Journal of CO2 Utilization
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2022
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IF 8.321
Haolin Du,Yifei Ye,Ping Xu,Jianmin Sun
The development of novel and efficient catalysts for the cycloaddition of CO 2 -epoxide has attracted the interest of researchers. In this work, a series of dicationic vinyl-functionalized imidazolium ionic liquids (ILs) were prepared, then polymerized and further copolymerized with 1,4-divinylbenzene (DVB) by free radical reaction. The synthesized PIL-DVB-IV catalyst presented 93% yield and 99% selectivity to the product of propylene carbonate under the optimized reaction conditions of 110 °C, 2.0 MPa for 6 h. Besides, the PIL-DVB-IV catalyst exhibited excellent recyclability and generality to various epoxides. The potential energy surface of the catalytic reaction was given by the computation of Density Functional Theory (DFT), which further revealed the proton migration catalytic mechanism of PIL-DVB-IV catalyst. The kinetic process of the catalyst was illustrated through the study of catalytic reaction kinetics and the calculation of DFT.
研究领域:
材料科学
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催化化学
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理论计算化学
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DOI
高影响因子
Soft Matter
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2015
·Vol. 11
·期 26
·5253-5264
·
IF 4.029
Ge Wang,Peiyi Wu
The temperature-induced phase transition behaviors of a thermoresponsive ionic liquid (tributylhexylphosphonium 3-sulfopropylmethacrylate, [P4,4,4,6][MC3S]) and its polymer (poly-tributylhexylphosphonium 3-sulfopropylmethacrylate, P[P4,4,4,6][MC3S]) have been investigated using DSC, optical microscopy, temperature-variable 1H NMR, and FT-IR in combination with two-dimensional analysis methods, including perturbation correlation moving window (PCMW) and two-dimensional correlation spectroscopy (2Dcos). We found that there exists a distribution gradient of water molecules in P[P4,4,4,6][MC3S] ranging from hydrophobic backbones to hydrophilic sulfonates. Linked together by covalent bonds, P[P4,4,4,6][MC3S] would form an “urchin-like” structure, which can improve its stability and strengthen the gradient distribution of water. Finally, 2Dcos was employed to elucidate the sequential order of chemical group motions during heating. It is concluded that both [P4,4,4,6][MC3S] and P[P4,4,4,6][MC3S] experience the anionic dominated phase transition process. Moreover, the driving force for the phase transitions is shown to be the dehydration of hydrophobic ester carbonyls.
研究领域:
物理化学
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材料科学
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DOI
PubMed
高影响因子
Advanced Materials Interfaces
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2022
·Vol. 9
·期 13
·2102570
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IF 6.389
Hua-Li Wang,Yi-Xin Wang,Ze-Hui Liang,Hao-Cheng Yang,Zhi-Kang Xu
Slippery liquid-infused porous surfaces have received great attention in anti-adhesion applications, and ionic liquids are selected as the infiltrated liquid in recent research due to their non-volatility. Beyond the complicated steps, infiltrating the viscous ionic liquid within a porous structure is challenging during the conventional fabrication process. Herein, a facile method is proposed to fabricate polyurethane-based slippery ionic-liquid-infused coatings in one step through a phase separation process. The solid structure grows from the ionic liquid through a liquid–liquid phases separation process. The coatings perform excellent anti-bacterial and anti-icing properties owing to the biocide nature, lubricity, and low freezing point of ionic liquids.
研究领域:
材料科学
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化学工程
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表面工程
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生物医学工程
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DOI
高影响因子
INDUSTRIAL & ENGINEERING CHEMISTRY RESEARCH
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2015
·
IF 2.587
Zhenghai Tang,Jing Huang,Xiaohui Wu,Baochun Guo,Liqun Zhang,Fang Liu
In silica-filled rubber composites, the silanization modification of silica plays a vital role in enhancing the compatibility between silica and a rubber matrix and hence the properties of the composites. In the present study, with the goal of promoting silanization reactivity and extent, we utilize a phosphonium ionic liquid (PIL) as a novel catalyst for the silanization reaction between silica and bis(3-triethoxysilylpropyl)-tetrasulfide (TESPT), a commonly used silane in the tire industry, in the styrene–butadiene rubber (SBR) matrix. Dynamic rheological measurement, bound rubber measurement, freezing point depression, and heat capacity increment together show that the addition of a small amount of PIL into a TESPT-modified SBR/silica composite gives rise to significant improvement in the interfacial adhesion between silica and the rubber matrix, which is on account of the promoted silanization extent of silica with the catalyst of PIL. Consequently, the resulting composite prepared at room temperature with fewer parts of TESPT exhibits superior overall performance in comparison with the composites prepared by adding excessive TESPT and compounding at an elevated temperature. In particular, the energy loss during rolling of the rubber wheel is drastically decreased as a result of the improved interfacial silanization, which shows great potential in energy-saving green tires.
