▎ 摘　　要

NOVELTY - Preparing graphene oxide-hydrotalcite-type composite film comprises (i) stirring the reaction between the graphene oxide dispersion and sodium polystyrene sulfonate solution, concentrating and drying to obtain modified graphene oxide; (ii) uniformly mixing modified graphene oxide, magnesium isopropoxide, aluminum isopropoxide, polyallylamine, fatty acid, an alcohol solvent, stirring the reaction with heating and adjusting the pH to 7.4-7.6, allowing to stand and cooling, adding carbon dioxide gas, allowing to stand for aging, and depositing the film by suction filtration and freeze-drying in a vacuum to obtain freeze-dried film; (iii) lyophilizing the film under inert gas protection, slowly heating, calcining and cooling to obtain calcined film; and (iv) immersing the calcined film in the urea solution, adding urease with a mass of urea solution of 1-3% into the urea solution, thermostatically ultrasonically reacting, suction filtering, washing and drying. USE - The method is useful for preparing graphene oxide-hydrotalcite-type composite film. ADVANTAGE - The film has excellent catalytic performance. DETAILED DESCRIPTION - Preparing graphene oxide-hydrotalcite-type composite film comprises (i) stirring the reaction between the graphene oxide dispersion and sodium polystyrene sulfonate solution at a mass ratio of 1:1-1:3, concentrating and drying to obtain modified graphene oxide; (ii) uniformly mixing 10-15 pts. wt. modified graphene oxide, 20-30 pts. wt. magnesium isopropoxide, 20-30 pts. wt. aluminum isopropoxide, 4-10 pts. wt. polyallylamine, 40-50 pts. wt. fatty acid, 100-150 pts. wt. an alcohol solvent, stirring the reaction with heating and adjusting the pH to 7.4-7.6, allowing to stand and cooling, adding carbon dioxide gas, allowing to stand for aging, and depositing the film by suction filtration and freeze-drying in a vacuum to obtain freeze-dried film; (iii) lyophilizing the film under inert gas protection, slowly heating, calcining and cooling to obtain calcined film; and (iv) immersing the calcined film in the urea solution, adding urease with a mass of urea solution of 1-3% into the urea solution, thermostatically ultrasonically reacting, suction filtering, washing and drying.