▎ 摘　　要

NOVELTY - Manufacturing a hybrid material including graphene and iron oxide, comprises: (a) preparing a graphene oxide; (b) dispersing the graphene oxide in water to prepare a first dispersion; (c) adding a divalent iron and a trivalent iron to the first dispersion to prepare a second dispersion; (d) adjusting a pH of the second dispersion to be 8-11 at 25 degrees C; (e) increasing the temperature of the second dispersion obtained from the step (d) up to 80-110 degrees C; and (f) adding a reducing agent to the second dispersion obtained from the step (e) to prepare the hybrid material. USE - The method is useful for manufacturing a hybrid material, which is useful to remove heavy metal in waste water, where the heavy metal is at least one of arsenic, cadmium, mercury, antimony or bismuth (all claimed). ADVANTAGE - The method: provides the hybrid material, which is magnetic and highly dispersible (claimed), and exhibits excellent pH stability; and provides a uniform and fine hybrid material, hence it is efficient in removing heavy metals in waste water.