▎ 摘　　要

NOVELTY - Method for preparing graphene-based nano magnetic biological adsorbent, involves preparing functionalized graphene by oxidizing graphite powder and activating the surface, and preparing cyclodextrin chitosan and preparing magnetic cyclodextrin chitosan/graphene composite material by adding the funtionalized graphene into N-hydroxyl succinimide, adding magnetic cyclodextrin chitosan and cross-linking agent for bonding and crosslinking reaction, using external magnetic field, washing, and drying to obtain the magnetic cyclodextrin chitosan/graphene composite material. USE - The method is useful for preparing graphene-based nano magnetic biological adsorbent which is used for separating and enriching heavy metals and organic pollutants in waste water. ADVANTAGE - The method improves the mechanical property of the adsorbent, greatly enlarges the specific surface area of the adsorbent, increases the binding and enveloping sites between ions or molecules and the magnetic cyclodextrin chitosan, and prepared nano magnetic adsorption material having controllable surface structure, good stability, strong mechanical property, high adsorptive capacity, quickness in adsorption equilibrium, easiness in separation, high reutilization rate, and excellent application potentialities. DETAILED DESCRIPTION - Method for preparing a graphene-based nano magnetic biological adsorbent, involves (a) preparing functionalized graphene by oxidizing graphite powder and activating the surface for preparing the functionalized graphene in the presence of mixed acid and strong oxidizer, where the surface has multiple functional groups, such as hydroxyl and carboxyl, (b) preparing cyclodextrin chitosan by adding the funtionalized graphene into N-hydroxyl succinimide, then adding magnetic cyclodextrin chitosan and a cross-linking agent to perform bonding and crosslinking reaction, using external magnetic field to separate, washing, and drying to obtain the magnetic cyclodextrin chitosan/graphene composite material, and (c) preparing a magnetic cyclodextrin chitosan/graphene composite material by adding the functionalized graphene into N-hydroxyl succinimide, then adding magnetic cyclodextrin chitosan and a cross-linking agent to perform bonding and cross linking reaction, under the condition of the external magnetic field, separating, and washing to obtain the magnetic cyclodextrin chitosan/graphene composite material.