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A kind of grass-shaped zinc oxide photocatalytic film coated with nano-silver and its preparation method

A photocatalytic thin film, zinc oxide technology, applied in the field of photocatalysis, can solve the problems of reduced specific surface area of ​​the substrate, weakened photocatalytic performance, aggregation of Ag nanoparticles, etc., to achieve improved photocatalytic performance, excellent photocatalytic activity, and avoid agglomeration Effect

Active Publication Date: 2021-09-28
FUJIAN UNIV OF TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, in the process of Ag modification, if the deposition is uneven, it will easily lead to the aggregation of Ag nanoparticles, resulting in a significant decrease in the specific surface area of ​​the substrate, which in turn leads to a weakened photocatalytic performance.

Method used

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  • A kind of grass-shaped zinc oxide photocatalytic film coated with nano-silver and its preparation method
  • A kind of grass-shaped zinc oxide photocatalytic film coated with nano-silver and its preparation method
  • A kind of grass-shaped zinc oxide photocatalytic film coated with nano-silver and its preparation method

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0026] Prepare the seed layer solution: dissolve 0.11 g of zinc acetate with 25 mL of absolute ethanol in a 58 °C water bath for 0.5 h to obtain solution A; meanwhile, stir and dissolve 0.075 g of sodium hydroxide with 25 mL of absolute ethanol at room temperature for 0.5 h to obtain Solution B. A and B solutions were mixed with each other in a water bath at 70 °C and stirred for 2 h, and then poured into a prepared clean beaker and aged at room temperature for 4 h to obtain a uniform seed layer solution.

[0027] Preparation of the seed layer substrate: the seed layer solution was coated on the glass substrate with a spin coater, and finally the substrate was placed in a crucible and annealed in a resistance oven at 400 °C for 1 h, and the seed layer substrate was obtained after air cooling.

[0028] Preparation of tussock-like zinc oxide substrate: place the seed layer substrate in an aqueous solution containing 0.05 M zinc nitrate hexahydrate, 0.05 M hexamethylenetetramine,...

Embodiment 2-4

[0031] Keep other steps unchanged, change the addition amount of stannous chloride, trifluoroacetic acid and silver nitrate, and adjust the concentrations in the following table to obtain samples Ag / ZnO-2, Ag / ZnO-3 and Ag / ZnO-4 respectively.

[0032] Table 1 Experimental material formula list

[0033]

Embodiment 5

[0035]Prepare 10 mg / L RhB solution, take 50 ml each time as organic waste liquid, immerse the glass sample, and stir the degradation solution throughout. In order to achieve adsorption-desorption equilibrium, samples were taken in a dark room without xenon lamp irradiation for 30 min. Then put it under the xenon lamp under dark room conditions for 2.5 h, take 5 ml samples at intervals for ultraviolet absorption test, and keep the height between the lamp source and the liquid level at 9 cm after each sampling. Thus, the concentration of RhB in each time period can be obtained.

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Abstract

The invention relates to a grass-like zinc oxide photocatalytic film covered with nano-silver. The nano-silver layer is uniformly covered on the surface of grass-like zinc oxide thin rods; layer solution, spin-coated on the surface of the glass substrate, and heat treatment to obtain a seed layer glass substrate, and then placed in a mixed aqueous solution containing zinc nitrate hexahydrate, hexamethylenetetramine, polyethyleneimine and ammonia water The growth of the grass-like zinc oxide film was carried out in the process; finally, the substrate with the grass-like zinc oxide film was immersed in the formaldehyde aqueous solution and silver nitrate aqueous solution containing stannous chloride and trifluoroacetic acid respectively to react to obtain nano-silver layer-coated Grass-like zinc oxide film. The raw materials prepared by the invention are common and easy to obtain, with low cost, simple preparation process and environmental protection. At the same time, excellent photocatalytic activity and recycling performance are obtained, which has potential application value in the field of environmental protection.

Description

technical field [0001] The invention belongs to the technical field of photocatalysis, and in particular relates to a grass-shaped zinc oxide photocatalytic film coated with nano-silver and a preparation method thereof. Background technique [0002] With the rapid development of the economy, the environmental pollution continues to worsen, and the pollution of water resources is particularly serious. The content of residual organic pollutants in the environment is increasing rapidly, threatening the living environment and health of human beings. Through the photocatalytic reaction, the organic matter is decomposed and converted into small molecules, so as to achieve the purpose of purification. [0003] Commonly used photocatalysts are mainly some semiconductor materials, such as TiO 2 , ZnO, CdS, WO 3 Wait. Among them, ZnO, a group II-VI semiconductor material, has a wide range of applications as a photocatalyst in environmental protection and governance due to its low ...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C03C17/36B05D7/14B05D7/24B01J23/66B01J35/06B01J35/10B01J37/02B01J37/16
CPCB01J23/66B01J35/004B01J35/065B01J35/1004B01J37/0201B01J37/16B05D7/14B05D7/24C03C17/3607C03C2217/216C03C2217/256C03C2217/71C03C2218/111C03C2218/31
Inventor 叶晓云王昭鹏王乾廷陈龙蔡曙光李巍陈文哲
Owner FUJIAN UNIV OF TECH
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