Nanoscale
·
2020
·Vol. 12
·期 34
·17902-17914
·
IF 6.895
Lifang Chen,Ting Zhang,Hongye Cheng,Ryan M. Richards,Zhiwen Qi
In order to develop highly active non-precious metal catalysts for the selective oxidation of the platform compound 5-hydroxymethylfurfural (HMF) to the value-added bio-chemical 2,5-diformylfuran (DFF), we prepared high purity bivalent Mn5O8 nanoplates by a microwave-assisted ionic liquid route. The precursor of bivalent Mn5O8 nanoplates was formed through π–π stacking between imidazolium rings of the ionic liquid 1-butyl-3-methyl-imidazolium chloride and extending hydrogen bonds between Cl anions and hydrohausmannite. An oriented aggregation growth occurred on the basis of the Ostwald ripening under microwave heating. The high purity bivalent Mn5O8 nanoplates obtained through calcination at 550 °C for 2 h exhibited high HMF conversion (51%) and DFF selectivity (94%) at 5 bar of oxygen pressure in 2 h. The high concentration of Mn4+ on the exterior surfaces of Mn5O8 nanoplates as active sites coupled with good crystallinity played key roles for desirable mass and heat transfer, and for fast desorption avoiding over-oxidation. The reaction process over the Mn5O8 nanoplates was proposed based on the understanding of Mn4+ active centers and lattice oxygen via a Mn4+/Mn2+ two-electron cycle to enhance their catalytic performance. Furthermore, the Mn5O8 nanoplates could be readily recovered and reused without loss of catalytic activity. Thus, the high purity Mn5O8 nanoplates with good catalytic performance raises the prospect of using the type of sole metal oxide for practical applications.
✓ 已验证
产品关联
DOI
PubMed
高影响因子
CATALYSIS LETTERS
·
2020
·Vol. 151
·期 3
·720-733
·
IF 2.482
Zhu Anlian,Li Qixing,Feng Wanlu,Fan Dongshuang,Li Lingjun
Abstract The synthesis of 2-amino-4H-chromenes through one-pot multicomponent reactions has received great attention due to the high atom efficiency and the broad bioactivities of the products. Here, the catalytic performances of a series of functional ionic liquids towards this type of reaction were investigated and the results showed that the ionic liquid, choline acetate ([Choline][Ac]), could efficiently promote this reactions under room temperature without the necessary of organic solvents. The reaction is easy to be conducted and the following work-up procedures are very simple. The pure products can be obtained through extraction and washing procedures, no column separation procedures are needed. Intriguingly, this reaction system can be easily scaled up to multi-gram, suggesting its perspective in industrial applications. In addition, the ionic liquid [Choline][Ac] can be easily prepared from cheap and biocompatible materials, and it can be feasibly recycled and reutilized for at least five cycles. Graphic Abstract
Various aldehydes, malononitrile and activated phenols could be converted to the
corresponding 2-amino-4H-chromenes with good to excellent isolated yields under
the catalysis of choline acetate at room temperature.
✓ 已验证
产品关联
DOI
高影响因子
Polymers
·
2020
·Vol. 12
·期 11
·2763
·
IF 3.426
Munir Hussain,Sohail Yasin,Hafeezullah Memon,Zhiyun Li,Xinpeng Fan,Muhammad Adnan Akram,Wanjie Wang,Yihu Song,Qiang Zheng
In this paper we designed greener rubber nanocomposites exhibiting high crosslinking density, and excellent mechanical and thermal properties, with a potential application in technical fields including high-strength and heat-resistance products. Herein 1-ethyl-3-methylimidazolium acetate ([EMIM]OAc) ionic liquid was combined with silane coupling agent to formulate the nanocomposites. The impact of [EMIM]OAc on silica dispersion in a nitrile rubber (NBR) matrix was investigated by a transmission electron microscope and scanning electron microscopy. The combined use of the ionic liquid and silane in an NBR/silica system facilitates the homogeneous dispersion of the silica volume fraction (φ) from 0.041 to 0.177 and enhances crosslinking density of the matrix up to three-fold in comparison with neat NBR, and also it is beneficial for solving the risks of alcohol emission and ignition during the rubber manufacturing. The introduction of ionic liquid greatly improves the mechanical strength (9.7 MPa) with respect to neat NBR vulcanizate, especially at high temperatures e.g., 100 °C. Furthermore, it impacts on rheological behaviors of the nanocomposites and tends to reduce energy dissipation for the vulcanizates under large amplitude dynamic shear deformation.Keywords:nitrile butadiene rubber;rheology;ionic liquids;tensile properties
✓ 已验证
产品关联
DOI
PubMed
高影响因子
ENERGY
·
2020
·
IF 6.082
Fa-Ping Liu,Ai-Rong Li,Jie Wang,Ze-Dong Luo
Hydrate technology is a promising alternative method for carbon dioxide (CO 2 ) capture and storage from flue gas . In order to promote the hydrate growth rate and increase gas storage capacity, CO 2 hydrate nucleation and growth induced by iron-based ionic liquid ([BMIM][FeCl 4 ]) was studied with 400 rpm rotation speed at a temperature of 274.15 K and initial pressure of 5.0 MPa in this work. The induction time of CO 2 hydrate formation was decreased by 52.8% and the storage capacity of CO 2 hydrate was increased by 13.7% in 25.0 g/L [BMIM][FeCl 4 ] solution. The local hydrogen bonds are strengthened by the combination interaction between the complex anion ([FeCl 4 ] − ) and water (H 2 O) molecules, which is favorable to the ordered arrangement and the proton exchange rate of H 2 O molecules during the hydrate nucleation. Besides, large mass transfer channels are formed by the large molar volume and regular tetrahedral structure of [FeCl 4 ] − during the hydrate growth, which improves the diffusion rate of CO 2 and H 2 O molecules in the solution to promote the hydrate growth. Distribution of lipophilic cation and hydrophilic anion with a large molecular volume of [BMIM][FeCl 4 ] at the gas-liquid interface hinders the formation of cage structure of H 2 O molecules.
