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

Tina Skorjanc; Dinesh Shetty; Felipe Gándara; Liaqat Ali; Jesus Raya; Gobinda Das; Mark A. Olson; Ali Trabolsi

doi:10.1039/c9sc04663a

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

Tina Skorjanc, Dinesh Shetty, Felipe Gándara, Liaqat Ali, Jesus Raya, Gobinda Das, Mark A. Olson, Ali Trabolsi^*

^*Corresponding author for this work

Chemistry

Research output: Contribution to journal › Article › peer-review

63 Scopus citations

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, Q_max: 203.8 mg g^-1) with the fastest uptake rate (k_ads) 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.

Original language	English (US)
Pages (from-to)	845-850
Number of pages	6
Journal	Chemical Science
Volume	11
Issue number	3
DOIs	https://doi.org/10.1039/c9sc04663a
State	Published - 2020

Funding

The research described here was sponsored by New York University Abu Dhabi (NYUAD), UAE. The authors thank NYUAD for its generous support of the research program at NYUAD. The research was carried out by using the Core Technology Platform resources at NYUAD. T. S. would like to acknowledge the Horizon Fellowship in Natural and Physical Sciences awarded by NYU GSAS. F. G. acknowledges the Spanish Ministry of Science, Innovation and Universities for funding through the “Ramón y Cajal” program. The authors are grateful to Christina Johnson for providing the graphic material.

ASJC Scopus subject areas

General Chemistry

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title = "Remarkably efficient removal of toxic bromate from drinking water with a porphyrin-viologen covalent organic framework",

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.",

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AU - Raya, Jesus

AU - Das, Gobinda

AU - Olson, Mark A.

AU - Trabolsi, Ali

PY - 2020

Y1 - 2020

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AB - 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.

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

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