Methods and systems for electrochemical oxidation of polyfluoroalkyl and perfluroalkyl contaminants
AssigneeUniversity of Georgia Research Foundation, Inc.
InventorsQingguo Huang, Hui Lin, Junfeng Niu
Life of this patent
Estimating the term…
Abstract
The present disclosure provides methods, electrodes, and systems for electrochemical oxidation of polyfluoroalkyl and perfluroalkyl (PFAS) contaminants using Magnéli phase titanium suboxide ceramic electrodes/membranes. Magneli phase titanium suboxide ceramic electrodes/membranes can be porous and can be included in reactive electrochemical membrane filtration systems for filtration, concentration, and oxidation of PFASs and other contaminants.
Claims17
A method for electrochemically oxidizing polyfluoroalkyl and perfluoroalkyl substances (PFASs), the method comprising:
- contacting an aqueous composition contaminated with one or more types of PFASs with a Magnéli phase titanium oxide ceramic electrode comprising one or more Magnéli phase titanium sub-oxides wherein at least one of the Magnéli phase titanium sub-oxides is Ti4O7 or Ti5O9;
- and
- supplying electric current to the Magnéli phase titanium oxide ceramic electrode in an electrochemical cell, whereby the electrode electrochemically oxidizes the PFASs to oxidatively degrade the PFASs into mineral components, inorganic components, or both, wherein the one or more types of PFASs comprise at least one type of perfluoroalkyl acid (PFAA).
A method for electrochemically oxidizing polyfluoroalkyl and perfluoroalkyl substances (PFASs), the method comprising:
- contacting an aqueous composition contaminated with one or more types of PFASs with an electrochemical cell comprising a first Magnéli phase titanium oxide ceramic membrane electrode configured to serve as an anode and a second Magnéli phase titanium oxide ceramic membrane electrode configured to serve as a cathode, wherein the first and second Magnéli phase titanium oxide ceramic membrane electrodes each comprise one or more Magnéli phase titanium sub-oxides wherein at least one of the Magnéli phase titanium sub-oxides is Ti4O7 or Ti5O9;
- and
- supplying electric current to the electrochemical cell such that the first Magnéli phase titanium oxide ceramic membrane electrode electrochemically oxidizes the PFASs to oxidatively degrade the PFASs into mineral components, inorganic components, or both, and the second Magnéli phase titanium oxide ceramic membrane electrode serves as the cathode.
A method for electrochemically oxidizing polyfluoroalkyl and perfluoroalkyl substances (PFASs), the method comprising:
- contacting an aqueous composition contaminated with one or more types of PFASs and trichloroethylene (TCE) with an electrochemical cell comprising a first Magnéli phase titanium oxide ceramic electrode configured to serve as an anode and a second Magnéli phase titanium oxide ceramic membrane electrode configured to serve as a cathode, wherein the first and second Magnéli phase titanium oxide ceramic membrane electrodes each comprise one or more Magnéli phase titanium sub-oxides wherein at least one of the Magnéli phase titanium sub-oxides is Ti4O7 or Ti5O9 and wherein each electrode has at least a portion of the electrode coated with activated carbon fiber (ACF);
- and
- supplying electric current to the electrochemical cell such that the first Magnéli phase titanium oxide ceramic membrane electrode electrochemically oxidizes the PFASs to oxidatively degrade the PFASs into mineral components, inorganic components, or both, and the second Magnéli phase titanium oxide ceramic membrane electrode serves as the cathode and reduces chlorate to Cl−.
Dependencies are inferred from the claim text.