CHEMICAL ENGINEERING JOURNAL
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2021
·
IF 13.273
Jin Liu,Liya Ma,Yang Zhao,Hongfei Pan,Haolin Tang,Haining Zhang
Understanding of porous structural effect of carbon electrode on the electrochemical performance of ionic liquids-based supercapacitors is essential for the design of carbon-based electrode materials due to the large ion size and high viscosity induced sluggish ion diffusion rate. Herein, we report the electrochemical performance of supercapacitors using imidazolium-type ionic liquid as electrolyte and nitrogen-doped porous carbon with tunable porous structure as model electrodes synthesized by a one-pot multiscale silica-templated strategy through pH regulation. The results reveal that the porous structure has significant influence on the electrochemical performance of the accordingly assembled supercapacitors. Carbon-based electrode materials with interconnected macro-, meso- and micro-pores can significantly improve the energy density of the thus-assembled symmetric supercapacitor devices, delivering an energy density of 93 Wh·kg −1 at power density of 1.75 kW·kg −1 . Benefiting from the interconnected multiscale pores, the assembled device can provide 48 Wh·kg −1 at a power density of 87 kW·kg −1 and lighten 20 white LEDs efficiently. Moreover, the assembled supercapacitor retains 88% of its initial capacitance after 10,000 continuous charge-discharge cycles at 10 A·g −1 .
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高影响因子
FUSION ENGINEERING AND DESIGN
·
2020
·
IF 1.692
Zezheng Zhang,Yongzhong Jia,Bing Liu,Huaxin Sun,Yan Jing,Quanyou Zhang,Fei Shao,Mixiang Qi,Ying Yao
The organic liquid film extraction system, a novel extraction system, was investigated for the extraction and separation of lithium isotopes using ionic liquid as the co-extractant and Dibenzo-15-crown 5-Ether (DB15C5) as the extractant. Multiple subjects were studied during the investigation, including the effects of extraction time; gas flow rate; temperature; counter anions of lithium salt; the length of the cationic carbon chain of ionic liquid on extraction, and separation of lithium isotopes. The maximum separation factor α was 1.037 ± 0.002 and the abundance of 6 Li increased from 7.61 % to 7.86 %. Based on the slope analysis method, the formation of 1:1 complex [Li (DB15C5)] + in the extraction phase was determined. The exchange of lithium isotope is spontaneous reaction at low temperatures (ΔH<0, ΔS<0). Also, the back-extraction times of lithium ions from extraction phase to aqueous phase were studied.
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高影响因子
JOURNAL OF APPLIED POLYMER SCIENCE
·
2020
·Vol. 138
·期 3
·49702
·
IF 2.52
Ping Wang,Zhaopei Cui,Xianhai Hu,Pei Xu,Yunsheng Ding
Biodegradable polylactide (PLA) and polyvinylidene fluoride (PVDF) blends containing the copolymer of PEGMA and 1-vinyl-3-ethylimidazolium bromide (PMI) were prepared, and the effects of ionic liquid segments of PMI on the compatibility of PLA and PVDF were investigated by dielectric relaxation spectroscopy (DRS). PMI can obviously improve the compatibility of PLA and PVDF, compared with the copolymer of PEGMA and vinyl imidazole (PMV). DRS showed that the compatibility of PLA and PVDF was related to the relaxation behavior of the blends, which was identified with Maxwell-Wagner-Sillars (MWS) interfacial polarization. The ε ' of PLA/PVDF/PMI blends was much higher than that of PLA/PVDF/PMV blends in the same temperature, resulting from the stimulation of MWS interfacial polarization by the ion mobility of PMI.
