The mineralization of perfluorooctanoic acid (PFOA) was investigated in electrochemical oxidation process (EC) with the assistance of low frequency ultrasound (US). The electrochemical degradation of PFOA was enhanced under the synergic effects of Ti/SnO₂–Sb/Ce–PbO₂ anode and US (20 kHz and 52 W). The influences of PFOA initial concentrations on its degradation were studied in EC and US-EC systems, while the effects of applied current densities were investigated in US-EC system. With the assistance of US, the increases of pseudo-first-order kinetic rate constant from 0.017 to 0.031 min⁻¹, defluorination efficiency from 75.9% to 87.9%, mineralization efficiency from 71.9% to 86.1% and mineralization current efficiency from 0.66% to 0.77% were obtained at current density of 15 mA cm⁻² and PFOA initial concentration of 60 mg L⁻¹ during the reaction time of 180 min. The production and quenching of •OH were tested to emphasize the function of US in electrochemical mineralization of PFOA. In US-EC system, the electrochemical degradation performance of PFOA was enhanced not because of cavitation under US, but possibly because of the collapse of bubbles, anode surface cleaning, fast electron transfer on anode and higher •OH production under the assistance of US.

在低频超声（US）的辅助下，在电化学氧化过程（EC）中研究了全氟辛酸（PFOA）的矿化作用。在Ti / SnO ₂ -Sb / Ce-PbO ₂阳极和US（20 kHz和52 W）的协同作用下，PFOA的电化学降解得到增强。在EC和US-EC系统中研究了PFOA初始浓度对其降解的影响，而在US-EC系统中研究了施加电流密度的影响。在美国的协助下，拟一级动力学速率常数从0.017增加到0.031 min ^-1在15 mA cm ^-2的电流密度和PFOA初始浓度为60 mg L ^{-1的条件下}，获得的脱氟效率为75.9％至87.9％，矿化效率为71.9％至86.1％，矿化电流效率为0.66％至0.77％。反应时间为180分钟。测试了•OH的生成和淬灭，以强调US在PFOA电化学矿化中的功能。在US-EC系统中，PFOA的电化学降解性能得到提高的原因不是因为在美国的空化作用下，而是因为气泡的破裂，阳极表面的清洁，阳极上电子的快速转移以及在US协助下更高的•OH生成。