*3.2. Electrochemical Cell*

The electrolytic essays were carried out in a single-compartment electrochemical flow cell. Synthetic wastewater contain the electrolyte (3 g L−<sup>1</sup> of Na2SO4 or 3.7 g L−<sup>1</sup> of NaCl) and antibiotics (100 mg dm−<sup>3</sup> of each). Details of the cell and of the auxiliary equipment can be found elsewhere [52]. Irradiated experiments were carried out using the same fluid-dynamic conditions as the electrolysis setup. For irradiated-electrolysis tests, the UV lamp (Vilber Lourmat filtered lamp, VL-215.MC, with a power of 4 W, Vilber, Marne, France) or the ultrasound (acoustic frequency: 20 kHz (UP200S, Hielscher Ultrasonics GmbH, Hielscher, Berlin, Germany) and 10 MHz (EPOCH 650, Olympus, Barcelona, Spain) were immersed in the reservoir tank.
