▎ 摘　　要

NOVELTY - Preparing graphene/sodium alginate beads modified with nano zero valent iron involves adding 95% sulfuric acid solution and sodium nitrate in graphite powder, then placed in ice water bath with stirring to obtain dark green solution. The dark green solution is added with potassium permanganate, then kept at 0 degrees C under stirring for 1.5-2.5 hours. The mixture is heated up to 35 degrees C with continuous stirring for 30 minutes to obtain mixed solution. The mixed solution is drop wise added with deionized water, then temperature is raised to 90-98 degrees C. USE - Method for preparing graphene/sodium alginate beads modified with nano zero valent iron for restoring polluted water body (claimed). ADVANTAGE - Method enables to prepare graphene/sodium alginate beads modified with nano zero valent iron, increases beads porosity, increases contaminant removing efficiency of beads, enhances the mechanical strength of the beads, reduces the breakage rate of beads in the decontamination process, reduces secondary pollutants, improves beads activity and processing capacity of beads. DETAILED DESCRIPTION - Preparing graphene/sodium alginate beads modified with nano zero valent iron involves adding 95% sulfuric acid solution and sodium nitrate in graphite powder, then placed in ice water bath with stirring to obtain dark green solution. The dark green solution is added with potassium permanganate, then kept at 0 degrees C under stirring for 1.5-2.5 hours. The mixture is heated up to 35 degrees C with continuous stirring for 30 minutes to obtain mixed solution. The mixed solution is drop wise added with deionized water, then temperature is raised to 90-98 degrees C under continuous stirring for 30 minutes. The heating is stopped, then 30% of hydrogen peroxide solution is added under continuing stirring for 1 hours. The graphene oxide is separated, then washed, then dried at 55-65 degrees C by vacuum drying to obtain graphene oxide. The graphene oxide is formulated to concentration of 0.25- 1.0g/L graphene oxide dispersion liquid. The ultrasonic treatment of graphene oxide dispersion liquid is carried out for 30 minutes, then centrifuged. The precipitate is removed to obtain graphene oxide purified liquid. The sodium alginate is dissolved in graphene oxide purified liquid by heating with stirring to form uniformly mixed gel. The gel is cooled to room temperature to obtain graphene oxide modified sodium alginate gel. The 0.01- 0.10Molar of ferrous oxide solution is heated at constant temperature with stirring for complete dissolution, then added drop wise with reducing solution, for reacting for 30-60 minutes, then the precipitate is separated, then washed with deionized water to obtain nano zero valent iron particle. The nano zero valent iron particle is added in graphene modified sodium alginate gel, then stirred uniformly, then allowed to stand to obtain mixed gel. The mixed gel is added with cross-linking agent with shaking for 12-24 hours, the washed to obtain graphene/sodium alginate beads modified with nano zero valent iron. The graphene/sodium alginate beads modified with nano zero valent iron is soaked in 100 mL deionized water, then added with reducing agent, then placed in water bath for 1-3 hours, then soaked in deionized water for 1-3 hours for removing impurity ion to obtain graphene/sodium alginate beads modified with nano zero valent iron.