The S-Cu-O bonds boosted efficient photocatalytic degradation of semi-coherent interface Cu2O/Cu7S4 heterojunction

•Semi-coherent interface Cu2O/Cu7S4 heterojunction was constructed by epitaxial growth method.•Semi-coherent interface Cu2O/Cu7S4 heterojunction forms a unique S-Cu-O bonds.•The semi-coherent interface and S-Cu-O bonds jointly promote the degradation of tetracycline.•The removal of tetracycline can reach 95.93% under optimal conditions.•The photodegradation pathway of TC is proposed.