CHEMICAL ENGINEERING SCIENCE
·
2023
·
IF 4.7
Wenji Zheng,Ziheng Li,Yan Dai,Xiangcun Li,Xuehua Ruan,Xiaobin Jiang,Xiujuan Zhang,Gaohong He
The regulation on cage size and CO 2 -philic environment of metal–organic frameworks (MOFs) is essential to improve CO 2 capture. In this work, [Bmim][Tf 2 N] was proposed to position into cages of ZIF-8 to achieve the selective permeation of CO 2 by pore screening and CO 2 adsorption. [Bmim][Tf 2 N] was introduced into cages of ZIF-8 by “adsorption-infiltration” strategy. Due to the strong interaction between [Tf 2 N] − and ZIF-8, the cages present a CO 2 -philic environment, which preferentially attracts CO 2 to enter these cages, ensuring the dissolution selectivity of CO 2 . Besides, the proper cage size tuned by [Bmim][Tf 2 N] provides CO 2 with a faster transport channel due to its smaller average kinetic diameter than N 2 , guaranteeing the diffusion selectivity of CO 2 . Consequently, the CO 2 separation in [Bmim][Tf 2 N]@ZIF-8/Pebax MMMs is intensified. With increasing the [Bmim][Tf 2 N] content in cages of ZIF-8, the pore volume by BET results decreases and the CO 2 adsorption from molecular simulation increases. In response, the CO 2 /N 2 selectivity of [Bmim][Tf 2 N]@ZIF-8/Pebax MMMs is enhanced constantly. Meanwhile, the CO 2 permeability is declined due to the narrowed cage size. All of these results demonstrate the significance of pore screening and CO 2 adsorption induced by [Bmim][Tf 2 N]. Specifically, [Bmim][Tf 2 N] 8 @ZIF-8/Pebax MMM at filler loading of 15 wt% exhibits the CO 2 permeability of 108.3 Barrer and the CO 2 /N 2 selectivity of 86.7, exceeding the 2008 Robeson upper bound. Especially the CO 2 /N 2 selectivity locates at a higher level than those of most reported works, indicating that appropriate tuning of the physicochemical properties within the nanocages of MOFs is significative to improve CO 2 capture.
研究领域:
材料科学
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环境科学
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DOI
高影响因子
Membranes
·
2021
·Vol. 11
·期 1
·35
·
IF 4.106
Jiangfeng Lu,Xu Zhang,Lusheng Xu,Guoliang Zhang,Jiuhan Zheng,Zhaowei Tong,Chong Shen,Qin Meng
Development of mixed matrix membranes (MMMs) with excellent permeance and selectivity applied for gas separation has been the focus of world attention. However, preparation of high-quality MMMs still remains a big challenge due to the lack of enough interfacial interaction. Herein, ionic liquid (IL)-modified UiO-66-NH2filler was first incorporated into microporous organic polymer material (PIM-1) to prepare dense and defect-free mixed matrix membranes via a coating modification and priming technique. IL [bmim][Tf2N] not only improves the hydrophobicity of UiO-66-NH2and facilitates better dispersion of UiO-66-NH2nanoparticles into PIM-1 matrix, but also promotes the affinity between MOFs and polymer, sharply reducing interface non-selective defects of MMMs. By using this strategy, we can not only facilely synthesize high-quality MMMs ignoring non-selective interfacial voids, but also structurally regulate MOF nanoparticles in the polymer substrate and greatly improve interface compatibility and stability of MMMs. The method also gives suitable level of generality for fabrication of versatile defect-free MMMs based on different combination of MOFs and PIMs. The prepared UiO-66-NH2@IL/PIM-1 membrane exhibited outstanding gas separation behavior with large CO2permeation of 8283.4 Barrer and high CO2/N2selectivity of 22.5.Keywords:mixed matrix membrane;amino-functional UiO-66;PIM-1;[bmim][Tf2N];gas separation
研究领域:
材料科学
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化学工程
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DOI
PubMed
高影响因子
ELECTROANALYSIS
·
2026
·Vol. 38
·期 8
·e70215
·
IF 2.6
Xuhai Pan,Tianwei Huang,Yucheng Zhu,Zhixiang Chen,Yahong Liu,Min Hua
