Connecting microscopic structures, meso-scale assemblies, and macroscopic Architectures in 3D-printed hierarchical porous covalent organic framework foams

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Mohammed, A.K., Usgaonkar, S., Kanheerampockil, F., Karak, S., Halder, A., Tharkar, M.S., Addicoat, M.A. ORCID: 0000-0002-5406-7927, Ajithkumar, T.G. and Banerjee, R., 2020. Connecting microscopic structures, meso-scale assemblies, and macroscopic Architectures in 3D-printed hierarchical porous covalent organic framework foams. Journal of the American Chemical Society, 142 (18), pp. 8252-8261. ISSN 0002-7863

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Official URL: https://doi.org/10.1021/jacs.0c00555

Abstract

The induction of macro and mesopores into two-dimensional porous covalent organic frameworks (COFs) could enhance the exposure of the intrinsic micropores toward the pollutant environment, thereby, improving the performance. However, the challenge is to build a continuous hierarchically porous macro-architecture of crystalline organic materials in the bulk scale. In this regard, we have strategized a novel synthetic method to create hierarchically porous COF foams consisting of ordered micropores (2–2.2 nm) and disordered meso and macropores (50 nm to 200 μm) as well as ordered macropores (1.5 mm to 2 cm). Herein, graphene oxide was used for creating disordered macro and mesopores in COF-GO foams. Considering the rheological features of the precursor hydrogel, we could integrate crystalline and porous COF-GO foams into self-supported three-dimensional (3D)-printed objects with the desired shapes and sizes. Therefore, we have engineered the 3D macro-architecture of COF-GO foams into complex geometries keeping their structural order and continuous porosity intact over a range of more than a million (10–9 m to 10–3 m). The interconnected 3D openings in these COF-GO foams further enhance the rapid and efficient uptake of organic and inorganic pollutants from water (>95% removal within 30 s). The abundant distribution of interconnected macroporous volume (55%) throughout the COF-GO foam matrix enhances the flow of water (1.13 × 10–3 m·s–1) which results in efficient mass transport and adsorption.

Item Type:

Journal article

Publication Title:

Journal of the American Chemical Society

Creators:

Mohammed, A.K., Usgaonkar, S., Kanheerampockil, F., Karak, S., Halder, A., Tharkar, M.S., Addicoat, M.A., Ajithkumar, T.G. and Banerjee, R.

Publisher:

American Chemical Society (ACS)

Date:

6 May 2020

Volume:

142