“…Homogenous, or heterogeneous catalysts are the most studied method for persulfate activation. Furthermore, heterogeneous AOPs sometimes are combined with other sources of energy to improve antibiotics removal from wastewater such as ultrasounds, electricity [12] or UV [13][14][15][16]. The use of a mixture of persulfate anions and homogeneous ferrous cations in acidic media has been studied in AOPs [17,18].…”