JOURNAL OF HAZARDOUS MATERIALS
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2021
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IF 10.588
Jun Shang,Yanni Guo,Deliang He,Wei Qu,Yining Tang,Lei Zhou,Rilong Zhu
A novel graphene oxide-dicationic ionic liquid composite (GO-DIL) was prepared by modifying graphene oxide (GO) with a dicationic ionic liquid (DIL), 3,3′-(butane-1,4-diyl) bis (1-methyl-1H-imidazol-3-ium) chloride ([C 4 (MIM) 2 ]Cl 2 ). GO and GO-DIL were characterized by SEM, BET, FTIR, and XPS, and the materials were used for Cr(VI) adsorption. Batch adsorption studies showed that adsorption reached equilibrium within 40 min, and the optimal pH was 3, where the electrostatic attraction between GO-DIL and Cr(VI) was maximized. The maximum theoretical Cr(VI) adsorption capacity ( q m ) was 271.08 mg g −1 , and q m remained above 228.00 mg g −1 after five cycles. The adsorption data were fitted well by both the pseudo-first-order kinetic model and the Langmuir model. Furthermore, thermodynamics calculations revealed that adsorption was a spontaneous endothermic process. Importantly, electrostatic attraction between Cr(VI) and the protonated imidazole N + of GO-DIL played a critical role in Cr(VI) adsorption, and Cr(VI) was reduced to Cr(III). Thus, GO-DIL is predicted to be an effective adsorbent for Cr(VI) and other heavy metal ions in wastewater.
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ACS Applied Energy Materials
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2021
·
IF 6.024
Minzhi Du,Xinyi Chen,Kun Zhang
Ionic liquids (ILs) have been reported to modulate the thermoelectric properties of conducting polymers. However, there is still a lack of comprehensive understanding of the effects of ILs on their thermoelectric transport. Herein, we selected 1-ethyl-3-methylimidazolium dicyanamide (EMIM:DCA) to post-treat free-standing PEDOT nanowire (NW) films and the effects on thermoelectric performance were fully explored. EMIM:DCA post-treatment simultaneously increases the Seebeck coefficient (87% increment) and electrical conductivity (24% increment) of PEDOT NWs, resulting in an optimal power factor of 83.8 μW m–1 K–2 at room temperature. It demonstrates the first ever-reported free-standing IL/polymer composites and outperforms the majority of all IL/polymer composites. Based on experimental characterizations, we elucidate that IL-induced dedoping and the Soret effect synchronously determine the Seebeck coefficient enhancement, where the Soret effect plays a dominant role, accounting for 79.9% for PEDOT NW films with 80 wt % EMIM:DCA. By means of X-ray photoelectron spectroscopy (XPS), ultraviolet photoelectron spectroscopy (UPS), and X-ray diffraction (XRD), we further confirm that IL-induced dedoping contributes to phase segregation and compact stacking of PEDOT chains, resulting in lowered carrier concentration for the enhanced Seebeck coefficient and facilitating carrier transport for higher electrical conductivity. More importantly, through Kang–Snyder transport modeling, we first find that the improved transport coefficient (σE0) by IL-induced dedoping also contributes to the Seebeck coefficient enhancement, shedding light on the mechanism that can be adopted to design high-performance thermoelectric materials with conducting polymers.
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ACS Applied Materials & Interfaces
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2021
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IF 9.229
Xingang Liu,Yinghao Shang,Jihai Zhang,Chuhong Zhang
Three-dimensional (3D) printing technologies have unparalleled advantages in constructing piezoelectric devices with three-dimensional structures, which are conducive to improving the efficiency of energy harvesting. Among them, fused deposition modeling (FDM) is the most widely used thanks to its low cost and wide range of molding materials. However, as the best piezoelectric polymer, a high electroactive β-phase poly(vinylidene fluoride) (PVDF) piezoelectric device cannot be directly obtained by FDM printing because the β-crystal is unstable at the molten state. Herein, we develop for the first time ionic liquid (IL)-assisted FDM for direct printing of β-PVDF piezoelectric devices. An IL can induce and maintain β crystals during melt extrusion and FDM printing, ensuring that the β-crystal in the printed PVDF device is as high as 98.3%, which is the highest in 3D-printed PVDF as far as we know. Furthermore, the shearing force provided by the FDM facilitates the directional arrangement of the dipoles, resulting in the printed PVDF device having self-polarization characteristics without poling. Finally, the piezoelectric output voltage of the 3D-printed PVDF device is 4.7 times that of the flat PVDF device, and its area current density (17.5 nA cm–2) is more than that of the reported 3D-printed PVDF piezoelectric device in the literature by two orders of magnitude. The one-step 3D printing strategy proposed in this paper can realize the rapid preparation of complex-shaped and lightweight self-polarized β-PVDF-based piezoelectric devices for energy harvesting.
