▎ 摘　　要

NOVELTY - Preparing reduced graphene oxide based (BiOI-RGO) composite photocatalyst sheet involves dissolving 1.0-5.0g/l bismuth (III) nitrate pentahydrate into a mixed solution of ethylene glycol and isopropanol. 1-Hexyl-3-methylimidazolium iodide ionic liquid is added in the mixed solution of glycol and isopropanol in mol ratio of 2:1, and uniformly dispersed. Graphene oxide is added into the ethanol solution and mixed ultrasonically to obtain uniform sheet of grapheme-ethanol solution. Grapheme-ethanol solution is added into ionic liquid dispersion system to obtain mixed solution. USE - Method for preparing reduced graphene oxide based (BiOI-RGO) composite photocatalyst sheet used for photocatalytic degradation of organic pollutants or antibacterial sterilization (claimed). ADVANTAGE - The method is simple, cost-effective and feasible, enables to prepare reduced graphene oxide based (BiOI-RGO) composite photocatalyst sheet that avoids generation of polluting byproducts, photocatalyst has good dispersion degree, improved photo-catalytic activity and good stability, is recycled, and ensures good practical and application prospect. DETAILED DESCRIPTION - Preparing reduced graphene oxide based (BiOI-RGO) composite photocatalyst sheet involves dissolving 1.0-5.0g/l bismuth (III) nitrate pentahydrate into a mixed solution of ethylene glycol and isopropanol. 1-Hexyl-3-methylimidazolium iodide ionic liquid is added in the mixed solution of glycol and isopropanol in mol ratio of 2:1, and uniformly dispersed. Graphene oxide is added into the ethanol solution and mixed ultrasonically to obtain uniform sheet of grapheme-ethanol solution. Grapheme-ethanol solution is added into ionic liquid dispersion system to obtain mixed solution. The mixed solution is reacted in polytetrafluoroethylene reaction kettle at 150-170 degrees C for 7-9 hours, and naturally cooled to room temperature. Obtained product is washed with anhydrous ethanol and de-ionized water, and then dried. An INDEPENDENT CLAIM is included for a method for preparing graphene oxide, which involves: (A) adding 1 g commercial graphene and 1 g sodium nitrate and dissolving in 40 ml sulfuric acid; (B) stirring the mixture under ice bath for 1 hour, adding 5 g potassium permanganate for 48 hours; (C) adding 100 ml 5 wt.% sulfuric acid solution in obtained product at 60 degrees C for 2 hours and adding 10 ml 30 wt.% hydrogen peroxide and 1.0 l deionized water to obtain precipitate; (D) washing the precipitate with 5 mol/l hydrochloric acid, and washing with super-pure water until it is neutral; and (E) vacuum freeze-drying the product at -20 degrees C for 24 hours to obtain grapheme oxide.