Investigation on UV Degradation and Mechanism of 6:2 Fluorotelomer Sulfonamide Alkyl Betaine, Based on Model Compound Perfluorooctanoic Acid

Опубликована: Янв. 24, 2024

Our investigation focused on the degradation of perfluorooctanoic acid (PFOA) and 6:2 fluorotelomer sulfonamide alkyl betaine (6:2 FTAB, Capstone B), using UV photolysis under various pH conditions. Initially, we used PFOA as a reference, finding 90% decomposition after 360 minutes at original (unadjusted) 5.6, with rate constant (1.08 ± 0.30) × 10-4 sec-1 half-life 107 2 minutes. At 4 7, averaged 85% 80%, respectively, while 10, it reduced to 57%. For FTAB its natural 6.5, almost complete occurred. The primary transformation product was identified sulfonic FTSA), occasionally accompanied by shorter-chain perfluoroalkyl acids (PFAA). Interestingly, overall percentages were unaffected for though influenced constants half-lives. In degradation, direct reaction hydrated electrons presumed mechanisms, excluding involvement hydroxyl radicals. role superoxide radicals remains uncertain. both indirect observed, potential hydroxyl, radicals, and/or other reactive oxygen species (ROS). Clarification is needed regarding eaq- in FTAB.

Язык: Английский

Water-activation-facilitated photocatalytic CO2 reduction by a heterogeneous synergetic single-atomic Zn sites and Pd nanocrystals

Journal of Alloys and Compounds, Год журнала: 2023, Номер 976, С. 173112 - 173112

Опубликована: Дек. 12, 2023

Язык: Английский