研究领域:
材料科学
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化学工程
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DOI
高影响因子
JOURNAL OF MOLECULAR LIQUIDS
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2016
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IF 2.74
Dongren Cai,Jinbei Yang,Hairong Da,Ling Li,Hongxing Wang,Ting Qiu
Densities, ρ and viscosities, η of N , N -dimethyl-N-(3-sulfopropyl)cyclohexylammo-nium tosylate ([CyN 1,1 PrSO 3 H][Tos]) with water and methanol were measured, at temperatures from 303.15 K to 328.15 K with 5 K interval and 0.1013 MPa, as a function of [CyN 1,1 PrSO 3 H][Tos] molality (or mass fraction). The isobaric thermal expansion coefficient , molecular volume, standard molar entropy, and lattice energy of the pure IL were obtained based on the density data of pure IL . The apparent molar volume , V φ , infinite dilution apparent molar expansibility, E φ ∞ and energy barrier, E were calculated from the experimental data. The Redlich-Mayer equation was used to evaluate infinite dilution apparent molar volume , V φ ∞ . In addition, viscosities can be described satisfactorily by Vogel-Fulcher-Tammann (VFT) equation. The V φ ∞ values of the IL in water are higher than those in methanol, which suggests that the ion-solvent interactions for [CyN 1,1 PrSO 3 H][Tos] + water binary system are stronger than those for [CyN 1,1 PrSO 3 H][Tos] + methanol. And the energy barrier values decrease with the drop of IL mass fraction in both systems, indicating that the viscosity changes of binary mixtures are more sensitive to the temperature at high composition of the IL.
研究领域:
物理化学
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材料科学
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DOI
高影响因子
INDUSTRIAL & ENGINEERING CHEMISTRY RESEARCH
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2016
·
IF 2.567
Yajuan Wu,Zhen Li,Chungu Xia
The supported ionic liquids were prepared by anchoring 3-sulfobutyl-1-(3-propyltriethoxysilane) imidazolium hydrogen sulfate onto silica gel of different types. The properties of the catalysts were characterized by elemental analysis, Fourier transform infrared (FT-IR) spectra, scanning electron microscopy (SEM), thermogravimetry/differential scanning calorimetry (TG/DSC), and X-ray photoelectron spectroscopy (XPS). The catalytic activities of both the immobilized ionic liquids and the free one (1-butylsulfonate-3-methylimidazolium bisulfate, [MIM-BS][HSO4–]) were investigated by the synthesis of polyoxymethylene dimethyl ethers (DMMn) from methylal (DMM) and trioxane (TOX), which suggested that all covalently anchored ionic liquids have better catalytic effects than [MIM-BS][HSO4–]. The optimization experiment of catalyst dosage demonstrated that the acid amount of ionic liquid is a major factor for the catalytic activity.
研究领域:
化学工程
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催化科学
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DOI
高影响因子
MAGNETIC RESONANCE IN CHEMISTRY
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2017
·Vol. 56
·期 2
·73-79
·
IF 1.601
Xiaochen Tang,Yingjie Xu,Xiao Zhu,Yueqing Lu
In this work, changes in microstructure of two protic ionic liquids (PILs), namely n -butylammonium acetate (N4Ac) and n -butylammonium nitrate (N4NO 3 ), are proved by in situ variable-temperature 1 H NMR spectroscopy at the temperature range from 25 to 115 °C, and the influence of the nature of anion is discussed accordingly. The results demonstrate that 1 H NMR chemical shifts of alkyl protons of both N4Ac and N4NO 3 are almost not changed with the increasing of temperature, due to the absence of hydrogen bond interaction between alkyl protons with anions. Whereas those of + N―H of cation decrease linearly with the temperature increasing, indicating that the hydrogen bond interaction between + N―H and anion weakens gradually. In addition, the strength of hydrogen bond interaction between + N―H and NO 3 − is stronger than that between + N―H and Ac − , suggesting that anions have a significant influence on microstructure due to the acidity of a Brønsted acid. Consequently, the proton transfer from cation to anion is much easier in N4Ac compared to N4NO 3 . Further analyses of 1 H NMR chemical shifts of + N―H in N4Ac at the temperature range from 100 to 115 °C suggest that the splitting of + N―H peak may be attributed to obvious evidence of the existence of the proton transfer from + N―H to Ac − , which leads to dissociate the contact ion-pair in N4Ac to form the neutral ion-pair ‘molecule’. The results will help us to extensively understand the behavior of proton transfer and offer us some valuable information for the design of PILs. Copyright © 2017 John Wiley & Sons, Ltd.
