▎ 摘　　要

NOVELTY - Preparation of three-dimensional graphene-modified zirconium hydroxide composite adsorbent involves dissolving sodium nitrate in concentrated sulfuric acid, adding graphite powder, stirring, obtaining a suspension, adding potassium permanganate and pure water, stirring, adding pure water and hydrogen peroxide, stirring, obtaining graphene oxide, dispersing in water, adding sodium ascorbate, heating, obtaining three-dimensional graphene gel, immersing the gel in a mixed solution obtained by mixing zirconium oxychloride solution and urea solution, heating, cooling, and freeze-drying. USE - Preparation of three-dimensional graphene-modified zirconium hydroxide composite adsorbent used in removal of fluoride ion from rural drinking water. ADVANTAGE - The method enables simple and economical preparation of three-dimensional graphene-modified zirconium hydroxide composite adsorbent having excellent fluoride ion absorption efficiency and fluoride ion removal efficiency, using widely available raw materials. The adsorbent enables treatment of water sample having fluoride ion concentration of 25-100 mg/L, with fluoride ion removal efficiency of more than 85%, at room temperature. DETAILED DESCRIPTION - Preparation of three-dimensional graphene-modified zirconium hydroxide composite adsorbent involves dissolving sodium nitrate in concentrated sulfuric acid, adding graphite powder, stirring, obtaining a suspension, adding potassium permanganate and pure water, stirring in warm water bath, adding pure water and hydrogen peroxide, stirring, sequentially washing with hydrochloric acid and pure water, freeze-drying, obtaining graphene oxide, dispersing obtained graphene oxide in water, obtaining graphene oxide solution, adding sodium ascorbate, stirring, heating in hot water bath, obtaining three-dimensional graphene gel, immersing the graphene gel in a mixed solution obtained by mixing zirconium oxychloride solution and urea solution, heating, cooling, subjecting to dialysis in pure water, and freeze-drying.