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A kind of zinc oxide composite photocatalyst and its preparation method and application

A technology of zinc oxide and composite light, which is applied in the chemical field, can solve the problems of small specific surface area, ZnO cannot provide active reaction sites, and affect the photocatalytic performance of ZnO crystals, so as to achieve large specific surface area, improve photocatalytic efficiency, and achieve unique The effect of secondary pollution

Active Publication Date: 2021-08-31
FUJIAN AGRI & FORESTRY UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

There are many methods to prepare ZnO with various morphologies, such as nanorods, nanoflowers, nanowires, etc., but the specific surface area of ​​ZnO with these morphologies is often small, which affects the photocatalytic performance of ZnO crystals, and the prepared large Some ZnO cannot provide many active reaction sites

Method used

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  • A kind of zinc oxide composite photocatalyst and its preparation method and application
  • A kind of zinc oxide composite photocatalyst and its preparation method and application

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Embodiment 1

[0020] A zinc oxide-based composite catalytic preparation method for photocatalytically degrading formaldehyde, comprising the following steps:

[0021] 1. Preparation of 3D porous zinc oxide: Weigh 2.7g of zinc nitrate hexahydrate and dissolve it in 20mL of deionized water, add dropwise (1 drop / s) an aqueous solution containing 1.27g of hexamethylenetetramine and 0.3g of oxalic acid dihydrate 30mL, and magnetically stirred to make it fully dissolved, the mixed solution was condensed and refluxed in an oil bath at 80°C for 4 hours to obtain a white precipitate, which was washed with deionized water several times, and then placed in a vacuum oven (50°C ) is dried for 24 hours to form zinc oxide. The zinc oxide is placed in a muffle furnace and calcined at 500° C. for 3 hours in an air atmosphere to obtain a porous ZnO product.

[0022] 2. Preparation of Ag / ZnO composite material: Weigh 0.0559g of silver nitrate, dissolve it in 100mL of deionized water, then weigh 0.1342g of the...

Embodiment 2

[0025] 1. Preparation of 3D porous zinc oxide: Weigh 2.7g of zinc nitrate hexahydrate and dissolve it in 20mL of deionized water, add dropwise (1 drop / s) an aqueous solution containing 2.54g of hexamethylenetetramine and 0.3g of oxalic acid dihydrate 30mL, and magnetically stirred to make it fully dissolved, the mixed solution was condensed and refluxed in an oil bath at 80°C for 4 hours to obtain a white precipitate, which was washed with deionized water several times, and then placed in a vacuum oven (50°C ) is dried for 24 hours to form zinc oxide. The zinc oxide is placed in a muffle furnace and calcined at 400° C. for 4 hours in an air atmosphere to obtain a porous ZnO product.

[0026] 2. Preparation of Ag / ZnO composite material: Weigh 0.1399g of silver nitrate, dissolve it in 100mL of deionized water, then weigh 0.1342g of the 3D porous zinc oxide sample prepared in step 1, and add it to the silver nitrate solution , stir the mixed solution magnetically (300-500r / min) f...

Embodiment 3

[0029]1. Preparation of 3D porous zinc oxide: Weigh 2.7g of zinc nitrate hexahydrate and dissolve it in 20mL of deionized water, add dropwise (1 drop / s) an aqueous solution containing 1.27g of hexamethylenetetramine and 0.572g of oxalic acid dihydrate 30mL, and magnetically stirred to make it fully dissolved, the mixed solution was condensed and refluxed in an oil bath at 80°C for 4 hours to obtain a white precipitate, which was washed with deionized water several times, and then placed in a vacuum oven (50°C ) is dried for 24 hours to form zinc oxide. The zinc oxide is placed in a muffle furnace and calcined at 400° C. for 4 hours in an air atmosphere to obtain a porous ZnO product.

[0030] 2. Preparation of Ag / ZnO composite material: Weigh 0.0131g of silver nitrate, dissolve it in 100mL of deionized water, then weigh 0.1342g of the 3D porous zinc oxide sample prepared in step 1, and add it to the silver nitrate solution , stir the mixed solution magnetically (300-500r / min) ...

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Abstract

The invention belongs to the fields of chemistry, chemical engineering and environmental engineering, and relates to a zinc oxide composite photocatalyst and its preparation method and application. First, the three-dimensional micron flower-shaped zinc-based precursor was prepared by liquid phase co-precipitation method, and the porous zinc oxide micron flower was prepared by high-temperature calcination, and then silver nitrate was used as the precursor, and the adsorbed on the surface of porous zinc oxide was further irradiated by ultraviolet light. Silver ions are reduced to nano-silver particles, thereby preparing Ag / ZnO composite materials and obtaining zinc oxide composite photocatalysts. The present invention also provides the zinc oxide composite photocatalyst prepared by the above preparation method, and the application of the zinc oxide composite photocatalyst for degrading formaldehyde in water under the condition of ultraviolet light irradiation. The Ag / ZnO composite material prepared by the invention has the advantages of large specific surface area, high photocatalytic reaction active sites, etc., and can be used for photocatalytic degradation of formaldehyde liquid under ultraviolet light.

Description

technical field [0001] The invention belongs to the fields of chemistry, chemical engineering and environmental engineering, and relates to a zinc oxide composite photocatalyst and its preparation method and application. Background technique [0002] In recent years, formaldehyde has been widely used as a chemical raw material in the fields of plastics, printing, pesticides, insecticides, building materials, etc. The above industries will discharge a large amount of waste water containing formaldehyde. Formalin solution sewage can also cause water pollution. These sewage are discharged into rivers and lakes, etc., directly causing serious harm to aquaculture and agriculture, not only to human health, but also to people's living environment and ecological environment. pose a great threat. The traditional methods for removing formaldehyde gas include ventilation, physical adsorption, biological purification, membrane separation technology, etc., but these methods only transfe...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): B01J23/66B01J35/00B01J35/02C02F1/32C02F1/72C02F101/34
CPCC02F1/32C02F1/725B01J23/66C02F2101/34B01J35/39B01J35/40
Inventor 黄六莲刘胜楠肖禾马晓娟陈礼辉
Owner FUJIAN AGRI & FORESTRY UNIV