✓ 已验证
产品关联
DOI
高影响因子
ELECTROCHIMICA ACTA
·
2020
·
IF 6.215
Qipeng Zhang,Kecheng Pan,Mengmin Jia,Xiaoyan Zhang,Lan Zhang,Haitao Zhang,Suojiang Zhang
Poly(ethylene oxide) (PEO)-based solid state batteries is one of the most attractive candidates for next-generation high performance energy storage devices, especially when it matches the LiCoO 2 cathode of high volumetric energy density. However, cathode/electrolyte interface reactions will be triggered at high voltage, leading to high interfacial resistance and fast capacity decay. In this work, a selected ionic liquid , 1-methyl-1-propylpiperidinium tetrafluoroborate (PP 13 BF 4 ), is prepared and applied in LiCoO 2 electrode operating at high work voltages of 3.0–4.3 V to regulate the interface. Electrochemical impedance spectroscopy and holding test indicate that facilitated by the PP 13 BF 4 , the cathode/electrolyte interfacial reaction is effectively suppressed and the resistance is reduced. When an optimal content, 2 wt%, PP 13 BF 4 is added into the LiCoO 2 electrode, the solid-state lithium metal cell delivers an initial discharge capacity of 125.1 mAh g −1 under the current density of 0.05 C at 55 °C, which is almost twice that of bare electrode. Meantime, it retains 76.3% of its capacity in 100 cycles under 0.2 C rate. Further characterizations illustrate that PP 13 BF 4 participates in the formation of a protective CEI, which effectively suppresses parasitic reactions between electrolyte and electrode. This work provides a facile and practical idea for the development of 4 V class solid state lithium metal batteries .
✓ 已验证
产品关联
DOI
高影响因子
Biomass Conversion and Biorefinery
·
2020
·Vol. 12
·期 9
·3933-3942
·
IF 2.602
Xu Lu,Wang Aili,Li Siqiang,Zhang Liya,Pan Ruiyu,Guo Peng,Yi Ming,Liu Jie
Biomass residue cellulose-based poly-(ionic liquid)s (ILs) were in situ synthesized via activators generated by electron transfer for atom transfer radical polymerization in ionic liquid microemulsions. These biomass residues, including apple residue, citrus residue, and ginkgo leaf, were started with pretreatment and modification in ionic liquid microemulsions, and their structure and thermal stability were significantly altered before and after modification as confirmed by scanning electron microscopy and thermogravimetric analysis. Fourier-transform infrared spectroscopy and 31 P nuclear magnetic resonance spectroscopy were used to investigate the molecular structure of the biomass residue cellulose-based poly-ILs. In addition, the adsorption performance of the biomass residue cellulose-based poly-IL adsorbents for heavy metal ions, such as Cd(II), Zn(II), Cr(IV), Cu(II), Mn(II), Ni(II), and Pb(II), in water were investigated. Results show that the prepared adsorbent possesses good thermal stability and certain adsorption capacity for metal ions in water, especially for nickel ions (93.91 mg/g). The prepared adsorbent also exhibits remarkable performance in the field of biomass residue utilization and novel poly-IL adsorbents.
