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A zinc oxide-based composite photocatalytic nanomaterial and its preparation method

A technology of composite photocatalysis and nanomaterials, applied in the direction of light water/sewage treatment, etc., can solve problems such as unsatisfactory photocatalytic performance

Active Publication Date: 2015-12-30
ZHEJIANG NORMAL UNIVERSITY
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  • Summary
  • 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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  • A zinc oxide-based composite photocatalytic nanomaterial and its preparation method
  • A zinc oxide-based composite photocatalytic nanomaterial and its preparation method
  • A zinc oxide-based composite photocatalytic nanomaterial and its preparation method

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preparation example Construction

[0036] The zinc oxide photocatalytic nanomaterial provided by the present invention is a material with visible light catalytic activity. The material has the shape of a sea urchin-like solid sphere or a sea urchin-like hollow sphere, with a particle size of 2-4 μm and a specific surface area of ​​18.9 m 2 / g–21.8m 2 / g. Its preparation method comprises 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 a high-pressure reactor, seal it, and react at 140-180°C for 1.5-9h;

[0039] (3) Cool to room temperature after the reaction, wash the product repeatedly with absolute ethanol, and dry 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 compo...

Embodiment 1

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

Embodiment 2

[0048] Adopt the technology in embodiment 1, increase the reaction time to 9h, also can obtain sea urchin shape ZnO microsphere, as figure 2 As shown, a hollow structure is formed inside the microsphere at this time. Its specific surface area is calculated to be about 21.8m 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 fields of photocatalytic nanomaterials and environmental protection, in particular to a process for preparing α-Fe with visible light catalytic activity by using alcohol thermal method and subsequent impregnation-precipitation method 2 o 3 A facile method for nanoparticle-modified sea urchin-like ZnO microsphere structure composite photocatalytic nanomaterials. Background technique [0002] At present, environmental protection has attracted more and more attention. 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, which has the characteristics of high chemical stability, harmless to human body, low cost, and deep valence band energy level. However, its band gap reaches 3.37eV at room temperature, and the absorption wavelength threshold is mostly in the ultravi...

Claims

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Application Information

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Patent Type & Authority Patents(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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