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Firework-shaped nano-ZnO photocatalyst prepared based on one-step calcination method and method thereof

A photocatalyst and fireworks-like technology, which is applied in the field of fireworks-like nano-ZnO photocatalysts, can solve the problems of harsh process conditions, low product purity, and high cost, and achieve the effects of high product purity, stable preparation system, and low cost

Inactive Publication Date: 2015-10-28
SHAANXI UNIV OF SCI & TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

These commonly used process conditions for preparing micron-sized rod-shaped ZnO are relatively harsh and complicated, and the obtained product has low purity and poor performance; or the required raw material is high-purity metal zinc, and the cost is high

Method used

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  • Firework-shaped nano-ZnO photocatalyst prepared based on one-step calcination method and method thereof
  • Firework-shaped nano-ZnO photocatalyst prepared based on one-step calcination method and method thereof
  • Firework-shaped nano-ZnO photocatalyst prepared based on one-step calcination method and method thereof

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0028] Example 1: Zinc acetate dihydrate (the ratio of the volume of zinc acetate dihydrate to the total volume of the crucible is 1:60) is placed in a ceramic crucible, the crucible lid is covered, and then placed in a box-type resistance furnace cavity, by After heating at room temperature to 300°C, calcining for 1 hour, and gradually lowering to room temperature; that is, fireworks-like nano-ZnO is formed on the crucible wall.

[0029] figure 1 a. figure 1 B is respectively the scanning electron micrograph (SEM) of 5000 times and 10000 times of fireworks-shaped nano-ZnO prepared in this example; As can be seen from the figure: the ZnO microrods prepared in this example have good dispersion, and its diameter is 20-40nm, length 2-5μm.

Embodiment 2

[0030] Example 2: Zinc acetate dihydrate (the ratio of the volume of zinc acetate dihydrate to the total volume of the crucible is 2:60) is placed in a ceramic crucible, the crucible lid is covered, and then placed in a box-type resistance furnace cavity, by After heating at room temperature to 350°C, calcining for 1.5h, and gradually lowering to room temperature; that is, fireworks-like nano-ZnO is formed on the crucible wall.

[0031] figure 2 a. figure 2 B is respectively the scanning electron micrograph (SEM) of the firework shape nano-ZnO 5000 times and 10000 times that this example prepares; As can be seen from the figure: the ZnO microrod that this example makes is good in dispersibility, and its diameter is 40-80nm, and length is 4-7μm.

Embodiment 3

[0032] Example 3: Zinc acetate dihydrate (the ratio of the volume of zinc acetate dihydrate to the total volume of the crucible is 3:60) is placed in a ceramic crucible, the crucible lid is covered, and then placed in a box-type resistance furnace cavity, by After heating at room temperature to 400°C, calcining for 2 hours, and gradually lowering to room temperature; that is, fireworks-like nano-ZnO is formed on the crucible wall.

[0033] image 3 a. image 3 B is respectively the scanning electron micrograph (SEM) of the firework shape nano-ZnO 5000 times and 10000 times that this example prepares; As can be seen from the figure: the ZnO microrod that this example makes is good in dispersion, and its diameter is 10-30nm, and length is 3-8μm.

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Abstract

The invention relates to a firework-shaped nano-ZnO photocatalyst prepared based on a one-step calcination method and a method thereof. An existing micron-grade bar-shaped ZnO preparation technology is rigor and complex in condition, the purity of products is low, the performance is poor, or high-purity metal zinc is adopted as raw materials, and the cost is high. According to the firework-shaped nano-ZnO photocatalyst based on the one-step calcination method and the method thereof, zinc acetate dehydrate is placed in a ceramic crucible at the volume ratio of (1-3):60, then the ceramic crucible is covered with a crucible cover and is placed in a furnace chamber of a box type resistance furnace, heating calcination is conducted, the temperature is gradually reduced to the indoor temperature, and then firework-shaped nano-ZnO self-assembled by nano-bars with the length of 1-8 micrometer and the diameter of 10-80 nm is formed on the crucible wall. According to the firework-shaped nano-ZnO photocatalyst prepared based on the one-step calcination method and the method thereof, the zinc acetate dehydrate serves as a zinc source, the one-step calcination method is adopted to obtain the firework-shaped nano-ZnO photocatalyst which is low in cost, uniform in size and good in photocatalytic activity under the action of visible light, the purity of products is high, the preparation system is stable, the method is suitable for large-area preparation, and technical supports are provided for industrially producing the high-purity nano-ZnO photocatalyst.

Description

technical field [0001] The invention relates to a photocatalyst, in particular to a firework-shaped nano ZnO photocatalyst prepared based on a one-step calcination method and a method thereof. Background technique [0002] According to statistics, my country produces about one million tons of organic dyes every year to meet the needs of industries such as textiles, food, and cosmetics. In the process of production and processing, a considerable proportion of dyes will enter rivers along with the discharge of industrial wastewater. and ocean. In order to meet the needs of sustainable development, how to decolorize and purify these polluted wastewater becomes very important. In recent years, the development of using semiconductor materials as photocatalysts to treat organic pollutants in water is very rapid. As a wide bandgap (3.2 eV) semiconductor oxide, ZnO has attracted extensive attention due to its high photocatalytic efficiency and environmental friendliness. However,...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): B01J23/06B01J35/02C01G9/02B82Y30/00B82Y40/00B01J35/00
Inventor 马建中赵燕茹刘俊莉
Owner SHAANXI UNIV OF SCI & TECH
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