Highly efficient bromine capture and storage using N-containing porous organic cages

Highly volatile and toxic bromine (Br 2 ) molecules can be utilized safely in various chemical processes when coupled with efficient separation systems. Herein, we present two different N-containing porous organic cages (POCs), covalent cage 3-R (CC3-R) and formaldehyde tied-reduced covalent cage 3...

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Bibliographic Details
Published in:Journal of materials chemistry. A, Materials for energy and sustainability Materials for energy and sustainability, 2022-11, Vol.1 (46), p.2482-24812
Main Authors: Lee, Sunggyu, Kevlishvili, Ilia, Kulik, Heather J, Kim, Hee-Tak, Chung, Yongchul G, Koh, Dong-Yeun
Format: Article
Language:English
Subjects:
Bromine
Cages
Charge transfer
Chemical reactions
Mathematical analysis
Recovery
Sorption
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Summary:Highly volatile and toxic bromine (Br 2 ) molecules can be utilized safely in various chemical processes when coupled with efficient separation systems. Herein, we present two different N-containing porous organic cages (POCs), covalent cage 3-R (CC3-R) and formaldehyde tied-reduced covalent cage 3 (FT-RCC3), for vapor Br 2 capture under ambient conditions. They show outstanding sorption capacities (11.02 mmol g −1 and 11.64 mmol g −1 , respectively) compared with previously reported adsorbents. Reversibility of the Br 2 sorption process has been elucidated experimentally and computationally by identifying bromine species adsorbed at POCs and calculating their binding energies. The strong charge-transfer interactions between adsorbed Br 2 and abundant N atomic sites of the host cages led to the dominant formation of polybromide species (Br 3 − and Br 5 − ). Further host-guest interaction between POCs and polybromides determined the reversibility of the Br 2 sorption process-showing partially reversible (>70% recovery) behavior for CC3-R and irreversible (
ISSN:2050-7488
2050-7496
DOI:10.1039/d2ta05420e