TY - JOUR
T1 - Strong hydrophobic affinity and enhanced •OH generation boost energy-efficient electrochemical destruction of perfluorooctanoic acid on robust ceramic/PbO2-PTFE anode
AU - Lou, Zimo
AU - Wang, Jiazhe
AU - Wang, Shibin
AU - Xu, Yinghua
AU - Wang, Jianguo
AU - Liu, Bin
AU - Yu, Chaochao
AU - Yu, Jianming
PY - 2022/1/1
Y1 - 2022/1/1
N2 - 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 •OH attack. Ceramic/PbO2-PTFE features stronger hydrophobic affinity with PFOA, and more •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. © 2021 Elsevier B.V.
AB - 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 •OH attack. Ceramic/PbO2-PTFE features stronger hydrophobic affinity with PFOA, and more •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. © 2021 Elsevier B.V.
KW - Ceramic/PbO2-PTFE
KW - Degradation mechanism
KW - Energy-efficient destruction
KW - PFOA
KW - Stability
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UR - https://www.scopus.com/record/pubmetrics.uri?eid=2-s2.0-85126865939&origin=recordpage
U2 - 10.1016/j.seppur.2021.119919
DO - 10.1016/j.seppur.2021.119919
M3 - RGC 21 - Publication in refereed journal
SN - 1383-5866
VL - 280
JO - Separation and Purification Technology
JF - Separation and Purification Technology
M1 - 119919
ER -
