▎ 摘　　要

NOVELTY - Preparing graphene oxide coated titanium oxide microsphere photocatalyst comprises (i) adding concentrated sulfuric acid in dry beaker, cooling, adding natural crystalline flake graphite, sodium nitrate and potassium permanganate, stirring, reacting, adding deionized water, stirring, adding mixed solution, centrifuging and washing to obtain mud material; (ii) drying, dispersing in deionized water, and centrifuging; (iii) preparing white powder; (iv) mixing the clear liquid and white powder, stirring, centrifuging and washing; and (v) placing in muffle furnace, and controlling heating rate. USE - The method is useful for preparing graphene oxide coated titanium oxide microsphere photocatalyst (claimed). ADVANTAGE - The method: can stably combine graphene oxide and titanium oxide together; has short experimental period, rapid synthesizing speed, and high efficiency; is convenient to operate, and low in energy consumption; and can be applied to the industrial production. DETAILED DESCRIPTION - Preparing graphene oxide coated titanium oxide microsphere photocatalyst comprises (i) adding 98% concentrated sulfuric acid in a dry beaker, cooling to 0 degrees C, adding natural crystalline flake graphite, sodium nitrate and potassium permanganate, stirring, controlling the reaction temperature at 10-30 degrees C, stirring for 3 hours, placing the beaker filled with mixed solution in a 35 degrees C constant temperature water bath, reacting at 35 degrees C, and continuously stirring for 30 minutes, finally controlling the reaction temperature to 0-100 degrees C, drop wise adding deionized water, continuously stirring for 30 minutes, and adding a mixed solution of 30% hydrogen peroxide and deionized water, centrifuging and washing with water to obtain yellow brown mud material; (ii) drying the mud material, then dispersing in deionized water, carrying out ultrasonic treatment for 1-3 hours, and centrifuging for two times to obtain red-brown clear liquid; (iii) adding 0.5 mmol/l potassium chloride into absolute ethyl alcohol, carrying out magnetic stirring for 30 minutes, then slowly dripping into tetrabutyl titanate, stirring and reacting for 30 minutes, aging for 4 hours, centrifuging and separating by absolute ethyl alcohol and deionized water in turn, and drying to obtain white powder; (iv) mixing the clear liquid obtained in the step (ii) and white powder obtained in the step (iii) at room temperature, carrying out magnetic stirring for 24 hours, centrifuging and washing for 4 times, and obtaining white powder; and (v) placing the white powder in a muffle furnace under the vacuum condition, controlling heating rate to 1 degrees C/minute, and keeping the temperature for 2 hours.