Journal
JOURNAL OF HAZARDOUS MATERIALS LETTERS
Volume 2, Issue -, Pages -Publisher
ELSEVIER
DOI: 10.1016/j.hazl.2020.100007
Keywords
Per; and polyfluoroalkyl substances (PFASs); Advanced oxidation process; Heterogeneous fenton reactions; Graphene; Nanomaterial-enabled treatment
Categories
Funding
- Great Lakes Research Consortium (GLRC) Small Grants Award [77362, 1153633]
- New York State Department of Environmental Conservation
- National Science Foundation [1905274]
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The study showed that the synthesized rGO-nZVI nanohybrid is more efficient in removing PFASs in water, especially long-chain PFASs. The addition of H2O2 can enhance the treatment performance of PFASs, reducing the concentrations of both short-chain and long-chain PFASs and forming unique PFAS-Fe complexes.
Per- and polyfluoroalkyl substances (PFASs) are exceptionally stable chemicals due to their strong C-F bonds. Nanoscale zero-valent iron (nZVI) particles have the potential to remove and degrade PFASs through redox activity. In this study, we deposited nZVI onto two-dimensional reduced graphene oxide (rGO) nanosheets and tested these synthesized rGO-nZVI nanohybrid (NH) for the treatment of a mixture of short- and long-chain PFASs in water with and without H2O2. All PFASs were removed at a higher efficiency by the rGO-nZVI NH than by the parent materials rGO and nZVI. Notably, the long-chain PFASs were removed at a faster rate than the short-chain PFASs. After a 10 min exposure to the rGO-nZVI NH without H2O2, the long-chain PFASs (perfluorooctane sulfonic acid (PFOS) and perfluorooctanoic acid (PFOA)) were removed by 85 % and 39 %, respectively, while short-chain PFASs (perfluoropentane sulfonic acid and perfluoropentanoic acid) were removed by 19 % and 18 %, respectively. The addition of H2O2 enhanced the PFAS treatment performance by 10-18 %, which can be attributed to the generation of reactive oxygen species by the rGO-nZVI NH. Liquid chromatography high-resolution mass spectrometry analysis confirmed the formation of unique shorter chain and partially defluorinated PFAS-Fe complexes from both PFOS and PFOA.
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