CRYSTAL GROWTH & DESIGN
·
2021
·
IF 4.076
Yichen Jiang,Zhijiang Wang,Ping Xu,Jianmin Sun
Dicationic ionic liquid 1,1′-(hexane-1,6-diyl)-bis(3-methylimidazolium) dibromide was synthesized inside an MIL-101 metal–organic framework via a facile ship-in-bottle technique. The resultant dicationic ionic liquid @MIL-101 composite contains Cr sites as a Lewis acidic center and Br– as a nucleophile. The high BET surface area (1162 m2/g) and good synergic effects between the dicationic ionic liquid and MIL-101 resulted in good CO2 sorption capacity (47.4 cm3/g at 273 K) and high catalytic activity for the cycloaddition reaction of CO2 with epoxide without any cocatalyst or solvent, and a 92.5% propylene carbonate yield was obtained under 100 °C, 1.0 MPa for 2.5 h. Moreover, the dicationic ionic liquid @MIL-101 composite also showed better recycling stability and easy separation in the CO2 cycloaddition reaction. Compared with the complex synthetic route for the reported ionic liquid functional metal–organic frameworks, the facilely synthesized dicationic ionic liquid @MIL-101 composite exhibited comparable performance in CO2 capture and utilization.
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高影响因子
Small
·
2022
·Vol. 18
·期 11
·2106683
·
IF 15.153
Mengyan Cao,Xiujian Zhao,Xiao Gong
Conventional synthesis of carbon dots (CDs) mostly involves a hydrothermal or solvent-thermal reaction which needs relatively high temperature and pressure. In this work, ionic liquid is used to assist in fast synthesizing CDs with an ultrahigh photoluminescent quantum yield (98.5%) by heating at a low temperature (≤100 °C) and at atmospheric pressure. In addition, through this approach, tunable multicolor emissive CDs can be successfully achieved and used for preparing high-performance white light-emitting diodes. Theoretical computation proves that the activity of synthesis reaction can be significantly enhanced by ionic liquids. Density functional theory calculation reveals that the size and graphite nitrogen ratios of CDs have an effect on bandgap reduction, resulting in a redshift of the emission, which is in good agreement with the experimental results. This simple and promising approach for fast synthesis of tunable emissive CDs using ionic liquid affords the facilitation of CDs-based luminescent materials for fast manufacturing of functional devices.
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高影响因子
MATERIALS RESEARCH BULLETIN
·
2018
·
IF 2.873
Jinbo Zhao,Lili Wu,Chuanjiang Zhang,Tingxi Li,Qinglong Jiang,Feng Wang,Ping Zhao,Jong Eun Ryu,Zhanhu Guo
Petal-like Yb 3+ -Tm 3+ codoped Y 7 O 6 F 9 microparticles were achieved via ionic liquid-assisted (IL) hydrothermal process. The emission efficiency of Y 7 O 6 F 9 :Yb 3+ /Tm 3+ powders is much stronger than that of Y 2 O 3 :Yb 3+ /Tm 3+ sample. Under excitation at 980 nm with an unfocused laser beam under weak pump density of ∼0.1 W/cm 2 (pump power 10 mW), the UC emission of the sample can been seen clearly. Four emission bands at 477, 540, 647 and 692 nm are observed and correspond to the 1 G 4 state to 3 H 6 state, 1 D 2 state to 3 H 5 state, 1 G 4 sate to 3 F 4 state, and 3 F 3 state to 3 H 6 state transition of Tm 3+ ions. The enhanced UC emission is related to high crystallinity and lower effective phonon energy of oxyfluorides. The ionic liquid (IL) of [BMIM][BF 4 ] is used both as the reaction medium and the source of F − .
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高影响因子
CHEMICAL ENGINEERING JOURNAL
·
2020
·
IF 10.652
Nan Jin,Jun Yue,Yuchao Zhao,Hongying Lü,Chengxiu Wang
Conventional hydrodesulfurization technology was limited to treat aromatic heterocyclic sulfur compounds in ultralow-sulfur diesel. Extractive desulfurization (EDS) using ionic liquid (IL) exhibited good performance to address these issues, except for its long extraction time (15–40 min). To address this, microreactor was adopted to intensify the IL-based EDS, where dibenzothiophene was extracted from model diesel (MD) as the continuous phase to 1-butyl-3-methylimidazolium tetrafluoroborate as the dispersed phase under segmented flow (which appeared preferably at capillary numbers lower than 0.01). The effects of temperature, residence time and flow rate ratio on the desulfurization efficiency were investigated. The extraction equilibration time could be shortened from more than 15 min in conventional batch extractors to 120 s in microreactors. The extraction process was modeled according to the two-film model applied within a unit cell of the segmented flow, where the mass transfer resistance was considered primarily on the film side of the IL droplet. The mechanism for the improved EDS performance at higher temperatures or larger IL to MD flow ratios was investigated and validated, which was related to the significant increase in the diffusion coefficient or the specific interfacial area. These findings may shed important insights into the precise manipulation of IL-based EDS for a better process design and reactor optimization.
