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Effects of structural crystallinity and defects in microporous Al-MOF filled chitosan mixed matrix membranes for pervaporation of water/ethanol mixtures
Journal of the Taiwan Institute of Chemical Engineers ( IF 5.5 ) Pub Date : 2017-12-08 , DOI: 10.1016/j.jtice.2017.11.007
Madhan Vinu , Duraisamy Senthil Raja , Yue-Chun Jiang , Ting-Yu Liu , Ya-Yun Xie , Yi-Feng Lin , Chun-Chuen Yang , Chia-Her Lin , Saad M. Alshehri , Tansir Ahamad , Rahul R. Salunkhe , Yusuke Yamauchi , Yu-Heng Deng , Kevin C.-W. Wu

A new two-dimensional microporous metal organic framework (MOF), Al-MOF, [Al(OH)(MBA)] (CYCU-7, MBA = diphenylmethane-4,4′-dicarboxylate anion) and its reported analogue, [Al(OH)(SBA)] (CAU-11, SBA = 4,4′-sulfonyldibenzoate anion), have been synthesized using hydrothermal and solvothermal methods, respectively, and their structural crystallinities and defect porosities were carefully controlled and characterized by N2 sorption isotherms and 27Al solid-state nuclear magnetic resonance measurements. Interestingly, the MOF synthesized by the ethanol-based solvothermal method (CYCU-7) show a significant degree of linker-missing defects compared to that synthesized by the water-based hydrothermal method (CAU-11). We further incorporated the synthesized CYCU-7 and CAU-11 with chitosan (CS) biopolymer to make [email protected] and [email protected] mixed matrix membranes (MMMs) with the loading amount of MOF 2.5, 5.0, or 10 wt%. The as-prepared [email protected] and [email protected] MMMs were applied for separation of water/ethanol mixtures through the pervaporation process, and the effects of the structural properties (e.g. crystallinity and defects) of CYCU-7 and CAU-11 on the separation performance are studied. It is found that defect-rich [email protected] MMMs exhibit higher flux, while [email protected] MMMs with higher crystallinity exhibit a higher separation factor. In addition, the [email protected] MMM with 5.0 wt% loading of CAU-11 displays the best separation performance (separation factor = 2741 and flux = 458 g/m2 h).



中文翻译:

水/乙醇混合物全蒸发的微孔Al-MOF填充壳聚糖混合基质膜的结构结晶度和缺陷的影响

一种新的二维微孔金属有机骨架(MOF)Al-MOF,[Al(OH)(MBA)](CYCU-7,MBA =二苯基甲烷-4,4'-二羧酸根阴离子)及其报道的类似物[Al (OH)(SBA)](CAU-11,SBA = 4,4'-磺酰二苯甲酸酯阴离子),分别采用水热法和溶剂热法合成,其结构结晶度和缺陷孔隙率经过精心控制,并通过N 2吸附进行表征等温线和27Al固态核磁共振测量。有趣的是,与通过水基水热法(CAU-11)合成的MOF相比,通过乙醇基溶剂热法(CYCU-7)合成的MOF显示出显着程度的接头缺失缺陷。我们进一步将合成的CYCU-7和CAU-11与壳聚糖(CS)生物聚合物结合在一起,制成[电子邮件保护的]和[电子邮件保护的]混合基质膜(MMM),其MOF含量为2.5、5.0或10 wt%。准备好的[受电子邮件保护的]和[受电子邮件保护的] MMM用于通过渗透蒸发过程分离水/乙醇混合物,以及结构性能的影响(例如研究了CYCU-7和CAU-11的结晶度和缺陷对分离性能的影响。发现富含缺陷的[受电子邮件保护的] MMM表现出更高的通量,而具有较高结晶度的[受电子邮件保护的] MMM表现出更高的分离系数。此外,具有5.0 wt%的CAU-11的[受电子邮件保护的] MMM表现出最佳的分离性能(分离系数=​​ 2741和通量= 458 g / m 2  h)。

更新日期:2017-12-08
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