▎ 摘　　要

NOVELTY - Preparing hydroxylated graphene-magnesium titanate/molybdate composite comprises e.g. preparing hydroxylated graphene oxide and magnesium titanate/molybdate composite photocatalyst, then mixing, and then carrying out ultrasonic dispersion for 3-5 hours to obtain final product. USE - The method is useful for preparing hydroxylated graphene-magnesium titanate/molybdate composite (claimed). ADVANTAGE - The method has simple preparation processes, and excellent efficiency. DETAILED DESCRIPTION - Preparing hydroxylated graphene-magnesium titanate/molybdate composite comprises (i) mixing 2-4 g graphene oxide, 1-2 g phosphorus pentoxide, 1-2 g sodium persulfate and 10-15 ml concentrated sulfuric acid evenly, heating at 85-95 degrees C for 8-12 hours under water bath, then cooling for 12 hours, washing with ultra-pure water to remove residual acid, carrying out ultrasonic dispersion at 50-80 degrees C for 5-8 hours, then vacuum drying at 65-85 degrees C, adding dried crystals into 120-200 ml concentrated sulfuric acid, then adding 2-3.5 g potassium nitrate, oscillating for 5-10 hours, then adding 0.5-1 l water, reacting at 85-95 degrees C for 2-10 hours with oscillating, washing with hydrochloric acid (mass percentage of 5-20%) and ultra-pure water, and then carrying out ultrasonic dispersion at 50-80 degrees C for 5-8 hours, and adding 5-10 g/l graphene oxide to obtain graphene oxide, (ii) dissolving 2-5 g bromoethane in 10-50 ml ammonia in a volume concentration of 1:1, then adding graphene obtained in step (i), and stirring at room temperature for 20-30 minutes, (iii) adding 1-2 g sodium hydroxide into solution obtained in step (ii) and heating at 80-100 degrees C for 8-10 hours, washing with water to obtain hydroxy group having a concentration of 5-10 g/l graphene oxide, (iv) adding 50-120 ml silver nitrate having a concentration of 0.5-0.8 mol/l into 50-100 ml 0.1-0.2 mol/l sodium hydroxide solution at a concentration of 50-80 degrees C for 1-2 hours, separating supernatant to obtain silver oxide particles, (v) adding 50-100 ml aqueous ammonia solution having a concentration of 15-25% (mass percent) into silver oxide particles of step (iv) and stirring until the silver oxide particles are completely dissolving to obtain silver ammonia complex solution, (vi) adding obtained silver ammonia complex solution of step (v) with 0.5-0.8 mol titanium nitrate and 0.5-0.6 mol magnesium nitrate, stirring for 1-2 hours, oscillating for 3-5 hours, then adding 0.05-0.06 mol sodium molybdate, stirring for 2-3 hours, and then oscillating for 3-5 hours, washing with ultra-pure water, then drying at 100-150 degrees C, and then calcining at 500-600?OC for 8-10 hours, and cooling to obtain magnesium titanate/molybdate composite photocatalyst, and (vii) mixing hydroxylated graphene oxide obtained in step (iii), magnesium titanate/molybdate composite photocatalyst obtained in step (vi) at a mass ratio of 100:5, carrying out ultrasonic dispersion for 3-5 hours to obtain final product.