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JOURNAL OF CATALYSIS
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2021
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IF 7.92
Chaoping Li,Su Liu,Yibing Pi,Jingwen Feng,Zewei Liu,Shiye Li,Rong Tan
High oil/water interfacial area together with accessible interfaces for regents is the key to achieving efficient asymmetric catalysis in water. Herein, by taking advantage of the excellent interfacial activity of Janus nanosheets (JNS), as well as the unique compatibility of imidazolium ionic liquid (IL), we developed a series of IL -functionalized amphiphilic Janus mesosilica nanosheets which afford highly accessible reaction interfaces for highly enantioselective sulfoxidation in water. The JNS-typed chiral salen Ti IV catalysts were prepared by selectively decorating hydrophobic chiral salen Ti IV complex on one side of Janus mesosilica nanosheets through the imidazolium-based IL linker. Benefiting from the two-dimensional porous Janus structure, as well as the compatible IL linker, the IL -tagged JNS catalysts afforded high oil/water interfacial areas and highly accessible reaction interface for sulfides and H 2 O 2 , significantly accelerating asymmetric sulfoxidation in water using H 2 O 2 as an oxidant. In addition, they can be facilely recovered for stable reuse by simple centrifugation.
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LIQUID CRYSTALS
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2021
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IF 0
Shuiyang Liu,Guiyang Yan,Jiwei Wang,Jingda Zhou,Lele Bie,Yinggang Jia,Fanbao Meng
Series of oligomeric ionic liquid crystals (OILCs) based on various anions including bromide (Br−), tetrafluoroborate (BF4−), dodecylbenzenesulphonate (A-SO3−) and (+)-10-camphorsulphonate (D-SO3−) are synthesised by use of pyridine-containing monomers, terminal bromo-substituted alkanes and anion replacement reagents. The effect of anions on the chemical structure, liquid-crystalline behaviour, and ionic conductivity is investigated. The OILCs show various mesophases including smectic, hexagonal columnar and bicontinuous cubic phase due to the change in anions. These mesophase types are determined by two incompatible segments derived from ionic mesogens and flexible alkyl chains in the microstructure. For the OILCs based on A-SO3− and D-SO3− anions, a curvature of the interfaces between the layers arises due to the increased size of one segment, resulting in columnar and cubic mesophases. The ionic conductivity is investigated in the way that a lithium ion solution passing through the oriented OILC films at room temperature. For the OILC films with various anions, ionic conductivities of the measuring system increase a little in the order A-SO3− > D-SO3− > BF4−> Br−. The values based on A-SO3− anion films show nearly twofold increase compared with those based on Br- anions, which can be attributed to the effects of both ion migration and ionic channels in the microstructures.
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INDUSTRIAL & ENGINEERING CHEMISTRY RESEARCH
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2021
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IF 3.764
Liu Fan,Baohua Xu,Jie Li,Ruiyi Yan,Yanyan Diao,Chunshan Li
Diethylamine acetate as an ionic liquid is used as a catalyst for the Mannich reaction of propanal and formaldehyde to produce methacrolein. However, catalyst deactivation remains a serious problem that has not been studied. Here, the reaction was carried out using different temperatures, atmospheres, and reagents to probe the catalyst deactivation mechanism. The proposed mechanism was further supported by data from Fourier transform infrared and electrospray ionization tandem mass spectrometry. Based on this mechanism, kinetic study of catalyst deactivation reaction between diethylamine acetate and formaldehyde was conducted in its initial stage at 85–115 °C for 15–60 min, in order to avoid complex situations in the subsequent reaction. Moreover, the kinetics of diethylamine acetate-catalyzed Mannich reaction was examined, and the pre-exponential factor, activation energy, and reaction order of each reactant were calculated by regression. These results contribute to the industrial application of this catalyst.
