▎ 摘　　要

NOVELTY - Preparation of porous nano composite material involves reacting Schiff base with 2,5-bis(methyl decyl)terephthalaldehyde and chitosan to obtain 2,5-bis(methyl decyl)terephthalaldehyde-chitosan, and covalently grafting 2,5-di(methylindenyl)terephthalaldehyde-chitosan on the surface of graphene oxide. USE - Preparation of porous nano composite material for removing heavy metal ions in wastewater or drinking water(claimed). ADVANTAGE - The preparation is simple, economical and environmentally-friendly. The prepared porous nano composite material has stable structure, and high removal efficiency of heavy metal ions in water due to increased adsorption capacity of heavy metal ions. DETAILED DESCRIPTION - An INDEPENDENT CLAIM is included for application of porous nano composite material used for removal of heavy metal ions by directly adding porous nano composite material into wastewater containing heavy metal ions, stirring and adsorbing heavy metal ions.