DALTON TRANSACTIONS
·
2019
·Vol. 49
·期 2
·504-510
·
IF 4.052
Hongmei Su,Qi Wang,Ning Wang,Yanzhao Yang
The first gemini-type benzimidazole ionic liquid ([C4-6-C4BIm]Br2) with two sites of action was synthesized and applied for gold extraction. The effects of [C4-6-C4BIm]Br2 concentration, initial gold(III) concentration, acidity, and the loading capacity of [C4-6-C4BIm]Br2 were examined in detail. It was found that [C4-6-C4BIm]Br2 has excellent extraction ability for obtaining high purity gold. The anion exchange mechanism between [C4-6-C4BIm]Br2 and Au(III) was proved by Job's method and 1H NMR and FTIR spectroscopy. Quantum chemical calculations were carried out to prove the mechanism theoretically. The extraction equilibrium process was modeled using Langmuir and Freundlich isotherms. Thermodynamic parameters ΔH, ΔG and ΔS indicated that the extraction process was exothermic and spontaneous. The pseudo-second-order kinetic model well fitted the experimental data (R = 0.99). In addition, [C4-6-C4BIm]Br2 has high selectivity for Au(III) compared to other base metals. In summary, [C4-6-C4BIm]Br2 has great application prospects in industry due to its excellent characteristics such as low cost, easy availability, and high extraction capacity.
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DOI
高影响因子
FUEL
·
2022
·
IF 8.035
Zhaoyang Qi,Huaifang Li,Jie Chen,Changshen Ye,Ting Qiu
The carboxyl functionalized ionic liquid ([mim(CH 2 ) 3 COOH]Cl) was prepared as a linker to combine phosphotungstic acid (HPW) and Zr(IV) ion. The obtained [mim(CH 2 ) 3 COO] 3 PW-Zr composite acted as a heterogeneous catalyst for removing DBT from liquid fuel with H 2 O 2 as an oxidant. As a result, [mim(CH 2 ) 3 COO] 3 PW-Zr possessed high catalytic activity in extractive and catalytic oxidative desulfurization (ECODS). Moreover, the [mim(CH 2 ) 3 COO] 3 PW-Zr was further exploited to grow on the surface of PEI/silica gel. And the fabricated large-grained Zr-PWIL@PEI/silica gel was used in the continuous ECODS process, and the removal of DBT could still reach more than 95% after running continuously for 16 h. More importantly, the synergistic catalytic mechanism between HPW and Zr(IV) in the ECODS process has been investigated in detail by experiments and DFT calculations. As a result, a plausible mechanism has been proposed and verified, which contains two parts: the Lewis acidic center activating H 2 O 2 to form superoxide ion radicals ( OOH), and the OOH oxidizing HPW to peroxotungstate (W(O 2 ) n ), which has a high oxidizability and stability. Thus, the effective combination of Zr(IV) and HPW active sites is a very effective strategy to promote desulfurization efficiency and utilization efficiency of H 2 O 2 . Besides, we also found the distance between the corresponding active sites of catalysts plays an essential role in ECODS reaction as it strongly influences the synergistic effect between different active sites.
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高影响因子
Green Chemical Engineering
·
2021
·
IF 0
Xin Wang,Hao Hu,Bihua Chen,Lulu Dang,Guohua Gao
The synthesis of dimethyl carbonate (DMC) via transesterification of ethylene carbonate (EC) and methanol (MeOH) was an environmental and practical strategy. Herein, poly(ionic liquid)s (PILs) with swelling abilities were synthesized by free radical copolymerization of N -vinylimidazolium ionic liquids, sodium 4-vinylbenzoate and cross-linker 1,8-triethylene glycoldiyl-3,3ʹ-divinylimidazolium bromide ([(EG) 3 -DVIm]Br 2 ). The swelling abilities of PILs in various solvents were measured, and PILs could swell in methanol (MeOH). The swelling ability of PILs in MeOH could be modulated by changing the cross-linker content and chain length of 3-alkyl-substituents on imidazolium. The swollen state of PILs in MeOH presented a porous cross-linked network structure observed by the cryo-scanning electron microscope (cryo-SEM). The swelling PILs were used to catalyze the transesterification of ethylene carbonate (EC) and MeOH to prepare the DMC, and the catalytic activities was correlated with the swelling abilities of PILs. The PIL with 3-butyl-substituent and 2.5 mol% cross-linker (poly[VBIm-VBA-DVIm]-2.5%) had the highest swelling ratio ( Q = 12.4 (g/g)) in MeOH and EC mixed solvents and exhibited excellent catalytic activities, which was similar to corresponding homogeneous ionic liquid. Furthermore, the catalyst could be reused up to seven runs without any considerable loss of its initial activity.
