Effective PFAS degradation by electrochemical oxidation methods-recent progress and requirement

Electrocatalytic water treatment of per- and polyfluoroalkyl substances reduces adsorbable organofluorine and bioaccumulation potential

“…The normalized ratio of TF-F − was significantly higher ( p < 0.05) than the PFOA remaining at all sampling times after 1 hour, which indicated that by-products still contain organofluorine that could be captured by AOF and contribute to LBP. 56 All AOF data points after 0.5 hours and all LBP data points after 1 hour fell between PFOA degradation and TF-F − curve, indicating effective partition of PFOA transformation products onto lipids bilayers. Even at 99% of PFOA degradation, the organofluorine residuals could still attach onto Transil XL beads.…”

“…A calculated residual of orga-nouorine, TF minus F − was obtained, which equals UIOF þ P i n i C i or AOF + NAOF, according to eqn (2) and (3). The normalized ratio of TF-F − was signicantly higher (p < 0.05) than the PFOA remaining at all sampling times aer 1 hour, which indicated that by-products still contain organouorine that could be captured by AOF and contribute to LBP 56. All AOF data points aer 0.5 hours and all LBP data points aer 1 hour fell between PFOA degradation and TF-F − curve, indicating effective partition of PFOA transformation products onto lipids bilayers.…”

Electrochemical Reduction of Perfluorooctanoic Acid (PFOA): An Experimental and Theoretical Approach

“…The amphipathic nature of PFAS by the hydrophobic alkyl and the hydrophilic functional group (e.g., R–OH, RSO 3 – , RCOO – ) gives them exceptional surface properties as surfactants. , The strong C–F bond energy (459.8 kJ mol –1 ) makes them highly stable to thermal and chemical decomposition under typical environmental conditions . For this reason, since the 1940s, PFAS have been utilized in several areas, such as medicine, industry, paint production, aqueous film-forming foams (AFFF), and food packaging and processing, − causing its wide distribution in soil, water, food, and living organisms (animals, plants, and humans) . However, the PFAS presence in water is an important environmental concern because they are easily bioaccumulated and are highly toxic even at low concentrations. − …”

Fast reductive defluorination of branched perfluorooctane sulfonic acids by cobalt phthalocyanine: electrochemical studies and mechanistic insights

“…br-PFOS is susceptible to reductive cleavage of C-F bonds due to the high electronegativity of fluorine atoms. [16][17][18] Ochoa-Herrera et al (2008) and Park et al (2017) evaluated the dehalogenation of technical PFOS (including 24.6% br-PFOS) catalyzed by a cobalt-containing biomolecule, vitamin B 12 (VB 12 ) using Ti III citrate and nanosized zerovalent zinc (nZn 0 ) respectively as the reductants in an alkaline medium at 70 °C. 18,19 Co I , a strong nucleophile, was produced by the reduction of Co III /Co II in VB 12 , that attacked the polar C-F bond to initiate the reaction.…”