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高影响因子
RSC Advances
·
2015
·Vol. 5
·期 19
·14631-14636
·
IF 3.84
Haiyan Kang,Xianli Wang,Yan Zhang,Junfeng Wu,Hongqiang Wang
Considering bisphenol A (BPA) and tetrabromobisphenol-A (TBBPA) are ubiquitous environmental pollutants and widely manufactured into packaging materials, foodstuffs may be polluted by BPA and TBBPA. Additionally, there are very limited analytical methods for determining TBBPA in commercial milk samples. In this study, a rapid, simple and efficient method based on microwave-assisted ionic liquid microextraction (MAILME) combined with high-performance liquid chromatography (HPLC) was first applied to the simultaneous analysis of BPA and TBBPA in commercial milk samples. To achieve the optimum extraction performance, the experimental parameters of the MAILME, including type and amount of ionic liquid, microwave power, extraction time, pH and salt concentration in the sample, were evaluated and optimized. Under the optimum conditions, the detection limits were 0.01 and 0.02 μg L−1, and the quantification limits were 0.03 and 0.05 μg L−1 for BPA and TBBPA, respectively. The proposed method had good repeatability and reproducibility with RSDs lower than 5.6%. The recoveries of the analytes in the aged milk samples varied from 79.8 to 97.3%. The proposed method has been applied successfully to the determination of BPA and TBBPA in commercial milk samples with recoveries ranging from 78.2 to 99.8%. Compared with the other previous methods, the proposed method did not need to remove the fats and proteins in the milk, which made the sample pretreatment simple and rapid (5.0 min). And it also avoided the use of organic solvents. The proposed approach provides a new and promising alternative for simultaneously determining trace amounts of BPA and TBBPA in commercial milk samples or other similar samples.
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高影响因子
ACS Sustainable Chemistry & Engineering
·
2021
·
IF 8.198
Jian Fang,Zhi-Qiang Wang,Xinjia Wei,Yuan Ma,Honghui Gong,Xue-Qing Gong,Zhenshan Hou
The N-formylation reaction of various amines with CO2 is a promising method to utilize CO2 for the production of high value-added chemicals. Herein, an efficient Ru catalyst system consisting of Ru complex ([PPN][Ru(CO)3Cl3]) and the ionic liquid 1-butyl-3-methylimidazolium hydrogen phosphate ([Bmim]2[HPO4]), has been developed for the N-formylation reaction. Activity evaluation demonstrated that the catalyst system exhibited good to excellent yields of formamides under very mild conditions with the assistance of ionic liquids (ILs). Furthermore, the catalyst system could be reused at least five times with a slight loss of activity in N-formylmorpholine production. Further characterization by 1H nuclear magnetic resonance (NMR), 13C NMR, and density functional theory (DFT) calculations showed that the ILs ([Bmim]2[HPO4]) could facilitate the adsorption of CO2 by a concerted action of both cations and anions of the ILs to form phosphorus carbonate intermediate, thus effectively promoting the reaction. DFT calculations demonstrated that the formation of Ru–H was the first step, and then the CO2 absorbed by [Bmim]2[HPO4] inserted directly into Ru–H by cooperating with the Ru sites to form HCOO– species. After that, formate species dissociated from Ru catalysts and dehydrated to form formamides by the catalytic action of Ru complex and the basic IL.
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高影响因子
RSC Advances
·
2019
·Vol. 9
·期 33
·19114-19120
·
IF 3.049
Xingang Jia,Xiaoling Hu,Wenzhen Wang,Chunbao Du
Biomacromolecule-based nanomaterials have attracted much attention due to their excellent function in sensing, catalysis, medicine, biology and recognition. In this work, a silane-coupling ionic liquid, 1-(3-trimethoxysilylpropyl)-3-methylimidazolium chloride ([TMIM]Cl), was synthesized and applied to prepare ionic liquid-functionalized nanoparticles (SiO2@IL) using surface grafting technology. By employing multiple non-covalent interactions, including electrostatic interactions, hydrogen bonding and π–π stacking, the obtained functional nanoparticles were able to bind bovine serum albumin (BSA) with strong binding affinity, which has been illustrated through experiments and theoretical calculations. Moreover, the stability of SiO2@IL further demonstrated that it is promising in applications for biomacromolecule immobilization.
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高影响因子
CHEMICAL ENGINEERING JOURNAL
·
2015
·
IF 4.321
Suhang Xun,Wenshuai Zhu,Yonghui Chang,Hongping Li,Ming Zhang,Wei Jiang,Dan Zheng,Yuejiao Qin,Huaming Li
A supported SiW 12 O 40 -based ionic liquid (SiW-IL) catalyst with high catalytic activity is designed and synthesized by sol–gel method. The supported catalyst had amphiphilic property, making it exhibit good catalytic performance in solvent-free oxidative desulfurization system. The removal of dibenzothiophene (DBT) with the supported catalyst reached 99.9%, while the sulfur removal is only 6.3% with SiW-IL. The characterizations show that SiW-IL is supported on the carrier successfully and the supported catalyst had a sheet-shaped morphology. Then, various of experimental conditions were taken into consideration to investigate the influences of the desulfurization efficiency and the optimal conditions were obtained. Additionally, sulfur removal of different substrates decreased in the following orders: DBT > 4-MDBT > 4,6-DMDBT > BT under the same conditions. GC–MS analysis was employed to study the mechanism of the desulfurization, DBT sulfone was proved to be the oxidizing product of DBT. Moreover, the supported catalyst had a good thermal and chemical stability, and sulfur removal of DBT still remained 96.2% after recycling 7 times.
