For the first time, covalently anchoring size selected silver nanoclusters [Ag₄₄(MNBA)₃₀] on the Bi₂S₃@UiO-66-NH₂ and MoS₂@UiO-66-NH₂ heterojunctions were constructed as novel photocatalysts for photodegradation of methylene blue (MB) dye. The anchoring of Ag₄₄ on MoS₂@UiO-66-NH₂ and Bi₂S₃@UiO-66-NH₂ heterojunctions extended the light absorption of UiO-66-NH₂ to the visible region and improved the transfer and separation of photogenerated charge carriers through the heterojunctions with a unique band gap structure. The UV–Vis-NIR diffuse reflectance spectroscopic analysis confirmed that the optical absorption properties of the UiO-66-NH₂ were shifted from the UV region at 379 nm to the visible region at ~ 705 nm after its doping with Bi₂S₃ nanorods and Ag₄₄ nanoclusters (Bi₂S₃@UiO-66-NH-S-Ag₄₄). The prepared Bi₂S₃@UiO-66-NH-S-Ag₄₄ and MoS₂@UiO-66-NH-S-Ag₄₄ …