TC removal in the presence of various ions; operating conditions: TC initial concentration 5 mg/L, catalyst dosage 4 g/L, pH 7, time 10 min, and under irradiation of 125 W LED lamp; solutions: (A) TC, (B) TC, Na+, Cl−; (C) TC, Mg2+, NO3−, (D) TC, Na+, Cl−, Mg2+, NO3−, (E) TC, tap water.