Molecular Catalysis
·
2023
·
IF 4.6
Xiaozhong Wang,Jiali Hu,Cai Xu,Yingqi Chen,Liyan Dai
Herein, a series of NiCu/Al 2 O 3 catalysts were prepared by impregnation method and subsequent thermal treatment under different reduction temperatures. The catalysts exhibited excellent catalytic activity for the amination of diethylene glycol (DEG), and satisfactory yield of tertiarybutylaminoethoxyethanol (TBEE) could be obtained. XRD, N 2 adsorption-desorption, SEM, TEM, XPS, and H 2 -TPR were employed to characterize the catalysts, the interaction between Ni and Cu on the catalytic activity was studied. It was found that NiCu alloy was formed after catalyst reduction, which strengthened the reduction ability of NiO and increased the number of Ni 0 active center, contributing to the enhanced catalytic activity. Moreover, the effects of reaction parameters on catalytic activity were explored. There was no need for a solvent, only 3 molar equivalents of tert‑butylamine (TBA) and 1 wt.% catalyst was required. After 7 h of reaction at 220 °C, satisfactory conversion (89.6%) and selectivity (84.6%) were obtained over the prepared catalyst. Cycle experiment demonstrated that the prepared catalyst retained excellent stability and reusability after six runs without significant loss of catalytic activity. This work provided an efficient catalyst for the catalytic amination of diethylene glycol with tert‑butylamine to TBEE.
研究领域:
化学工程
·
催化科学
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DOI
高影响因子
Separations
·
2025
·Vol. 12
·期 5
·106
·
IF 2.7
Xiaoyun Guo,Junli Wang,Yao Liu,Haojun Zhao,Hui Wang,Wentao Wang,Baole Li,Taihong Yan
Developing a new efficient separation ligand based on the “CHON” principle to address the limitations of phosphorus containing extractants in nuclear fuel reprocessing can help further simplify the process flow and reduce the amount of secondary waste. Building upon this critical need, a novel ligand was developed through a strategic application of the Hard and Soft Acids and Bases (HSAB) theory, integrating a soft donor nitrogen atom into the linear architecture of bis-diglycolamide. This groundbreaking ligand, named N,N′-bis[2-(2-(N,N-dioctylcarbamoyl)ethoxy)ethylacetamido]-N″-diethylenetriamine (TOMDEA-BisDGA), has demonstrated remarkable potential in the extraction of Pu(IV). The study unveils that the ligand demonstrates remarkable selectivity and separation efficiency towards Pu(IV) ions while maintaining an exceptionally low extraction capacity for U(VI) across a wide acidity spectrum of 0.1~6 mol/L. To explain the structure properties of complex formed by the ligand and Pu(IV), a systematic analysis was performed, including slope analysis, proton nuclear magnetic resonance (NMR) titration, and Fourier-transform infrared (FT-IR) spectroscopy. This study explores the coordination and separation behavior of diglycolamide ligands with actinide. This work is expected to provide important information and theoretical bases upon which advanced design and optimization of ligands for high-performance processes for the separation of plutonium might be carried out. Such findings will contribute to the understanding of actinide chemistry and further the design of improved separation methods for nuclear applications.
研究领域:
核化学
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配体设计
·
放射化学
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DOI
高影响因子
JOURNAL OF CHEMICAL THERMODYNAMICS
·
2021
·
IF 3.178
Yueyang Jiang,Song Lin,Houchun Yan,Hongyue Guo,Qingsong Li
Liquid-liquid equilibrium (LLE) data for water + diethylene glycol dimethyl ether + {methyl isobutyl carbinol, methyl isobutyl ketone, methyl isopropyl ketone, methyl tert -butyl ether, n -octanol and 2-ethyl-1-hexanol} was measured at 298.2 K under 101.3 kPa. The effect of separating diethylene glycol dimethyl ether from water is evaluated by the distribution coefficient and the separation coefficient. The Othmer-Tobias and Hand equations were chosen to examine the experimental LLE data. Meanwhile, the data was correlated by the NRTL and UNIQUAC thermodynamic models with AAD % less than 0.55 and RMSD % less than 0.77. The separation performance of six solvents was compared using the σ -profile analysis via the exploration of the intermolecular interaction.
