Fig. 2. Degradation of 2,4-D herbicide solution before, during and after electrolysis at pH: 5 using G/β-PbO₂ electrode in constant current electrolysis processes, that monitoring by cyclic voltammetry technique at 100 mV s⁻¹ in 0.1 M Na₂SO₄ and 100 mg L⁻¹ of 2, 4-D on a glassy carbon electrode.