A Water-Stable Cationic Metal-Organic Framework with Hydrophobic Pore Surfaces as an Efficient Scavenger of Oxo-Anion Pollutants from Water

Subhajit Dutta; Partha Samanta; Biplab Joarder; Sumanta Let; Debanjan Mahato; Ravichandar Babarao; Sujit K Ghosh

doi:10.1021/acsami.0c13563

A Water-Stable Cationic Metal-Organic Framework with Hydrophobic Pore Surfaces as an Efficient Scavenger of Oxo-Anion Pollutants from Water

ACS Appl Mater Interfaces. 2020 Sep 16;12(37):41810-41818. doi: 10.1021/acsami.0c13563. Epub 2020 Sep 4.

Authors

Subhajit Dutta¹, Partha Samanta¹, Biplab Joarder¹, Sumanta Let¹, Debanjan Mahato¹, Ravichandar Babarao^{2

3

4}, Sujit K Ghosh^{1

5}

Affiliations

¹ Department of Chemistry, Indian Institute of Science Education and Research, Dr. Homi Bhabha Road, Pashan, Pune 411008, India.
² School of Science, RMIT University, Melbourne, Melbourne 3001, Australia.
³ Commonwealth Scientific and Industrial Research Organisation (CSIRO) Manufacturing, Clayton, Victoria 3169, Australia.
⁴ Theoretische Chemie, Technische Universität Dresden, Bergstr, 66c, Dresden 01062, Germany.
⁵ Centre for Energy Science, IISER Pune, Dr. Homi Bhabha Road, Pashan, Pune 411008, India.

PMID: 32830959
DOI: 10.1021/acsami.0c13563

Abstract

Water contamination due to heavy metal-based toxic oxo-anions (such as CrO₄^2- and TcO₄^-) is a critical environmental concern that demands immediate mitigation. Herein, we present an effort to counter this issue by a novel chemically stable cationic metal-organic framework (iMOF-2C) with strategic utilization of a ligand with hydrophobic core, known to facilitate such oxo-anion capture process. Moreover, the compound exhibited very fast sieving kinetics for such oxo-anions and a very high uptake capacity for CrO₄^2- (476.3 mg g^-1) and ReO₄^- (691 mg g^-1), while the latter being employed as a surrogate analogue for radioactive TcO₄^- anions. Notably, the compound showed excellent selectivity even in the presence of other competing anions such as NO₃^-, Cl^-, SO₄^2-, ClO₄^-. etc.. Furthermore, the compound possesses excellent reusability (up to 10 cycles) and is also employed to a stationary phase ion column to decontaminate the aforementioned oxo-anions from water.

Keywords: anion exchange; cationic MOFs; column chromatographic separation; hydrophobic surface; ionic metal−organic frameworks (iMOFs); oxo-anion; pollutant capture.