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The strong stability of Cu–ethylenediaminetetraacetic acid (Cu–EDTA) results in the low decomplexation efficiency by the traditional Fenton process. For breaking this limitation, a three-dimensional electro-Fenton (3D-EF) system was constructed to study the decomplexation of Cu–EDTA at different pH, and the effects of Fe 2+  concentration, particle electrode dosage, current density, and coexisting ions on decomplexation performance were investigated. The results showed that 3D-EF exhibited high pollutant removal efficiency in a wide pH range compared with the traditional electro-Fenton process. The optimal conditions for the removal of Cu–EDTA were as follows: the pH was 7, Fe 2+  was 1 mmol L −1 , granular activated carbon was 2 g L −1 , and current density was 10 mA cm −2 , and the optimum Cu–EDTA removal efficiency reached 90.95%. In addition, the presence of Cl −  slightly improved the decomplexation efficiency, whereas NO 3  −  and HPO 4  2−  inhibited the removal of Cu–EDTA. The kinetics of Cu–EDTA decomplexation in all experimental groups followed the first-order kinetic equation.

Decomplexation Performance of Cu–EDTA and Parameter Optimization by Three-Dimensional Electro-Fenton