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高影响因子
JOURNAL OF MOLECULAR LIQUIDS
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2020
·
IF 5.065
Rongrong Wang,Wei Jin,Xirong Huang
In the present work, the sulfobetaine-type zwitterionic surfactant (SB- n ) was tried for the first time to construct hydrophobic ionic liquid (HIL)-based bicontinuous microemulsions . The composition-dependent phase behavior of the HIL/water (buffer)/SB- n ternary microemulsion system was determined by the method of T - γ fishlike phase diagram . It is found that the phase inversion temperature increases markedly with the increase of the alkyl chain length ( n ) of SB- n , but the surfactant efficiency changes little. The HIL greatly affects the phase behavior, depending on the ion structure. It is found that the SB-12 stabilized [C 8 mim][PF 6 ]-based microemulsion system has moderate phase inversion temperature, and moreover, its surfactant efficiency is the highest among the reported HIL-based bicontinuous microemulsions stabilized by conventional surfactants. The composition-dependent microstructure of the SB-12-stabilized [C 8 mim][PF 6 ]-based bicontinuous microemulsion was characterized by SAXS technique, and its influence on the catalytic performance of solubilized lipase was also explored. With the increase of the mass ratio of the HIL to water ( α ), the correlation length ( ξ ) changes slightly, but the microdomain size ( d ) decreases steadily. Unlike α , with the increase of the surfactant concentration ( γ ), the d changes little, but the ξ increases markedly. This abnormal change of ξ with γ should be ascribed to the interface rigidity of the microemulsion. The catalytic efficiency of lipase depends on the rigidity of the interface and its interfacial area. The above original studies not only enrich HIL-based microemulsion systems, but also provide scientific support for lipase-based green synthesis and transformation.
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高影响因子
ENERGY
·
2020
·
IF 6.082
Balaji Panchal,Kai Bian,Tao Chang,Zheng Zhu,Jinxi Wang,Shenjun Qin,Cunliang Zhao,Yuzhuang Sun
A new series of acidic, dendrimeric polyamidoamine based polymeric ionic liquids of [PAMAM 3256 C n ] were synthesized with a second generation polyamidoamine dendrimer , alkyl bromides and 1, 3-propane sultone via a two-step procedure. The structure of functional ionic liquids was characterized by Fourier-transform infrared spectroscopy, nuclear magnetic resonance spectroscopy. The polyamidoamine -1- dodecyl [PAMAM 3256 C 12 ] catalyst was used for green fuel production via the transesterification of yellow grease. The influence of reaction variables on the green fuel yield was studied using this catalyst. The catalyst was effective having achieved a 93% green fuel yield from yellow grease after 6 h of reaction at 65 °C, using 306.8 mol (10 mmol) (wt % based on molar concentration of lipids) of [PAMAM 3256 C 12 ] catalyst, a yellow grease-to-methanol molar ratio of 1:20 with a constant agitation speed 800 rpm. The catalyst was showed excellent stability for yellow grease transesterification over four cycles. Additionally, catalysts showed excellent transesterification activity of Jatropha curcas , Ricinus communis , and Pistacia chinensis oil, with green fuel yields of 90, 91, and 92%, respectively. The properties of green fuel were met the ASTM D6751-02 standards. Results indicate that the [PAMAM 3256 C 12 ] catalyst system shows promising potential as a viable industrial-scale alternative.
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高影响因子
CHEMICAL ENGINEERING JOURNAL
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2020
·
IF 10.652
Yan-Jun Wan,Krishnamoorthy Rajavel,Xing-Miao Li,Xiao-Yun Wang,Si-Yuan Liao,Zhi-Qiang Lin,Peng-Li Zhu,Rong Sun,Ching-Ping Wong
Ti 3 C 2 T x MXene with two-dimensional (2D)-layered structure shows potential application in various fields owing to its superb metallic conductivity and excellent solution processability. However, a fundamental challenge limiting the implementation of Ti 3 C 2 T x in practical applications is its susceptibility to oxidation in either humid or aqueous environments only within a few days, which results in the disassembly of the 2D-layered structure and severely deteriorates the functional properties including electrical conductivity, mechanical strength and EMI shielding performance. Herein, we firstly demonstrate a robust procedure to protect sensitive Ti 3 C 2 T x from degradation by modification with imidazolium-based inion liquid (IL), which remarkably improves the chemical stability of Ti 3 C 2 T x in aqueous and significantly increases the mechanical strength of assembled freestanding Ti 3 C 2 T x film (IL-MXene). The crystalline structure of IL-MXene sheet remains intact up to 30 days and preserves the 2D-layered structure as long as 8 months in aqueous, meanwhile, the tensile strength of freestanding IL-MXene film is as high as 75.9 ± 4.9 MPa and the increment is up to 84% when compared to that of untreated MXene film (41.2 ± 4.5 MPa). A novel mechanism for improved chemical stability of MXene sheet was proposed and elucidated based on the radical-scavenging ability of IL and the surface chemistry of MXene sheet. This study provides a new strategy to achieve chemically stable Ti 3 C 2 T x and improved mechanical strength of assembled MXene film, which is also available for other type of MXenes.
