N-TiO2-x@MoS2 is prepared by a hydrothermal method with a chemical reduction route.
The N-TiO2-x@MoS2 exhibits a 3D core-shell heterojunction structure.
The synergistic effect is between N and Ti3+ co-doping and coupling with MoS2.
The N-TiO2-x@MoS2 can effectively improve visible-light photocatalytic activity.