Effects of structural crystallinity and defects in microporous Al-MOF filled chitosan mixed matrix membranes for pervaporation of water/ethanol mixtures

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

*Corresponding author for this work

Research output: Contribution to journalArticlepeer-review

43 Citations (Scopus)

Abstract

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 CYCU-7@CS and CAU-11@CS mixed matrix membranes (MMMs) with the loading amount of MOF 2.5, 5.0, or 10 wt%. The as-prepared CYCU-7@CS and CAU-11@CS 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 CYCU-7@CS MMMs exhibit higher flux, while CAU-11@CS MMMs with higher crystallinity exhibit a higher separation factor. In addition, the CAU-11@CS MMM with 5.0 wt% loading of CAU-11 displays the best separation performance (separation factor = 2741 and flux = 458 g/m2 h).

Original languageEnglish
Pages (from-to)143-151
Number of pages9
JournalJournal of the Taiwan Institute of Chemical Engineers
Volume83
DOIs
Publication statusPublished - 2018 Feb
Externally publishedYes

Keywords

  • Chitosan
  • Metal-organic frameworks
  • Mixed matrix membrane
  • Pervaporation process
  • Separation

ASJC Scopus subject areas

  • Chemistry(all)
  • Chemical Engineering(all)

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