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高影响因子
POLYMER TESTING
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2021
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IF 4.282
Jingjing Guo,Ailian Wang,Wenxi Ji,Taoyi Zhang,Haolin Tang,Haining Zhang
Development of suitable catalyst binder with reasonable proton conductivity is of great importance for improving catalytic performance of oxygen reduction reactions of platinum-based catalysts. Herein, we report that polybenzimidazole grafted with protic ionic liquid moieties is an effective catalyst binder for oxygen reduction of Pt/C catalysts. The designed Pt/C catalyst layer using protic ionic liquid grafted polybenzimidazole as catalyst binder exhibits an improved catalytic activity for oxygen reduction compared with the sample using commercial Nafion as catalyst binder as evidenced by the positive shift of half-wave potential by about 20 mV with the very similar limiting current density. The specific activity of Pt/C catalyst using the synthesized material as catalyst binder at 0.9 V under acidic conditions is about two times higher than that of catalyst using Nafion as catalyst binder. The peak current density of thus-assembled fuel cell using protic ionic liquid functionalized polybenzimidazole as catalyst binder is about 1.7 times higher than the cell assembled from pristine polybenzimidazole as catalyst binder at 160 °C under anhydrous conditions.
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INDUSTRIAL CROPS AND PRODUCTS
·
2020
·
IF 4.244
Yu Yin,Chunhui Ma,Wei Li,Sha Luo,Yushan Liu,Xueyun Wu,Zhenwei Wu,Shouxin Liu
The efficient conversion of glucose to 5-hydroxymethylfurfural (5-HMF) in ionic liquids with MoCl 3 as catalyst under microwave irradiation was demonstrated. Based on 5-HMF yield, the ionic liquid 1-butyl-3-methylimidazolium chloride ([BMIM]Cl) was the best solvent. The results showed that compared to conventional oil-bath heating, microwave irradiation not only reduced the required reaction time from hours to minutes, but also improved the 5-HMF yield. Using 10 mol% of the catalyst, the 5-HMF yield reached 20.61 % at 120 °C after 2.5 h with the oil-bath. However, a 5-HMF yield of 27.66 % could be achieved within 5 min when employing 300 W microwave irradiation. Analyses by nuclear magnetic resonance spectroscopy (NMR) and high-performance liquid chromatography–mass spectrometry (HPLC-MS) demonstrated that the coordinate bond interaction between MoCl 3 /[BMIM]Cl complex and glucose promoted the isomerism of glucose and the dehydration of fructose. Microwave irradiation was also shown to accelerate the bond breaking processes in the reaction.
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高影响因子
FOOD CHEMISTRY
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2020
·
IF 6.306
Di Cao,Xu Xu,Xue Feng,Lei Zhang
A multifunctional visual observation of magnetic ionic liquid (MIL) benzyltrioctylammonium thiocyanatecobalt (II) [N 8,8,8,B + ] 2 [Co(SCN) 4 2- ] with the long-chain alkyl and benzyl group structures was designed and synthesized as microextraction phase. Designed new structural MIL displays good hydrophobicity, high extraction capacity for both aromatic and aliphatic compounds, and has obvious color markers (blue color) which is easy visual separation from aqueous solution through a magnet. In the present work, a green, efficient and rapid samples pretreatment method based on simultaneous derivatization and extraction of aromatic (tyramine, histamine, phenylethylamine, tryptamine) and aliphatic (spermidine and spermine) biogenic amines (BAs) were performed. Microwave-assisted derivatization coupled with MIL-dispersive liquid–liquid microextraction (DLLME) was established for the determination of six BAs in different food samples via HPLC. The method was successfully applied for the analysis of beer and milk samples, and the recoveries of analytes were 93.0–110.3% and 91.2–111.6%, respectively. The limits of detection (LODs) were 0.51–1.49 μg L -1 for six BAs. These results have demonstrated that the proposed method has offered an effective, accurate, and sensitive methodology for BAs residue detection in food sample, and this method has great potential for the routine analysis of large numbers of samples on measuring different kinds of compounds.