研究领域:
化学
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材料科学
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DOI
PubMed
高影响因子
HYDROMETALLURGY
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2019
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IF 3.465
Zhenning Lou,Mengnan Huang,Junshuo Cui,Shuyao Wu,Shanshan Xing,Peng Zhou,Weijun Shan,Ying Xiong
Technetium ( 99 Tc), a radionuclide generated from uranium fission in nuclear reactors, has posed a major threat to humans due to its long half-life and radioactivity. Therefore, it is urgent to develop a strategy of selectively and efficiently capturing of 99 Tc. In this work, a series of solid copolymers (denoted as DVB-[C x ClVim][Cl]) were synthesized for efficient adsorption of perrhenate (ReO 4 − , a surrogate for TcO 4 − ) from mixed ions solution. The adsorbents with vinylimidazolium-based ionic liquid as functional group and divinylbenzene (DVB) as the basic framework exhibited stable structure and good ReO 4 − adsorption performance. The influences of the linear n-alkyl chain length on the morphology and adsorption property of the copolymers were discussed in detail. The maximum uptake of Re(VII) on DVB-[C 4 ClVim][Cl] was 517.61 mg·g −1 . Rhenium could be separated from molybdenum in the presence of co-anions and co-cations by DVB-[C 6 ClVim][Cl], which demonstrated its good adsorption selectivity . The kinetic studies showed that pseudo-second-order model was more suitable for describing the behavior of Re(VII) adsorption. The adsorption mechanism was ion-exchange between Cl − and ReO 4 − confirmed by FI-IR, IC and XPS analysis. Additionally, DVB-[C x ClVim][Cl] remained effective Re(VII) capture ability after eight adsorption/elution cycles, demonstrating their good reusability.
研究领域:
环境科学
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材料科学
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放射化学
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DOI
高影响因子
FUEL
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2012
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IF 3.248
Cun Zhang,Xiaoyu Pan,Feng Wang,Xiaoqin Liu
The Brönsted acidic ionic liquids N-carboxymethylpyridine hydrosulphate ([CH 2 COOHPy][HSO 4 ]) and N-carboxyethylpyridine hydrosulphate ([(CH 2 ) 2 COOHPy][HSO 4 ]) were synthesized and used as the extractant and catalyst for the extraction–oxidation desulfurization of model oil. The structures of the ILs were confirmed by 1 H NMR and 13 C NMR. The density, viscosity and acid strength of the ILs were also investigated. The acid strength was in order of H 2 SO 4 (98%) > [CH 2 COOHPy][HSO 4 ] > [(CH 2 ) 2 COOHPy][HSO 4 ]. The [CH 2 COOHPy][HSO 4 ] showed better activity during the removal of dibenzothiophene (DBT) in n -octane by a combination of extraction and oxidation, and the sulfur removal reached 99.9% under the conditions of V model oil = 20 mL, V IL = 1.2 mL, T = 30 °C and H 2 O 2 /S molar ratio (O/S) = 6. In the same conditions, the removal of benzothiophene (BT) and 4,6-dimethyldibenzothiophene (4,6-DMDBT) by using [CH 2 COOHPy][HSO 4 ] reached 82.5% and 89.1%, respectively. Ionic liquid [CH 2 COOHPy][HSO 4 ] can be recycled 9 times without a significant decrease in the sulfur removal.
研究领域:
化学工程
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环境科学
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DOI
高影响因子
SEPARATION AND PURIFICATION TECHNOLOGY
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2015
·
IF 3.091
Guangren Yu,Lin Zhang,Ibrahim A. Alhumaydhi,Ahmed A. Abdeltawab,Abdulaziz A. Bagabas,Hamid A. Al-Megren,Salem S. Al-Deyab,Xiaochun Chen
Ionic liquids (ILs) coupled with Ag + or Cu + salts to form a new kind of reactive absorbent have been studied to separate light olefin from paraffin recently. In this work, we prepared two halogen-free alkylimidazolium thiocyanate ILs with cheaper cuprous thiocyanate, i.e., [Bmim]SCN–CuSCN and [Emim]SCN–CuSCN (Bmim, 1-butyl-3-methylimidazolium; Emim, 1-ethyl-3-methylimidazolium) and investigated their absorption capability for propylene, propane and mixture of both at 1–7 bar and 298–318 K. The effects of operating parameter including cation nature, temperature, pressure, Cu + concentration and reuse of absorbent were investigated. Propylene shows a chemical absorption while propane does a physical one, and increasing Cu + concentration effectively improves the absorption capability for propylene and the selectivity of propylene/propane. [Bmim]SCN–CuSCN has higher absorption capability and selectivity for propylene than [Emim]SCN–CuSCN, e.g., [Bmim]SCN–CuSCN-1.5 M can absorb 0.12 mol of propylene per liter while 0.012 mol of propane per liter at 1 bar and 298 K, with a selectivity of 10, which is comparable to some other ILs-Ag + salts and better than pure ILs. Such absorbents can be regenerated through temperature and pressure swing without remarkable activity loss. This work shows that alkylimidazolium thiocyanate ILs with Cu + salts are promising reactive absorbents to separate propylene from propane.
