Title: Iron detection and remediation with a functionalized porous polymer applied to environmental water samples

Abstract

Iron is one of the most abundant elements in the environment and in the human body. As an essential nutrient, iron homeostasis is tightly regulated, and iron dysregulation is implicated in numerous pathologies, including neuro-degenerative diseases, atherosclerosis, and diabetes. Endogenous iron pool concentrations are directly linked to iron ion uptake from environmental sources such as drinking water, providing motivation for developing new technologies for assessing iron(II) and iron(III) levels in water. However, conventional methods for measuring aqueous iron pools remain laborious and costly and often require sophisticated equipment and/or additional processing steps to remove the iron ions from the original environmental source. We now report a simplified and accurate chemical platform for capturing and quantifying the iron present in aqueous samples through use of a post-synthetically modified porous aromatic framework (PAF). The ether/thioether-functionalized network polymer, PAF-1–ET, exhibits high selectivity for the uptake of iron(II) and iron(III) over other physiologically and environmentally relevant metal ions. Mössbauer spectroscopy, XANES, and EXAFS measurements provide evidence to support iron(III) coordination to oxygen-based ligands within the material. The polymer is further successfully employed to adsorb and remove iron ions from groundwater, including field sources in West Bengal, India. Combined with an 8-hydroxyquinoline colorimetric indicator, PAF-1–ETmore » enables the simple and direct determination of the iron(II) and iron(III) ion concentrations in these samples, providing a starting point for the design and use of molecularly-functionalized porous materials for potential dual detection and remediation applications.« less

Authors:

Lee, Sumin  ^[1];

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Uliana, Adam  ^[2];

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Taylor, Mercedes K.  ^[1];

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Chakarawet, Khetpakorn ^[1]; Bandaru, Siva Rama Satyam ^[3]; Gul, Sheraz ^[4]; Xu, Jun  ^[2];

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Ackerman, Cheri M. ^[1]; Chatterjee, Ruchira ^[4]; Furukawa, Hiroyasu  ^[1];

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Reimer, Jeffrey A.  ^[5];

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Yano, Junko ^[4]; Gadgil, Ashok ^[3]; Long, Gary J.  ^[6];

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Grandjean, Fernande  ^[6];

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Long, Jeffrey R.  ^[7];

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Chang, Christopher J.  ^[8]

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+ Show Author Affiliations

1. Department of Chemistry, University of California, Berkeley, USA
2. Department of Chemical and Biomolecular Engineering, University of California, Berkeley, USA
3. Department of Civil and Environmental Engineering, University of California, Berkeley, USA
4. Molecular Biophysics and Integrated Bioimaging Division, Lawrence Berkeley National Laboratory, Berkeley, USA
5. Department of Chemical and Biomolecular Engineering, University of California, Berkeley, USA, Materials Sciences Division
6. Department of Chemistry, Missouri University of Science and Technology, University of Missouri, Rolla, USA
7. Department of Chemistry, University of California, Berkeley, USA, Department of Chemical and Biomolecular Engineering
8. Department of Chemistry, University of California, Berkeley, USA, Department of Molecular and Cell Biology

Publication Date:

2019-07-10

Research Org.:

Energy Frontier Research Centers (EFRC) (United States). Center for Gas Separations Relevant to Clean Energy Technologies (CGS); Lawrence Berkeley National Lab. (LBNL), Berkeley, CA (United States)

Sponsoring Org.:

USDOE Office of Science (SC)

OSTI Identifier:

1524484

Alternate Identifier(s):

OSTI ID: 1559810

Grant/Contract Number:  

AC02-05CH11231; SC0001015

Resource Type:

Published Article

Journal Name:

Chemical Science

Additional Journal Information:

Journal Name: Chemical Science Journal Volume: 10 Journal Issue: 27; Journal ID: ISSN 2041-6520

Publisher:

Royal Society of Chemistry (RSC)

Country of Publication:

United Kingdom

Language:

English

Subject:

37 INORGANIC, ORGANIC, PHYSICAL, AND ANALYTICAL CHEMISTRY