▎ 摘　　要

NOVELTY - Preparation of nano-magnetic poly-lysine/(graphene-carbon nanotubes) biosorption material involves adding solution of ferric chloride hexahydrate and ferrous sulfate heptahydrate to graphene-carbon nanotube suspension, then dripping sodium hydroxide solution and depositing ferric sulfate magnetic particles on surface of the graphene-carbon nanotube, adding polylysine, N-(3-dimethylaminopropyl)-N'-ethylcarbodiimide hydrochloride and 1-hydroxy-2,5-pyrrolidinedione, to magnetic (graphene-carbon nanotube) suspension, cross-linking, separating, washing and drying. USE - Preparation of nano-magnetic poly-lysine/(graphene-carbon nanotubes) biosorption material used for industrial wastewater treatment. ADVANTAGE - The method efficiently and economically provides nano-magnetic poly-lysine/(graphene-carbon nanotubes) biosorption material having large specific surface area and rich adsorption sites, excellent water-solubility and stability. The adsorption capacity of the adsorbent to divalent lead ion is maximum 374.53 mg.g-1. The maximum adsorption capacity of methylene blue is 549.45 mg.g-1. The maximum adsorption capacity of lemon yellow is 432.9 mg.g-1. DETAILED DESCRIPTION - Preparation of nano-magnetic poly-lysine/(graphene-carbon nanotubes) biosorption material involves mixing expanded graphite powder in strong oxidant and mixed acid in presence of oxidation, surface-activating and obtaining graphene oxide with surface containing carboxyl, hydroxy, epoxy and other functional groups, adding graphene oxide and acidified carbon nanotubes in N,N-dimethylformamide solution, such that carbon nanotubes in the oxidation of graphene layers forms cross-linking network, and obtaining graphene-carbon nanotube hybrid with a large specific surface area, adding solution of ferric chloride hexahydrate and ferrous sulfate heptahydrate to graphene-carbon nanotube suspension, then dripping sodium hydroxide solution and depositing ferric sulfate magnetic particles on the surface of the graphene-carbon nanotube, adding polylysine, N-(3-dimethylaminopropyl)-N'-ethylcarbodiimide hydrochloride and 1-hydroxy-2,5-pyrrolidinedione, to magnetic (graphene-carbon nanotube) suspension, cross-linking, separating using external magnetic field, washing and drying.