Perfluoroalkyl substances (PFAS) have unique properties that limit their degradability in the environment. One of these PFAS is an acid (PFOA). Electrochemical oxidation is a promising method for remediation, but energy costs are high. To limit the energy consumption, this study used a boron‐doped diamond (BDD) electrode stack and a combined current density technique that employed 50 mA/cm² for the first 0.25 hours then lowered the current density to 1, 5, or 10 mA/cm². This technique is similar to one developed previously; however, that method was only developed for compounds comprising of carbon, oxygen and nitrogen, whereas PFAS have the addition of fluorine. For the degradation of PFOA, the combined current density of 50 and 5 mA/cm² (50&5) allowed for a 37% reduction in energy usage to obtain 75% defluorination compared to using 50 mA/cm² alone. Further investigation into remediating an ion‐exchange regeneration solution shows great promise.

中文翻译：

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结合电流密度技术与掺硼金刚石电化学氧化全氟辛酸（PFOA）

全氟烷基物质（PFAS）具有独特的特性，限制了它们在环境中的降解性。这些PFAS之一是酸（PFOA）。电化学氧化是一种有前途的修复方法，但是能源成本很高。为了限制能耗，本研究使用了掺硼金刚石（BDD）电极堆和组合电流密度技术，该技术在开始的0.25小时内采用50 mA / cm ²的电流，然后将电流密度降低至1、5或10 mA / cm ²。此技术类似于先前开发的技术。但是，该方法仅针对包含碳，氧和氮的化合物而开发，而PFAS中添加了氟。对于PFOA的降解，合并电流密度分别为50和5 mA / cm ²（50＆5）与仅使用50 mA / cm ²相比，可减少37％的能耗，从而获得75％的脱氟。进一步研究修复离子交换再生解决方案显示出了广阔的前景。