▎ 摘　　要

NOVELTY - Synthesizing graphene oxide-lanthanum oxide-cobalt hydroxide composite material comprises e.g. (i) mixing graphene oxide and deionized water and dissolving ultrasonically to obtain a solution; (ii) adding lanthanum trichloride and cobalt(II) chloride hexahydrate into the solution prepared in step (i) and stirring to react to obtain a mixed solution a; (iii) heating the mixture a, adding the urea solution and stirring the mixture to obtain the mixture b; (iv) cooling the mixed solution b and stirring at room temperature, adding sodium hydroxide solution, stirring to control the pH value of the solution, precipitating, filtering, washing with suction and with deionized water until the precipitate neutral to obtain a neutral precipitate; (v) adding the neutral precipitate prepared in step (iv) into deionized water, reacting in a hydrothermal reactor, cooling the reactor to room temperature and taking out to obtain a product; and (vi) filtering the product, washing, evaporating and drying. USE - The graphene oxide-lanthanum oxide-cobalt hydroxide composite material is useful in wastewater treatment as catalyst (claimed). ADVANTAGE - The method: can catalytically degrade and remove methylene blue in the solution at different initial methylene blue (MB) concentrations, different pH, different temperatures, and different amounts of catalysts; and produces the product with good catalytic effect, short time and low dosage which can be recycled. DETAILED DESCRIPTION - Synthesizing graphene oxide-lanthanum oxide-cobalt hydroxide composite material comprises (i) mixing graphene oxide and deionized water and dissolving ultrasonically to obtain a solution; (ii) adding lanthanum trichloride and cobalt(II) chloride hexahydrate into the solution prepared in step (i) and stirring to react to obtain a mixed solution a; (iii) heating the mixture a, adding the urea solution and stirring the mixture to obtain the mixture b; (iv) cooling the mixed solution b and stirring at room temperature, adding sodium hydroxide solution, stirring to control the pH value of the solution, precipitating, filtering, washing with suction and with deionized water until the precipitate neutral to obtain a neutral precipitate; (v) adding the neutral precipitate prepared in step (iv) into deionized water, reacting in a hydrothermal reactor, cooling the reactor to room temperature and taking out to obtain a product; and (vi) filtering the product obtained in step (v), washing with ethanol and deionized water to neutral, evaporating the water on the surface to dryness, drying under vacuum, transferring the dried product into a hydrothermal reactor, adding with ethanol for reaction, washing the product with deionized water, drying the product under vacuum, and drying in an oven. An INDEPENDENT CLAIM is also included for graphene oxide-lanthanum oxide-cobalt hydroxide composite material, synthesized as mentioned above. DESCRIPTION OF DRAWING(S) - The drawing shows the schematic representation of flow chart of synthesizing graphene oxide-lanthanum oxide-cobalt hydroxide composite material. (Drawing includes non-English language text).