▎ 摘　　要

NOVELTY - Nanocomposite material comprises graphene oxide, where the surface of the graphene oxide is loaded with transition metal ions. USE - Nanocomposite material used for efficiently removing arsenic in wastewater. ADVANTAGE - The nanocomposite material has good adsorption performance, obviously improves the removing rate of the graphene oxide to the arsenic in the water. DETAILED DESCRIPTION - INDEPENDENT CLAIMS are included for the following: (1) a method for preparing a nanocomposite material, which involves dissolving the transition metal salt in water, and then ultrasonically dispersing to obtain a transition metal salt dispersion for use, dissolving the graphene oxide in water, and then ultrasonically dispersing to obtain a graphene oxide dispersion for use and mixing the transition metal salt dispersion liquid and the graphene oxide dispersion liquid to obtain a mixed liquid, stirring mixed liquid and reacting at 10-60 degrees C for 1-60 hours, and then centrifuging, washing and drying to obtain product; and (2) a method for efficiently removing arsenic in wastewater, which involves adding nano-composite material to the arsenic-containing waste water or firstly adding the graphene oxide into the waste water containing transition metal ion, processing to obtain the processing liquid, introducing the processing liquid into the arsenic-containing waste water, so as to remove arsenic in the arsenic-containing waste water.