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Preparation method of titanium dioxide transparent aqueous sol doped with metal ions

A metal ion, titanium dioxide technology, applied in the direction of titanium dioxide, chemical instruments and methods, titanium oxide/hydroxide, etc., can solve the problem of limiting the utilization of sunlight, and achieve the improvement of photocatalytic efficiency, avoid pollution, and good photocatalytic effect. Effect

Pending Publication Date: 2011-12-28
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

However, as a wide bandgap semiconductor material, titanium dioxide has some defects in practical applications.
Titanium dioxide can only be excited by ultraviolet light with a wavelength of less than 385nm, and this part of ultraviolet light is less than 5% in the solar spectrum, which limits the use of sunlight
At present, there is no report on the preparation of non-acidic metal ion doped titanium dioxide aqueous sol

Method used

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  • Preparation method of titanium dioxide transparent aqueous sol doped with metal ions
  • Preparation method of titanium dioxide transparent aqueous sol doped with metal ions
  • Preparation method of titanium dioxide transparent aqueous sol doped with metal ions

Examples

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Effect test

Embodiment 1

[0023] 0.01mol manganese sulfate (MnSO 4 ) and 0.1mol titanium tetrachloride were dissolved in 500mL water to form a manganese-titanium mixed solution, and ammonia solution was added dropwise to the mixed solution until the pH was 10 to obtain a manganese-titanium composite titanic acid precipitate, which was washed with water and filtered to remove sulfuric acid root and chloride ions; the washed and filtered precipitate is dispersed in 50 mL of 30% hydrogen peroxide solution (the molar ratio of hydrogen peroxide to titanium ions in the composite titanic acid precipitate is 5), heated to reflux at 90°C 4 hours, obtain the titania sol of manganese ion doping (in kind see figure 1 ), the pH value is between 7.5 and 8.0.

Embodiment 2

[0025] 0.0001mol copper acetate (Cu(CH 3 COO) 2 ) and 0.1mol titanium tetrachloride were dissolved in 500mL water to form a copper-titanium mixed solution, and ammonia solution was added dropwise to the mixed solution until the pH was 10 to obtain a copper-titanium composite titanic acid precipitate, which was washed with water and filtered to remove the acetic acid therein root and chloride ions; the washed and filtered precipitate is dispersed in 60 mL of 5% hydrogen peroxide solution (the molar ratio of hydrogen peroxide to titanium ions in the composite titanic acid precipitate is 1), heated to reflux at 90°C 1 hour, obtain the titania sol of copper ion doping (in kind see figure 1 ), the pH value is between 6.0 and 6.5.

Embodiment 3

[0027] 0.005mol cobalt nitrate (Co(NO 3 ) 2 ) and 0.1mol titanyl sulfate were dissolved in 500 mL water to form a cobalt-titanium mixed solution, and an aqueous sodium hydroxide solution was added dropwise to the mixed solution until the pH was 8 to obtain a cobalt-titanium composite titanic acid precipitate, which was washed with water and filtered to remove the Sulphate and nitrate ions; the washed and filtered precipitate is dispersed in 200mL of mass concentration of 15% hydrogen peroxide solution (the molar ratio of hydrogen peroxide to titanium ions in the composite titanic acid precipitate is 10), 100°C Heated and refluxed for 2 hours to obtain the titanium dioxide sol doped with cobalt ions (see figure 1 ), the pH value is between 6.5 and 6.5.

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Abstract

The invention relates to a class of titanium dioxide photocatalysts, in particular to a low-temperature preparation method of visible light-responsive titanium dioxide transparent aqueous sol doped with metal ions. The titanium inorganic salt and the metal inorganic salt as a dopant are dissolved in water together to form a mixed solution; wherein, the molar ratio of the metal ion in the metal inorganic salt as a dopant to the titanium ion in the titanium inorganic salt is 0.001~ 0.2; then dropwise add inorganic lye until the pH of the mixed solution is about 7-11 to obtain a composite titanic acid precipitate, wash the composite titanic acid precipitate with water and filter, then disperse with hydrogen peroxide aqueous solution, at a temperature of 50-100 Heating at ℃ for 1-24 hours to obtain a transparent aqueous sol of titanium dioxide doped with metal ions. The low-temperature preparation method of the metal ion-doped titanium dioxide transparent water-based sol avoids the problem of environmental pollution, and the obtained sol is transparent, neutral and water-based, and has good photocatalytic effect under visible light.

Description

technical field [0001] The invention relates to a class of titanium dioxide photocatalysts, in particular to a low-temperature preparation method of a series of visible light-responsive titanium dioxide transparent aqueous sols doped with metal ions. Background technique [0002] Titanium dioxide is a metal oxide semiconductor material with photocatalytic activity under ultraviolet light irradiation. Due to its simple photocatalytic process technology, low cost, safety, non-toxicity, non-irritation, no secondary pollution, chemical stability and thermal stability It has a wide range of applications in solar energy conversion, environmental purification, chemical sensors, etc. However, as a wide bandgap semiconductor material, titanium dioxide has some defects in practical applications. Titanium dioxide can only be excited by ultraviolet light with a wavelength of less than 385nm, and this part of ultraviolet light is less than 5% in the solar spectrum, which limits the util...

Claims

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Application Information

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IPC IPC(8): C01G23/08B01J21/06B01J23/34B01J23/72B01J23/755B01J23/745B01J23/14
Inventor 只金芳齐宾余愿
Owner TECHNICAL INST OF PHYSICS & CHEMISTRY - CHINESE ACAD OF SCI
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