Large-scaleapplicationof lithium-ion batteries has been hampered by thermal safety issues associated with organic electrolytes based on carbonates. The development of flame-resistant or noncombustible electrolytes is therefore essential. Recently, researchers have shown increasing interest in novel ionic liquid-based electrolytes. However, pure ionic liquids are unsuitable as electrolyte solvents. 1-Butyl-3-methylimidazolium bis[(trifluoromethyl)sulfonyl]imide ([Bmim]TF 2 N) is a favorable candidate for binary electrolytes owing to its higher conductivity and lower viscosity. Herein, a series of experiments was conducted on binary electrolytes composed of [Bmim]TF 2 N and carbonate-based electrolytes (1 M LiPF 6 in EC/DMC/EMC, 1:1:1 v/v/v). The results revealed that the [Bmim]TF 2 N binary electrolyte outperformed the carbonate electrolyte.The [Bmim]TF 2 N-containing electrolytes exhibited higher total ionic conductivity than the carbonate-based electrolyte under the tested conditions. The binary electrolytes exhibited 6.61% and 11.63% greater flame-retardant efficiencies than the carbonate electrolytes when the [Bmim]TF 2 N concentrations were 20% ([Bmim]TF 2 N-20%) and 40% ([Bmim]TF 2 N-40%), respectively. After 100 cycles, LiFePO 4 batteries employing [Bmim]TF 2 N-20% and [Bmim]TF 2 N-40% delivered capacities of 141.8 and 141.4 mAh g −1 , respectively, with corresponding capacity retention rates that were 3.52% and 4.4% higher than those of the carbonate batteries (132.5 mAh g −1 ). Furthermore, among all the electrolytes tested, the [Bmim]TF 2 N-20% binary electrolyte exhibited the highest charge/discharge capacity under high-rate cycling conditions.
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高影响因子
Surfaces and Interfaces
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2025
·
IF 6.3
Dengping Zhang,XiangYu Zhang,Jing Hu,Wen Wang,Yuqing Lv,Xiao li Qian
Recent years, persulfate (PS) activation has mainly relied on metal ion activation, carbon materials, and their doped counterparts. However, traditional methods exhibit numerous limitations. Ionic liquids (ILs), due to their customizable nature, offer new potential for targeted non-radical catalysis. In this study, 1-butyl-3-methyl-1H-imidazol-3-ium bis((trifluoromethyl)sulfonyl) amide ([Bmim][Tf 2 N]) was used to enhance peroxydisulfate (PDS) activation for degrading oxytetracycline (OTC), achieving almost complete degradation in just 20 minutes. The mechanism revealed that the imidazole ring in the [Bmim][Tf 2 N] cation acts as an electron donor, promoting the cleavage of the O-O bond in the PDS and generating 1 O 2 . And, the iminium nitrogen in the anion acts as an electron acceptor, facilitating the breaking of the S-O bond in the PDS twice in succession, further producing 1 O 2 . This represents a successful application of ILs for PDS activation, providing new insights into designing efficient, targeted catalytic methods.
研究领域:
环境化学
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催化科学
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绿色化学
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高级氧化工艺
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离子液体应用
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DOI
高影响因子
SEPARATION AND PURIFICATION TECHNOLOGY
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2020
·
IF 5.774
Bing Liu,Dan Li,Jie Yao,Hao Sun
This study demonstrated a new method for simultaneously improving the interfacial morphology and gas separation properties of mixed matrix membrane by designing a new type of nanocomposite filler (UiO-66-PEI@[bmim][Tf 2 N]). Nano-sized UiO-66 particle was post-synthetically modified with branched polyethyleneimine (PEI) and then was decorated with ionic liquid. The abundant amino groups in UiO-66-PEI improve the gas separation properties of the MMM due to the affinity between PEI and CO 2 . The ionic liquid acts as a lubricant agent, which is coated on the crystal surface improves the interface morphology of the MMM. Compared to pristine 6FO and MOF/6FO membrane, MOF@IL/6FO membrane has higher gas separation performance. Characterization and gas separation results indicated the UiO-66-PEI@ILs particles were homogeneous dispersed in 6FDA-ODA and promoted CO 2 transport by reversible reaction with amine groups. Consequently, the membrane sample containing 15 wt% loading of the UiO-66-PEI@[bmim][Tf 2 N] filler displayed an optimum CO 2 /CH 4 selectivity of 59.99 for CO 2 and CH 4 mixture gas.
研究领域:
材料科学
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膜技术
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气体分离
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纳米复合材料
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化学工程
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DOI
高影响因子
危险品化学品经营许可证（带存储）