期刊
SEPARATION AND PURIFICATION TECHNOLOGY
卷 280, 期 -, 页码 -出版社
ELSEVIER
DOI: 10.1016/j.seppur.2021.119919
关键词
Ceramic/PbO2-PTFE; PFOA; Energy-efficient destruction; Degradation mechanism; Stability
资金
- National Science Foundation of China [22006132, 21576241]
- Zhejiang Provincial Key Research and Development Program [2020C03085]
- Zhejiang University of Technology
The study focuses on developing a novel ceramic/PbO2-PTFE film anode for efficient degradation of PFOA in wastewater. Compared to conventional anodes, this new anode demonstrates superior performance in terms of PFOA removal rate, energy consumption, and fluoride release, as well as longer service life and higher tolerance for free fluorides.
The progress on perfluorooctanoic acid (PFOA) removal from wastewater is of great importance. Electrochemical advanced oxidation processes (EAOPs) are effective, but always trigger concerns involving energy consumption and stability of electrode materials. In this work, a tubular polytetrafluoroethylene (PTFE) doped PbO2 film anode supported over ceramic (ceramic/PbO2-PTFE) was fabricated and used for energy-efficient destruction of ppm-level PFOA. Given initial PFOA concentrations of 20 mg L-1, this anode outcompetes conventional Ti/SnO2-Sb/PbO2 anode with 15-fold in apparent rate constant (kobs), 0.36-fold in electric energy per order of magnitude of PFOA removed (EEO), and 640-fold in released F- by energy consumption per unit ([F-] / E). Experimental results under different potentials and density functional theory (DFT) calculations confirm that PFOA degradation is initiated by direct electron transfer (DET) and enabled by center dot OH attack. Ceramic/PbO2-PTFE features stronger hydrophobic affinity with PFOA, and more center dot OH generation than Ti/SnO2-Sb/PbO2, which boosts its good performance for PFOA degradation/defluorination. This anode exhibits 2.7-fold in service life than conventional Ti/SnO2-Sb/PbO2, and high tolerance for free fluorides, which expands its application for concentrated PFOA in waste stream.
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