Abstract: Fe₃O₄-ZnO composites were prepared with hydrothermal co-precipitation method.Microstructure of the composites was characterized by SEM and XRD.Photo-catalytic and magnetic performance were investigated.Experimental results showed that the morphology of the prepared Fe₃O₄-ZnO composites could be controlled and adjusted by changing the alkali source.Photo-catalysis test results indicated that the Fe₃O₄-ZnO composite prepared with NH₃·H₂O as alkali source displays excellent photo-catalytic activity,and the degradability of dye (methylene blue) using the composite achieves 97.7% within 100 min while after reuse of 3 times the degradability still achieves 96.5%.Notably,it displays good magnetic performance (saturated magnetization intensity achieves 25.881 A·m²/kg).Such materials can be effectively recovered and reclaimed.

Key words: Fe₃O₄-ZnO composites, photo-catalyst, magnetic performance, recycling