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A kind of strontium ferrite loaded nano-silver composite material and preparation method thereof

A strontium ferrite and composite material technology, which is applied in the field of preparation of strontium ferrite-supported nano-silver composite materials, can solve the problems of unfavorable catalyst recycling, many types of pollutants, large industrial waste water discharge, and the like, and achieves operating costs. low cost effect

Inactive Publication Date: 2018-06-19
JIANGSU UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

[0002] Due to the large amount of industrial wastewater discharged, the variety of pollutants, and the wastewater contains a large amount of organic matter that is difficult to degrade, the traditional water treatment process is powerless to the wastewater containing a large amount of organic pollutants, especially organic matter with poor solubility.
In recent years, catalytic oxidation technology, especially semiconductor materials such as TiO 2 The photocatalytic oxidation technology as a catalyst has become a research hotspot in water pollution treatment, but its practical application requires the excitation of ultraviolet light. Since the proportion of ultraviolet light in sunlight is less than 5%, its reaction efficiency needs to be improved. high equipment cost
In addition, many catalysts used in sewage treatment are difficult to recycle, causing pollution to the environment, and it is not conducive to the recycling of catalysts, resulting in waste of resources

Method used

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  • A kind of strontium ferrite loaded nano-silver composite material and preparation method thereof
  • A kind of strontium ferrite loaded nano-silver composite material and preparation method thereof
  • A kind of strontium ferrite loaded nano-silver composite material and preparation method thereof

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0023] (1) Take 10ml of silver nitrate solution with a concentration of 0.05mol / L, add 2ml of NaOH solution with a concentration of 0.5mol / L, and then add 1ml of ammonia water with a mass fraction of 10% after a dark brown precipitate is formed, and stir until the precipitate disappears to obtain silver ammonia solution;

[0024] (2) Add 0.3g of strontium ferrite to the silver ammonia solution, add 13ml of PVP solution with a mass fraction of 1.0% after ultrasonication for 1h, and ultrasonication for 10min to obtain solution A; Hydrazine solution was added dropwise to solution A, mechanically stirred for 2 hours, and reacted at 30°C to obtain a suspension;

[0025] (3) Centrifuge the suspension, wash it three times with distilled water and absolute ethanol, and dry it at 45°C to obtain evenly dispersed strontium iron with a diameter of 2.50±0.5μm and a silver particle diameter of 10±0.05nm. Oxygen-supported nano-silver catalyst. The XRD of the obtained sample is as figure 1...

Embodiment 2

[0027] (1) Take 8ml of silver nitrate solution with a concentration of 1mol / L, add 1.5ml of NaOH solution with a concentration of 2mol / L, and then add 1ml of ammonia water with a mass fraction of 15% after a dark brown precipitate, stir until the precipitate disappears, and obtain a silver ammonia solution ;

[0028] (2) Add 0.3g of strontium ferrite to the silver ammonia solution, add 10ml of PVP solution with a mass fraction of 1.4% after ultrasonication for 1h, and ultrasonicate for 30min to obtain solution A; Hydrazine solution was added dropwise to solution A, mechanically stirred for 2 hours, and reacted at 60°C to obtain a suspension;

[0029] (3) Centrifuge the suspension, wash three times with distilled water and absolute ethanol, and dry at 50°C to obtain evenly dispersed strontium iron with a diameter of 1.50±0.5μm and a silver particle diameter of 20±0.05nm. Oxygen-supported nano-silver catalyst.

Embodiment 3

[0031] (1) Take 10ml of silver nitrate and silver fluoride solution with a concentration of 0.75mol / L, add 1.0ml of NaOH solution with a concentration of 1.0mol / L, and then add 1ml of ammonia water with a mass fraction of 12%, and stir until the precipitation occurs Disappeared to obtain silver ammonia solution;

[0032] (2) Add 0.4g of strontium ferrite to the silver ammonia solution, add 12ml of PVP solution with a mass fraction of 1.2% after ultrasonication for 1h, and ultrasonicate for 20min to obtain solution A; Hydrazine solution was added dropwise to solution A, mechanically stirred for 2 hours, and reacted at 45°C to obtain a suspension;

[0033] (3) Centrifuge the suspension, wash three times with distilled water and absolute ethanol, and dry at 65°C to obtain evenly dispersed strontium iron with a diameter of 2.0±0.5μm and a silver particle diameter of 15±0.05nm. Oxygen-supported nano-silver catalyst.

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Abstract

The invention discloses a strontium ferrite-loaded nano-silver composite material and a preparation method thereof. The composite material is composed of a strontium ferrite carrier and nano-silver particles, and the nano-silver particles are coated on strontium ferrite by adopting catalytic reduction technology. body surface. The diameter of the composite material prepared by the invention is 0.5-3 μm, the diameter of the coated silver particles is 5-30 nm, and the diameter and coating amount of the silver nanoparticles are controllable. Because the strontium ferrite carrier in the composite material is a permanent magnet, it has the advantages of high coercive force, large saturation magnetization and good stability, which is beneficial to the recovery and recycling of the strontium ferrite-supported nano-silver composite catalyst. The composite catalyst prepared by the invention has excellent catalytic performance, is easy to recycle and reuse, has the advantages of environmental protection, and can be applied to degrade organic pollutants in industrial and domestic sewage.

Description

technical field [0001] The invention belongs to the technical field of preparation of nanocomposite materials, and in particular relates to a preparation method of strontium ferrite loaded nano silver composite material. Background technique [0002] Due to the large amount of industrial wastewater discharged, the variety of pollutants, and the wastewater contains a large amount of organic matter that is difficult to degrade, the traditional water treatment process is powerless to the wastewater containing a large amount of organic pollutants, especially organic matter with poor solubility. In recent years, catalytic oxidation technology, especially semiconductor materials such as TiO 2 The photocatalytic oxidation technology as a catalyst has become a research hotspot in water pollution treatment, but its practical application requires the excitation of ultraviolet light. Since the proportion of ultraviolet light in sunlight is less than 5%, its reaction efficiency needs to...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): B01J23/89C02F1/72
Inventor 徐松孟献丰周建伟唐茜
Owner JIANGSU UNIV
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