▎ 摘　　要

NOVELTY - An anatase nano-titanium dioxide preparation involves slowly adding tetrabutyl titanate to absolute ethyl alcohol solution and a mixed liquid containing hydrochloric acid and de-ionized water to obtain hydroxide colloid solution. An ethanolic solution containing graphene is added to the hydroxide colloid solution in a volume ratio of 10-50:1, stirred for 30-60 minutes and allowed to stand for 12-24 hours in argon gas atmosphere. The resulting mixture is dried at 60-80 degrees C, ground, and the temperature is increased to 10 degrees C per minute to 300 degrees C-500 degrees C to obtain anatase nano-titanium dioxide. USE - Method for preparing anatase nano-titanium dioxide that is utilized for preparing a nickel-hydrogen secondary battery (claimed). ADVANTAGE - The method enables preparing the anatase nano-titanium dioxide having better discharge specific capacity and circulation stability in a simple and inexpensive manner. DETAILED DESCRIPTION - An anatase nano-titanium dioxide preparation involves adding natural crystalline flake graphite and potassium permanganate in a mass ratio of 5:1 to 98% sulfuric acid (30-40 ml). The mixture is stirred, reacted for 0.5 hours, and heated in a water bath. The reaction product is transferred to an ice water bath, cooled at 30-40 degrees C and stirred for 30-60 minutes. The cooled mixture is heated at 50-70 degrees C and stirred for 0.5-2 hours. The resulting product is washed with de-ionized water (80-120 mL) and 30% hydrogen peroxide (10-20 mL), and reacted for 10-20 minutes with continuous stirring. The reaction product is centrifugally separated. The resulting filter cake is washed with 2% hydrochloric acid and de-ionized water until there is no sulfate ion in the product, and dried under vacuum at 50-80 degrees C to obtain oxidized graphite. The prepared graphite oxide is dispersed in de-ionized water to prepare a solution having concentration of 0.5-mg/ml, and the prepared solution is subjected to ultrasonic treatment to obtain graphene oxide solution. Dodecyl benzene sulfonic acid and sodium dodecyl benzene sulfonate in a mass ratio of 1: 1-3, water and 85% callose are added to oxidized graphite alkene solution and heated in a water bath at 70-80 degrees C. The reaction product is washed with deionized water until the pH is neutralized to 7. The washed product is added to absolute ethanol to prepare ethanolic solution containing graphene having concentration of 0.5 mg/ml. Tetrabutyl titanate is slowly added to absolute ethyl alcohol solution and a mixed liquid containing 36.5 mass % of hydrochloric acid and de-ionized water to obtain hydroxide colloid solution. The ethanolic solution containing graphene is added to the hydroxide colloid solution in a volume ratio of 10-50:1, stirred for 30-60 minutes and allowed to stand for 12-24 hours in argon gas atmosphere. The resulting mixture is dried at 60-80 degrees C. The dried product is ground, and the temperature is increased to 10 degrees C per minute to 300 degrees C-500 degrees C to obtain anatase nano-titanium dioxide.