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

Результат исследования: Научные публикации в периодических изданияхстатьярецензирование

Аннотация

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.

Язык оригиналаанглийский
Страницы (с-по)40830-40836
Число страниц7
ЖурналACS Applied Materials and Interfaces
Том13
Номер выпуска34
DOI
СостояниеОпубликовано - 1 сен 2021

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  • 2.05 ТЕХНОЛОГИЯ МАТЕРИАЛОВ

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