▎ 摘　　要

NOVELTY - Reduced graphene oxide-zero-valent iron nano-composite material, prepared by (a) preparing 5 pts. wt. graphene oxide powder, 10 pts. wt. tea polyphenols, 2000 pts. wt. deionized water and 69.5 pts. wt. ferrous sulfate; (b) adding 5 pts. wt. graphene oxide powder into 1000 pts. wt. deionized water, and ultrasonically dispersing for 20 minutes to obtain mixed solution I; (c) adding 5 pts. wt. tea polyphenols into the mixed solution I, and obtaining mixed solution II after full reaction; (d) adding 69.5 pts. wt. ferrous sulfate into the mixed solution II and stirring for 1 hour to obtain the mixed solution III; (e) adding 5 pts. wt. tea polyphenols into 1000 pts. wt. deionized water, and stirring to obtain mixed solution IV; (f) adding the mixed solution IV into the mixed solution III and stirring for 24 hours to form the mixed solution V; and (g) washing and drying the mixed solution V in sequence, is claimed. USE - The nanocomposite material is useful in detecting trace mercury ions in water environment (claimed), where the water includes industrial waste water discharged from industries such as electroplating, mining and paper making. ADVANTAGE - The rGO-ZVI nano-composite material has excellent dispersing performance on the reducing graphene oxide framework, and reduces the self-aggregation phenomenon of zero-valent iron. DETAILED DESCRIPTION - An INDEPENDENT CLAIM is also included for a detection device of trace mercury ion in water environment. DESCRIPTION OF DRAWING(S) - The drawing shows a schematic flow chart illustrating the method for preparing rGO-ZVI nano-composite material (Drawing includes non-English language text).