▎ 摘　　要

NOVELTY - The preparation method of graphene oxide/nano-titanium dioxide/sodium alginate composite material involves stirring graphene oxide and deionized water to obtain graphene oxide solution, adding nano-titanium dioxide into graphene oxide solution, and stirring to obtain reaction liquid, performing hydrothermal method or microwave method of the reaction liquid to prepare graphene oxide/nano-titanium dioxide mixed reactant, adding sodium alginate into deionized water, and stirring to obtain sodium alginate solution, and adding into graphene oxide/nano titanium dioxide mixed reactant. USE - Preparation method of graphene oxide/nano-titanium dioxide/sodium alginate composite material for removing lead ion in wastewater (claimed). ADVANTAGE - The method enables preparation of graphene oxide/nano-titanium dioxide/sodium alginate composite material with excellent dispersibility, stability, large surface area, strong adsorption performance and adsorption specificity, and high lead ion removing efficiency. DETAILED DESCRIPTION - The preparation method of graphene oxide/nano-titanium dioxide/sodium alginate composite material involves (1) adding graphene oxide into deionized water, stirring at speed of 180-500 rpm for 15-45 minutes to obtain graphene oxide solution with concentration of 0.5-5 mg/ml, adding nano-titanium dioxide into graphene oxide solution, where the mass ratio of nano-titanium dioxide and graphene oxide is (1-5):1, and stirring at speed of 180-500 rpm for 0.5-1 hours to obtain reaction liquid, (2) performing hydrothermal method or microwave method of the reaction liquid obtained in the step (1) to prepare graphene oxide/nano-titanium dioxide mixed reactant, (3) adding sodium alginate into deionized water, stirring at speed of 180-500 rpm for 0.5-2 hours to obtain sodium alginate solution with concentration of 5-15 mg/ml, adding the sodium alginate solution into graphene oxide/nano titanium dioxide mixed reactant prepared in the step (2), placing in a water bath at 40-80 degrees C, stirring at speed of 180-500 rpm for 15 minutes to 1 hour, naturally cooling to room temperature, where the mass ratio of sodium alginate and graphene oxide/nano titanium dioxide mixed reactant is (0.75-3):1, and (4) washing the reactant obtained in the step (3) using deionized water and anhydrous ethanol several times, and drying at 40-80 degrees C for 12-24 hours. An INDEPENDENT CLAIM is included for use of graphene oxide/nano-titanium dioxide/sodium alginate composite material, which involves ultrasonically dispersing adding graphene oxide/nano-titanium dioxide/sodium alginate composite material into wastewater containing lead ion, where the concentration of lead ion in wastewater is 1-400 mg/l, 0.1-50 g graphene oxide/nano-titanium dioxide/sodium alginate composite material per liter of wastewater containing lead ion, adjusting the pH value of the solution to 5-8 using hydrochloric acid and sodium hydroxide, reacting at 15-30 degrees C, magnetically stirring for 3-18 hours, leaving for 30 minutes, and filtering film to complete removal of lead ion in wastewater.