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JOURNAL OF DISPERSION SCIENCE AND TECHNOLOGY
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2021
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IF 2.262
Shanshan Dai,Minmin Tao,Hongsheng Lu
CO2-responsive wormlike micelles based on ionic liquid 1,1,3,3-tetramethylguanidine-oleic acid (TMG-OA) and cationic surfactant tetradecyl trimethyl ammonium bromide (TTAB) was designed in this work, avoiding the volatileness and flammability of traditional wormlike micelles formed with amines. It provides a new method of preparing CO2-switchable wormlike micelles based on ionic liquid with acidic group. The ionic liquid TMG-OA was prepared by the direct neutralization reaction between TMG and HOA at the molar ratio of 1:1. Due to the excellent stability and switchability demonstrated by thermogravimetry (TGA) and pH, TMG-OA can be treated as nonvolatile surfactant with CO2-responsive acidic group. Then the worm-based viscoelastic fluid is formed by the electrostatic interaction between TTAB and TMG-OA, and the steady and dynamic rheology show that the viscoelastic fluid has CO2-switchable thinning behavior. The switchable behavior is consistent with the reversible transition of microstructure from wormlike micelles to emulsion, which were detected by the dynamic light scattering (DLS) and cryo-transmission electron microscope (Cryo-TEM). The microstructural transition is induced by the reversible conversation between TMG-OA component and HOA component upon CO2 and N2/heat.
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Polymers
·
2021
·Vol. 13
·期 5
·742
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IF 4.329
Wanyu Chen,Siyuan Liu,Le Guo,Guixia Zhang,Heng Zhang,Meng Cao,Lili Wu,Tianxing Xiang,Yong Peng
An ionic liquid-based ionically cross-linked gel polymer electrolyte (GPE-ILs) was successfully synthesized using acrylic acid, 2-diethylaminoethyl methacrylate, methyl methacrylate, and ionic liquids. Electrochromic devices (ECDs) with an architecture of glass/FTO/WO3/GPE-ILs/FTO/glass were fabricated by a laminating technology. The devices showed performances of large optical modulation of 49.9% at 650 nm, short switching times with the coloration time (tc) of 7 s and the bleaching time (tb) of 4 s, high coloration efficiency of 96.2 cm2C−1, and cycling stability of 200 cycles. The GPE-ILs exhibits high ionic conductivity, superior thermal stability and good self-healing ability. GPE-ILs demonstrates an ionic conductivity of 3.19 × 10−3S cm−1at 25 °C and the same ions migration behaviors with most widely used liquid electrolyte between −10 and 80 °C maintains more than 80% of its tensile strength after self-healing and received only 5% weight loss at 300 °C.Keywords:electrochromic device;ionically cross-linked gel;electrolyte;ionic liquids
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高影响因子
LANGMUIR
·
2021
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IF 3.882
Xuelian Wang,Mei Liu,Xueqin Ding
Six hydrophobic magnetic guanidinium ionic liquids (HMILs) were designed and prepared for the extraction of DNA. The physical and thermal properties of the HMILs were characterized using vibrating sample magnetometry, density meter, rotational rheometer, Karl Fischer moisture, Fourier transform infrared spectrometry, and thermogravimetric analysis. Single-stranded DNA and duplex DNA extracted by HMILs can be rapidly collected by a magnet. Three assisted extraction methods, including vortex extraction, mechanical shaking extraction, and ultrasonic extraction, were introduced to extract DNA with HMILs and the extraction efficiencies were evaluated using NanoDrop. Influencing factors of the DNA extraction were comprehensively evaluated, involving the HMIL volume, extraction time, pH, and extraction temperature. The HMIL-based extraction method can well extract DNA from complex matrices and Escherichia coli cell lysates.
