3D network-like rGO-MoSe2 modified g-C3N4 nanosheets with Z-scheme heterojunction: Morphology control, heterojunction construct, and boosted photocatalytic performances

•Several rGO-MoSe2 with different morphologies and structures were synthesized by a rGO-assisted solvothermal method.•A novel rGO-MoSe2/g-C3N4 composite with 3D/2D hierarchical structure was constructed.•rGO-MoSe2/g-C3N4 composite showed superior photodegradation of RhB and TC.•rGO between MoSe2 and g-C3N4 serve as a high-speed channel across Z-scheme junction.•rGO promoted Z-scheme MoSe2-based heterojunction mechanism was proposed.