✓ 已验证
产品关联
DOI
高影响因子
JOURNAL OF FOOD COMPOSITION AND ANALYSIS
·
2020
·
IF 3.721
Meseret Amde,Ayalew Temsgen,Nigussie Dechassa
Aflatoxins (AFs) in food and agricultural products pose serious health hazards to consumers. As a result, exports are restricted and farmers lose much needed income. One major challenge faced in controlling AFs in developing countries in particular is lack of simple and cost-effective methods of analysis. To address this problem, a solid-phase microextraction (SPME) technique was developed based on 1-hexyl-3-methylimidazolium hexafluorophosphate functionalized zinc oxide nanorods for the extraction of AFB1, AFB2, AFG1 and AFG2 in food products prior to HPLC analysis. The SPME was performed using 10 mg of the adsorbent at pH 7 and vortexing for 1 min at 500 rpm, and desorbed by sonication for 2 min in 1 mL acetonitrile. The technique showed excellent linearity (correlation coefficients, ≥0.997). LOD and LOQ were determined respectively to be 0.07 and 0.73 μg/kg for AFB1, 0.01 and 0.12 μg/kg for AFB2, 0.04 and 0.44 μg/kg for AFG1 and 0.02 and 0.18 μg/kg for AFG2. The intra- and inter-day relative standard deviations were in the ranges of 3.9–4.7% and 6.9–8.4%, respectively. The acquired recovery of blank samples of the pepper and groundnut samples spiked with mixed analytes at 5 and 10 μg/kg spiking levels were in the range of 88.6–99.8%. The SPME was employed for the analysis of the considered analytes from real chili pepper and processed groundnut samples. Overall, the technique is easy, fast, cost-effective and environmentally friendly and can be used for the analysis of AFs in various food and agricultural products.
✓ 已验证
产品关联
DOI
高影响因子
ENVIRONMENTAL SCIENCE & TECHNOLOGY
·
2020
·
IF 7.864
Xiaohui Zhan,Bihong Lv,Kexuan Yang,Guohua Jing,Zuoming Zhou
To address the problems of high viscosity and difficult regeneration of the rich phase solution, a dual-functionalized ionic liquid ([DETAH][Tz]) was dissolved into a 1-propanol-water solvent to form a novel biphasic solvent for CO2 capture. The rich phase kept 96% of the total CO2 loading (1.713 mol mol–1) but only 44% of the total volume, and its viscosity was only 2.57 mPa s. As a regeneration promoter, 1-propanol helped the rich phase to maintain 90% of its initial loading after fifth regeneration. The high number of amine functional groups into [DETAH]+ and the equimolar reaction of [Tz]− provided the high CO2 loading, while [Tz]-H and 1-propanol ensured the high regeneration efficiency of the rich solution by enhancing the hydrolysis of RNCOO– to form HCO3–/CO32– and propyl carbonate. Due to a stronger polar and an aggregation of the CO2 absorption products in water, the CO2 products were enriched into the lower water phase while most of the 1-propanol was in the upper phase. The heat duty of [DETAH][Tz]-1-propanol-water was approximately 29.93% lower than [DETAH][Tz]-water (2.84 GJ ton–1 CO2) and 47.63% lower than MEA (3.80 GJ ton–1 CO2), which would be a promising candidate for CO2 capture.
✓ 已验证
产品关联
DOI
PubMed
高影响因子
INTERNATIONAL JOURNAL OF PHARMACEUTICS
·
2020
·
IF 4.845
Luyao Zheng,Zhiyuan Zhao,Ye Yang,Yaming Li,Chengxiao Wang
This study developed novel ionic liquids (ILs) based on amino acids. We first screened 15 methyl amino acid ester hydrochlorides ([AAC1]Cl) for their skin permeation enhancements using 5-Fluorouracil (5-Fu) and Hydrocortisone (HC) as model drugs. Glycine methyl ester hydrochloride ([GlyC1]Cl), L-proline methyl ester hydrochloride ([L-ProC1]Cl), and L-leucine methyl ester hydrochloride ([L-LeuC1]Cl) were selected, and their ester sites were modified with different carbon chains (C8 and C12). The resulting ILs showed improved permeation to the two drugs. TEWL and CLSM assays revealed the moderation effects of the modified ILs on skin barrier function, whereas L-proline dodecyl ester hydrochloride ([ProC12]Cl) and L-leucine dodecyl ester hydrochloride ([L-LeuC12]Cl) exhibited the strongest activities. Permeation mechanisms were further investigated by ATR-FTIR, solid-NMR, SEM, and TEM analyses. The results suggested that [L-ProC12]Cl and [L-LeuC12]Cl combined the advantages of amino acid esters and IL solvent and could interact with the intercellular lipid domain by the multi-functions of lipid fluidization and lipid extraction, which were observed in a dosage- and time-dependent manner. Additionally, pathological examination suggested that the amino acid ester-based ILs (AAE-ILs) had good biocompatibility . In conclusion, this study has generated novel chemical penetration enhancers (CPEs) based on AAE-ILs and may be potentially utilized in drug transdermal delivery systems (TDDSs).
