Investigating hydrodynamic cavitation as an efficient means for removal of per- and polyfluoroalkyl substances from solution

Separation and Purification Technology, Год журнала: 2024, Номер 347, С. 127644 - 127644

Опубликована: Апрель 24, 2024

Язык: Английский

---

Hydrothermal Destruction and Defluorination of Trifluoroacetic Acid (TFA)

Опубликована: Ноя. 15, 2023

Per- and polyfluoroalkyl substances (PFAS) have received increased attention due to their environmental prevalence threat public health. Trifluoroacetic acid (TFA) is an ultra-short-chain PFAS the simplest perfluorocarboxylic (PFCA). While US EPA does not currently regulate TFA, its chemical similarity other PFCAs simple molecular structure make it a suitable model compound for studying destruction of PFAS. We show that hydrothermal processing in compressed liquid water degrades TFA at relatively mild conditions (T = 150 – 250 ˚C, P < 30 MPa), initially yielding gaseous products, such as CHF3 CO2, naturally aspirate from solution. Alkali amendment (e.g., NaOH) promotes mineralization CHF3, dissolved fluoride, formate, carbonate species final products. Fluorine carbon balances are closed using Raman spectroscopy fluoride ion selective electrode measurements experiments performed alkaline conditions, where gas yields negligible. Qualitative FTIR analysis allows establishing degradation pathways; however, F-balance could be quantitatively without NaOH amendment. The kinetics under measured, showing little no dependency on concentration, indicating thermal decarboxylation rate-limiting step. A proposed mechanism motivates additional work generalize reaction pathways PFCAs.

Язык: Английский

---

Investigating High Shear Cavitation as an Efficient Means for Removal of Per- and Polyfluoroalkyl Substances from Solution

Опубликована: Янв. 1, 2024

Язык: Английский

---

Regeneration of PFAS-laden granular activated carbon by modified supercritical CO2 extraction

Chemosphere, Год журнала: 2024, Номер 370, С. 143986 - 143986

Опубликована: Дек. 23, 2024

Язык: Английский

---