Efficient construction of bismuth vanadate-based Z-scheme photocatalyst for simultaneous Cr(VI) reduction and ciprofloxacin oxidation under visible light: Kinetics, degradation pathways and mechanism

•Silver/silver bromide nanoparticles decorated BiVO4 nanosheets were successfully fabricated.•Enhanced ciprofloxacin oxidation and Cr(VI) reduction were realized under visible light.•Effective charge transfer and separation in Z-scheme system was confirmed.•The active species were quantified by radical trapping and ESR tests.•A possible mechanism of the redox performance improvement was elucidated.