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Frontiers of Materials Science
·
2024
·Vol. 18
·期 1
·1-9
·
IF 2.5
Mao Tianyong,Dai Jing,Xin Meiqing,Zeng Deliang,Xie Zhipeng
Zinc-based flow battery is an energy storage technology with good application prospects because of its advantages of abundant raw materials, low cost, and environmental friendliness. The chemical stability of zinc electrodes exposed to electrolyte is a very important issue for zinc-based batteries. This paper reports on details of chemical stability of the zinc metal exposed to a series of solutions, as well as the relationship between the morphological evolution of zinc electrodes and their properties in an alkaline medium. Chemical corrosion of zinc electrodes by the electrolyte will change their surface morphology. However, we observed that chemical corrosion is not the main contributor to the evolution of zinc electrode surface morphology, but the main contributor is the Zn/Zn 2+ electrode process. The morphological evolution of zinc electrodes was controlled by using ionic liquids, 1-ethyl-3-methylimidazolium acetate (EMIA), and 1-propylsulfonic-3-methylimidazolium tosylate (PSMIT), and the electrode performance was recorded during the morphological evolution process. It was observed that the reversible change of zinc electrode morphology was accompanied by better electrode performance.
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高影响因子
Journal of Environmental Chemical Engineering
·
2022
·
IF 7.968
Si-ruo Chen,Ting Wang,Xinyi Zhuo,Yu-xing Wang,Li-guang Wu
Aiming to enhance permeation and anti-fouling performance of PVDF membrane, IL/PVDF and MXene-IL/PVDF mixed matrix membranes (MMMs) were fabricated by incorporating 1-hexyl-3-methylimidazolium bis (trifluoromethylsulfonyl) imide ionic liquid (IL) and MXene-IL. The microstructures of IL/PVDF and MXene-IL/PVDF MMMs were characterized by TEM, SEM, FTIR, XRD, and XPS analysis. The performance of the MMMs was evaluated in the dead-end filtration, and results showed that IL addition would increase the pore size and hydrophilicity of IL/PVDF MMMs, thereby enhancing water flux and anti-fouling performance of the MMMs. However, IL would be dissolved out from IL/PVDF MMMs during the filtration process, which would depress the flux recovery rate of the MMMs. For MXene-IL/PVDF MMMs, IL was encapsulated by intercalating into the MXene nanosheets and effectively prevented the loss of IL from Mxene-IL/PVDF MMMs in the running process. MXene-IL/PVDF MMMs had high water flux and antifouling performance, and the maximum flux recovery rate of MXene-IL co-incorporated PVDF MMMs reached 96% after four-cycle filtration, and the corresponding water flux was 129.37 L·m −2 ·h −1 . Compared with PVDF membrane, pure water flux and flux recovery rate of MXene-IL/PVDF mixed matrix membranes increased by 4.37 and 1.83 times, respectively.
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高影响因子
PROCESS BIOCHEMISTRY
·
2022
·
IF 4.885
Wenxue Zhang,Isaac Duah Boateng,Wenjing Zhang,Shifang Jia,Tingting Wang,Liurong Huang
The application of dual-frequency ultrasound-assisted ionic liquids (UA-IL) pretreatment on the development of compound modification and produce soy protein isolate (SPI) with excellent functional properties is limited. In this research, the effect of UA-IL on the structure and interfacial properties of SPI were evaluated. The results of UV spectrum and intrinsic fluorescence showed that combined ultrasound and ionic liquids pretreatment could loosen the protein structure and expose more hydrophobic groups that were initially hidden inside the molecules. The SDS-PAGE showed there was no significant change in the primary structure of SPI. Besides, the data from FTIR and DSC suggested that the UA-IL could destroy the hydrogen bond between protein molecules and promote its distribution more uniformly. Moreover, UA-IL (1-butyl-3-methyl imidazolium hexafluorate phosphate, [BMIM][PF 6 ]) pretreatment significantly increased the protein’s solubility, reaching 38.33% at the IL/protein ratio of 0.1. There was also an increasing trend for the emulsion activity, foaming capacity and foaming stability of SPI after the UA-IL pretreatment. The current findings indicated that combining ultrasound and ionic liquids pretreatment might be a promising method to change the SPI structure and interfacial properties.
