Electrostatic Field in Contact-Electro-Catalysis Driven C-F Bond Cleavage of Perfluoroalkyl Substances.
Angew Chem Int Ed Engl
; 63(19): e202402440, 2024 May 06.
Article
em En
| MEDLINE
| ID: mdl-38426574
ABSTRACT
Perfluoroalkyl substances (PFASs) are persistent and toxic to human health. It is demanding for high-efficient and green technologies to remove PFASs from water. In this study, a novel PFAS treatment technology was developed, utilizing polytetrafluoroethylene (PTFE) particles (1-5â
µm) as the catalyst and a low frequency ultrasound (US, 40â
kHz, 0.3â
W/cm2) for activation. Remarkably, this system can induce near-complete defluorination for different structured PFASs. The underlying mechanism relies on contact electrification between PTFE and water, which induces cumulative electrons on PTFE surface, and creates a high surface voltage (tens of volts). Such high surface voltage can generate abundant reactive oxygen species (ROS, i.e., O2â
-, HOâ
, etc.) and a strong interfacial electrostatic field (IEF of 109~1010â
V/m). Consequently, the strong IEF significantly activates PFAS molecules and reduces the energy barrier of O2â
- nucleophilic reaction. Simultaneously, the co-existence of surface electrons (PTFE*(e-)) and HOâ
enables synergetic reduction and oxidation of PFAS and its intermediates, leading to enhanced and thorough defluorination. The US/PTFE method shows compelling advantages of low energy consumption, zero chemical input, and few harmful intermediates. It offers a new and promising solution for effectively treating the PFAS-contaminated drinking water.
Texto completo:
1
Bases de dados:
MEDLINE
Idioma:
En
Revista:
Angew Chem Int Ed Engl
Ano de publicação:
2024
Tipo de documento:
Article
País de afiliação:
China