabolism between liver and kidney cells, and the ignorable diet effect on 6 serum monosaccharides.
研究领域:
分析化学
·
代谢组学
·
临床医学
✓ 已验证
产品关联
DOI
PubMed
高影响因子
JOURNAL OF CHEMICAL AND ENGINEERING DATA
·
2020
·
IF 2.369
Jingping Sun,Long Wang,Shuaiwei Ding,Xiaobo Sun,Li Xu
The solubility of bisphenol A in 14 different pure solvents (N,N-dimethylformamide, formamide, acetone, 1,4-dioxane, cyclohexanone, ethyl acetate, methyl acetate, acetonitrile, ethanol, methanol, 1-propanol, 1-butanol, 2-propanol, and 2-butanol) was measured at T = (273.15–313.15) K under atmospheric pressure using a laser dynamic method. The experimental data of bisphenol A were correlated by modified Apelblat equation, λh equation, nonrandom two-liquid model and Wilson model, and the fitting results showed that the modified Apelblat equation gave the best correlation with the experimental results. The thermodynamic functions of bisphenol A in 14 pure solvents, such as dissolution enthalpy (ΔmixH), Gibbs energy (ΔmixG), and dissolution entropy (ΔmixS), were obtained from the Wilson model. The results of the ΔmixG < 0 and ΔmixH < 0 indicated that the dissolution process of bisphenol A in selected solvents was exothermic and spontaneous. The values of γ1∞ and γ1 were not close, indicating that bisphenol A in selected solvent solution systems was nonideal.
研究领域:
物理化学
·
热力学
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产品关联
DOI
高影响因子
JOURNAL OF ORGANIC CHEMISTRY
·
2021
·
IF 4.354
Qi Xia,Xiang Li,Xi Fu,Yaxuan Zhou,Yanqing Peng,Jiayi Wang,Gonghua Song
A novel three-component reaction of α-ketoaldehydes, 1,3-dicarbonyl compounds, and organic boronic acids catalyzed by CuO in water has been developed to give a wide range of products containing 1,3/1,4-diketones. The method has some advantages such as the use of readily available starting materials, wide substrate scopes, excellent yields, gram-scale synthesis, and mild reaction conditions.
研究领域:
有机化学
·
合成化学
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产品关联
DOI
PubMed
高影响因子
RSC Advances
·
2023
·Vol. 13
·期 29
·19965-19974
·
IF 3.9
Lei Sun,Zhenzhen Wang,Mengxi Zang
In view of the characteristics of high temperature denitrification and low water and sulfur resistance of single manganese-based catalysts, a vanadium–manganese-based ceramic filter (VMA(14)-CCF) was prepared by the impregnation method modified with V. The results showed that the NO conversion of VMA(14)-CCF was more than 80% at 175–400 °C. At 225–300 °C, the conversion of NO can reach 100%. High NO conversion and low pressure drop can be maintained at all face velocities. The resistance of VMA(14)-CCF to water, sulfur and alkali metal poisoning is better than that of a single manganese-based ceramic filter. XRD, SEM, XPS and BET were further used for characterization analysis. The introduction of V protects the MnOx center, promotes the conversion of Mn3+ to Mn4+, and provides abundant surface adsorbed oxygen. The development of VMA(14)-CCF greatly broadens the application range of ceramic filters in denitrification.
研究领域:
环境科学
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材料科学
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产品关联
DOI
PubMed
高影响因子
Journal of Biobased Materials and Bioenergy
·
2024
·Vol. 18
·期 3
·386-394
·
IF 0.5
He Ailing,Sun Tanglei,Wang Ruisi,Zhang Lu,Yang Yantao,Wu Qigang,Liu Peng,Lei Tingzhou
The accurate measurement of the biomass lower-calorific-value-based blending ratio (BLBR) is the premise and key to scale development of the power generation technology from co-firing of biomass and coal. However, existing determination methods of BLBR are less accurate, which has impeded
the scale utilization of the co-firing technology of biomass and coal. To accurately determine the BLBR, this research proposed a flue gas sampling system suitable for determining BLBR through 14C quantitative analysis and established a medium-scale experimental platform for BLBR
determination. In addition, predictive models for the lower calorific values of coal and biomass fuels were built and the BLBR calculation model for co-firing power plants was deduced. Furthermore, experimental verification of the BLBR determination was also conducted. The results show that
the lower calorific values of coal and biomass fuels are highly linearly positively correlated with the carbon content. The relative errors of the established prediction models for lower calorific values of biomass and coal are separately lower than 5% and 8%. The results indicate that the
proposed BLBR determination method is accurate.
