Magnéli phase Ti₄O₇ ceramic materials having extensive interconnecting macropores with an average pore size of 2.6 μm and 21.6% porosity were fabricated using a high-temperature sintering method, and then tested as an anode in a batch mode for electrooxidative mineralization of environmentally persistent poly- and perfluoroalkyl substances (PFASs) such as perfluorooctanoate (PFOA) and perfluorooctanesulfonate (PFOS). Tests were also conducted with other “non-active” electrodes for comparison, including Ce-doped PbO₂ and Ti/BDD electrodes. The results showed that the porous Ti₄O₇ ceramic anode exhibited greater PFOA/PFOS oxidation rates than those of the other electrodes. Only trace amounts of perfluorocarboxylic acid (PFCAs) with shortened chain lengths were observed as intermediates during PFOA mineralization. SO₄²⁻ and F⁻ were recovered as the mineralization products of PFOS electrooxidation, while no organofluorine compounds such as shorter-chain PFCAs were detected in the solution by high-resolution mass spectrometry (HRMS). Possible mechanisms for PFOA/PFOS mineralization over porous Ti₄O₇ ceramic electrode were proposed on the basis of reaction products analysis. In addition, the developed porous Ti₄O₇ ceramic anode was successfully applied to treatment of the still bottom liquid waste containing high concentrations of poly- and perfluoroalkyl substances (PFASs) as well as high chloride and organic content concentrations from the regeneration of ion-exchange resin that had been used for remediation of PFASs-impacted groundwater. The results illustrate the promise of the macroporous Magnéli phase Ti₄O₇ ceramic materials for electrochemical treatment of PFASs in water.

使用高温烧结方法制造了具有广泛的互连大孔，平均孔径为2.6μm，孔隙率为21.6％的Magnéli相Ti ₄ O ₇陶瓷材料，然后以分批方式作为阳极进行测试，以进行环境持久性的电氧化矿化聚和全氟烷基物质（PFAS），例如全氟辛酸酯（PFOA）和全氟辛烷磺酸（PFOS）。还使用其他“非活性”电极（包括Ce掺杂的PbO ₂和Ti / BDD电极）进行了测试以进行比较。结果表明，多孔Ti ₄ O ₇陶瓷阳极表现出比其他电极更高的PFOA / PFOS氧化速率。在PFOA矿化过程中，仅观察到痕量的具有较短链长的全氟羧酸（PFCA）作为中间体。SO ₄ ^2-和F ^-回收作为PFOS电氧化的矿化产品，而作为短链全氟羧酸是在通过高分辨率质谱（HRMS）的溶液检测不到有机氟化合物等。在反应产物分析的基础上，提出了多孔Ti ₄ O ₇陶瓷电极上PFOA / PFOS矿化的可能机理。另外，开发了多孔Ti ₄ O ₇陶瓷阳极已成功地用于处理釜底废液，该废液中含有高浓度的多氟烷基和全氟烷基物质（PFAS），以及来自离子交换树脂再生的高氯化物和有机物浓度，这些离子交换树脂已用于PFAS的修复-受到影响的地下水。结果表明，大孔的Magnéli相Ti ₄ O ₇陶瓷材料有望用于水中PFAS的电化学处理。