RSC Advances
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2024
·Vol. 14
·期 29
·21151-21157
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IF 3.9
Jianwei Yang,Xianghao Han,Xiao Feng
As an emerging category of crystalline porous materials, covalent organic frameworks (COFs) are primarily synthesized via solvothermal methods. However, achieving rapid synthesis of COFs through this approach poses a significant challenge. To address the issue of slow synthesis, we studied the crystallization process of aminal-linked COFs via the condensation of a cost-effective aldehyde and secondary amine, and successfully expedited the synthesis of COFs within a one-hour duration. Furthermore, gram-scale aminal-linked COFs with abundant ultra-microporous channels demonstrated promising potential for CO2/CH4 separation. This study enables the rapid synthesis of aminal-linked COFs from cheap raw materials, which lays a foundation for their practical applications.
研究领域:
材料科学
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化学工程
✓ 已验证
产品关联
DOI
PubMed
高影响因子
CERAMICS INTERNATIONAL
·
2021
·
IF 4.527
Xiaojuan Lu,Jiankang Hai,Feng Zhang,Xinyu Li,Jing Li
A lithium-ion conductor with microporous channels (p-LATP) was prepared by using templates from a hydrothermal-assisted sol-gel method, and the as-prepared p-LATP was infiltrated to obtain p-LATP and d-LATPs composites in this work. SEM photos showed that the morphologies of p-LATP, d-LATP, and p-LATP and d-LATP composites were quite similar. XRD analysis showed that the crystallographic structures were also similar. TEM examinations revealed that microporous channels existed in the pure p-LATP and the p-LATP and d-LATP composites but not in the pure d-LATP. The total conductivities of the composites were higher than those of the pure p-LATP and pure d-LATP. The enhancement of the total conductivity of the composites was ascribed to the interaction of microporous channels and dense lithium-ion conducting areas. The promising results obtained in this work provide a new way to prepare solid lithium-ion conductors.
研究领域:
材料科学
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电化学
✓ 已验证
产品关联
DOI
高影响因子
SEPARATION AND PURIFICATION TECHNOLOGY
·
2024
·
IF 8.1
Hongkun Yang,Tianyu Wang,Xiaojuan Yan,Ying Chen,Fei Jia,Yiyan Gao,Guanghui Gao
The electrospinning nanofiber membranes modified by nanoparticles can effectively improve anti-oil adhesion and separation performance. However, the low stability of nanoparticles on the fiber membrane surface substantially limits the operational lifespan of the membrane. Herein, poly(vinylidene fluoride) (PVDF) nanofiber membranes with multi-scale microporous channel structures are prepared using coaxial electrospinning and a sacrificial template strategy. Subsequently, iron phytate nanoparticles are grown in situ on the fibers to fill the porous structures by utilizing the hollow and porous nanofibers as a framework. The interlocking structure between the nanoparticles and the porous fibers significantly enhances the stability and durability between nanoparticles and the fiber membrane. Even after being subjected to ultrasonic treatment for 7 h, there is no discernible shedding of nanoparticles from the fiber membrane. The prepared nanofiber membrane demonstrates exceptional superhydrophilicity and underwater superoleophobicity, exhibiting remarkable self-cleaning capability and resistance to crude oil contamination. Additionally, the membrane efficiently separates various oil-in-water emulsions, achieving a high separation efficiency of over 99%. Moreover, the membrane also demonstrates excellent adsorption capability towards cationic dyes. Therefore, this interlocking structure composed of nanoparticles and nanofibers presents new ideas and insights for the preparation of high-performance and durable oil–water separation membranes.
