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Gold-doped nano-zinc oxide composite material and its preparation method and its application in photocatalytic degradation of tetracycline

A nano-zinc oxide and composite material technology is applied to the preparation of nano-zinc oxide composite materials and the application field of photocatalytic degradation of tetracycline, which can solve the problems of not too uniform distribution, uncontrollable size of gold nanoparticles, etc., so as to improve the photocatalytic effect. Activity, promotion of catalytic performance, effect of simple operation

Active Publication Date: 2021-01-01
SUZHOU UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

In previous literature reports, the commonly used carrier is mainly TiO 2 , CeO 2 etc., but the size of gold nanoparticles loaded on the oxide is uncontrollable, and the distribution is not too uniform, so it is necessary to find a better carrier to dope gold nanoparticles

Method used

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  • Gold-doped nano-zinc oxide composite material and its preparation method and its application in photocatalytic degradation of tetracycline
  • Gold-doped nano-zinc oxide composite material and its preparation method and its application in photocatalytic degradation of tetracycline
  • Gold-doped nano-zinc oxide composite material and its preparation method and its application in photocatalytic degradation of tetracycline

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0044] Example 1 The preparation of the zinc carrier, the specific steps are as follows:

[0045] Dissolve 3.3g of dimethylimidazole (Hmin) in 70ml of methanol, add to 1.5g of Zn (NO 3 ) 2 ·6H 2 O in 70ml of methanol solution, mixed thoroughly, and stirred at room temperature for 24h; the reaction solution was filtered and put into a vacuum drying oven, vacuumed, and dried at 95°C for 12h to obtain the zinc carrier, which is called Z8.

[0046] attached figure 2 It is the TEM image of the zinc carrier. It can be seen from the figure that the zinc carrier has a good crystal structure, showing regular hexagonal crystal grains, and the size is about 200 nm.

Embodiment 2

[0047] Example 2 Loading Au nanoparticles on the surface of zinc carrier

[0048] Disperse the prepared 4.4ml 0.06g / ml zinc carrier methanol solution into 0.8ml chloroauric acid solution, stir at room temperature for 3~5h, and then filter with suction to obtain a light yellow solid that is gold-doped zinc carrier The composite material is named Z8@Au in this paper.

[0049] attached image 3 It is the TEM image of Z8@Au. It can be seen from the figure that Au nanoparticles of about 20nm are relatively evenly distributed on the surface of the zinc carrier @Au, and the zinc carrier still presents a good grain morphology with a size of about 200nm.

Embodiment 3

[0050] Example 3 The preparation of ZnO@Au, the specific steps are as follows:

[0051] Disperse the Z8@Au obtained above in a porcelain boat, put it into a tube furnace, and 2 Calcination was carried out under the Ar atmosphere to obtain a gold-doped nano-zinc oxide composite material, called ZnO@Au; the heating rate was 5°C / min, the calcination time was 8h, and the calcination temperature was 400°C.

[0052] attached Figure 4 It is a transmission electron microscope (TEM) image of ZnO@Au. It can be seen from the figure that gold nanoparticles are successfully loaded on the surface of ZnO, and the distribution is relatively uniform.

[0053] The present invention selects the zeolite imidazolate framework material to prepare the loaded catalyst, and this preparation method has the characteristics of simplicity and high efficiency; moreover, the surface of the zeolite imidazolate framework material itself has more active sites, which can be better connected with gold nanopart...

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Abstract

The invention discloses a preparation method of a gold-doped nano-zinc oxide composite material and its application in photocatalytic degradation of tetracycline; the zeolite imidazolate skeleton structure material is first synthesized, and then gold nanoparticles are doped on its surface, and the resulting solid is Reduction is carried out at high temperature to obtain gold-doped nano-zinc oxide composite materials. Since the active sites provided on the surface of the zeolite imidazolate framework material can match the gold particles to a higher degree, the size of the gold particles in the resulting catalyst is evenly distributed at ~10nm. In the present invention, 50 mg of solid catalyst is used to degrade 100 ml of 0.010 mg / ml tetracycline solution, and the photocatalytic degradation rate can reach 85.5%. The solid catalyst is first poured into the tetracycline solution and stirred. After dark adsorption for 30 minutes, the adsorption equilibrium is basically reached, and then When placed under a simulated sunlight source for photocatalytic degradation, the solution concentration can be reduced to 14.5% of the concentration at the end of the dark reaction after 120 minutes, indicating that its photodegradation efficiency is efficient. It can be recycled and reused multiple times, proving its repeatability.

Description

technical field [0001] The invention relates to the technical field of nanocomposite materials, in particular to a preparation method of a nano-zinc oxide composite material doped with gold nanoparticles and its application in photocatalytic degradation of tetracycline. Background technique [0002] As antibiotics are widely used as animal medicines and feed additives in recent years, environmental pollution has been caused. Antibiotics and their metabolites have been detected in surface water, groundwater, and drinking water over the past few years. The introduction of antibiotic residues into the environment through various sources can lead to serious environmental problems, including ecological damage and damage to human health. Antibiotics present in water and soil can cause some allergies and toxicity. The removal or degradation of pharmaceutical contaminants has become an important research topic. [0003] Tetracycline (TC) is poorly absorbed in the digestive tract ...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): B01J23/52C02F1/30C02F101/38
CPCC02F1/30B01J23/52C02F2101/38B01J35/39
Inventor 路建美贺竞辉
Owner SUZHOU UNIV