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高影响因子
SEPARATION AND PURIFICATION TECHNOLOGY
·
2022
·
IF 9.136
Zhenhua Niu,Wenjia Luo,Peng Mu,Jian Li
Membrane separation technology has received widespread attention in the field of gas separation because of small footprint, convenient operation and low energy consumption. However, membranes separation are subject to a trade-off between permeance (or permeability) and selectivity. Herein, a novel kind of supported oinic liquid membrane (SILM) was constructed by nanoconfined 1-ethyl-3-methylimidazole acetate ([EMIm][AcO], IL) in the two-dimentional (2D) channels of the g-C 3 N 4 laminated membrane for CO 2 /N 2 and CO 2 /CH 4 separation. Due to the nanoconfinement of ILs in 2D g-C 3 N 4 laminated membrane and the appropriate nanofluidic channels constructed by the g-C 3 N 4 nanosheets, the as-prepared g-C 3 N 4 SILM possesses outstanding permeance and selectivity for CO 2 in separation of CO 2 /N 2 and CO 2 /CH 4 . The experimental result shows that g-C 3 N 4 SILM possesses maximum CO 2 permeance of 992.97 GPU in separation of CO 2 /N 2 and 1160.52 GPU in separation of CO 2 /CH 4 under 1 bar, 25℃. Meanwhile the resultant g-C 3 N 4 SILM shows excellent selectivity for CO 2 /N 2 (52.49) and CO 2 /CH 4 (48.41) respectively. Moreover, the resulted g-C 3 N 4 SILM displays excellent thermal stability and durability. After 60 h test, its separation performance has no obvious change. The findings of our study demonstrate that nanoconfined the IL into the 2D g-C 3 N 4 is a novel strategy for the preparation of high-performance supported liquid membrane for the separation of CO 2 /N 2 and CO 2 /CH 4 .
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高影响因子
COLLOIDS AND SURFACES A-PHYSICOCHEMICAL AND ENGINEERING ASPECTS
·
2024
·
IF 4.9
Huigui Yang,Lihan Wang,Juan Xu,Li Lin,Yi Liu,Weigang Cui,Yunfei Zhi,Shaoyun Shan,Yingju Miao
Sulfur dioxide (SO 2 ) is one of the primary air pollutants, and its reaction with epoxides to produce sulfur-containing polymers is an efficient means of resource utilization for SO 2 , however, catalysts play a crucial role in this reaction. Polymeric ionic liquids (PILs) have become a hot topic in catalysis research due to their dual characteristics of ionic liquids and polymers. Therefore, a series of heterogeneous PILs were prepared, characterized, and employed for the copolymerization of SO 2 with epoxides in this study. The impact of different halide anions and hydrogen bond donors on catalytic performance was investigated. Optimal reaction conditions for copolymerization were determined by examining reaction temperature, reaction time, molar ratio of catalyst to epoxide, and other factors. Furthermore, PILs demonstrated recyclability for more than 6 cycles without a significant decrease in catalytic activity, and PILs exhibited broad applicability to various epoxides. Finally, density functional theory (DFT) calculations were employed to further elucidate the activation effect of halide anions and hydrogen bond donors on epoxides to propose a potential mechanism for the copolymerization of SO 2 with epoxides catalyzed by PILs.
