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The post-treatment of recycling the fine photocatalyst nanoparticles restricts their application. In this study, a new photocatalytic material was synthesized by immobilizing the N-doped TiO 2  and graphene oxide (GO) composite on polypropylene (PP) (N–TiO 2 /GO/PP) fibre sheet, and characterized based on X-ray diffraction spectroscopy (XRD), Raman spectroscopy and Scanning Electron Microscope (SEM). The photocatalytic activity was evaluated using roxithromycin (ROX) as a typical antibiotic pollutant. XRD, Raman spectra and SEM images proved that N–TiO 2 /GO/PP fibre sheet was successfully synthesized. The photocatalytic degradation of 10 mg L −1  ROX can reach up to 90% and the degradation rate constant was 0.2299 h −1  in surface water with the application amount of TiO 2 /GO/PP fibre sheet of 24.6 cm × 2.7 cm and reaction time of 9 h under the irradiation of simulated sunlight. The application amount of TiO 2 /GO/PP fibre sheet, initial concentration of ROX and water matrix significantly affect the degradation of ROX. A low concentration of natural organic matter (NOM) slightly promoted the degradation of ROX, while a high concentration of NOM significantly inhibited the degradation of ROX. Alkaline condition (pH 8–9) is favourable for the photocatalytic degradation of ROX by TiO 2 /GO/PP fibre sheet. The photocatalytic reactivity of the TiO 2 /GO/PP fibre sheet showed no significant decrease after three runs. Two primary degradation products of ROX were identified and they showed lower ecotoxicity than ROX. The results demonstrate that the new synthesized TiO 2 /GO/PP fibre sheet shows promising application prospects in the treatment of antibiotics in wastewater and surface waters.

environmental technology

Photocatalytic degradation of a typical macrolide antibiotic roxithromycin using polypropylene fibre sheet supported N–TiO 2 /graphene oxide composite materials