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高影响因子
POLYMER
·
2022
·
IF 4.432
Xiaodi Dong,Baoquan Wan,Ming-Sheng Zheng,Haiping Xu,Jiefeng Gao,George Chen,Jun-Wei Zha
There is an urgent need for interlayer dielectric materials with ultralow dielectric properties , high temperature resistance and hydrophobicity in the field of microelectronics due to the development of high-density integration and miniaturization of electronic components. Herein, porous polyimide (PI) films were successfully prepared by using ionic liquid (1-Butyl-3-methylimidazolium tetrafluoroborate, [BMIM][BF 4 ]) as porogen for the first time. Based on the inherent good compatibility between [BMIM][[BF 4 ] and polyimide, this ionic liquid could be uniformly dispersed in the PI matrix, thus creating a favorable prerequisite for the formation of pores. It was demonstrated that the optimized rearrangement of PI molecular chains induced by etching process of [BMIM][BF 4 ] led to the generation of pores and the reduction of chain spacing, which endow the porous films excellent dielectric, thermal and mechanical properties . The film with the porosity ratio of 85 vol% exhibited minimum permittivity of 1.5 at a wide range from 10 2 to 10 6 Hz, high temperature of 5% weight loss about 532 °C. The porous PI films not only provide the promising ultralow permittivity dielectric materials for the development of modern integrated circuits, but also present potential application in adsorption separation and special electromagnetic detection.
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高影响因子
JOURNAL OF MOLECULAR LIQUIDS
·
2015
·
IF 2.515
Aiqi Wang,Zhi Zeng,Jinwei Gao,Qianming Wang
An amphiphilic ionic liquid (diallyldimethylammonium tetrafluoroborate) assisted hydrothermal method has been applied for the synthesis of lanthanide fluoride nanoparticles . It has been carried out under mild conditions and large scale amounts of samples can be facilely achieved by this efficient way. Luminescence features of the phosphors were studied by steady state fluorescence and the samples could present striking 5 D 0 → 7 F 1 transition with orange-red color, suggesting that Eu 3 + ions are located in the crystal lattice with inversion symmetry. The particle size distribution was investigated by scanning electron microscope and the results showed that different microstructures such as nano-rods and nanoplates were obtained.
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高影响因子
HIGH PERFORMANCE POLYMERS
·
2023
·
IF 2.1
Huanhuan Gao,Xiaozhou Zhang,Xigao Jian,Jinyan Wang
In this study, the melt polycondensation reaction of 9,9’- bis(4-hydroxyphenyl)fluoride (BHPF) and diphenyl carbonate (DPC) was catalyzed using three ionic liquids (ILs) and a conventional alkali metal as catalysts. The optimal IL catalysts were determined to be [BMmim][BF4] ionic liquid catalysts, and the catalytic mechanism was investigated. Furthermore, the optimum process conditions were identified: the optimal amount of [BMmim][BF4] was 0.05 mol% based on DPC, the polycondensation temperature was set at 200°C for a duration of 3 h, followed by polymerization at 280°C for another 3 h. As a result, the Mn value of poly(9,9-bis(4-hydroxyphenyl) carbonate) (PFC) reached up to 41387 g/mol with a glass transition temperature band of approximately 254°C and Td-5% value of around 436°C.
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高影响因子
ELECTROCHIMICA ACTA
·
2014
·
IF 4.086
Meiling Wang,Yunqiao Gao,Jinjiang Zhang,Jianwei Zhao
Graphite oxide (GO) is a pH-dependent amphiphile with hydrophilic edges and a more hydrophobic basal plane. It was found that when the hydrophobic prototype ionic liquid (IL) of 1-butyl-3-methylimidazolium hexafluorophosphate ([BMIM][PF 6 ]) was added into GO water, it experienced changes from coagulation to being redispersed in water phase by constantly turning its pH to alkali condition. Then new aqueous dispersions of GO-[BMIM][PF 6 ] “water” formed after facile sonicate. The introduction of [BMIM][PF 6 ] not only minimize the defects of poor electrical conductivity of GO and more interesting is that the carbon nanotube (CNT) can be highly dispersed in this GO-[BMIM][PF 6 ] water through a simple and facile ultrasonic method at room temperature, forming a new composite of GO-[BMIM][PF 6 ]-CNT with high dispersibility. This novel composite enhanced its electrochemical signal obviously in the measurement of dopamine (DA) in biological systems and exhibited a wider linear response ranging from 8.0 × 10 −12 –1.5 × 10 −5 M. The detection limit of 3.0 × 10 −12 M at a signal to-noise ratio of 3 was two orders of magnitude lower than that reported previously.
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高影响因子
危险品化学品经营许可证（带存储）