TALANTA
·
2010
·
IF 3.29
Huan Zeng,Yuzhi Wang,Jinhuan Kong,Chan Nie,Ya Yuan
An ionic liquid-based microwave-assisted extraction (ILMAE) method has been developed for the effective extraction of rutin from Chinese medicinal plants including Saururus chinensis (Lour.) Bail. (S. chinensis) and Flos Sophorae. A series of 1-butyl-3-methylimidazolium ionic liquids with different anions were investigated. The results indicated that the characteristics of anions have remarkable effects on the extraction efficiency of rutin and among the investigated ionic liquids, 1-butyl-3-methylimidazolium bromide ([bmim]Br) aqueous solution was the best. In addition, the ILMAE procedures for the two kinds of medicinal herbs were also optimized by means of a series of single factor experiments and an L 9 (3 4 ) orthogonal design. Compared with the optimal ionic liquid-based heating extraction (ILHE), marinated extraction (ILME), ultrasonic-assisted extraction (ILUAE), the optimized approach of ILMAE gained higher extraction efficiency which is 4.879 mg/g in S. chinensis with RSD 1.33% and 171.82 mg/g in Flos Sophorae with RSD 1.47% within the shortest extraction time. Reversed phase high performance liquid chromatography (RP-HPLC) with ultraviolet detection was employed for the analysis of rutin in Chinese medicinal plants. Under the optimum conditions, the average recoveries of rutin from S. chinensis and Flos Sophorae were 101.23% and 99.62% with RSD lower than 3%, respectively. The developed approach is linear at concentrations from 42 to 252 mg L −1 of rutin solution, with the regression coefficient ( r ) at 0.99917. Moreover, the extraction mechanism of ILMAE and the microstructures and chemical structures of the two researched samples before and after extraction were also investigated. With the help of LC–MS, it was future demonstrated that the two researched herbs do contain active ingredient of rutin and ionic liquids would not influence the structure of rutin.
研究领域:
药学
·
分析化学
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DOI
高影响因子
JOURNAL OF DISPERSION SCIENCE AND TECHNOLOGY
·
2018
·
IF 1.454
Shengfu Duan,Yajie Jiang,Tao Geng,Hongbin Ju,Yakui Wang
Novel methyltriphenylphosphonium carboxylate ionic liquid (IL) surfactants [Ph3PCH3][CH3(CH2)6COO] (MTPP-O), [Ph3PCH3][CH3(CH2)8COO] (MTPP-D), [Ph3PCH3][CH3(CH2)10COO] (MTPP-L), [Ph3PCH3][CH3(CH2)12COO] (MTPP-M), [Ph3PCH3][CH3(CH2)14COO] (MTPP-P), [Ph3PCH3][CH3(CH2)16COO] (MTPP-S) were synthesized via quaternization triphenylphosphine with dimethyl carbonate and anion exchange with different carboxylic acids successively. The structures of these IL surfactants were confirmed by FT-IR and 1H-NMR. Meanwhile, the wetting, foaming, and emulsification properties of these IL surfactants were studied in this paper. The results revealed that methyltriphenylphosphonium carboxylate IL surfactants have lower foaming properties than quaternary ammonium salts with the same anionic units. And, these IL surfactants show better emulsification ability to soybean oil than that of liquid paraffin. Furthermore, contact angle results indicated that these IL surfactants have different wettability for parafilm and the contact angle increases at a higher concentration for MTPP-L, MTPP-M, and MTPP-P.
研究领域:
化学
·
材料科学
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DOI
高影响因子
ADVANCED FUNCTIONAL MATERIALS
·
2026
·
IF 19.9
Zetao Liu,Lu Bai,Wei Zheng,Xiaoling Zhang,Xiaochun Zhang,Shaojuan Zeng,Yinge Bai,Xiangping Zhang
Graphene oxide (GO) holds great promise for fabricating high-flux separation membranes, yet its inherent interlayer defects often compromise precise molecular sieving, particularly for challenging separations such as selective ammonia (NH 3 ) capture and purification. In this work, a functionalized ionic liquid ([DBEAH][NTf 2 ]) with protic hydrogen and hydroxyl groups as NH 3 -interactive sites is designed and confined within GO interlayers via hydrogen bonding and electrostatic interactions, thereby constructing tailored pathways for selective NH 3 transport. The incorporated [DBEAH][NTf 2 ] not only modulates the interlayer spacing of GO but also modifies the nanochannels to create an NH 3 -affinitive environment for precise recognition and separation of NH 3 . The resulting IL-confined GO membrane achieves an outstanding combination of high NH 3 permeance of 682.17 GPU and ultrahigh ideal NH 3 /N 2 selectivity of 1488.41 in single-gas tests. Under mixed‑gas conditions (50/50 vol%, NH 3 /N 2 ), the membrane maintains a high NH 3 permeance of 493.82 GPU and an NH 3 /N 2 separation factor of 248.34. Theoretical simulations further confirm that the confined [DBEAH][NTf 2 ] facilitates rapid and selective transport of NH 3 while effectively blocking N 2 , providing a mechanistic understanding of the enhanced separation performance. This study offers a feasible strategy for designing 2D membranes with simultaneously high permeance, selectivity, and stability for NH 3 separation applications.
