Photocatalytic　technology　offers　broad　applications　in　the　treatment　of　cyanobacterial　blooms.　This　study　successfully　synthesized　a　series　of　highly　efficient　Ag2MoO4/ZnSnO3　photocatalysts　through　a　straightforward　hydrothermal　method.　Among　the　synthesized　photocatalysts,　the　35　%　Ag2MoO4-doped　Ag2MoO4/ZnSnO3　exhibited　the　highest　photocatalytic　activity,　achieving　nearly　100　%　algal　removal　within　3　h　under　visible　light　irradiation.　This　composite　also　displays　excellent　reusability　and　chemical　stability,　offering　a　more　effective　and　sustainable　solution　compared　to　traditional　methods　such　as　chemical　coagulation　or　physical　filtration.　The　exceptional　efficiency　results　from　the　potent　oxidative　capabilities　of　various　reactive　oxygen　species,　which　are　generated　through　the　efficient　Z-scheme　electron　transfer　mechanism　facilitated　by　Ag2MoO4/ZnSnO3.　Upon　photocatalytic　process　of　Ag2MoO4/ZnSnO3,　some　algal　cells　became　destabilized　and　sedimented,　with　visibly　damaged　cell　walls.　In　the　initial　stage,　the　photosynthetic　system　was　inhibited,　a　critical　factor　leading　to　algal　cell　death.　The　accumulation　of　reactive　oxygen　species　(ROS)　induced　oxidative　damage,　leading　to　the　collapse　of　the　antioxidant　system,　cell　rupture,　and　continuous　leakage　of　intracellular　electrolytes　(K+,　Ca2+,　Mg2+),　organic　matter,　and　proteins.　Even　after　five　consecutive　cycles,　the　Ag2MoO4/ZnSnO3　photocatalyst　maintained　an　algae　removal　rate　above　95　%,　demonstrating　excellent　reusability　and　stability.　In　conclusion,　Ag2MoO4/ZnSnO3,　as　a　stable　and　efficient　photocatalyst,　presents　a　promising　approach　for　mitigating　harmful　algal　blooms.　©　2025　Elsevier　B.V.