▎ 摘　　要

NOVELTY - A graphene oxide is dispersed in water and ultrasonic-dispersed, to obtain suspension of graphene oxide. Nano zero-valent iron and hexadecyltrimethylammonium bromide are added to graphene oxide suspension, stirred and reacted, to obtain reaction solution. The reaction solution is heated at 80-85 degrees C, and a reducing agent is added and reacted, to obtain black flocculent precipitate. The reducing agent is sodium borohydride and/or potassium borohydride. The black flocculent precipitate is suction filtered, washed and dried, to obtain graphene composite adsorbent. USE - Preparation of graphene composite adsorbent used for removing nitrochlorobenzene in aqueous solution (all claimed). ADVANTAGE - The graphene composite adsorbent is efficiently and economically prepared with high yield by simple method, without environmental pollution. DETAILED DESCRIPTION - A graphene oxide is dispersed in water and ultrasonic-dispersed, to obtain suspension of graphene oxide. Nano zero-valent iron and hexadecyltrimethylammonium bromide are added to graphene oxide suspension, stirred and reacted, to obtain reaction solution. The mass ratio of nano zero-valent iron, graphene oxide and hexadecyltrimethylammonium bromide is 1:2:7-9. The reaction solution is heated at 80-85 degrees C, and a reducing agent is added and reacted, to obtain black flocculent precipitate. The reducing agent is sodium borohydride and/or potassium borohydride. The content of reducing agent is 9-11 mass times the content of graphene oxide. The black flocculent precipitate is suction filtered, washed and dried, to obtain graphene composite adsorbent. An INDEPENDENT CLAIM is included for usage of graphene composite adsorbent, which involves adding 1-2 g graphene composite adsorbent to liter of aqueous solution, controlling water temperature to 20-50 degrees C, absorbing and oscillating reacting, filtering with membrane and removing nitrochlorobenzene in aqueous solution.