One-step synthesis of TiO2/γ-Fe2O3/GO nanocomposites for visible light-driven degradation of ciprofloxacin

A series of TiO2 and y-Fe2O3 co-doped graphene oxide (GO) nanosheets (xTiO(2)/gamma-Fe2O3/GO) were prepared by a facile self-assembly method. The characterization results show that the xTiO2/gamma-Fe2O3/GO have the advantages of narrow band gap energies ( < 2.47 eV), and high structure stability. The incorporation of TiO2 into gamma-Fe2O3/GO composite dramatically enhances the catalytic activity, and the 0.03TiO(2)/gamma-Fe2O3/GO composite exhibits the highest catalytic efficiency (99%) for ciprofloxacin (CIP) degradation (10 mg/L, 50 ml) within 140 min under visible light, which is similar to 1.5 times higher than that of gamma-Fe2O3/GO composite without TiO2. Furthermore, the photo-Fenton like mechanism was proposed by quenching experiment and electrochemistry method. The intermediates of the CIP degradation were analyzed by the assistance of LC-MS technology, which provides insight into the pathway of CIP degradation.