Construction of Z-scheme CuBi2O4/MIL-88A(Fe) heterojunctions with enhanced LED light driven photocatalytic Cr(VI) reduction and antibacterial performance

•CuBi2O4/MIL-88A(Fe) p-n heterojunction was constructed by a ball-milling method.•10%-CuBi2O4/MIL-88A(Fe) displayed optimal Cr(Ⅵ) reduction and antibacterial performance.•DNA leakage happened during the photocatalytic antibacterial process.•A built-in electric field at the interface promoted charge separation and transfer.•A Z-scheme charge transfer mechanism was proposed.