Low temperature crystallized nano titanium dioxide powder and sol synthesizing method
A technology of nano-titanium dioxide and sol, which is applied in the direction of titanium dioxide, titanium oxide/hydroxide, etc., can solve the problems of high equipment requirements and high production costs, achieve high photocatalytic activity, reduce equipment requirements, and effectively degrade organic matter.
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Embodiment 1
[0050] Sulfuric acid with a concentration of 80% is heated to dissolve ilmenite (mass ratio ilmenite: sulfuric acid = 1:2), and the obtained solid-phase sediment is leached with water to obtain titanium liquid, and the titanium liquid is filtered to remove insoluble slag, and frozen for recrystallization The ferrous sulfate is removed by filtration to obtain a titanium-containing precursor solution; the pH value of the precursor solution is adjusted to 7 with ammonia water to obtain orthotitanic acid precipitation. Take 80g of orthotitanic acid precipitate and add 20ml of 30% hydrogen peroxide solution to dissolve, and use 30% HNO 3 Adjust pH=2, dilute the obtained solution to 200ml, and reflux at 100°C for 6 hours to obtain a yellow-orange transparent titanium dioxide nanosol.
Embodiment 2
[0052] Orthotitanic acid precipitate was obtained in the same manner as in Example 1. Take 80g of orthotitanic acid precipitate and add 20ml of 30% hydrogen peroxide solution to dissolve, adjust the pH to 0.5 with 30% nitric acid, dilute the resulting solution to 200ml with pure water, reflux at 100°C for 6 hours to obtain a milky white precipitate, and obtain nano titanium dioxide after vacuum drying Powder, XRD spectrogram measurement results confirm that it is anatase titanium dioxide crystal, see attached figure 1 .
Embodiment 3
[0054] Sulfuric acid with a concentration of 80% is heated to dissolve aluminum titanate, and the obtained solid-phase deposit is leached with water to obtain titanium liquid, the titanium liquid is filtered to remove insoluble slag, and frozen and recrystallized to filter and remove aluminum sulfate to obtain a titanium-containing precursor solution; Precipitation of orthotitanic acid is obtained by heating the precursor solution. Take 80g of orthotitanic acid precipitate and add 20ml of 30% hydrogen peroxide solution to dissolve, use 30% HCl to adjust pH=2, dilute the resulting solution to 200ml, and reflux at 100°C for 6 hours to obtain a yellow-orange transparent titanium dioxide nanosol.
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