✓ 已验证
产品关联
DOI
PubMed
高影响因子
CATALYSIS LETTERS
·
2021
·Vol. 152
·期 4
·1182-1193
·
IF 3.186
Shi Kaiyu,Guo Liying,Zheng Rongrong,Wang Haiyue,Chen Yanming
Five kinds of diacid comprising ionic liquid catalyst [HO 3 S–(CH 2 ) 4 -mim]Cl–MCl x ] were prepared, and their chemical structure, thermal stability and acidity were tested and analyzed. The performance evaluation of catalysts was carried out, and the process parameters were optimized. The cycling stability of the catalysts was investigated. Then, the catalytic degradation of polyethylene terephthalate (PET) was studied, and used mineral water bottles as an example. The chemical structure and molecular weight of the degradation product terephthalic acid bis(2-hydroxyethyl) ester (BHET) were analyzed. The results showed that among the catalysts synthesized, [HO 3 S–(CH 2 ) 4 -mim]Cl–FeCl 3 had the great catalytic performance and good thermal stability. According to the thermal gravimeter analysis, the decomposition temperature of the diacid ionic liquid catalyst ranges from 400 to 560 °C, while the degradation reaction temperatures in this paper are all below 250 °C, so that it has good thermal stability. At 190 °C, the PET alcoholysis rate reached 98.7% and the BHET yield reached 95.5% for 6 h, and the highest catalytic activity could still be maintained after 6 cycles, which indicate that the catalyst has excellent performance for degrading PET, and will have a great application prospect. Graphic Abstract
✓ 已验证
产品关联
DOI
高影响因子
JOURNAL OF MOLECULAR LIQUIDS
·
2021
·
IF 6.165
Bing Liu,Yongzhong Jia,Zezheng Zhang,Huaxin Sun,Ying Yao,Yan Jing,Mixiang Qi,Quanyou Zhang
The solvent extraction separation of lithium isotopes has become of growing interest due to the need for 6 Li and 7 Li isotopes in the nuclear industry. A one-step synthesis of room temperature ionic liquid with low viscosity 1-Ethyl-3-methylimidazolium bis(trifluoromethylsulfonyl)imide ([EMIm][NTf 2 ]) (with reaction yields of 87.47%) was used by the ultrasonic method. The addition of ionic liquid [EMIm][NTf 2 ] in the system significantly improved the extraction efficiency and separation factor compared to the traditional organic solvent anisole for extraction separation of lithium isotopes. The distribution ratio increased from 0.00145 (with the single stage separation factor of 1.024 ± 0.001) to 0.134 (with the single stage separation factor of 1.034 ± 0.001). Furthermore, a multi-stage extraction process was intended to enhance lithium isotope separation performance. Each stage of stripping can be considered as an extraction separation equilibrium process, in which the strip liquor from the load organic phase is used for separation in the next stage as the “original aqueous solution”. The abundance of 6 Li + gradually improved with an increase in the extraction stages. The relative abundance of 6 Li + increased by 1.492% at the 20-stage extraction separation (from 7.53% to 9.022%). This new and simple approach (stripping cross-flow multistage method (SCFM)) was to achieve large enrichment of lighter isotopes of lithium ( 6 Li + ) by combined extraction and stripping process. In summary, the present study offers the possibility for the enrichment of 6 Li + during lithium isotope extraction separation.
✓ 已验证
产品关联
DOI
高影响因子
CHEMICAL ENGINEERING JOURNAL
·
2021
·
IF 13.273
Yiru Gao,Yanan Hao,Wenxin Zhang,Yanan Wei,Yang Shu,Jianhua Wang
Phototherapy still lacks effectiveness in treating tissue infections due to poor penetration depth of light and laser-induced non-specific thermal diffusion. Microwave thermal therapy (MWTT) is advantageous as characterized by strong tissue penetration, and higher heating rate. In addition, transdermal delivery of drugs helps in the treatment of tissue infections. Herein, we present an all-in-one MW-therapeutic hydrogel for eradicating bacterial infections with transdermal drug delivery. A microwave-responsive ionic liquid (IL), i.e., vinylbenzyl trimethylammonium chloride (VBTMACl), and a transdermal-enhancer IL, i.e., [2-(methacryloyloxy)ethyl] trimethylammonium chloride (ChMACl), are copolymerized with acrylic acid (AA) to form the hydrogel VACPHs. Polyvinylpyrrolidone (PVP) is incorporated with VACPHs to improve their mechanical stability. The model drug levofloxacin (LEVO) is subsequently loaded into the hydrogel, and the VACPHs-LEVO shows strong antibacterial effect. It is attributed to the efficient microwaveocaloric therapy of VBTMACl and enhanced transdermal antibiotic delivery by ChMACl. The drug delivery hydrogel developed in this research exhibits excellent performance for the treatment of deep tissue infections.
✓ 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）