▎ 摘　　要

NOVELTY - Preparing amino thiourea functionalized graphene oxide/chitosan composite adsorbent comprises (i) dispersing chitosan in acetic acid solution to obtain chitosan dispersion liquid, (ii) dispersing the graphene oxide in water to obtain the graphene oxide dispersion liquid, then adding to the chitosan dispersion liquid obtained in step (i), (iii) adding the thiosemicarbazide to the dispersion liquid obtained in the step (ii), and stirring and processing, (iv) adding glutaric dialdehyde in the mixed solution obtained in step (iii), stirring and reacting, (v) adding the mixed solution obtained in the step (iv) into the sodium hydroxide solution, adding while stirring, centrifuging, washing and drying. USE - The adsorbent is useful in waste water treatment containing heavy metal ions, preferably mercurous ion (claimed). ADVANTAGE - The method: is simple; ensures high yield; ensures adsorption selectivity to mercurous ion; ensures easy separation and recovery. The adsorbent can realize adsorption removal of heavy metal ion. DETAILED DESCRIPTION - An INDEPENDENT CLAIM is also included for amino thiourea functionalized graphene oxide/chitosan composite adsorbent.