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Nickel-doped zinc oxide hierarchical structure photocatalytic nanomaterial and preparation method thereof

A technology of hierarchical structure and nanomaterials, applied in the field of environmental protection and photocatalytic nanomaterials, can solve the problem of unsystematic research on the influence of photocatalytic activity, achieve excellent photocatalytic activity, improve visible light absorption, and improve quantum conversion efficiency. Effect

Inactive Publication Date: 2015-12-02
ZHEJIANG NORMAL UNIVERSITY
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

There are few reports on nickel-doped zinc oxide with complex hierarchical structure, and the research on the influence of morphology, structure, specific surface area, particle size distribution and doping ratio on the photocatalytic activity of doped zinc oxide is not systematic.

Method used

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  • Nickel-doped zinc oxide hierarchical structure photocatalytic nanomaterial and preparation method thereof
  • Nickel-doped zinc oxide hierarchical structure photocatalytic nanomaterial and preparation method thereof
  • Nickel-doped zinc oxide hierarchical structure photocatalytic nanomaterial and preparation method thereof

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0037] Example 1: Ni-doped zinc oxide hierarchical structure photocatalytic nanomaterials with visible light catalytic activity

[0038] The composition of the material is: Zn 1-x Ni x O, where x=0.5–10mol%. The appearance of the nickel-doped zinc oxide varies with Ni 2+ The difference in doping amount is shown as white and light green respectively.

[0039] The material has a particle size of 80–300nm and a specific surface area of ​​3.0–23.0m 2 / g; The shape is hollow spherical, hexagonal prism with sharp corners at both ends, spherical or icosahedral structure.

Embodiment 2

[0040] Example 2: Preparation method of nickel-doped zinc oxide hierarchical structure photocatalytic nanomaterial with visible light catalytic activity

[0041] The material is synthesized using the following reaction formula:

[0042] (1-x)Zn 2+ +xNi 2+ +2OH - →Zn 1-x Ni x (OH) 2 (1)

[0043] Zn 1-x Ni x (OH) 2 →Zn 1-x Ni x O+H 2 O(2)

[0044] The material is obtained by the following method: 1.125×10 -3 mol zinc nitrate, 1.25×10 -4 mol nickel nitrate and 1.25×10 -3 mol sodium hydroxide was dissolved in 20mL methanol and stirred to obtain a precursor solution; the precursor solution was placed in a 50mL high-pressure reactor, sealed, and reacted at 200°C for 8h; after the reaction was completed, it was cooled to room temperature, and the product was washed repeatedly with ethanol, Dry at ℃ for 2 hours to prepare a 10mol% nickel-doped zinc oxide hollow spherical material with visible light catalytic degradation of dye wastewater. The microstructure of the obt...

Embodiment 3

[0047] Using the process in Example 2, when the reaction time is 1.5 h, nickel-doped zinc oxide nanomaterials can also be obtained. The morphology of the obtained product is as image 3 As shown, it is a nanoparticle structure, and there is local self-aggregation into a microsphere structure.

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Abstract

The invention discloses a nickel-doped zinc oxide hierarchical structure photocatalytic nano-material having a visible-light photocatalytic activity and a preparation method thereof. The component of the material is Zn1-xNixO, wherein x=0.5-10 mol%. The method comprises the steps: dissolving a zinc salt, a nickel salt and an alkali in an alcohol solvent or an alcohol / water mixed solvent to obtain a precursor solution with the total concentration of the metal ions of 0.0625-0.25 mol / L and the molar concentration of the alkali of 0.0625-2.5 mol / L; placing the precursor solution in a high-pressure reaction kettle for sealing reaction; after cooling, washing with ethanol, drying in air, and thus obtaining the photocatalytic nano-material having a nano-granular structure, a hollow sphere structure, an icosahedron structure, a hexagonal prism structure or a ball-like structure and other hierarchical structures. The material both has relatively strong photoabsorption and photoresponse in the visible light range of 400-700 nm, significantly improves the activity of visible-light photocatalytic degradation of organic dyes, and can be widely used for photocatalytic degradation treatment of dye industry wastewater.

Description

technical field [0001] The invention relates to the fields of photocatalytic nanomaterials and environmental protection, in particular to a simple method for preparing a nickel-doped zinc oxide hierarchical structure with visible light catalytic activity by using a solvothermal process. Background technique [0002] As a good semiconductor photocatalyst, zinc oxide has a good application prospect in the field of photocatalysis because of its low cost, non-toxicity, high catalytic efficiency, relatively stable structure and performance. However, because its forbidden band width reaches 3.2eV, the absorption wavelength threshold is mostly in the ultraviolet region less than 387nm, and the utilization efficiency of sunlight is low. At the same time, the disadvantages of high carrier recombination rate and low quantum efficiency also limit its practical use, and its catalytic efficiency has not yet reached the level of industrial application. Therefore, it is necessary to devel...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): B01J23/80B82Y40/00B82Y30/00C02F1/30
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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