Selective Adsorption and Separation of Xylene Isomers and Benzene/Cyclohexane with Microporous Organic Polymers POP-1

ACS Applied Materials & Interfaces
Huiling TanHonglai Liu

Abstract

The separation of chemical substances with analogous chemical structures and physical properties remains a great challenge. In this work, triptycene-like microporous organic polymers (MOPs), POP-1, was synthesized via choosing 1,4-dimethoxybenzene (DMB) and triptycene as external cross-linkers and building blocks, respectively, and POP-1 was employed to separate xylene isomers and benzene (Bz)/cyclohexane (Cy). Results show that POP-1 has a higher uptake for m-xylene (0.29 g/g) and Bz (1.02 g/g); more intriguingly, their complete separation can be realized within 0.6 min using a column packed with POP-1. The interaction between POP-1 networks and adsorbates was also investigated using theoretical (density functional theory together with noncovalent interaction analysis) and experimental (inverse gas chromatography) approaches. Especially, both results present a good agreement, that is, weak interactions such as CH/π interactions play a dominant role in defining the separation performance of POP-1 for xylene isomers and Bz/Cy mixtures. Our findings suggest that MOPs may open up a new route for separating the chemicals that are similar in structure and size.

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Citations

Feb 6, 2021·International Journal of Biological Macromolecules·Luyan SunHongbing Ji
Mar 31, 2021·Angewandte Chemie·Yaqi Wu, Bert M Weckhuysen
Jun 25, 2021·Chemical Science·Yanjun DingNiveen M Khashab
Dec 4, 2019·ACS Applied Materials & Interfaces·Tingting ChenHonglai Liu
Aug 31, 2021·ACS Applied Materials & Interfaces·Liping YangZhongmin Liu

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