Piranha solution is a highly acidic mixture of sulfuric acid and hydrogen peroxide. The present study aimed at developing a dimensionally stable anode (DSA), made of titanium metal foil coated with Ruthenium Dioxide (RuO₂), for the electrochemical oxidation of hydrogen peroxide in the presence of strong sulfuric acid under ambient conditions. Results showed that hydrogen peroxide in the piranha solution was fully degraded in 5 h under a constant current of 2 A (or current density of 0.32 A-cm^-2).The oxidation kinetics of hydrogen peroxide followed the Langmuir-Hinshelwood model. The observed rate constant was a function of applied current. The initial current efficiency was 17.5% at 0.5 A (or 0.08 A-cm^-2) and slightly decreased to about 13.5% at applied current between 1.3 and 1.5 A (or current density of 0.208 and 0.24 A-cm^-2). Results showed the capability and feasibility of the electrochemical oxidation process for the recovery of sulfuric acid from the spent piranha solution in semiconductor industrial installations or general laboratories.

食人鱼溶液是硫酸和过氧化氢的高酸性混合物。本研究旨在开发一种尺寸稳定的阳极（DSA），该阳极由涂有二氧化钌（RuO ₂）的钛金属箔制成，用于在环境条件下在强硫酸存在下对过氧化氢进行电化学氧化。结果表明，食人鱼溶液中的过氧化氢在2 A的恒定电流下（或电流密度为0.32 A-cm ^-2）在5小时内被完全降解。过氧化氢的氧化动力学遵循Langmuir-Hinshelwood模型。观察到的速率常数是施加电流的函数。在0.5 A（或0.08 A-cm ^-2）下的初始电流效率为17.5％），并且在1.3至1.5 A（或0.208至0.24 A-cm ^-2的电流密度）之间施加的电流下略微降低至约13.5％。结果表明，在半导体工业设施或一般实验室中，电化学氧化工艺可从食人鱼的废溶液中回收硫酸的能力和可行性。