The research of synthesis of the ZnO-Fe3O4 and its application to the degradation of methylene blue had been done. Composites were made with massa ratio of ZnO to Fe3O4 (1:1), (1:2) and (2:1). The composite results were then characterized using XRD, SEM-EDS and UV-Vis DRS instruments. The results of XRD characterization on the ZnO-Fe3O4 (1:1) composite showed the formation of a typical peak at …