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Zinc oxide based composite photocatalytic nano-material and preparation method thereof

A composite photocatalysis and nanomaterial technology, applied in chemical instruments and methods, metal/metal oxide/metal hydroxide catalysts, physical/chemical process catalysts, etc., can solve problems such as unsatisfactory photocatalytic performance

Active Publication Date: 2014-06-04
ZHEJIANG NORMAL UNIVERSITY
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  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

Iron oxide is a common metal oxide semiconductor with a narrow band gap. It is widely used in photocatalysis and catalysts, but its photocatalytic performance is not ideal. Combining with other semiconductor materials can also improve its photocatalytic performance. Effective Ways
However, the novel sea urchin-like ZnO microsphere structure and α-Fe 2 o 3 The impregnation-deposition preparation of the nanoparticle-modified sea urchin structure composite material and its novel structure and the effect of the composite system on the photocatalytic activity have not been reported yet.

Method used

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  • Zinc oxide based composite photocatalytic nano-material and preparation method thereof
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  • Zinc oxide based composite photocatalytic nano-material and preparation method thereof

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preparation example Construction

[0036] The zinc oxide photocatalytic nano material provided by the present invention is a material with visible light catalytic activity. The material has a sea urchin-like solid spherical shape or a sea urchin-like hollow spherical morphology, a particle size of 2–4 μm, and a specific surface area of ​​18.9 m 2 / g–21.8m 2 / g. The preparation method includes the following steps:

[0037] (1) Preparation of precursor solution: Dissolve zinc salt in a solvent and stir to obtain a precursor solution, in which the concentration of metal ions is 0.06mol / L–0.08mol / L;

[0038] (2) Put the precursor solution in the autoclave, seal it, and react at 140-180℃ for 1.5-9h;

[0039] (3) After the reaction, it is cooled to room temperature, the product is repeatedly washed with absolute ethanol, and dried at 60°C for 2-6 hours to obtain the zinc oxide photocatalytic nanomaterial.

[0040] The present invention adopts the following impregnation-precipitation method to prepare zinc oxide-based composi...

Embodiment 1

[0046] 2.0×10 -3 mol zinc acetate was dissolved in 35mL ethylene glycol / water mixed solvent (volume ratio 6:1) to obtain a precursor solution; the precursor solution was placed in a 50mL autoclave, sealed, and reacted at 150°C for 2h; the reaction was completed After cooling to room temperature, the product was repeatedly washed with ethanol, and dried at 60°C for 2 hours to obtain a sea urchin-like solid zinc oxide microsphere structure with visible light catalytic degradation of dye wastewater. The microstructure of the product is as follows figure 1 Shown. The specific surface area is about 18.9m calculated by nitrogen adsorption / desorption curve test 2 / g.

Embodiment 2

[0048] Using the process in Example 1, the reaction time is increased to 9 hours, and sea urchin-like ZnO microspheres can also be obtained, such as figure 2 As shown, at this time, a hollow structure is formed inside the microsphere. The specific surface area is about 21.8m calculated by nitrogen adsorption / desorption curve test 2 / g.

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Abstract

The invention provides a zinc oxide based composite photocatalytic nano-material, which is a material with visible light catalytic activity. The material has a sea-urchin-shaped solid sphere shape or hollow sphere shape. The preparation method comprises the following two steps: (1) putting alcohol / water solution of zinc salt into a high-pressure reaction kettle, reacting at 140-180 DEG C for 1.5-9 hours, washing the product with ethanol, and drying at 60 DEG C for 2-6 hours to obtain a sea-urchin-shaped ZnO microsphere; (2) performing ultrasonic dispersion on the sea-urchin-shaped ZnO in a ferric salt solution by utilizing a dipping-precipitation method, dripping ammonium hydroxide to react for 1-12 hours at 40 DEG C in a stirring condition, wherein the mass ratio of ferric salt to ZnO is 0.05-0.2; collecting solid, calcining at 350 DEG C for 2 hours to obtain an alpha-Fe2O3 nano-particle modified ZnO composite photocatalytic system. The material has strong light absorption and light response in the visible light range, can be used for remarkably improving the activity of visible light catalytic degraded organic dye, and can be applied to light catalytic degradation treatment of wastewater of the dye industry.

Description

Technical field [0001] The invention relates to the field of photocatalytic nanomaterials and environmental protection, in particular to the preparation of α-Fe with visible light catalytic activity by using alcohol thermal method and subsequent immersion-precipitation method. 2 O 3 A simple method for nano-particles modified sea urchin-like zinc oxide microsphere structure to composite photocatalytic nanomaterials. Background technique [0002] At present, environmental protection has attracted more and more attention, and one of the research hotspots is the use of semiconductor materials as photocatalysts to treat organic pollutants by photocatalytic oxidation. ZnO is a direct band gap semiconductor material with wurtzite structure. It has the characteristics of high chemical stability, harmless to the human body, low cost, and deep valence band energy level. However, the band gap at room temperature reaches 3.37eV, and the absorption wavelength threshold is mostly in the ultra...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): B01J23/06B01J23/80C02F1/30
Inventor 乔儒殷巧巧朱兰兰吴文杰李苗苗童国秀
Owner ZHEJIANG NORMAL UNIVERSITY
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