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Remarkably efficient removal of toxic bromate from drinking water with a porphyrin–viologen covalent organic framework

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Abstract

The presence of carcinogenic bromate (BrO3) in drinking water became a global concern and efforts towards its removal mainly focused on addressing the source. Herein, we rationally designed a porphyrin-based covalent organic framework (PV-COF) with a cationic surface to provide electrostatic interactions and a porphyrin core to induce hydrogen bonding interactions for the efficient removal of BrO3 from water. Through H-bonding and electrostatic interactions, PV-COF exhibited an exceptional bromate removal efficiency (maximum adsorption capacity, Qmax: 203.8 mg g−1) with the fastest uptake rate (kads) of 191.45 g mg−1 min−1. The bromate concentration was reduced to far below the allowed concentration in drinking water (10 ppb) within 20 minutes. We studied the relationship between bromate adsorption and COF surface modification by metalation of the porphyrinic core or neutralization of the viologen linkers by chemical reduction. The bromate adsorption mechanism was studied by EDAX mapping and molecular simulations, and it was found that ion exchange and hydrogen bonding formation drive the adsorption. Importantly, PV-COF could be easily recycled several times without compromising its adsorption efficiency.

Graphical abstract: Remarkably efficient removal of toxic bromate from drinking water with a porphyrin–viologen covalent organic framework

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Publication details

The article was received on 16 Sep 2019, accepted on 22 Nov 2019 and first published on 22 Nov 2019


Article type: Edge Article
DOI: 10.1039/C9SC04663A
Chem. Sci., 2020, Advance Article
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    Remarkably efficient removal of toxic bromate from drinking water with a porphyrin–viologen covalent organic framework

    T. Skorjanc, D. Shetty, F. Gándara, L. Ali, J. Raya, G. Das, M. A. Olson and A. Trabolsi, Chem. Sci., 2020, Advance Article , DOI: 10.1039/C9SC04663A

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