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Synthetic method for preparing rutile type nano titanic oxide sol or powder at low temperature

A nano-titanium dioxide, rutile technology, applied in the direction of titanium dioxide, titanium oxide/hydroxide, etc.

Inactive Publication Date: 2009-06-17
TECHNICAL INST OF PHYSICS & CHEMISTRY - CHINESE ACAD OF SCI
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

At present, the method for preparing rutile titanium dioxide sol at low temperature has not been reported yet.

Method used

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  • Synthetic method for preparing rutile type nano titanic oxide sol or powder at low temperature
  • Synthetic method for preparing rutile type nano titanic oxide sol or powder at low temperature
  • Synthetic method for preparing rutile type nano titanic oxide sol or powder at low temperature

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Experimental program
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Effect test

Embodiment 1

[0036] 1.5g SnCl 2 2H 2 O dissolved in 400mL 0.2mol / L TiCl 4 In the solution, the pH of the solution was adjusted to 8 with ammonia water, and a yellow composite orthotitanic acid precipitate was obtained. Disperse the precipitate in 80 mL of hydrogen peroxide solution with a mass concentration of 30%, add water to adjust the volume to 150 mL, adjust the pH value to 3 with nitric acid, and reflux at 100 ° C for 12 hours to obtain orange-yellow rutile nano-titanium dioxide sol, see Figure 4 . XRD characterizes as rutile nano titanium dioxide crystals, see figure 1 .

Embodiment 2

[0038] 0.9g SnCl 4 Dissolve in 400mL 0.2mol / L TiOSO 4 In the solution, dilute the solution with water to 50 times of the original volume to obtain composite orthotitanic acid precipitation. Disperse the precipitate in 120 mL of 30% hydrogen peroxide solution, add water to adjust the volume to 200 mL, adjust the pH to 6 with ammonia solution, and reflux at 50°C for 24 hours to obtain a yellow nano-titanium dioxide sol.

Embodiment 3

[0040] Sulfuric acid with a mass concentration of 80% is heated to dissolve ilmenite, 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 ferrous sulfate to obtain a titanium-containing precursor solution; 1.5gSnCl 2 2H 2 O was dissolved in 200 mL of precursor solution containing 0.4 mol / L titanium, heated and stirred at 100 °C to obtain composite orthotitanic acid precipitation. Disperse the precipitate in 40 mL of 30% hydrogen peroxide solution, add water to adjust the volume to 100 mL, adjust the pH to 2 with sulfuric acid, and reflux at 100° C. for 2 hours to obtain an orange-yellow nano-titanium dioxide sol.

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Abstract

The invention belongs to a synthesis method for preparing nano-titania sol and powder, and in particular relates to a synthesis method for preparing rutile nano-titania sol or powder at a low temperature. The synthesis method comprises: dissolving a mineralizer into an aqueous solution containing titanium salt, obtaining the mineralizer-doped aqueous solution containing the titanium salt, using inorganic alkali to adjust the pH value of the solution to be between 5 and 11 or using water to dilute the mineralizer-doped aqueous solution containing the titanium salt or heating the mineralizer-doped aqueous solution containing the titanium salt, and obtaining composite titanate deposit; using superoxol to disperse the composite titanate deposit into solution state, and adjusting the pH value of the composite titanate solution; adjusting the pH value to be more than 1 in order to obtain the sol; adjusting the pH value to be less than or equal to 1 in order to obtain the powder; heating the solution; obtaining the yellow orange transparent or semitransparent nano titania sol when the pH value is more than 1; and obtaining white deposit when the pH value is less than or equal to 1, and obtaining the nano titania powder after centrifugation or filtration. The synthesis method greatly reduces the cost and simplifies the technology.

Description

technical field [0001] The invention belongs to a synthesis method for preparing rutile nano-titanium dioxide sol and powder, in particular to a synthesis method for preparing rutile-type nano-titanium dioxide sol or powder at low temperature. Background technique [0002] Titanium dioxide is a very stable amphoteric oxide, which hardly reacts with other elements and compounds at room temperature, and is hardly soluble in water, fatty acids, other organic substances and dilute inorganic acids (except HF). Due to its good performance, it has a wide range of applications in the chemical industry. [0003] Titanium dioxide has three crystal forms: rutile, anatase and brookite, the former two being the most common. The brookite form is an unstable crystal form, and it transforms into the rutile form above 650°C. The anatase type is stable at room temperature, but it also transforms into the rutile type at a high temperature of about 950°C, and this transformation is gradual an...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C01G23/053
Inventor 只金芳齐宾吴良专
Owner TECHNICAL INST OF PHYSICS & CHEMISTRY - CHINESE ACAD OF SCI
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