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Nanometer powder of titanium oxide coated by zinc oxide and preparation method thereof

A nano-powder and titanium oxide technology, applied in the field of functional ceramic materials, can solve the problems of low photocatalytic efficiency and low temperature resistance, and achieve the effect of high photocatalytic efficiency and high temperature resistance

Inactive Publication Date: 2011-01-19
SHIJIAZHUANG TIEDAO UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0005] The technical problem to be solved by the present invention is to overcome the shortcomings of low photocatalytic efficiency and low temperature resistance of titanium oxide in the prior art, and provide a zinc oxide-coated titanium oxide by combining nitrogen doping and coating zinc oxide Nanopowder and preparation method thereof

Method used

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  • Nanometer powder of titanium oxide coated by zinc oxide and preparation method thereof
  • Nanometer powder of titanium oxide coated by zinc oxide and preparation method thereof
  • Nanometer powder of titanium oxide coated by zinc oxide and preparation method thereof

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0020] ① Prepare tetrabutyl titanate and urea with a molar ratio of 5:1, the volume of the tetrabutyl titanate is V1; prepare a mixed solution of glacial acetic acid and absolute ethanol with a molar ratio of 1:19, the The volume of glacial acetic acid is V2; the volume is distilled water of V3; wherein, V1: V2: V3 is 5: 1: 1.67; prepare saturated zinc nitrate solution, wherein the mol ratio of Zn2+ and tetrabutyl titanate is 0.1: 1;

[0021] 2. urea is dissolved in step 1. with dehydrated alcohol, under electromagnetic stirring, add step 1. the mixed solution of glacial acetic acid and dehydrated alcohol, be 98% concentrated nitric acid solution with mass concentration and adjust pH value to be 2, Stir for 0.5 to 1 hour; then slowly drop in V1mL of tetrabutyl titanate described in step ① under rapid stirring, and stir for 5 hours; then slowly drop in V3mL of distilled water under rapid stirring to obtain solution A;

[0022] ③ Stir the solution A obtained in step ② at room te...

Embodiment 2 Embodiment 3

[0028] The difference from Example 1 is that the holding temperatures in step ⑤ are 900°C and 950°C respectively.

[0029] The nano-powders prepared in Examples 1 to 3 were analyzed by XRD respectively, and the XRD patterns can be found in figure 1 . It can be seen from the figure that the nanopowder prepared by the present invention still has a mixed crystal structure of anatase phase and rutile phase after being calcined at 950° C., and the crystal particle size is about 75 nm. However, the titanium oxide powder prepared by the general method will rapidly transform from anatase-type titanium oxide to rutile-type titanium oxide at 550-700°C. It can be seen that the zinc oxide-coated titanium oxide nano-powder prepared by the present invention increases the crystal transformation temperature by 200° C., and significantly improves the high temperature resistance.

[0030] In addition, obvious zinc titanate (ZnTiO 3 ) peak, indicating the presence of a transition layer. Beca...

Embodiment 4

[0032] ① Prepare tetrabutyl titanate and urea with a molar ratio of 2.5:1, the volume of the tetrabutyl titanate is V1; prepare a mixed solution of glacial acetic acid and absolute ethanol with a molar ratio of 1:10, the The volume of glacial acetic acid is V2; the volume is distilled water of V3; wherein, V1: V2: V3 is 2.5: 1: 2; prepare saturated zinc sulfate solution, wherein the mol ratio of Zn2+ and tetrabutyl titanate is 0.15: 1;

[0033] ②Dissolve the urea with absolute ethanol, add a mixed solution of glacial acetic acid and absolute ethanol under stirring, adjust the pH value to 2 with a concentrated nitric acid solution with a mass concentration of 98%, and stir for 0.5 to 1 h; then stir rapidly slowly drop into the tetrabutyl titanate, and stir for 1 h; then slowly drop into the distilled water under rapid stirring to obtain solution A;

[0034] ③ Stir the solution A obtained in step ② at room temperature for 5 hours to form a transparent gel, and seal it for 7 days...

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Abstract

The invention discloses a nanometer powder of titanium oxide coated by zinc oxide and a preparation method thereof, belonging to the technical field of the functional material. The nanometer powder contains a zinc oxide coating layer and titanium oxide nanoparticles and also contains a Ti-O-Zn compound phase transition layer, wherein the titanium oxide nanoparticles contain nitrogen with the molar percentage of 0.1-50%; the molar ratio of zinc oxide in the coating layer to titanium oxide in nanoparticles is 0.05-0.3:1. The preparation method comprises the following steps: using tetrabutyl titanate as titanium source and urea as nitrogen source to prepare titanium oxide nanoparticles containing nitrogen through the sol-gel method, then using soluble zinc salt as raw material and ammonia-ammonium mixed solution as precipitating agent to prepare zinc oxide through the co-precipitation method, and coating the titanium oxide nanoparticles containing nitrogen. The nanometer powder of the invention overcomes the defects of common titanium oxide nanometer powder, namely poor photocatalytic capability and heat resistance, and is a kind of compound nanometer powder which has good excellent performance and reasonable cost / performance ratio and is advanced and practical.

Description

technical field [0001] The invention relates to a functional ceramic material, in particular to a zinc oxide-coated titanium oxide nano-powder with high photocatalytic efficiency and high temperature resistance and a preparation method thereof. Background technique [0002] Nano-titanium oxide semiconductor photocatalysis technology has attracted widespread attention as a new type of environmental pollutant reduction technology. Due to the high antibacterial efficiency, long-lasting antibacterial effect, non-toxic health and environmental friendliness of nano-titanium photocatalytic antibacterial ceramics, it has become a research hotspot in various countries in recent years. [0003] Studies have shown that titanium oxide has three isomers: anatase type, rutile type and brookite type, of which only anatase type titanium oxide has obvious photocatalytic and bactericidal properties. However, the general anatase titanium oxide has a wide band gap (3.2eV), can only absorb the ...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C04B35/628C04B35/46
Inventor 秦国强张光磊耿文甜李彦芳王瑞敏
Owner SHIJIAZHUANG TIEDAO UNIV
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