Enhanced Ciprofloxacin Photodegradation of Visible-Light-Driven Z-Scheme g-C3N4/Bi2WO6 Nanocomposites and Interface Effect

Photocatalytic g-C3N4/Bi2WO6 nanocomposites were synthesized by solvothermal method and grind-calcination method, and then the phases, microstructure, components and photodegradation to ciprofloxacin (CIP) were studied in detail. The surface area of g-C3N4/Bi2WO6 nanocomposites decreases with the increasing g-C3N4 content. Bi2WO6 nanoparticles prepared with solvothermal method present the smaller grain size and the higher effective interface with the similar components. The photocatalytic activity of g-C3N4/Bi2WO6 nanocomposites is higher than those of pristine g-C3N4 nanosheets and Bi2WO6 nanoparticles, which the optimized CIP removal percent reaches about 98% in 120 min under visible light irradiation. The Z-scheme g-C3N4/Bi2WO6 heterojunctions facilitate the effective separation and accumulation of photogenerated electrons at conduction band of g-C3N4 and holes at valence band of Bi2WO6, resulting in hydroxyl and superoxide radicals for the redox of CIP. S-CN-40presents the highest CIP removal percent due to the effective heterogeneous interface and C-CN-20 possesses the good application prospects in practice for the simple preparation process.