Fine-Tuning Window Apertures in ZIF-8/67 Frameworks by Metal Ions and Temperature for High-Efficiency Molecular Sieving of Xylenes

Daniil M. Polyukhov, Artem S. Poryvaev, Aleksandr S. Sukhikh, Sergey A. Gromilov, Matvey V. Fedin

Research output: Contribution to journalArticlepeer-review

Abstract

Separation of structurally similar components from their mixtures is one of the most promising applications of metal-organic frameworks (MOFs). A high efficiency of such molecular sieving requires fine tuning of the MOF structure. In this work, we investigate subtle metal- and temperature-induced changes in window dimensions of zeolitic imidazolate frameworks (ZIF-8(Zn) and ZIF-67(Co)) and apply such structural tuning for efficient separation of xylene isomers (p-, m-, and o-xylenes). The use of Co instead of Zn favorably modifies window geometry: it accelerates the diffusion of all components by a factor of 2-3 while maintaining closely the same separation efficiency as that of ZIF-8(Zn). Outstanding selectivity above 18:1 and faster isolation of demanded p-xylene from the ternary mixture using ZIF-67(Co) have been demonstrated at room temperature, opening new horizons for its energy-efficient xylene separation. More generally, our findings suggest the prospective ways to tune various MOFs for target liquid-state separations.

Original languageEnglish
Pages (from-to)40830-40836
Number of pages7
JournalACS Applied Materials and Interfaces
Volume13
Issue number34
DOIs
Publication statusPublished - 1 Sep 2021

Keywords

  • diffusion
  • MOF
  • molecular sieves
  • tuning
  • xylene separation
  • ZIF-67
  • ZIF-8

OECD FOS+WOS

  • 2.05 MATERIALS ENGINEERING

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