▎ 摘　　要

NOVELTY - Preparing composite chromium ion-imprinted hydrogel involves using polycarbonate microsphere to obtain silicon dioxide hollow microsphere, preparing respectively thiolated graphene and alkyne-functionalized polyacrylamide, using thiolated graphene and alkynyl functionalized polyacrylamide to obtain graphene grafted polyacrylamide, preparing chitosan-grafted polyacrylamide, dissolving the chitosan grafted polyacrylamide in distilled water, adding potassium dichromate, mixing uniformly, adding the obtained silicon dioxide hollow microsphere and graphene grafted polyacrylamide, dispersing uniformly, reacting at 50-60℃, subjecting product to a cross-linking reaction in a mixed aqueous solution of glutaraldehyde and thiourea at 60-70℃, and washing to remove template chromium ion to obtain the composite chromium ion-imprinted hydrogel. USE - Method for preparing composite chromium ion-imprinted hydrogel. ADVANTAGE - The prepared composite chromium ion-imprinted hydrogel greatly improves the adsorption performance of the adsorbent, and gives the ability to separate the chromium ion with high selectivity.