研究领域:
化学工程
·
物理化学
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DOI
高影响因子
JOURNAL OF APPLIED POLYMER SCIENCE
·
2021
·Vol. 139
·期 15
·51921
·
IF 3.125
Hongxu Meng,Zhisong Li,Linbo Wu,Bo-Geng Li,Yumiao Hu,Kecheng Wang
Poly(ethylene 2,5-furandicarboxylate) (PEF) is a biobased polyester with high gas barrier properties, tensile modulus, and strength. In PEF chain, in addition to ethylene furandicarboxylate repeat unit, there is also a small amount of diethylene glycol furandicarboxylate (DF) unit which is formed by etherification side reactions. However, the effect of DF unit in a wide composition range on polymer properties is still unclear. In this study, random poly(ethylene-co-diethylene glycol 2,5-furandicarboxylate) (PEDF) copolymers were synthesized via melt copolycondensation of 2,5-furandicarboxylic acid, ethylene glycol and diethylene glycol. The copolymers were characterized and evaluated by intrinsic viscosity, 1 H NMR, thermal transition, thermogravimetric analysis, tensile, impact, and O 2 penetration tests. The copolymers are amorphous in the full composition range. The presence of less than 58 mol% DF unit in PEDFs neither improves the tensile ductility nor deteriorates the oxygen barrier performance, but reduces the glass transition temperature clearly. In comparison with poly(ethylene terephthalate), the PEDF copolymers containing <58 mol% DF unit have higher tensile modulus, strength, and O 2 barrier properties.
研究领域:
材料科学
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高分子化学
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DOI
高影响因子
CELLULOSE
·
2019
·Vol. 26
·期 18
·9889-9899
·
IF 3.917
Tian Peixiu,Liu Mingsheng,Wan Caiyan,Zhang Guangxian,Zhang Fengxiu
Abstract A flame retardant ammonium salt of diethylene glycol phosphonate (ADGP) is synthesized using low-cost materials (diethylene glycol, phosphoric acid, and urea). The flame retardant is grafted on the cotton fabrics via P–O–C covalent bonds. The structure of the flame retardant is characterized by nuclear magnetic resonance (NMR) and Fourier transform infrared (FT-IR). The combustion performance of the treated and untreated cotton fabrics is evaluated based on vertical flammability, limiting oxygen index (LOI), and cone calorimetry. As the concentration of the flame-retardant ADGP increased, the cotton fabric treated with 40% ADGP exhibited an LOI of 43.7% and superior fire resistance, whereas physiological comfort showed a decrease. Scanning electron microscopy, energy dispersive X-ray spectroscopy, and X-ray diffraction were used to characterize the surface morphology, chemical composition, and crystal structure of the control and treated cotton fabrics. The thermal stability of the treated and untreated cotton fabrics is determined by thermogravimetric analysis. The results indicated that the treated cotton showed superior flame retardancy. Graphic abstract
研究领域:
材料科学
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纺织工程
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DOI
高影响因子
CHINESE CHEMICAL LETTERS
·
2017
·
IF 1.932
Lin Liu,Xiang-Mei Yu,Bao Zhang,Shu-Xian Meng,Ya-Qing Feng
The performance of dye-sensitized solar cells (DSSCs) consisting of anatase TiO 2 nanoparticles that were synthesized via a hydrothermal method was studied. The synthesized TiO 2 nanoparticles were characterized by X-ray diffraction (XRD), nitrogen sorption analysis, scanning electron microscopy (SEM), high resolution transmission electron microscopy (HRTEM), and UV–vis spectroscopy. Then the J - V curve, electrochemical impedance spectroscopy (EIS), and open-circuit voltage decay (OCVD) measurement were applied to evaluate the photovoltaic performance of DSSCs. Compared with the commercial TiO 2 nanoparticles (P25), the synthesized-TiO 2 nanoparticles showed better performance. By adding diethylene glycol (DEG) before the hydrothermal process, the synthesized TiO 2 nanoparticles (hereafter referred to as TiO 2 -DEG particles) shows narrower size distribution, larger specific surface area, higher crystallinity, and less surface defects than TiO 2 (DEG free) particles. The analysis of photovoltaic properties of DSSCs based on TiO 2 -DEG particles showed that the recombination of electron-hole pairs was decreased and the trapping of carries in grain boundaries restrained. It was believed that the photoelectrode fabricated with the as-prepared TiO 2 nanoparticles improved the loading amount of dye sensitizers (N719), and enhanced the photocurrent of the DSSCs. As a result, the TiO 2 -DEG particle based cells achieved a photo-to-electricity conversion efficiency ( η ) of 7.90%, which is higher than 7.53% for the cell based on TiO2 (DEG free) and 6.59% for the one fabricated with P25.
