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ZnO/Ag2O photocatalysis composite material, as well as preparation method and application thereof

A composite material and photocatalytic technology, which is applied in the field of preparation of metal oxide semiconductor photocatalytic composite materials, can solve the problems of difficult recovery of by-products, long reaction time, high-temperature calcination, etc., and achieve excellent photocatalytic activity, catalytic performance improvement, Reduce the effect of compounding

Inactive Publication Date: 2018-11-09
XIANGTAN UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0005] Currently ZnO / Ag 2 There are not many studies on the O system. The synthesis methods reported in the literature, such as pyrolytic deposition, photochemical synthesis, and hydrothermal precipitation, often have complex operations, long reaction times, high-temperature calcinations, low yields, and by-products. Disadvantages such as not easy to recycle

Method used

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  • ZnO/Ag2O photocatalysis composite material, as well as preparation method and application thereof
  • ZnO/Ag2O photocatalysis composite material, as well as preparation method and application thereof
  • ZnO/Ag2O photocatalysis composite material, as well as preparation method and application thereof

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0022] Example 1: ZnO / Ag with a mass ratio of 10% silver oxide 2 Preparation of O composites

[0023] (1) 20g of sodium nitrate, 7.5g of zinc nitrate hexahydrate, and 0.29g of silver nitrate are mixed in an agate mortar, ground for 15 minutes until evenly mixed, and spread on the bottom of the agate mortar to obtain a premix;

[0024] (2) Add 2.069g of sodium hydroxide to the pre-mixture, grind for 25 minutes to mix evenly, and obtain the crude product;

[0025] (3) The crude product is washed with deionized water, then filtered and dried to obtain ZnO / Ag with 10% silver oxide mass proportion 2 O composite materials.

Embodiment 2

[0026] Example 2: ZnO / Ag with a mass ratio of 30% silver oxide 2 Preparation of O composites

[0027] (1) 20g of sodium nitrate, 7.5g of zinc nitrate hexahydrate, and 0.88g of silver nitrate are mixed in an agate mortar, ground for 25 minutes until evenly mixed, and spread on the bottom of the agate mortar to obtain a premix;

[0028] (2) Add 2.21g of sodium hydroxide to the premixture, grind for 25 minutes to mix evenly, and obtain the crude product;

[0029] (3) The crude product is washed with deionized water, then filtered and dried to obtain ZnO / Ag with a mass ratio of 30% silver oxide 2 O composite materials.

Embodiment 3

[0030] Example 3: ZnO / Ag with a mass ratio of 50% silver oxide 2 Preparation of O composites

[0031] (1) 20g of sodium nitrate, 7.5g of zinc nitrate hexahydrate, and 1.47g of silver nitrate are mixed in an agate mortar, ground for 15 minutes until evenly mixed, and spread on the bottom of the agate mortar to obtain a premix;

[0032] (2) Add 2.35g of sodium hydroxide to the premixture, grind for 25 minutes to mix evenly, and obtain the crude product;

[0033] (3) The crude product is washed with deionized water, then filtered and dried to obtain ZnO / Ag with 50% silver oxide mass proportion 2 O composite materials.

[0034] Its TEM picture is as follows figure 1 As shown, we can see from the figure that the black Ag with a diameter of about 10nm 2 O particles are attached to the ZnO flakes.

[0035] Its EDX diagram is as follows figure 2 Shown, from the figure we can see that the final product ZnO / Ag that embodiment 3 obtains 2 The O composite material is composed of Z...

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Abstract

The invention discloses a ZnO / Ag2O photocatalysis composite material, as well as a preparation method and application thereof. The ZnO / Ag2O photocatalysis composite material, as well as the preparation method and the application thereof have the following technical effects that 1, the ZnO / Ag2O photocatalysis composite material is prepared by one step by adopting a solid phase grinding method, andthe preparation method has the remarkable advantages of simplicity in operation, low energy consumption, high efficiency, high yield, green and environmental protection, and recyclability of substratesodium nitrate, and is suitable for mass production; 2, a p-n node formed between zinc oxide and silver oxide is beneficial to interface electron transfer, the recombination of a photo-induced electron hole pair is reduced, and the catalytic performance is remarkably improved compared with a single semiconductor catalyst; on the other hand, the silver oxide is provided with narrower band gaps compared with the silver oxide, so that silver oxide nanoparticles can be used as an effective photosensitizer under the irradiation of sunlight, so that the visible light catalysis performance of the zinc oxide is improved; 3, the ZnO / Ag2O photocatalysis composite material can be used for degrading organic dye wastewater containing methylene blue, methyl orange and rhodamine B, and can be used for degrading 80 percent or more of target degradation products within 20 minutes at the soonest, so that the degradation rate can be improved by 13 times compared with single zinc oxide, and the excellentphotocatalytic activity is realized.

Description

technical field [0001] The invention belongs to the technical field of photocatalytic materials, in particular to a method for preparing a metal oxide semiconductor photocatalytic composite material. Background technique [0002] In the past few decades, industrially produced organic matter pollution and toxic water pollution have seriously endangered human health. Photocatalytic technology is the most promising technology to solve many current environmental pollution and energy problems due to its high efficiency and wide applicability. With the steady and rapid development of nanoscience and nanotechnology, nanoscale metal oxide semiconductor photocatalysis has attracted much attention due to its wide application in environmental remediation, especially in the removal of organic pollutants. [0003] Among metal oxide semiconductors, ZnO is one of the most important semiconductors in the field of photocatalysis due to its low cost, easy preparation, abundant source and non...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): B01J23/66C02F1/30C02F101/38
CPCC02F1/30B01J23/002B01J23/66C02F2305/10C02F2101/40C02F2101/38B01J35/39
Inventor 张平邓超华丁燕怀杨忠美姜勇蒋运鸿罗和安
Owner XIANGTAN UNIV
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