研究领域:
化学工程
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材料科学
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产品关联
DOI
高影响因子
HYDROMETALLURGY
·
2022
·
IF 4.217
Xiayu Liang,Qingle Zeng
Samarium (Sm), as one of the lanthanide elements, has a broad application prospect in the synthesis of samarium cobalt permanent magnet materials with high temperature stability, corrosion resistance and oxidation resistance . Due to the unlimited demand of Sm(III), recycling of Sm(III) waste is an effective method to balance economy and supply. In this paper, three novel morpholine carboxylic acid ionic liquids (ILs) were rationally designed and successfully synthesized for the extraction of Sm(III). The effects of alkyl chain length of the ionic liquids, solution acidity, contact time, extractant concentration and temperature were tested in terms of the extraction performances. The results revealed that [(CH 2 ) 7 COOHmor][NTf 2 ] had the optimal extraction capacity, as well as the extraction efficiency of Sm increased with the increase of pH, reaching >99.9% when the pH was 1.8. In addition, the extraction equilibrium could be achieved within 1 min. Moreover, the slope analysis and FTIR spectral studies proposed a cation exchange extraction mechanism for Sm(III) by [(CH 2 ) 7 COOHmor][NTf 2 ]. The loaded Sm(III) in organic phase was easy to strip with 0.05 mol/L of HNO 3 , and the [(CH 2 ) 7 COOHmor][NTf 2 ] remained stable after 5 cycles. The research of transition metal extraction revealed that Sm(III) could be selectively separated from Ni(II) and Co(II) by adjusting the pH value of the solution. Finally, under the optimized extraction conditions, Sm 2 O 3 with 83.9% yield was obtained by the extraction-stripping-precipitation-calcination process, through the large-scale recovery applications of the simulated waste liquid .
研究领域:
化学工程
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材料科学
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DOI
高影响因子
CHEMICAL PAPERS
·
2025
·
IF 2.5
Kong Weizhen,Mao Jiaming,Peng Qianqian,Qin Shucan,Shi Longmei,Wu Anshuang,Xu Shengyun,Shi Jianming,Liu Yanrong,Ma Yunqian
High-value-added sulfur products as well as hydrogen (H 2 ) can be obtained by electrolytic oxidation of hydrogen sulfide (H 2 S), which is a promising energy conversion technology that contributes to the resource utilization of the pollutants. In conventional sulfide oxidation reaction (SOR), the recovery of the anodic product typically requires additional acidification treatment, resulting in the unsustainable use of electrolyte. Here, a novel H 2 S direct electrolysis system with ionic liquid (IL)-based electrolyte, consisting of acetate-based ILs and NaOH aqueous solution, was investigated. Compared to single NaOH aqueous solution, [Hmim]Ac-based electrolyte showed high H₂S absorption capacity and best electrochemical performance for SOR. Significantly, the anodic sulfur product was proved to be α-sulfur, which could be self-precipitated from the electrolyte without extra acid. The [Hmim]Ac-based electrolyte has the highest equilibrium solubility of sulfur (30.8 g L −1 ), which was 2–3 times that of the conventional electrolyte of NaOH aqueous solution. It is mainly attributed to the synergistic coupling of ILs and NaOH for H 2 S absorption and the modulating effect of ILs. Under constant potential electrolysis at 1.2 V vs RHE in [Hmim]Ac-based electrolyte, the maximum current density reached 194.4 mA cm −2 , the maximum hydrogen production rate reached 3945 μmol h −1 , the Faraday efficiency reached 97.9%, and the sulfur recovery of 82.6%. The IL-based electrolyte can be reused for at least three cycles of absorption-electrolysis, holding promise for efficient and continuous electrolysis of H 2 S. Graphical abstract
研究领域:
能量转换
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电化学
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环境可持续性
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化学工程
·
绿色技术
✓ 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）