In situ construction of MnIn2S4/Ti3C2Tx MXene Schottky junction composites for efficient photoreduction and recovery of U(VI)

•The novel MnIn2S4/Ti3C2Tx Schottky junction composites are prepared.•The MnIn2S4/Ti3C2Tx shows the 1.83 g/g extraction capacity for U(VI).•U(VI) can be efficiently reduced over MnIn2S4/Ti3C2Tx in actual seawater.•Schottky junction promotes e− separation while inhibits its backflow at interface.•·O2– species are contributing mainly to U(VI) photocatalytic reduction performance.