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Zinc oxide composite photocatalyst, preparation method and application thereof

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, and achieve large specific surface area, no secondary pollution, and photocatalytic The effect of high reactivity

Active Publication Date: 2018-09-04
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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  • Zinc oxide composite photocatalyst, preparation method and application thereof
  • Zinc oxide composite photocatalyst, preparation method and application thereof

Examples

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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 , magnetically stir the mixed solution (300-500r / min) ...

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Abstract

Belonging to the chemical field, chemical engineering field and environmental engineering field, the invention relates to a zinc oxide composite photocatalyst, a preparation method and application thereof. The method includes: firstly, preparing a three-dimensional micron flower-like zinc-based precursor by liquid-phase coprecipitation technique, conducting high temperature calcinations to prepareporous zinc oxide microflowers, then taking silver nitrate as the precursor, further reducing silver ions adsorbed on the porous zinc oxide surface into nano-silver particles by ultraviolet irradiation technique so as to prepare an Ag / ZnO composite material, thus obtaining the zinc oxide composite photocatalyst. The invention also provides the zinc oxide composite photocatalyst prepared by the preparation method and application of the zinc oxide composite photocatalyst to formaldehyde degradation in water under ultraviolet irradiation condition. The Ag / ZnO composite material prepared by the method provided by the invention has the advantages of large specific surface area, high photocatalytic reaction active site and the like, and can be used for photocatalytic degradation of formaldehydeliquid 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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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
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