Wang Yaye, Wang Yifei, Dong Shuping, Huang Qingguo
Jiangsu Provincial Academy of Environmental Science, State Environmental Protection Key Laboratory of Aquatic Ecosystem Health in the Middle and Lower Reaches of Yangtze River, Nanjing, People's Republic of China.
Department of Crop and Soil Sciences, College of Agricultural and Environmental Sciences, University of Georgia, Griffin, Georgia, United States of America.
PLoS One. 2025 Jan 23;20(1):e0317696. doi: 10.1371/journal.pone.0317696. eCollection 2025.
Previous studies have indicated the great performance of electrooxidation (EO) to mineralize per- and polyfluoroalkyl substances (PFASs) in water, but different anions presented in wastewater may affect the implementation of EO treatment in field applications. This study invetigated EO treatment of perfluorooctane sulfonate (PFOS) and perfluorooctanoic acid (PFOA), two representative perfluoroalkyl acids (PFAAs), using porous Magnéli phase titanium suboxide anodes in electrolyte solutions with different anions present, including NO3-, SO42-, CO32- and PO43-. The experiment results indicate that CO32- enhanced PFAS degradation, while NO3- suppressed the degradation reactions with its concentration higher than 10 mM. SO42- and PO43- exhibited less impact. Further studies with electrochemical characterizations and radical quenching experiments illustrate the mechanisms of how the anions may impact EO performance.
先前的研究表明，电氧化（EO）在矿化水中的全氟和多氟烷基物质（PFASs）方面表现出色，但废水中存在的不同阴离子可能会影响EO处理在实际应用中的实施。本研究使用多孔Magnéli相低价钛氧化物阳极，在存在不同阴离子（包括NO3-、SO42-、CO32-和PO43-）的电解质溶液中，研究了对两种代表性全氟烷基酸（PFAAs）全氟辛烷磺酸（PFOS）和全氟辛酸（PFOA）的EO处理。实验结果表明，CO32-增强了PFAS的降解，而当NO3-浓度高于10 mM时，它会抑制降解反应。SO42-和PO43-的影响较小。通过电化学表征和自由基猝灭实验的进一步研究阐明了阴离子可能影响EO性能的机制。
