Method for low-temperature synthesis of titanium dioxide nano powder

[0029] Example 1

[0030] Prepare a deionized aqueous solution of ammonium polyacrylate at a molar concentration of 0.001M; weigh 16.8g of analytically pure sodium hydroxide and 32g of chemically pure titanyl sulfate at a molar ratio of 2.1:1; dissolve the weighed titanyl sulfate to a concentration of 0.001M 150ml ammonium polyacrylate solution, stir evenly, dry in a drying box to obtain a solid mixture containing ammonium polyacrylate and titanium; in the stirring mill, add sodium hydroxide, and then gradually add the solid mixture to Stir the mill, stir and grind for 5 minutes, the speed of the stirring rod is 100 rpm, and the white powder is obtained; the reaction product is washed and precipitated for 10 minutes, and then the precipitate is dried in an oven at a temperature of 325K and a holding time of 3 hours. Obtain nanometer titanium dioxide powder; then conduct transmission electron microscopy observation; the analysis results show that the transmission electron microscopy observation shows that the particle size of the powder is uniform, and electron diffraction rings are formed, which indicates that the titanium dioxide crystal nucleus has been formed, so this method has the characteristics of low synthesis temperature. .

[0031] Example 2

[0032] Prepare a deionized aqueous solution of polyethylene glycol 4000 at a molar concentration of 0.1M; weigh 16.8 g of analytically pure sodium hydroxide and 32 g of chemically pure titanyl sulfate at a molar ratio of 2.1:1; dissolve the weighed titanyl sulfate In 300ml polyethylene glycol 4000 solution with a concentration of 0.1M, stir evenly and dry in a drying box to obtain a solid mixture containing polyethylene glycol 4000 and titanium; in the stirring mill, add sodium hydroxide, and then The solid mixture was gradually added to the stirring mill and stirred and ground for 5 minutes. The speed of the stirring rod was 600 rpm to obtain a white powder; the reaction product was washed and precipitated with water for 360 minutes, and then the precipitate was dried in an oven at a temperature of 385K and drying time 24 hours; put the drying material in a silicon-carbon rod furnace, heat it to 473K at a heating rate of 10K/min and keep it at 473K for 6 hours, then cool down with the furnace to obtain white powder; the white powder obtained does not need to be ground and crushed, and is directly passed through After sieving, nanometer titanium dioxide powder is obtained.

[0033] Example 3

[0034] Prepare Tween 80 deionized water solution at a molar concentration of 0.05M; weigh out 180g of analytically pure sodium hydroxide and 24g of chemically pure titanyl sulfate at a molar ratio of 30:1; dissolve the weighed titanyl sulfate to a concentration of 0.05 In 500ml Tween 80 solution of M, stir evenly, dry in a drying box to obtain a solid mixture containing Tween 80 and titanium; in the stirring mill, add sodium hydroxide, and then gradually add the solid mixture to the stirring In the mill, stir and grind for 30 minutes, and the speed of the stir bar is 600 rpm to obtain a white powder; the reaction product is washed and precipitated for 60 minutes, and then the precipitate is dried in an oven at a temperature of 355K and a drying time of 12 hours; the drying material is set In a silicon-carbon rod furnace, heat to 773K at a heating rate of 5K/min and keep it for 6 hours, then cool in the furnace to obtain white powder; the white powder obtained does not need to be ground and crushed, and directly sieved to obtain nano titanium dioxide powder body. .