研究领域:
材料科学
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能源科学
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DOI
高影响因子
Journal of CO2 Utilization
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2023
·
IF 7.7
Peilin Li,Jing Zhong,Wenzhong Ma,You Zhang,Xiuxiu Ren,Meng Guo,Yongfei Zhu
Carbon monoliths have the advantages of good heat resistance and no need for molding during use. However, in practical applications, due to its low strength, it often suffers from wear and breakage during multiple adsorption-desorption cycles, which is not conducive to CO 2 adsorption. Pyrogallol and formaldehyde-based polymers were used as carbon precursors, triblock copolymer Pluronic F127 was used as a structural directing agent, and diethylene glycolamine (DGA) as both the polymerization crosslinking agent and structural assembly promoter. In the presence of DGA, the solution can quickly gel within 15–20 min at 90 °C. No catalyst required, no environmental pollution, low cost, and mild reaction. Hydrogen bond interaction and poly(benzoxazine-co-resol) self-assembly synthesized homogeneous and crack-free polymer monoliths. A sturdy framework of carbon monoliths was obtained by adjusting the content of DGA and carbonization temperature. The kind of carbon monolith not only has a fully interconnected mesoporous structure and maintains good shape even after being magnified three times. The tight network skeleton enables it to have good mechanical strength and withstand a pressure of 8.1 MPa, which is 41 times greater than that of nano-casting and soft template carbon monoliths (0.19 and 0.2 MPa). The presence of nitrogen-containing groups and pore structures gives it good CO 2 capture ability (0.9–2.8 mmol/g, 1 bar, 298 K), superior to the regular mesoporous carbon prepared by soft and hard template methods (1.5 and 1.7 mmol/g). Meanwhile, it exhibits high selectivity for capturing CO 2 over N 2 from a 15% (v%) CO 2 /N 2 mixture. They undergo a facile CO 2 release in an argon stream at 25 °C, indicating a good regeneration capacity. After five testing cycles, the carbon monolith still maintained good adsorption and separation performance, with adsorption capacity maintained at 98–100% of the initial adsorption capacity.
研究领域:
材料科学
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环境科学
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产品关联
DOI
高影响因子
INDUSTRIAL & ENGINEERING CHEMISTRY RESEARCH
·
2014
·
IF 2.235
Yong Liu,Yitao Wang,Cuiping Zhai,Weiping Chen,Congzhen Qiao
Novel heteropolyanion-based ionic liquids (HPA-ILs) were obtained by combining Keggin heteropolyanions and organic cations and used as catalysts for an esterification reaction. The kinetic behaviors in the esterification of diethylene glycol monobutyl ether (DGBE) with acetic acid in the presence of HPA-ILs as catalysts were investigated systemically. Different types of HPA-ILs were used for the esterification of DGBE. Compared with H2SO4, H3PW12O40, and Amberlyst-15 resins, [BSEt3N]3PW12O40 and [BSmim]3PW12O40 exhibited excellent catalytic activities. The influences of reaction temperature, catalyst dosage, and reactant molar ratio on the conversion of DGBE were studied in detail. The kinetic data were successfully correlated by a pseudohomogeneous (PH) model in the temperature range of 343.15–363.15 K. The simulation values obtained by the kinetic model were in good agreement with the experimental data. Moreover, [BSEt3N]3PW12O40 and [BSmim]3PW12O40 could be easily recovered and reused six times without any obvious decrease in catalytic activity.
研究领域:
化学工程
·
催化科学
✓ 已验证
DOI
高影响因子
DESALINATION
·
2025
·
IF 9.8
Xinxia Tian,Jian Wang,Yangyang Wei,Lei Tian,Yang Yang,Yan Jin,Zhaokui Li
The intrinsic structure of the polyamide separation layer fundamentally governs the performance of reverse osmosis (RO) membranes. In this study, environmentally friendly diethylene glycol dimethyl ether (DEGDME) was used as co -solvent to modulate the interfacial polymerization process and subsequently regulate the structure of the separation layers. Small-angle X-ray scattering (SAXS), alongwith conventional methods, was utilized to investigate the multi-scale structure of the separation layers, including morphology and aggregation at the nanometer scale. The fractal dimension ( P 2 ) derived from SAXS exhibited a strong linear relationship with the water permeability coefficient A ( R 2 = 0.9984), and an exponential relationship with NaCl permeability coefficient B ( R 2 = 0.9265) when the DEGDME content was not exceed 0.5 wt%. At a DEGDME content of 0.3 wt%, the water flux of the RO membrane reached 69.8 L·m −2 ·h −1 , exhibiting a 105.3 % increase compared to the original membrane, with no significant loss in NaCl rejection. Additionally, the RO membrane M-0.3 demonstrated excellent antifouling properties and long-term operational stability. Given the simplicity and efficacy of the co-solvent regulation method, it holds significant potential for practical applications.
