In-situ synthesis of structurally oriented hierarchical UiO-66(–NH2)/CdIn2S4/CaIn2S4 heterostructure with dual S-scheme engineering for photocatalytic renewable H2 production and asulam degradation

•A novel hierarchical UN/CDS/CAS hybrid material is prepared by a low temperature reflux route.•The heterostructure exhibited sulfur vacancy and strong interfacial contact.•Photo-electrochemical analysis confirmed fast channelization of photo-excited charge carriers.•The hybrid material displayed superior ASM degradation (0.02 min−1) and H2 evolution (493-1 µmol g-1h−1) activity.•A dual S-scheme charge migration mechanism accounted for the improved activity.