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Magnetic nano cerium dioxide ozone catalyst, preparation method and application

A technology of cerium dioxide and magnetic nanometers, which is applied in the direction of metal/metal oxide/metal hydroxide catalysts, physical/chemical process catalysts, chemical instruments and methods, etc., can solve the problems of catalyst difficulty and separation, and achieve easy recycling The effect of reuse

Active Publication Date: 2013-05-15
ZHEJIANG UNIV OF TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, the use of nano-ceria to catalyze the ozonation of organic wastewater has the phenomenon that the catalyst is difficult to separate from the wastewater

Method used

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  • Magnetic nano cerium dioxide ozone catalyst, preparation method and application
  • Magnetic nano cerium dioxide ozone catalyst, preparation method and application
  • Magnetic nano cerium dioxide ozone catalyst, preparation method and application

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0037] (1) Nano Fe 3 o 4 preparation of

[0038] The titration hydrolysis method was used for the preparation of nano-ferric oxide. First, the deionized water is aerated with high-purity nitrogen for 1 hour to remove oxygen in the deionized water, and the deionized water for preparing solutions in subsequent steps is prepared with the deoxygenated deionized water. Then KNO 3 (10.12g) and KOH (5.62g) were dissolved in 400ml of deoxygenated deionized water, and 100ml of 0.2mol / L FeSO 4 solution, accompanied by nitrogen protection. After 4 hours of stirring, a black precipitate was formed in the solution, and the black precipitate was separated by magnetism and washed 3 times with ethanol and 3 times with deionized water, and dried in a vacuum oven at 70°C to obtain black nano-Fe 3 o 4 particles.

[0039] (2) Nano Fe 3 o 4 SiO 2 preparation of

[0040] Preparation of nano-Fe 3 o 4 SiO 2 Particles, using the principle of tetraethyl orthosilicate (TEOS) hydrolysis, in...

Embodiment 2

[0052] Preparation of target pollutant aspirin solution: Dissolve a certain amount of aspirin in water to prepare an aspirin solution with a concentration of 1000 mg / L.

[0053] In the aspirin solution of 1000mg / L of 1.5L above-mentioned preparations, add 1.5g of magnetic cerium dioxide ozone catalyst prepared by the method of embodiment 1, after mixing evenly, add in the internal circulation ozone catalytic reactor to react and aerate for 120min, use high-efficiency liquid Phase chromatography and TOC detector detect the amount of aspirin and TOC in the solution during the reaction. Ozone, Fe 3 o 4 and Fe 3 o 4 SiO 2 As a comparative experiment.

[0054] The change curve of aspirin content with reaction time is as follows Figure 6 As shown in a, the removal rate of aspirin with the reaction time can be obtained correspondingly. After 60 minutes of reaction, the Fe 3 o 4 SiO 2 CeO 2 As a catalyst, the removal rate of aspirin was 81.0%, while Fe 3 o 4 and Fe 3 o 4 ...

Embodiment 3

[0056] With reference to the method preparation concentration among the embodiment 1, be the aspirin solution of 1000mg / L. In the aspirin solution of 1000mg / L of 1.5L above-mentioned preparations, add 1.5g of magnetic cerium dioxide ozone catalyst prepared by the method of embodiment 1, after mixing evenly, add in the internal circulation ozone catalytic reactor to react and aerate for 120min, use high-efficiency liquid Phase chromatography and TOC detector detect the amount of aspirin and TOC in the solution during the reaction. After the reaction, the catalyst was recovered by magnetic separation, and the experiment was continued for 3 times according to the above method. Compare the effect of catalyst reuse.

[0057] Experimental results such as Figure 7 Shown, are successively the change curve of aspirin content with reaction time in 3 experiments. After three consecutive reactions, the catalytic activity of the magnetic ceria ozone catalyst did not decrease significan...

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Abstract

The invention relates to a magnetic nano cerium dioxide ozone catalyst, which comprises nano ferroferric oxide core, an silica interface layer wrapped the nano ferroferric oxide core and a cerium dioxide active ingredient loaded on the silica interface layer; in the magnetic nano cerium dioxide ozone catalyst, the mass ratio of ferroferric oxide to silica to cerium dioxide is 1: 0.3-0.8: 3-5. The invention also discloses a preparation method and an application of the cerium dioxide ozone catalyst in the process of ozone catalysis and organic waste water degradation. The magnetic nano cerium dioxide ozone catalyst can rapidly degrade the organic pollutant in waste water, and is easy to magnetically recovery, and the magnetic nano cerium dioxide ozone catalyst has good continuous usability and low metal ion leaching rate, and provides a rapid and effective processing method for enhancing ozone technology, removing organic waste water pollutant and industrial application.

Description

(1) Technical field [0001] The invention relates to a magnetic nano ceria ozone catalyst with a core / shell structure, a preparation method and application thereof. (2) Background technology [0002] At present, a large amount of industrial wastewater produced in chemical, dyestuff, pharmaceutical and other industries does not meet the discharge standards stipulated by the state, and is likely to cause secondary pollution; these wastewaters are characterized by high concentration, high toxicity, and poor biodegradability. It is difficult to achieve the ideal removal effect by this method, which has attracted widespread attention. Ozone has attracted more and more attention due to its high redox potential (2.07V), goodness to the environment and potential application. Especially under alkaline conditions, ozone decomposes to produce extremely strong oxidizing hydroxyl radicals, which react with organic substances for substitution, addition, electron transfer, bond breaking, e...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): B01J23/83B01J35/00C02F1/78
Inventor 戴启洲陈建孟王佳裕鱼杰
Owner ZHEJIANG UNIV OF TECH
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