研究领域:
能源与环境工程
·
可再生能源
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DOI
高影响因子
PHYCOLOGIA
·
2015
·
IF 1.915
Rui Liu,Xiaofei Ran,Fang Bai,Jinzhu Xu,Songqi Yang,Junqiong Shi,Zhongxing Wu
In order to investigate the toxicity targets of the secondary metabolite from aquatic plants, N-phenyl-2-naphthylamine, on Cylindrospermopsis raciborskii photosynthetic system II (PSII), we determined chlorophyll a (Chl a), specific growth rate (μ−d), photosynthetic rapid light curves and polyphasic Chl a fluorescence transients following exposure to N-phenyl-2-naphthylamine. The results showed significant decreases in Chl a following 48 h at high concentration (0.50 mg l−1) exposure to N-phenyl-2-naphthylamine. The PSII electron transfer rate and Chl a fluorescence transients appeared to be affected after the cells were exposed to concentrations of 0.50, 1.00 and 2.00 mg l−1. Exposure to higher concentration of N-phenyl-2-naphthylamine (> 0.50 mg l−1) mainly depressed the density of reaction centers (RC/CS0) and quantum energy flux ratios (ϕP0 and ϕE0) but increased the absorption flux per RC (ABS/RC), dissipated energy flux per RC (DI0/RC) and the average redox state of QA−/QA in the time span from 0 to tFmax (Sm/tFmax). However, exposure to low concentration (≤ 0.5 mg l−1) mainly inhibited the trapping energy fluxes per reaction center (TR0/RC), electron transport energy fluxes per reaction center (ET0/RC) and energy flux ratio (ψ0). This suggested that the donor and the acceptor sides of PSII were targets of N-phenyl-2-naphthylamine in C. raciborskii. Additionally, our results indicated that the toxicity target at low concentrations of N-phenyl-2-naphthylamine was at each step of electron transport between QA− and the Cyt b6/f complex; whereas, the reduction of QA was the potential target at high concentrations. We suggest that N-phenyl-2-naphthylamine may be a potential allelochemical to control harmful cyanobacterial blooms.
研究领域:
水生生物学
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环境科学
·
植物生理学
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DOI
高影响因子
JOURNAL OF APPLIED POLYMER SCIENCE
·
2021
·Vol. 139
·期 17
·52031
·
IF 3.125
Jianming He,Shaoying Liu,Dongliang Chen,Gongying Wang,Qingyin Wang,Yuansheng Bai
The melamine formaldehyde (MF) resin fiber has been used in various fields due to its excellent heat resistance, but it's mechanical properties still need to be improved. Using melamine and paraformaldehyde as raw materials, 1,4-cyclohexanedimethanol (CHDM) as the comonomer, a series of modified fibers with different copolymerization ratios are prepared by dry spinning. The research results show that melamine, paraformaldehyde, and CHDM can co-polymerize by one-step. The introduction of CHDM can effectively improve the heat resistance and mechanical properties of the fiber. When the addition amount of CHDM is 6%, the copolymeric fibers are cylindrical with a smooth surface and bubble-free inside, the breaking strength is 1.80 cN/dtex and the elongation at break is 13.75%. Compared with the unmodified fiber, the breaking strength is decreased by approximately 5%, and the breaking elongation is increased by nearly 90%. The thermal properties of the copolymeric fibers are not decreased, and the mass residual rate at 400°C is increased from 36.12% to 46.11%. This study provides a method of copolymeric-modified without fiber-forming aid to prepare high-performance MF fibers.
研究领域:
材料科学
·
高分子化学
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产品关联
DOI
高影响因子
INDUSTRIAL & ENGINEERING CHEMISTRY RESEARCH
·
2024
·
IF 3.8
Hongyu Qu,Xiangcheng Li,Xiao Han,Junjie Li,Xinqiang Feng,Chuang Liu,Zhendong Wang,Weimin Yang
Rational design of highly efficient non-noble-metal catalysts for the selective hydrogenolysis of biomass platform compounds to produce fuels and fine chemicals is a key pursuit for the sustainable chemical industry. In this work, we report for the first time the synthesis of a Ni-supported germanosilicate zeolite (Ni-SCM-14) catalyst by a simple grinding method, showing both satisfactory yield (90.3%) and good stability in eight cycles for the hydrogenolysis of 5-hydroxymethylfurfural (HMF) to 2,5-dimethylfuran (DMF). Characterization revealed that Ni nanoparticles were highly dispersed on the SCM-14 zeolite with strong interactions. The synergistic effect of highly dispersed Ni hydrogenation sites and the weak acidity activation of the C–O bond provided by SCM-14 is considered to be the key to the efficient hydrogenolysis of HMF. This discovery opens up a new avenue for germanosilicate zeolite to activate the C–O bond.
研究领域:
催化化学
·
生物质转化
·
材料科学
✓ 已验证
产品关联
DOI
高影响因子
CHEMICAL ENGINEERING JOURNAL
·
2023
·
IF 15.1
Xiang Li,Wei Liu,Yan Wang,Linze Lv,Huaiwei Feng,Weibo Huang,Yu Sun,Weixing Xiong,Honghe Zheng
Covalent organic frameworks (COFs) have been widely used in various fields due to their abundant elemental resources, easy structure control, and abundant tunable porous structures. COFs containing electroactive organic groups with reversible redox behavior are potential electrode materials for next-generation high-performance lithium-ion batteries (LIBs). However, the aromatic conjugated structure of the backbone moiety in most reported COFs cannot participate in redox reactions, resulting in low capacity of COFs. At the same time, the synthesis processes of COFs are usually complicated and generally requires high temperature and high pressure. On this basis, an imine bond-rich COF (TAACOF) with reversible Li-ion bonding is developed, which has the advantages of facile preparation and low energy consumption. In particular, the lone pair electrons of the N atom in the imine bond can induce lithium ions to combine with the aromatic conjugated structure, which greatly improves the capacity of the TAACOF electrode. After 800 cycles, the active sites of the TAACOF are fully activated, and after a 14-electron redox reaction, the specific capacity can reach as high as 1035.7 mAh/g.
研究领域:
材料科学
·
电化学
·
储能
·
有机化学
·
纳米技术
✓ 已验证
DOI
高影响因子
危险品化学品经营许可证（带存储）