Visible-light activation of persulfate by TiO2/g-C3N4 photocatalyst toward efficient degradation of micropollutants.

• A novel TiO 2 /g-C 3 N 4 -PS system was proposed for micropollutant degradation. • The TiO 2 /g-C 3 N 4 -PS system exhibits a high efficiency, nonselectivity and great stability. • The effects of different reaction conditions on the degradation rate of AAP were systematically studied. • The addition of PS greatly improved the degradation efficiency and oxidizing performance of the TiO 2 /g-C 3 N 4 system. • The photocatalytic mechanism in the TiO 2 /g-C 3 N 4 -PS system was proposed. A novel TiO 2 /g-C 3 N 4 -PS system was proposed, in which a TiO 2 /g-C 3 N 4 heterojunction was used to activate persulfate (PS) to enhance pollutant photodegradation under visible-light irradiation. In this study, the TiO 2 /g-C 3 N 4 photocatalyst was synthesized by a simple calcination method, and acetaminophen (AAP) was chosen as a model pollutant to test the degradation efficiency of the photocatalytic system. The TiO 2 /g-C 3 N 4 -PS system exhibits an efficient activity for PS activation and a high efficiency for pollutant degradation. The results show that 100 mL of a 5 mg/L AAP solution could be almost completely degraded in 30 min with 0.5 g/L photocatalyst and 2 mM PS, and TOC can be decreased by 82.5% in 60 min. After adding PS, the degradation rate of the TiO 2 /g-C 3 N 4 photocatalytic system was greatly improved by nearly 13 times, compared to the TiO 2 /g-C 3 N 4 system. The radical quenching experiments and electron paramagnetic resonance (EPR) results indicate that SO 4 −, OH and h+ all contribute to eliminating organic compounds. Additionally, the TiO 2 /g-C 3 N 4 -PS photocatalytic system was employed to eliminate other typical micropollutants, such as phenol, bisphenol A and carbamazepine, and experiments were also carried out using real water matrices, and the ideal performance shows that the TiO 2 /g-C 3 N 4 -PS photocatalytic system has a strong nonselective oxidative ability for degrading contaminants. [ABSTRACT FROM AUTHOR]