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高影响因子
Journal of Cleaner Production
·
2022
·
IF 11.072
Jing Bai,Bo Zhang,Bolun Yang,Jianxuan Shang,Zhiqiang Wu
The development of phase change materials with a high latent heat of fusion and thermal conductivity is a key issue that needs to be addressed in power batteries thermal management system . In this study, an imidazolium ionic liquid ([C 16 MIM]Br) suitable for latent heat storage was synthesized by quaternization reaction. The composite phase change material of ionic liquid/graphene/carbon nanotube aerogel was prepared by hydrothermal self-assembly and vacuum impregnation method utilizing the unique π-π interaction between the delocalized electron of the heterocyclic cation of the ionic liquid and the sp 2 bonded carbon materials. The prepared ionic liquid-based phase change materials had high latent heat of phase change, excellent thermal stability, and enhanced thermal conductivity . The thermal conductivity of the composite material reached 0.751 W/(m·K) at a carbon nanotubes addition of 15 wt%, which was 232% higher than that of the pure ionic liquid (0.226 W/(m·K)). The enhancement was attributed to the three-dimensional network in the graphene/multi-walled carbon nanotubes aerogel which was beneficial to improve the dispersion of multi-walled carbon nanotubes in the matrix and promote the uniform penetration of the ionic liquid phase change material. As a result, the designed structure provided effective ways for phonon transmitting and improved the thermal conductivity of the composites.
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高影响因子
INTERNATIONAL JOURNAL OF BIOLOGICAL MACROMOLECULES
·
2019
·
IF 4.784
Haixia Lyu,Jingshuang Fan,Yunxiafei Ling,Yan Yu,Zenghong Xie
In this study, a new ionic liquid functionalized cross-linked chitosan (IL-CCS) was prepared and utilized as an adsorbent for removing sunset yellow FCF (SY) from aqueous solutions. The physicochemical properties of the adsorbent were characterized using infrared spectroscopy (IR), scanning electron microscope (SEM), nitrogen adsorption-desorption isotherms and thermogravimetric analysis (TG). The effects of the experimental parameters such as initial pH, the adsorbent dose and contact time on the absorption process of SY on IL-CCS were investigated in detail. The results showed that the adsorption capacity of IL-CCS for SY had no significant differences when pH of the solution changed from 2.0 to 10.0, and the maximum adsorption capacity of IL-CCS was 300.28 mg/g, obviously higher than that of CCS (36.08 mg/g). In addition, the results of adsorption isotherm, kinetic and thermodynamics showed that the adsorption process could fit with Langmuir model, pseudo-second order model, separately. The exothermic nature of the reaction was revealed through thermodynamic parameters. From the above, IL-CCS has a good prospect for treatment of wastewater containing anionic dyes due to high efficiency adsorption during a broad pH range.
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高影响因子
Reaction Kinetics Mechanisms and Catalysis
·
2019
·Vol. 127
·期 2
·715-726
·
IF 1.428
Zhang Wei-Hong,Zhou Yu-Chen,Du Chen-Hui,Gao Min,Liu Shan-Shan,Liu Ping,Li Yong-Xin
A basic ionic liquid containing aminopropylimidazolium moiety and OH ‒ anion was immobilized on silane-functionalized graphene oxide (GO) by a condensation process, followed by an anion-exchange reaction. The properties of the resulting GO-[Ap-im]OH material were characterized using extensive techniques including FTIR, XPS, AFM, TGA, etc. The material could be used as a transesterification catalyst, affording the expected ester products in good yields under mild reaction conditions. This GO-[Ap-im]OH material with amino groups shows higher activity than GO-[Ap-im]Cl without amino groups. Furthermore, this catalyst could easily be separated from the reaction mixture by filtration and recycled at least 6 times without a noticeable decrease in the catalytic activity. The prominent performance of GO-[Ap-im]OH is attributed to the enhanced basicity of combining amine groups and OH ‒ anions as well as less mass-transfer resistance of laminar GO.
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高影响因子
Science China-Chemistry
·
2013
·Vol. 57
·期 3
·397-401
·
IF 1.327
Zhang QiBo,Hua YiXin,Wang Rui
Direct electroreduction of solid cuprous chloride to prepare copper powder in a “neutral” ambient-temperature ionic liquid, 1-butyl-3-methylimidazolium tetrafluoroborate ionic liquid (BMIMBF 4 ) was investigated. Cyclic voltammetry of the CuCl powder in a Pt-powder cavity microelectrode exhibited that solid CuCl can be electrochemical reduced in the ionic liquid. Chronoamperometry of the salt powder filled Mo-cavity electrode (current collector) in the ionic liquid further demonstrated the conversion of chloride-to metal inside the cavity, as confirmed by scanning electron microscopy, energy-dispersive X-ray, and X-ray diffraction spectra.
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高影响因子
危险品化学品经营许可证（带存储）