Ozonation catalyzed by cerium supported on activated carbon for the degradation of typical pharmaceutical wastewater

• The first study to catalyze ozonation of p-TSA by Ce/AC catalyst.
• The properties of Ce/AC catalyst were analyzed by SEM, EDX, BET and XRD.
• Ce/AC catalyst exhibits good heterogeneous activity in the degradation of p-TSA.
• A possible degradation pathway of p-TSA by catalytic ozonation was proposed.

The catalyst of cerium supported on activated carbon (Ce/AC) for ozonation was prepared and the catalytic activity was evaluated by the degradation of p-toluenesulfonic acid (p-TSA). The results showed that Ce/AC catalyst could not only greatly enhance the degradation of p-TSA but also significantly increase the efficiency of COD removal by ozonation. The COD removal could reach 74.1% with the Ce/AC catalyst at 60 min, while the effects of activated carbon (AC) catalyst and without catalyst were only 62.4% and 50.8%, respectively. The superiority of Ce/AC catalyst was attributed to the fact that cerium increased the generation of hydroxyl radicals (OH), which could react with p-TSA and intermediate to form oxidized products rapidly. Based on the intermediates detected by GC/MS, IC and HPLC, a possible degradation pathway of p-TSA was proposed. Our aim is to provide basic data and theoretical support for pharmaceutical wastewater treatment by catalytic ozonation.