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PubMed
高影响因子
ACS Sustainable Chemistry & Engineering
·
2020
·
IF 7.632
Yahui Meng,Huize Luo,Cuihua Dong,Chunliang Zhang,Zhibin He,Zhu Long,Ruitao Cha
Simple, fast, and accurate detection of food freshness is of considerable significance to ensure food safety. The pH values of foods can be good indicators of their freshness, which can be used for real-time detection of food quality. Herein, we fabricated a pH-sensing film for flexible smart labels based on hydroxypropyl guar (HPG), cellulose nanocrystal (CNC), 1-butyl-3-methylimidazolium chloride (BmimCl), a kind of ionic liquid (IL), and anthocyanin (Anth). We investigated the structure, optical properties, and mechanical strength of the composite films. These films can be used to detect ammonia (NH3) generated from seafood during storage by pH-sensing capability and monitor the real-time freshness of seafood. The HPG/CNC/IL/Anth film exhibited several advantages, such as wide color-change range, easy identification, high sensitivity, good reversibility, excellent stability, and low detection limit. The pH-sensing films can function as flexible smart labels for real-time, visual, and accurate detection of food freshness in cold chain logistics and other fields.
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FOOD CHEMISTRY
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2020
·
IF 6.306
Jing Gao,Juyu You,Juhong Kang,Fanghong Nie,Hongwu Ji,Shucheng Liu
In this study, an ultrasonic-assisted extraction using microemulsions was developed for the recovery of natural astaxanthin from shrimp waste. To select applicable solvent systems, the phase equilibrium, microstructure, and physical properties of the microemulsions were investigated. Then the effect of ultrasonic power, ultrasonic time, and microemulsion composition on the extraction efficiency ( EE Ast ) and extraction yield ( E Ast ) of astaxanthin were determined. Compared with organic solvents (ethanol, acetone, and dimethyl sulfoxide), the microemulsion contained tributyloctylphosphonium bromide ([P 4448 ]Br), tributyloctylphosphonium trifluoroacetate ([P 4448 ]CF 3 COO), or tetrabutylphosphonium trifluoroacetate ([P 4444 ]CF 3 COO) resulted in significantly enhanced extraction of astaxanthin due to the stronger electrostatic interactions and hydrogen-bonding interactions. When ultrasonic-assisted extraction conditions were 50 W and 60 min, the highest EE Ast and E Ast reached 32.47 µg·g −1 and 99% by using the IL-in-water microemulsion of [P 4448 ]Br/(TX-100 + n -butanol)/water (0.13:0.25:0.62, w/w), respectively. The IL-based microemulsion is an adequate alternative to conventional methods in the extraction and recovery of astaxanthin from natural bioresources.
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PubMed
高影响因子
ELECTROANALYSIS
·
2020
·Vol. 32
·期 8
·1772-1779
·
IF 2.544
Yifei Yang,Yue Sun,Mingzhu Jin,Ru Bai,Yutong Liu,Yingqi Wu,Wei Wang,Xuewei Feng,Siyu Li
Superoxide dismutase (SOD) plays an important role in nearly all living cells. In this study, SOD imprinted poly(ionic liquid)s (SIPILs) were prepared on the surface of the bare Au electrode modified with nano-palladium and nano-gold (Au/nPd/nAu/SIPILs). SIPILs was synthesized with 1-vinyl-3-propyl imidazole sulfonate ionic liquids as functional monomers via electrochemically mediated atom transfer radical polymerization (eATRP) catalyzed by SOD. The Au/nPd/nAu/SIPILs was examined by cyclic voltammetry (CV), scanning electron microscope (SEM), energy-dispersive spectrometer (EDS) and X-ray photoelectron spectroscopy (XPS). The Au/nPd/nAu/SIPILs was also used as an electrochemical sensor to determine SOD by differential pulse voltammetry (DPV). Under the optimal conditions, the detection range of SOD was from 1.0×10 −8 to 1.0×10 2 mg L −1 with a limit of detection of 8.90×10 −9 mg L −1 (S/N=3). Compared with other methods, the sensor based on SIPILs had the broader linear range and lower detection limit.
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高影响因子
危险品化学品经营许可证（带存储）