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高影响因子
INDUSTRIAL & ENGINEERING CHEMISTRY RESEARCH
·
2026
·
IF 3.9
Yongfa Wang,Xiaoyan Zheng,Haiyan Liu,Gang Wang,Jie Li,Chunshan Li
Methacrolein (MAL) as an intermediate of methyl methacrylate is produced from C4 selective oxidation, which faces the challenging problems of selectivity control and petroleum depletion; therefore, the aldol reaction of formaldehyde with propionaldehyde receives great attention. In this work, we developed an effective plug flow reaction process for continuous methacrolein synthesis catalyzed by an efficient sec-amine-based ionic liquid with low dosage at enhanced temperature (100–160 °C) and pressure (1–5 MPa). The effects of the cation and anion structure, as well as reaction conditions, on the catalytic performance were systematically investigated for further optimization. Main side reactions including methylation of sec-amine group in cation, self-condensation of propionaldehyde, and dimerization of MAL were identified by (GC–MS) for the construction of reaction networks. It was found that the combination of N-methylcyclohexylamine and benzoic acid for ionic liquid preparation achieved the highest catalytic performance of 99.8% propionaldehyde conversion and 98.1% MAL selectivity under optimal condition. Reaction orders and activation barriers of both main and side reactions were determined, which enabled the establishment of four-step coupled kinetic model with regression deviation within 5%. Recycling tests revealed that the catalyst deactivation was mainly derived from irreversible N,N-dimethylcyclohexylamine formation; however, it could be economically recovered to partially compensate catalyst loss.
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产品关联
DOI
高影响因子
COLLOIDS AND SURFACES A-PHYSICOCHEMICAL AND ENGINEERING ASPECTS
·
2022
·
IF 5.518
Fengjin Xie,Fei Lu,Chongzhong Liu,Ye Tian,Yanan Gao,Liqiang Zheng,Xinpei Gao
The combination of membrane separation technology and hydrometallurgy has opened up new possibilities for the recovery and recycling of lithium from ever-growing spent lithium-ion batteries. Herein, we prepared a series of positively charged poly(ionic liquid) membranes preserving liquid crystal mesophases and investigated the monatomic ion separation capacity of the liquid crystalline membranes by diffusion dialysis experiments using the simulative spent battery leachate. The results revealed that liquid crystalline membranes with bicontinuous cubic liquid crystal structure possessed great potential as precise ion separation membranes for lithium-ion enrichment. Compared to the other topological structures, the bicontinuous cubic liquid crystal structure enhanced both the Li + flux and ion selectivity of the membranes. The ion flux of the membrane with this structure was three times higher than that of amorphous membranes. Meanwhile, the Li + /Ni 2+ selectivity was up to 7.40, which was significantly higher than that of hexagonal liquid crystalline membranes (2.59) and commercial membranes AMI-7001S (5.71). Moreover, the preservation of liquid crystal structures obviously improved the water management capacity and mechanical strength of the membranes.
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高影响因子
JOURNAL OF MOLECULAR LIQUIDS
·
2023
·
IF 6
Zejun Zhang,Zhansheng Wang,Hua Zhang,Qingji Wang,Yuqi Tang,Qian Qu,Liwei Shen,Yuanzhu Mi,Xuemin Yan
In this paper, an ionic liquid demulsifier (MDBr-IL) with double cationic centers and multiple hydrophobic chains was synthesized with N,N,N,N,-tetraglycidyl- 4,4-diaminodiphenylmethane as starting materials. The structure of MDBr-IL was characterized by Fourier transform infrared spectrometer (FT-IR) and 1 H nuclear magnetic resonance spectrometer ( 1 H NMR). Effect of a few key factors such as concentration, demulsifying time, demulsifying temperature, salinity and pH value on the demulsifying efficiency (DE) was detailly researched in a water-in-crude oil emulsion. When the concentration of MDBr-IL was 500 mg/L, the DE reached 95.24% at 60 °C for 180 min. Also, the DE could increase to 98.64% when the demulsifying temperature was 70 °C. In addition, MDBr-IL had an eminent resistance to acid, alkali and salt. Also, the salinity could further improve the demulsification performance. Interfacial properties and wettability were employed to investigate the possible demulsification mechanism. It demonstrated that MDBr-IL is a viable demulsifier for the separation of oil-water emulsions.
