Covalently connected core–shell NH2-UiO-66@Br-COFs hybrid materials for CO2 capture and I2 vapor adsorption.

[Display omitted] • A novel covalently connected core–shell NH 2 -UiO-66@Br-COFs hybrid materials was prepared. • Abundant ultramicropores were generated at the core–shell interface. • The hybrid materials had high S BET (966 m2·g−1), V total (0.655 cm3·g−1) and V ultra (0.157 cm3·g−1). • The hybrid materials exhibited much higher CO 2 uptake (169.5 mg·g−1) than NH 2 -UiO-66 and Br-COFs. • The hybrid materials exhibited good I 2 vapor adsorption capacity (3.73 g·g−1). Metal organic frameworks (MOFs)@covalent organic frameworks (COFs) (MOFs@COFs) hybrid materials not only combine the advantages of MOFs and COFs, but the possible synergistic effect at the MOFs-COFs interface can improve the performance of the hybrid materials greatly. Herein, the Br-COFs shell was in-situ grown on the surface of the NH 2 -UiO-66 core by Schiff-based reaction and a kind of novel covalently connected core–shell NH 2 -UiO-66@Br-COFs hybrid materials were prepared accordingly. Unique structure was generated at the core–shell interface which could be effectively adjusted by the coating amount of Br-COFs. In particular, abundant ultramicropores were generated at the interfacial layers as compared with NH 2 -UiO-66 and Br-COFs, and the maximum ultramicropore volume (V ultra) was up to 0.157 cm3·g−1. These produced ultramicropores at the core–shell interface made a great positive contribution to the CO 2 capacity and the maximum CO 2 capacity of the hybrid materials was measured to be 169.5 mg·g−1 at 273 K and 1.0 bar, outperformed the corresponding single MOF and COF. Additionally, the highest I 2 vapor uptake of the hybrid materials was determined to be 3.73 g·g−1 and it increased with the increase of the coating amount of Br-COFs. This work presents the successful regulation of the adsorption performance by the rational fabrication of novel hybrid MOFs@COFs interface. [ABSTRACT FROM AUTHOR]