研究领域:
材料科学
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环境科学
·
化学工程
✓ 已验证
产品关联
DOI
高影响因子
JOURNAL OF APPLIED POLYMER SCIENCE
·
2024
·
IF 2.7
Zhisong Li,Linbo Wu
Poly(ethylene 2,5-furandicarboxylate) (PEF) is an important biobased polyester with better thermal, mechanical, and gas barrier properties than poly(ethylene terephthalate). In PEF synthesis, diethylene glycol furandicarboxylate (DF) is inevitably formed via etherification side reaction. Taking advantage of the side reaction, poly(ethylene-co-diethylene furandicarboxylate) (PEDF) poly(ether-ester)s were synthesized only from 2,5-furandicarboxylic acid (FDCA) and ethylene glycol (EG), using a cheap binary propanedisulfonic acid/dibutyltin oxide (PSA/DBTO) catalyst. The polymers were characterized by 1 H NMR, intrinsic viscosity, solubility, differential scanning calorimetry, thermogravimetric analysis, tensile, and gas barrier test. Due to strong acidity of PSA, not only major DF but also minor oligoethylene glycol furandicarboxylate ether-containing units were formed. Their total content can be adjusted up to 78 mol% by simply increasing the dosage of PSA from 0 to 0.4 wt%. The effect of ether-containing units on the solubility, thermal transition, mechanical, and oxygen barrier properties of the poly(ether-ester)s were examined and compared with the poly(ether-ester)s synthesized via copolycondensation.
研究领域:
材料科学
·
化学工程
✓ 已验证
产品关联
DOI
高影响因子
LANGMUIR
·
2017
·
IF 3.833
Lan Ma,Hui Tang,Peiyi Wu
The microdynamic volume phase transition mechanism of poly[di(ethylene glycol)ethyl ether acrylate] (PDEGA)-based microgels with newly developed thermoresponsive polyionic liquid (PIL) (poly(tetrabutylphosphonium styrenesulfonate) P[P4,4,4,4][SS]) moieties was studied by applying temperature-variable Fourier transform infrared (FTIR) spectroscopy in combination with two-dimensional correlation spectroscopy (2Dcos) and the perturbation correlation moving window (PCMW) technique. It can be found that the content of hydrophilic PIL moieties plays a significant role in the thermally induced phase transition behavior of microgel systems; namely, the microgels containing fewer PIL moieties present a sharp transition behavior and a gel-like state (10%, w/v) in water whereas the microgels with more PIL moieties undergo a slightly broad phase transition process and a flowable solution state. Herein, the C═O···D2O-PIL hydrogen bonds as the interaction between PDEGA and P[P4,4,4,4][SS] moieties result in a complete dehydration process for the microgels with fewer PIL moieties and the dehydrated behavior of SO3– groups acts as the driving force during the phase transition. As for the microgels with more PIL moieties, the whole transition process is dominated by the hydrophobic interaction of C–H groups. Even though the intermolecular hydrogen bonds (C═O···D2O-PIL) appear as well, the more remarkable effect of the Coulombic repulsive force of PIL restrains the water molecules from breaking away, thus causing a gradual and incomplete dehydration process during heating.
研究领域:
材料科学
·
化学
✓ 已验证
产品关联
DOI
PubMed
高影响因子
THERMOCHIMICA ACTA
·
2018
·
IF 2.189
Huan-bing Liu,Dong-fang Pei,Sai Chen,Rui-rui Cao,Xing-xiang Zhang
A novel form-stable phase change material (FSPCM), namely, diethylene glycol hexadecyl ether-grafted graphene oxide (E 2 C 16 - g -GO), was fabricated by an esterification reaction. As E 2 C 16 was modified with GO for the first time, the optimal E 2 C 16 and GO reactant ratio and reaction time were determined to be 6:1 and 6 h, respectively. The successful synthesis and chemical structure of E 2 C 16 - g -GO were confirmed by various spectroscopy and microscopy techniques. The thermal properties and stability of E 2 C 16 - g -GO were characterized by DSC and TGA. The melting and crystallization points of E 2 C 16 - g -GO are 43.3 °C and 29.4 °C, respectively. The latent heats of melting and crystallization are 70 and 72 J/g, respectively. The degradation temperature of E 2 C 16 - g -GO is approximately 20 °C higher than that of E 2 C 16 , indicating that it has good thermal stability. Furthermore, E 2 C 16 - g -GO exhibits good shape-stability and excellent thermal reliability and structural stability, indicating that it is a promising FSPCM for energy storage applications.
研究领域:
材料科学
·
能源存储
✓ 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）