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Preparation of Polyoxometalate-based Photo-responsive Membranes for the Photo-activation of Manganese Oxide Catalysts
Published on: August 7, 2018
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Evaluating perfluorooctanesulfonate oxidation in permanganate systems.
Saerom Park1,2,3, Linda S Lee4, Ian Ross5
1Water Cycle Research Center, Korea Institute of Science and Technology, Seoul, South Korea.
Environmental Science and Pollution Research International
|February 9, 2020
Summary
Potassium permanganate (PM) does not destroy perfluorooctane sulfonate (PFOS). Observed PFOS removal in previous studies was due to aggregation and artifacts, not chemical breakdown. Salts may aid in PFOS concentration for water treatment.
Area of Science:
- Environmental Chemistry
- Water Treatment Technologies
Background:
- Perfluorooctane sulfonate (PFOS) is a persistent organic pollutant.
- Potassium permanganate (PM) has been investigated for PFOS degradation, but its efficacy is debated.
Purpose of the Study:
- To critically evaluate the ability of potassium permanganate (PM) to destroy PFOS.
- To investigate the mechanisms of PFOS removal in PM and PM-persulfate (PS) systems.
- To assess the role of catalysts in enhancing PM-based PFOS degradation.
Main Methods:
- Replication of previous experimental conditions for PM and PM-PS systems.
- Analysis of fluoride (F-) and sulfate (SO42-) ion generation.
- Investigation of PFOS distribution and behavior under varying conditions (e.g., subsampling, sonication, filtration).
Main Results:
- No significant PFOS destruction was observed with PM alone or with catalysts.
- Reported evidence of bond breaking (F- and SO42- generation) was inconclusive or attributable to impurities.
- PFOS removal in PM-PS systems was attributed to "salting-out" effects and aggregation, not chemical degradation.
Conclusions:
- Potassium permanganate is ineffective for PFOS destruction.
- Apparent PFOS removal in prior studies resulted from experimental artifacts.
- Salting-out effects may be useful for concentrating PFOS and other per- and polyfluoroalkyl substances (PFAS) in water treatment.
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