Treatment of perfluoroalkyl acids by electrochemical oxidation using Magnéli phase Ti 4O7 anodes
A recent study, published in the Chemical Engineering Journal, of the treatment of PFAS using Ti4O7 anodes in electrochemical systems has shown promising results for onsite treatment.
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The results of this study highlight the potential of electro oxidation for the effective treatment of PFASs in still bottoms using a Magnéli phase Ti 4O7 anode. In still bottoms I (MeOH/NaCl regenerant for IXR regeneration), the total removal of the 10 monitored PFAAs compounds was 60.9% after 40 h of EO treatment, with the degradation of PFOA and PFOS over 90.0% (Table S1). Oxidation of Cl − led to the formation of ClO 3 − and ClO 4 − in this solution. The study demonstrates residual methanol in the still bottom can inhibit the formation of ClO 3 − and ClO 4 − , because methanol can quench chlorine radicals, but did not impede the degradation of PFAAs by EO. The total removal of all 10 monitored PFAAs was 98.1% at 200 h of treatment in still bottoms II, which used NaI instead of NaCl as the regenerant salt (Table S1). No formation of ClO 3 − and ClO 4 − was observed in this system, although chloride was detected in still bottom II. Our study indicates the combination of regenerable IXR technology and EO using a Magnéli phase Ti 4O7 anode shows appreciable promise for removing PFASs from water and destroying the PFASs onsite, thereby minimizing the expense and liability associated with disposing of the PFASs containing waste.
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