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

Journal Article · · Chemical Science
DOI: https://doi.org/10.1039/c9sc01441a · OSTI ID:1524484
ORCiD logo [1]; ORCiD logo [2]; ORCiD logo [1];  [1];  [3];  [4]; ORCiD logo [2];  [1];  [4]; ORCiD logo [1]; ORCiD logo [5];  [6];  [7]; ORCiD logo [8]; ORCiD logo [8]; ORCiD logo [9]; ORCiD logo [10]
  1. Univ. of California, Berkeley, CA (United States). Dept. of Chemistry
  2. Univ. of California, Berkeley, CA (United States). Dept. of Chemical and Biomolecular Engineering;
  3. Univ. of California, Berkeley, CA (United States). Dept. of Civil and Environmental Engineering
  4. Univ. of California, Berkeley, CA (United States). Dept. Molecular Biophysics and Integrated Bioimaging Division
  5. Department of Chemical and Biomolecular Engineering; University of California; Berkeley; USA; Materials Sciences Division
  6. Molecular Biophysics and Integrated Bioimaging Division; Lawrence Berkeley National Laboratory; Berkeley; USA
  7. Department of Civil and Environmental Engineering; University of California; Berkeley; USA
  8. Department of Chemistry; Missouri University of Science and Technology; University of Missouri; Rolla; USA
  9. Department of Chemistry; University of California; Berkeley; USA; Department of Chemical and Biomolecular Engineering
  10. Department of Chemistry; University of California; Berkeley; USA; Department of Molecular and Cell Biology

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–ET 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.

Research Organization:
Energy Frontier Research Centers (EFRC) (United States). Center for Gas Separations Relevant to Clean Energy Technologies (CGS); Lawrence Berkeley National Laboratory (LBNL), Berkeley, CA (United States)
Sponsoring Organization:
USDOE Office of Science (SC); USDOE
Grant/Contract Number:
AC02-05CH11231; SC0001015
OSTI ID:
1524484
Alternate ID(s):
OSTI ID: 1559810
Journal Information:
Chemical Science, Vol. 10, Issue 27; ISSN 2041-6520
Publisher:
Royal Society of ChemistryCopyright Statement
Country of Publication:
United States
Language:
English

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