研究领域:
材料科学
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环境工程
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纳米技术
✓ 已验证
产品关联
DOI
高影响因子
JOURNAL OF RARE EARTHS
·
2024
·
IF 5.2
Chen Di-Ming,Han-Dong Qiao,Shao-Ming Fang
Introduction of porosity and fluorescent properties into lanthanide metal–organic frameworks (MOFs) with rational design to achieve multifunctional use is of great significance from the energy and environmental viewpoint. In this study, a microporous Tb(III)-based MOF with the formula of {[Tb 2 (oba) 3 (Phen) 2 ](DMF) 2 (H 2 O) 4 } n ( 1 ) was solvothermally prepared via using the mixed ligands of 1,10-phenanthroline (Phen) and 4,4′-oxybis(benzoic acid) (H 2 oba) as organic connecters. The structural evaluation results indicate that complex 1 is composed of binuclear Tb 2 (CO 2 ) 6 (Phen) 2 clusters which are extended by the oba 2− ligands to afford a two-fold interpenetrated framework with one-dimensional microporous channels along the b -axis. Gas sorption studies show that the activated 1 demonstrates a high ideal adsorption solution theory (IAST) sorption selectivity of 7.4 toward C 2 H 2 in a C 2 H 2 /CO 2 gas mixture, which are further supported by the dynamic breakthrough experiments. The grand canonical Monte Carlo (GCMC) simulation results indicate that the synergistic effects of the H-bond interactions of C 2 H 2 with oba 2− ligands and the C–H···π interactions with Phen ligand contribute to the strong binding of the framework toward C 2 H 2 molecules. What's more, the luminescent measurements reveal that the emission of 1 features both the characteristic peaks of Phen ligand and Tb(III) ion, which could be further applied as a self-calibrating sensor for the Cr(VI) detection in water. To the best of our knowledge, complex 1 represents the first example of Tb-MOF holding such a high C 2 H 2 /CO 2 selectivity together with ratiometric Cr(VI) detection performances.
研究领域:
材料科学
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环境科学
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化学
✓ 已验证
产品关联
DOI
高影响因子
ACS Applied Nano Materials
·
2023
·
IF 5.9
Ke Du,Zhizheng Sheng,He Li,Lou Gao,Tianlan Yan,Jiayu Yu,Di Pan,Zhichao Tan,Songhai Xie,Jing Ju,Yahong Zhang,Yi Tang
Constructing zeolite catalysts with excellent mass transfer and active site accessibility is the key to improving their catalytic efficiencies. Herein, a zeolite subcrystal catalyst with high short-range ordering but X-ray amorphism is prepared to minimize the existing molecular mass-transfer barrier of conventional zeolite catalysts. Various characterizations confirm its size of smaller than 10 nm, definite MFI framework, complete opened micropore channel, and abundant accessible acid sites. Moreover, physical and chemisorption results reveal that the high short-range ordering MFI zeolite subcrystal possesses negligible intracrystalline diffuse limitation and utmost accessibility for the active site. As anticipated, the zeolite subcrystal catalyst not only demonstrates high cracking efficiency in polyolefin cracking reactions but also exhibits outstanding catalytic activity and resistance to carbon deposition in macromolecular furfuryl alcohol etherification reaction. The controlled MFI zeolite subcrystal catalyst synthesis strategy is expected to extend to a variety of microporous materials.
研究领域:
化学工程
·
催化
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材料科学
✓ 已验证
产品关联
DOI
高影响因子
CHEMICAL ENGINEERING JOURNAL
·
2025
·
IF 13.2
Peng Hu,Mingyuan Jiang,Jialang Hu,Long Li,Gui Shi,Lvming Jin,Yonggang Zhang,Chao Xiong,Hongbing Ji
The efficient separation and purification of natural gas (NG) represents a pivotal industrial procedure. Herein, we rationally designed a hierarchical-discrete MOF (denoted as 1a ) with molecular nanotraps that enable highly efficient C 3 H 8 capture and kinetic separation from light alkane mixtures (CH 4 /C 2 H 6 /C 3 H 8 ). N 2 adsorption analysis and pore visualization reveal hierarchically discrete pore geometries with ultra-submicroporous dimensions of 5.0 × 4.9 Å 2 and 8.3 × 8.2 Å 2 , effectively optimizing the formation of C 3 H 8 -selective molecular nanotraps while improving gas storage and diffusion kinetics through interconnected ultra-submicroporous channels. Significantly, 1a demonstrates exceptional separation performance, with IAST selectivity of equimolar C 3 H 8 /CH 4 and C 2 H 6 /CH 4 for 1a is 575.6 and 34.8 at zero coverage and 298 K, surpassing many well-known MOFs. Dynamic breakthrough experiments confirm the effective separation of ternary CH 4 /C 2 H 6 /C 3 H 8 mixtures and combined density functional theory (DFT) calculations, transient two-dimensional electron-density maps (2D-EDM),etc., reveal the molecular-level host–guest binding mechanisms. This work highlights the importance of multiscale pore cooperation for synergistically enhancing gas storage capacity and diffusion kinetics.
研究领域:
化学工程
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材料科学
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气体分离技术
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纳米多孔材料
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计算化学
✓ 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）