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Nano-scale sea urchin-like TiO2/ZnO photocatalyst and preparation method thereof

A nano-scale, photocatalyst technology, applied in metal/metal oxide/metal hydroxide catalysts, physical/chemical process catalysts, chemical instruments and methods, etc., can solve problems such as unfavorable photocatalytic performance and reduce migration. The effect of distance, reduction of compounding, and improvement of separation efficiency

Active Publication Date: 2017-06-30
ZHEJIANG UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

[0004] At present, related technologies can realize TiO 2 / ZnO composite photocatalyst, but the obtained powder is in micron size, which is not conducive to the full play of photocatalytic performance
Nano-sized TiO has not yet been adopted 2 Nanoscale Sea Urchin-like TiO Growth from Powder as Induced Nucleation Body 2 Report on ZnO photocatalyst and its corresponding preparation method

Method used

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  • Nano-scale sea urchin-like TiO2/ZnO photocatalyst and preparation method thereof
  • Nano-scale sea urchin-like TiO2/ZnO photocatalyst and preparation method thereof
  • Nano-scale sea urchin-like TiO2/ZnO photocatalyst and preparation method thereof

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0023] 1) Add 68.5mg of zinc acetate to 32mL of methanol, stir at 60°C for 40min, then add 16.5mL of methanol solution containing 27.5mg of potassium hydroxide, stir at 60°C for 2h, take it out and cool to obtain ZnO sol.

[0024] 2) 25 mg of commercial anatase TiO with a diameter of 5–10 nm 2 The powder was dispersed in ZnO sol, stirred for 2h, and the TiO 2 The surface is coated with a ZnO seed layer, and then the powder is separated by washing.

[0025] 3) Transfer the powder obtained in step 2) to 30 mL of an aqueous solution containing 178 mg of zinc nitrate and 84 mg of hexamethylenetetramine, and stir at 80 °C for 4 h to obtain nano-sized sea urchin-like TiO 2 / ZnO powder.

[0026] figure 1 The scanning electron microscope morphology of the obtained powder is shown, and sea urchin-like TiO with uniform size can be seen 2 / ZnO powder. The size of the composite powder is about 300-600 nm, and the diameter of the ZnO nanorod is about 20-40 nm, and the length is about ...

Embodiment 2

[0028] 1) Same as step (1) of Example 1.

[0029] 2) Same as step (2) of Example 1.

[0030] 3) Transfer the powder obtained in step 2) to 30 mL of an aqueous solution containing 178 mg of zinc nitrate and 84 mg of hexamethylenetetramine, and stir at 80 °C for 2 h to obtain nano-sized sea urchin-like TiO 2 / ZnO powder ( image 3 ).

Embodiment 3

[0032] 1) Same as step (1) of Example 1.

[0033] 2) Same as step (2) of Example 1.

[0034] 3) Transfer the powder obtained in step 2) to 30 mL of an aqueous solution containing 178 mg of zinc nitrate and 84 mg of hexamethylenetetramine, and stir at 80 °C for 8 h to obtain nano-sized sea urchin-like TiO 2 / ZnO powder ( Figure 4 ).

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Abstract

The invention discloses a nano-scale sea urchin-like TiO2 / ZnO photocatalyst. ZnO nanorods are distributed on the outer layers of nanospheres formed by agglomerating TiO2 nanoparticles, wherein TiO2 adopts an anatase phase structure and ZnO adopts a hexagonal wurtzite structure. The preparation method comprises the following steps: mixing a prepared methanol solution of zinc acetate and a prepared methanol solution of potassium hydroxide to obtain ZnO sol; dispersing TiO2 nanopowder into the ZnO sol, coating the surface of the TiO2 with a ZnO seed crystal layer, washing and separating out the powder; then adding the powder into an aqueous solution containing zinc nitrate and hexamethylenetetramine, and performing induced deposition to obtain the ZnO nanorods. The nano-scale sea urchin-like TiO2 / ZnO photocatalyst greatly increases the specific surface area of a material, greatly improves the carrier separating efficiency, and has the photocatalytic performance superior to that of commercial Degussa P25 nanopowder.

Description

technical field [0001] The invention relates to a nanoscale sea urchin-like TiO 2 The invention relates to a ZnO photocatalyst and a preparation method thereof, which are suitable for photocatalytic degradation of pollutants, photoelectric catalytic hydrogen production, dye-sensitized solar cells, etc., and belong to the field of environmental protection energy. Background technique [0002] Semiconductor materials have a wide range of applications in the field of photocatalysis and energy. Among them, TiO 2 And ZnO has received extensive attention because of its low price, simple preparation, good biocompatibility, non-toxic and harmless. However, both materials have certain disadvantages, such as a large band gap, which can only respond to the violet light band; a relatively fast recombination rate of photogenerated electron-hole pairs, and low photon quantum efficiency. [0003] Optimizing the nano-morphology of the material itself and compounding it with other semicon...

Claims

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Application Information

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IPC IPC(8): B01J23/06
CPCB01J23/06B01J35/40B01J35/39
Inventor 项晓波于洋吴进明
Owner ZHEJIANG UNIV
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