Reductive defluorination of Perfluorooctanesulfonic acid (PFOS) by hydrated electrons generated upon UV irradiation of 3-Indole-acetic-acid in 12-Aminolauric-Modified montmorillonite
| Autor: | Youn Jeong Choi, Chen Li, Danielle Tran, Hailiang Dong, Christopher P. Higgins, Alex Kugler, Cheng Gu, Charles E. Schaefer, Morgan Spraul |
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| Rok vydání: | 2021 |
| Předmět: |
Perfluorooctanesulfonic acid
Environmental Engineering Bicarbonate 0208 environmental biotechnology Inorganic chemistry chemistry.chemical_element Electrons 02 engineering and technology 010501 environmental sciences 01 natural sciences Chloride chemistry.chemical_compound Adsorption medicine Waste Management and Disposal 0105 earth and related environmental sciences Water Science and Technology Civil and Structural Engineering Fluorocarbons Chemistry Ecological Modeling Sorption Pollution 020801 environmental engineering Montmorillonite Alkanesulfonic Acids Fluorine Bentonite Degradation (geology) medicine.drug |
| Zdroj: | Water research. 200 |
| ISSN: | 1879-2448 |
| Popis: | Per-and poly-fluoroalkyl substances (PFASs) are a class of persistent compounds that are resistant to degradation. Here we developed an effective method of degrading perfluorooctanesulfonate (PFOS) by hydrated electrons (eaq−) that are generated from 3-indole-acetic-acid (IAA) upon UV irradiation. The method takes advantage of spatial proximity of IAA and PFOS by their co-sorption to an organic polymer, 12-aminolauric acid (ALA), which was pre-intercalated into the interlayer space of an expandable clay mineral, montmorillonite. The interlayer spacing of this clay nanocomposite is greatly expanded relative to unmodified montmorillonite. The maximum adsorption capacity of IAA and PFOS is 168 and 1550 mmol/kg, respectively. This process achieved 40–70% defluorination of a 10 ppm PFOS solution at neutral pH in a 325 mL vessel. The presence of bicarbonate and chloride ions, or natural groundwater showed a minimal impact on PFOS degradation. Based on identification of prominent degradation products, a degradation pathway is proposed, where the primary degradation process is breakage of the C-F bonds (with fluorine replaced by hydrogen), with some cleavage of the C C bond. This approach provides an alternative for treating concentrated PFAS solutions under ambient conditions. |
| Databáze: | OpenAIRE |
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