▎ 摘　　要

NOVELTY - Composite hydrogel having network structure comprises polyethylene-based hydrogel including polyacrylamide hydrogel and/or polyacrylic acid hydrogel and is crosslinked by graphene oxide and crosslinking agent containing at least two crosslinking groups, each consisting of carbon to carbon group and amine group. USE - The composite hydrogel having network structure is used in wastewater treatment (claimed). ADVANTAGE - The composite hydrogel has mechanical strength of 28-50 kPa; swelling ratio of 1-11 g/g; adsorption ratio to heavy metal ions of 0.8-7 g/g, in which heavy metal ions comprise copper ion (Cu2+), zinc ion (Zn2+), or mercury ion (Hg2+); and has adsorption to basic fuchsin of 5-10 mg/g. DETAILED DESCRIPTION - Composite hydrogel having network structure comprises polyethylene-based hydrogel including polyacrylamide hydrogel and/or polyacrylic acid hydrogel and is crosslinked by graphene oxide and crosslinking agent containing at least two crosslinking groups, each consisting of carbon to carbon group (C=C) and amine group (-NH2). An INDEPENDENT CLAIM is included for preparation of composite hydrogel by mixing raw materials containing vinyl compound, graphene oxide and crosslinking agent; pre-reacting; adding initiator; and polymerizing to obtain composite hydrogel.