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高影响因子
INTERNATIONAL JOURNAL OF HYDROGEN ENERGY
·
2023
·
IF 7.2
Zongxu Wang,Zixin Li,Amado Velázquez-Palenzuela,Yinge Bai,Haifeng Dong,Lu Bai,Xiangping Zhang
Bubbles generated on the electrode surface have been considered one of important factors limiting the efficiency of hydrogen evolution reaction (HER). However, the bubble formation behaviors have not been clearly defined, especially nanobubbles in ionic liquid system. In this work, single H 2 nanobubbles generation characters are well investigated using platinum nanoelectrodes in ionic liquid (IL) during HER. The crucial factors ( i . e ., critical condition, geometry, and nucleation rapid of the H 2 nanobubbles) are quantitatively conducted from the voltammograms. The results reveal that the H 2 nanobubbles have a small contact angle (from 152° to 160°) and large bubble height (0.5–1.1 nm), which are favorable for subsequent detachment from nanoelectrode surface. Moreover, higher nucleation energy (7.5–15.3 kT) indicates that IL can suppress bubble formation. This work has gained a fundamental insight into the dynamic formation behaviors of H 2 nanobubble in IL, which can guide us to study H 2 bubbles in the HER influenced by various factors.
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DOI
高影响因子
LANGMUIR
·
2022
·
IF 4.331
Yani Ma,Yao Chen,Feixia Peng,Xueqin Ding
A phenylpropyl guanidinium magnetic ionic liquid (PGMIL) was designed and prepared to extract RNA from complex samples. The properties of PGMIL were characterized by a vibrating sample magnetometer, Fourier transform infrared spectrometer, thermogravimetric analyzer, transmission electron microscope, and scanning electron microscope. Through single-factor analysis, the factors affecting the RNA extraction process, such as PGMIL volume, temperature, extraction time, and pH, were systematically investigated. The ability of PGMIL to selectively extract RNA was investigated by a NanoDrop. Under the optimized conditions, the extraction efficiency of RNA can reach 81.9 ± 1.9%. The proposed extraction method has been demonstrated with the extraction of RNA from a series of complex sample matrices, including a metal ion mixture and medicinal yeast. After extraction, the retained RNA could be readily recovered by simply using Tris–HCl buffer, with a recovery rate of 68.11 ± 2.45%. Regeneration studies have shown that the extraction efficiency of PGMIL did not change significantly after using 4 times. This study provides a green, rapid, and environmental friendly extraction method for the selective extraction of RNA.
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产品关联
DOI
PubMed
高影响因子
SEPARATION AND PURIFICATION TECHNOLOGY
·
2022
·
IF 9.136
Li Xu,Xianjie Zeng,Qing He,Tao Deng,Chengyi Zhang,Wen Zhang
The separation of lithium and magnesium is crucial for the exploitation of lithium resources with a high concentration of magnesium ions (Mg 2+ ). In this study, polymer inclusion membranes (PIMs) based on the stable ionic liquid (IL) extractant system were developed for separating lithium ions (Li + ) from Mg 2+ in aqueous solutions. The mixture of 1-butyl-3-methylimidazolium bis(trifluoromethylsulfonyl)imide ([C 4 mim][NTf 2 ]) and tributylphosphate (TBP) was used as the carrier to transfer Li + , and the cellulose triacetate (CTA) polymer was chosen as the matrix due to its high compatibility with [C 4 mim][NTf 2 ] via hydrogen bond. The TBP was kept in the membrane matrix without obvious leakage in the membrane extraction process, and the lithium selectivity and extraction percentage of the membranes decrease by less than 10% after five continuous extraction operation cycles. In the transport experiment using the feed containing 7.2 mmol/L Li + and 2.06 mmol/L Mg 2+ , the PIM with 40 wt% TBP-[C 4 mim][NTf 2 ] exhibits the separation factor of 2.24 for Li + /Mg 2+ and an initial flux of 0.89 × 10 −6 mol m −2 s −1 for Li + , much higher than the results of the pure CTA membranes, indicating that TBP-[C 4 mim][NTf 2 ] system is efficient for Li + extraction in PIM membrane. Besides, the PIMs we prepared were applied to extract Li + from simulative salt-lake brines with a high Li + /Mg 2+ selectivity of 23.87. The IL-based PIMs provide a possible membrane technology to extract Li + from salt-lake brines with high stability, low energy consumption and environment-friendly.
