▎ 摘　　要

NOVELTY - Absorbing heavy metal comprises fully mixing graphene piece with magnetotactic bacteria in a liquid phase system to form the graphene piece-magnetotactic bacteria three-dimensional composite, adding into sewage containing heavy metal ions; after the three-dimensional composite is fully mixed to reach absorption equilibrium, separating the three-dimensional composite with an additional magnetic field to purify the sewage. USE - A method for absorbing heavy metal. ADVANTAGE - The method is simple and capable of treating the sewage with complex heavy metal ion components such as gold (Au3+), iron (Fe3+), nickel (Ni2+), copper (Cu2+), lead (Pb2+) and chromium (Cr2+) in high concentration with removal rate of more than 90%. The used purification material of graphene piece and magnetotactic bacteria three-dimensional composite can be recycled and reused through a magnetic field. The method is also low in cost, green and environmentally friendly, and produces no secondary pollution.