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Reaction Kinetics Mechanisms and Catalysis
·
2021
·Vol. 132
·期 2
·859-876
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IF 2.081
Zhou Jiading,Li Weimin,Kong Congcong,Li Dongyang,Cui Zhijian,Xue Yinghao,Lu Yuhan,Ren Qinggong
The 1-(3-sulfopropyl)-3-vinylimidazole inner salt was prepared through the reaction of 1-vinylimidazole and 1,3-propanesultone, and then, it was mixed with different acids to synthesize three kinds of vinylimidazole acidic ionic liquids. The three ionic liquids (ILs) were used as catalysts for the catalytic synthesis of trimethylolpropane trioleate, and the effects of the catalyst amount, reaction time, reaction temperature, and molar ratio of reactants on the catalytic activity were studied. The esterification rates obtained using the three ILs as catalysts could reach 95.82%, 95.37%, and 97.88%. The catalytic kinetics of the synthesized ionic-liquid catalyst was studied, and the activation energies of the forward and reverse reactions were 13.9872 kJ mol −1 and 13.9918 kJ mol −1 , and the pre-exponential factors were 2.781 × 10 –2 L mol −1 h −1 and 4.835 × 10 –5 L mol −1 h −1 , respectively. The vinylimidazole acidic ILs showed good catalytic activity in the esterification reaction; thus, the catalysts are suitable for esterification reaction systems and valuable for research. Moreover, the existence of double bonds paves a way for the subsequent research on polymerized ionic liquids.
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ULTRASONICS SONOCHEMISTRY
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2021
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IF 7.491
Wenxue Zhang,Liurong Huang,Wenwen Chen,Jiale Wang,Shiheng Wang
In this work, the effect of dual-frequency ultrasound-assisted ionic liquids (ILs) pretreatment on the functional properties of soy protein isolate (SPI) hydrolysates was investigated. The degree of hydrolysis (DH) of SPI pretreated by ultrasound and [BMIM][PF 6 ] increased by 12.53% as compared to control ( P < 0.05). More peptides with low molecular weight were obtained, providing support for the changes in DH. The trichloroacetic acid-nitrogen soluble index presented an increase, suggesting a better protein hydrolysate property. The increase in the calcium-binding activity showed the ultrasound-assisted ILs pretreatment could potentially improve bone health. The foaming capacity and stability of SPI hydrolysates pretreated by ultrasound-assisted [BMIM][PF 6 ] always increased remarkably as compared to ultrasound-assisted [BDMIM][Cl] pretreatment. However, the synergistic effect of ultrasound-assisted [BMIM][PF 6 ] on the emulsifying activity and antioxidant activities (DPPH and hydroxyl radical scavenging activity) was not as ideal as ultrasound-assisted [BDMIM][Cl] pretreatment, which may be affected by the structure of peptide. In conclusion, these results indicated the combination of dual-frequency ultrasound and ionic liquids would be a promising method to improve the functional properties of SPI hydrolysates and broaden the application scope of compound modification in proteolysis industry.
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NEW JOURNAL OF CHEMISTRY
·
2021
·Vol. 45
·期 10
·4611-4616
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IF 3.591
Zheng Wang,Da Li,Shangqing Chen,Jiayin Hu,Yanxi Gong,Yafei Guo,Tianlong Deng
The green basic IL [DBUH][BO2] was easily synthesized for the first time and used to catalyze the cycloaddition of CO2 and epoxides under solvent- and halogen-free conditions at atmospheric pressure and room temperature with high target product yields. Moreover, this IL could be easily recovered and reused at least five times without activity loss. The basic anion and the cation with N–H had excellent synergistic catalytic effects on promoting these reactions. Particularly, this basic IL, the anion of which had a strong nucleophilic ability, was also very effective for the reactions of CO2 and 2-aminobenzonitriles into quinazoline-2,4(1H,3H)-diones, giving the desired products in high yields at atmospheric pressure and room temperature.
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危险品化学品经营许可证（带存储）