Removal of Carbamazepine in Aqueous Solution by CoS(2)/Fe(2+)/PMS Process

Carbamazepine (CBZ), as a typical pharmaceutical and personal care product (PPCP), cannot be efficiently removed by the conventional drinking water and wastewater treatment process. In this work, the CoS(2)/Fe(2+)/PMS process was applied for efficient elimination of CBZ. The CBZ removal efficiency of CoS(2)/Fe(2+)/PMS was 2.5 times and 23 times higher than that of CoS(2)/PMS and Fe(2+)/PMS, respectively. The intensity of DMPO-HO• and DMPO- [Formula: see text] followed the order of Fe(2+)/PMS < CoS(2)/PMS < CoS(2)/Fe(2+)/PMS, also suggesting the CoS(2)/Fe(2+)/PMS process has the highest oxidation activity. The effects of reaction conditions (e.g., CoS(2) dosage, Fe(2+) concentration, PMS concentration, initial CBZ concentration, pH, temperature) and water quality parameters (e.g., [Formula: see text] , [Formula: see text] , [Formula: see text] , [Formula: see text] , [Formula: see text] , humic acid) on the degradation of CBZ were also studied. Response surface methodology analysis was carried out to obtain the best conditions for the removal of CBZ, which are: Fe(2+) = 70 µmol/L, PMS = 240 µmol/L, CoS(2) = 0.59 g/L. The sustainability test demonstrated that the repeated use of CoS(2) for 8 successive cycles resulted in little function decrease (<10%). These findings suggest that CoS(2)/Fe(2+)/PMS may be a promising method for advanced treatment of tailwater from sewage treatment plant.