With　the　acceleration　of　industrialization　and　urbanization,　the　treatment　of　organic　pollutants　in　water　bodies　has　become　a　global　problem.　Photocatalytic　technology　is　regarded　as　an　ideal　solution　due　to　its　green　and　efficient　characteristics.　However,　traditional　powder　catalysts　have　the　problem　of　difficult　recovery.　Using　copper　foam　as　the　substrate　to　load　photocatalysts　is　a　feasible　solution.　Cu/CuO/Cu2O　with　a　core-shell　structure　was　prepared　by　a　simple　solvothermal　method　based　on　copper　foam.　Under　visible　light　irradiation,　the　Cu/CuO/Cu2O　catalyst　has　a　high　catalytic　efficiency　for　Congo　red　(95%　within　180　min)　and　a　significant　adsorption　and　degradation　ability　for　tetracycline　hydrochloride.　The　results　of　the　density　functional　theory　calculation　and　electrochemical　tests　reveal　that　a　Schottky　heterojunction　forms　between　Cu2O　and　CuO,　the　band　gap　of　Cu2O　is　0.57　eV,　and　the　free　energy　of　Cu/CuO/Cu2O　is　0.24　eV,　close　to　0　eV,　revealing　the　ternary　composite＇s　possibility　to　evolve　hydrogen.　The　heterojunction　generated　by　Cu2O　and　CuO　improves　the　material＇s　charge　transport　efficiency.　Furthermore,　this　ternary　composite　based　on　copper　foam　easy　to　recycle　and　reuse,　and　can　maintain　nearly　90%　degradation　efficiency　after　8　cycles.　This　concept　offers　a　method　for　planning　and　building　interfaces　in　nanocomposite　structures.　[GRAPHICS]　.