▎ 摘　　要

NOVELTY - The preparation method of nickel hydroxide-graphene composite nano-material involves (A) oxidizing graphite to obtain oxidized graphene, (B) taking oxidized graphene obtained in step (a) to prepare suspension, adjusting pH to 9.5-10.5, heating with stirring at 85-95 degrees C, adding reducing agent to carry out water bath reduction to obtain multi-layer graphene oxide original solution, mixing multi-layer graphene oxide solution and divalent nickel ion solution, adding weak alkaline solution to adjust pH to 9-11, heating in oil bath, centrifuging, washing, adding water and heating. USE - Preparation of nickel hydroxide-graphene composite nano-material used for adsorbing divalent nickel ions (claimed) or copper ions. DETAILED DESCRIPTION - The preparation method of nickel hydroxide-graphene composite nano-material involves (A) oxidizing graphite to obtain oxidized graphene, (B) taking oxidized graphene obtained in step (a) to prepare suspension, adjusting pH to 9.5-10.5, heating with stirring at 85-95 degrees C, adding reducing agent to carry out water bath reduction to obtain multi-layer graphene oxide original solution, mixing multi-layer graphene oxide solution and divalent nickel ion solution at molar ratio of 83:(9.3-93), adding weak alkaline solution to adjust pH to 9-11, heating in oil bath, centrifuging, washing, adding water and heating at 180 degrees C. An INDEPENDENT CLAIM is included for application of nickel hydroxide-graphene composite nano-material in adsorption of divalent nickel ions.