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Synthetic method of sliver/ferroferric oxide/silicon dioxide/titanium dioxide four-layer nuclear shell structure and application thereof

A technology of ferroferric oxide and core-shell structure, applied in the direction of metal/metal oxide/metal hydroxide catalyst, alkali metal oxide/hydroxide, chemical instruments and methods, etc., can solve the problem of small adsorption capacity, specific The surface is small, the adsorption and catalytic performance are not very good, etc., to achieve good adsorption characteristics, improve catalytic activity, and enhance the effect of adsorption and catalytic performance

Inactive Publication Date: 2014-05-21
HEFEI INSTITUTES OF PHYSICAL SCIENCE - CHINESE ACAD OF SCI
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

[0004] Although the magnetic adsorbents in the above prior art have good catalytic and separation effects, their adsorption and catalytic performances are not very good because of their small specific surface area or small adsorption capacity.

Method used

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  • Synthetic method of sliver/ferroferric oxide/silicon dioxide/titanium dioxide four-layer nuclear shell structure and application thereof
  • Synthetic method of sliver/ferroferric oxide/silicon dioxide/titanium dioxide four-layer nuclear shell structure and application thereof
  • Synthetic method of sliver/ferroferric oxide/silicon dioxide/titanium dioxide four-layer nuclear shell structure and application thereof

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specific Embodiment approach

[0038] The purposes of the above-mentioned silver / ferric oxide / silicon dioxide / titanium dioxide four-layer core-shell structure of the present invention, its preferred embodiment is:

[0039] The four-layer core-shell structure is used for the removal of organic pollutants and / or heavy metal pollutants.

[0040] After the four-layer core-shell structure removes organic pollutants and / or heavy metal pollutants, the catalyst powder used in the removal process is separated from the solution by magnetic separation, so as to facilitate the recycling of catalyst materials.

[0041] The present invention adopts technologies such as hydrothermal, sol-gel, and self-organized growth to prepare silver / ferric oxide / silicon dioxide / titanium dioxide core-shell structure, and silver has a strong plasma enhancement effect, which improves catalytic activity; magnetic nanoparticles have Superparamagnetic, so as to facilitate the recycling of catalyst materials; the outermost layer of titanium d...

specific Embodiment

[0042] Such as figure 1 As shown, the Ag / Fe3O4 core-shell structure (AgFe 3o 4 ),Reuse Silver / ferric oxide / silicon dioxide three-layer structure (AgFe 3 o 4 SiO 2 ), and then use the solvothermal method to coat a layer of burr-like titanium oxide composed of nanosheets on the surface of the above-mentioned core-shell structure to obtain silver / ferric oxide / silicon dioxide / titanium dioxide (AgFe 3 o 4 SiO 2 TiO 2 ) four-layer core-shell structure.

[0043] In the first step, ferric nitrate, sodium acetate, silver nitrate and ethylene glycol are mixed, then magnetically stirred at room temperature for 0.5-1h, and the mixed solution is transferred to a stainless steel reaction kettle with a Teflon substrate. Heat at 200 degrees Celsius for 8 hours. Wherein the molar ratio of ferric nitrate, sodium acetate, and silver nitrate is 400:3500:59, and the content of ethylene glycol is excessive. After the reaction is completed, the mixed solution is washed with deionized wat...

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Abstract

The invention discloses a synthetic method and application of a sliver / ferroferric oxide / silicon dioxide / titanium dioxide four-layer nuclear shell structure. The synthetic method of the sliver / ferroferric oxide / silicon dioxide / titanium dioxide four-layer nuclear shell structure comprises the steps of firstly preparing a sliver / ferroferric oxide nuclear shell structure by using a solvothermal method; then preparing a sliver / ferroferric oxide / silicon dioxide three-layer structure on the basis of the nuclear shell structure by using a stober method; coating a layer of burr shape titanium oxide composed of nanosheets on the surface of the three-layer structure obtained in the step B by using the solvothermal method to obtain a sliver / ferroferric oxide / silicon dioxide / titanium dioxide (AgFe3O4SiO2TiO2) four-layer nuclear shell structure. The four-layer nuclear shell structure is good in absorption characteristic, photocatalytic performance and superparamagnetism for removal of organic pollutants or heavy metal pollutants, so that the treatment effect of the organic pollutants and the heavy metal pollutants in sewage can be greatly improved.

Description

technical field [0001] The invention relates to a synthesis technology for removing substances of organic pollutants and heavy metal pollutants, in particular to a synthesis method and application of a silver / ferric oxide / silicon dioxide / titanium dioxide four-layer core-shell structure. Background technique [0002] With the rapid development of the economy, the amount of sewage discharge is increasing year by year, and the organic pollutants and heavy metal ions contained in it have seriously deteriorated the water resource environment. Various treatment methods have been tried, such as biodegradation, filtration and coagulation / flocculation / sedimentation, chemical redox, liquid phase exchange, membrane treatment, adsorption, and photocatalysis. However, the removal efficiency is limited, the conditions are harsh, and the cost is high, so it cannot be widely used at present. In contrast, adsorption and photocatalysis are efficient and practical methods, and have great pros...

Claims

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Application Information

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IPC IPC(8): B01J20/10B01J20/28B01J20/30C02F1/28C02F1/30B01J23/89B01J35/02
CPCY02W10/37
Inventor 苏建伟张云霞许思超王拴丁华霖李广海
Owner HEFEI INSTITUTES OF PHYSICAL SCIENCE - CHINESE ACAD OF SCI
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