A method for preparing nano TiO2*/SiO2* photocatalytic material
A photocatalytic material and nanotechnology, applied in chemical instruments and methods, physical/chemical process catalysts, catalyst activation/preparation, etc., can solve the problems of photocatalyst dispersion and low catalytic degradation rate, and achieve convenient operation and overcome technical problems. Difficulties, the effect of improving catalytic activity
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Embodiment 1
[0030] Weigh 18g pure TiO 2 Calcined at 500°C for 2 hours, dispersed in 180ml of deionized water to prepare a mixed solution, added 1.8ml of 30g / L sodium hexametaphosphate, ultrasonically dispersed for 15min, the ultrasonic electric power was 300W, and the working frequency was 40KHz; Transfer to a three-necked flask, adjust the pH to 10 in a water bath at 90°C, and slowly add 22.7ml of 0.5mol / L NaSiO 3 Solution, while keeping the constant pH value, reacted for 3 hours; aged at room temperature for 120min; centrifuged the aged turbid solution at 4000r / min for 15min; Add an appropriate amount of deionized water to the centrifuge tube once, stir with a glass rod, and centrifuge at a speed of 4000r / min for 15min; then add an appropriate amount of 95% ethanol, stir with a glass rod, and centrifuge at a speed of 4000r / min for 15min to finally obtain a precipitate material; the precipitate was dried at 110°C for 36 hours and ground to obtain TiO 2 / SiO 2 photocatalytic material. ...
Embodiment 2
[0032] Weigh 18g pure TiO 2 Calcined at 400°C for 5 hours, dispersed in 90ml of deionized water to prepare a mixed solution, added 0.3ml of 30g / L sodium hexametaphosphate, ultrasonically dispersed for 5min, the ultrasonic electric power was 300W, and the working frequency was 40KHz; Transfer to a three-necked flask, adjust the pH at 8 in a water bath at 90°C, and slowly add 9.03ml of 0.5mol / L NaSiO 3 solution while keeping the pH value constant, reacted for 1 hour, and aged at room temperature for 120 minutes; centrifuged the aged liquid for 8 minutes at 3000 r / min; Add an appropriate amount of deionized water to the centrifuge tube once, stir with a glass rod, and centrifuge at a speed of 3000r / min for 8min; then add an appropriate amount of 95% ethanol, stir with a glass rod, and centrifuge at a speed of 3000r / min for 8min to finally obtain a precipitate material; the precipitate was dried at 100°C for 24 hours and ground to obtain TiO 2 / SiO 2 photocatalytic material.
Embodiment 3
[0034] Weigh 18g pure TiO 2 Calcined at 450°C for 3 hours, dispersed in 120ml of deionized water to prepare a mixed solution, added 0.6ml of 30g / L sodium hexametaphosphate, ultrasonically dispersed for 10min, the ultrasonic electric power was 300W, and the working frequency was 40KHz; Transfer to a three-necked flask, adjust the pH at 9 in a water bath at 90°C, and slowly add 14ml of 0.6mol / L NaSiO 3solution while keeping the pH value constant, reacted for 1.5 hours, and aged at room temperature for 120 minutes; centrifuged the aged liquid at 3000r / min for 10 minutes; Add an appropriate amount of deionized water to the centrifuge tube once, stir with a glass rod, and centrifuge at a speed of 3000r / min for 10min; then add an appropriate amount of 95% ethanol, stir with a glass rod, and centrifuge at a speed of 3000r / min for 10min to obtain a precipitate material; the precipitate was dried at 110°C for 24 hours and ground to obtain TiO 2 / SiO 2 photocatalytic material.
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