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高影响因子
ACS Sustainable Chemistry & Engineering
·
2022
·
IF 9.224
Xiaoyan Pei,Zhiyong Li,Huiyong Wang,Qiuju Zhou,Zuodong Liu,Jianji Wang
Surfactant-free microemulsions (SFMEs) have shown great potential in many aspects such as chemical reactions and material preparation. Ionic liquid (IL)-based SFME is a promising member in this family. However, switchable phase separation of nonaqueous IL SFMEs has not been reported up to now although it is of great importance for the separation of products and recycling of the systems. Herein, a new kind of CO2-responsive SFMEs composed of quaternary ammonium IL, dimethyl sulfoxide, and ethyl acetate has been developed. It is worth noting that the microemulsion can be reversibly switched between emulsification and complete phase separation upon alternative CO2 and N2 bubbling at atmospheric pressure. The microstructures and phase behavior of the systems before and after CO2 bubbling have been systematically studied by phase diagrams, electrical conductivity, dynamic light scattering, optical microscopy, and atomic force microscopy, respectively. Mechanism studies verify that the reversible switching is attributed to the generation and restoration of more hydrophilic carbamate salts from the reaction of CO2 with IL anions, which results in poor solubility of ILs in the nonaqueous microemulsions and thus reversible breaking and rebuilding of the microemulsions. Based on this unique phase behavior, the CO2-switchable SFMEs are used as a microreactor for room temperature synthesis of Zn-based metal–organic frameworks, and effective reaction and microemulsion recycling have been achieved. This study may provide a new strategy for the integration of reaction, separation, and recycling procedures to obtain sustainable chemical processes.
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高影响因子
JOURNAL OF POWER SOURCES
·
2022
·
IF 9.794
Xianhong Chen,Ling Liang,Weida Hu,Haiyang Liao,Yongqi Zhang
Traditional lithium-ion batteries based on liquid electrolytes cannot adapt to the increasing and various highly flexible requirements. In this work, a confinement-driven strategy has been developed to confine the ionic liquids in a polyhedral oligomeric silsesquioxanes (POSS) and poly(ethylene glycol) diacrylate (PEGDA) hybrid cross-linked poly(ionic liquid)s ionogel (POSS-CPIL-n), which endows this novel electrolyte superior flame retardancy and dramatically flexibility. The POSS-CPIL-n ionogel renders exceptional flexibility (bend, fold and twist) and desired mechanical properties (2.5 MPa). Advantageous for high dissociation of lithium salt , high ionic conductivity (2.5 mS cm −1 at 25 °C) and considerable lithium ion mobility (0.51) are provided. Thanks to the flexibility of ionogel electrolyte together with excellent thermal and electrochemical stability, the LiFePO 4 ||Li cell based on POSS-CPIL-n exhibits significant rate performance and cycling stability, the capacity of the cell can reach to 100 mAh g −1 at 4 C and maintain a substantial discharge capacity of 160.5 mAh g −1 after 200 cycles at 0.2C. Furthermore, the soft-package assembled with POSS-CPIL-n can successfully charge a cell phone and continue to supply power stably even when the battery is exposed to the air, which indicates that POSS-CPIL-n has a promising potential application in high safety flexible electronic devices.
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高影响因子
CHEMICAL ENGINEERING & TECHNOLOGY
·
2022
·Vol. 45
·期 10
·1842-1849
·
IF 2.215
Junteng Ma,Weihua Shen,Wenxuan Wei,Yunjin Fang
The catalytic activity of an ionic liquid catalyst decreased during the transesterification of propylene carbonate (PC) with methanol to dimethyl carbonate (DMC). The interaction between the strong basic sites of ionic liquid catalyst and carbonyl compounds of PC and/or DMC was considered to attribute to this deactivation. The presence of H 2 O accelerated this process by the formation of OH – . The strong basic ionic liquid reacted with the trace amount of H 2 O in the reaction system to generate OH – , which then reacted with the carbonyl structure in PC and/or DMC to form the inactive compound HCO 3 – , resulting in the deactivation of the ionic liquid catalyst. A plausible mechanism was proposed for the deactivation of the ionic liquid catalyst in this reaction.
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高影响因子
危险品化学品经营许可证（带存储）