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Preparation method of magnetic composite catalyst Ag/HNTs/Fe3O4

A composite catalyst and magnetic technology, used in chemical instruments and methods, physical/chemical process catalysts, metal/metal oxide/metal hydroxide catalysts, etc., can solve the problem of slow oxidation of magnetic carriers and air, and achieve Reuse is significant, the effect is significant, the effect of reducing direct contact

Inactive Publication Date: 2014-03-19
JIANGSU UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, if Fe 3 o 4 Nanoparticles are directly used as scaffolds for noble metals, and the magnetic carrier will slowly oxidize when in contact with air

Method used

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  • Preparation method of magnetic composite catalyst Ag/HNTs/Fe3O4
  • Preparation method of magnetic composite catalyst Ag/HNTs/Fe3O4
  • Preparation method of magnetic composite catalyst Ag/HNTs/Fe3O4

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Experimental program
Comparison scheme
Effect test

Embodiment 1

[0029] 1. A magnetic composite catalyst Ag / HNTs / Fe 3 o 4 The preparation method is characterized in that it is carried out according to the following steps:

[0030] (1) Halloysite nanotubes (HNTs) activation method

[0031] Blocky halloysite nanotubes were ground and pulverized, 50 mL of concentrated nitric acid was placed in 200 mL of distilled water, 20 g of ground halloysite nanotubes were placed in the above solution, and refluxed at 75 °C for 12 h to obtain The product was washed with double distilled water to neutrality, and dried at 60 °C to constant weight; finally, the dried halloysite nanotubes were calcined in a calciner at 200 °C for 2 h.

[0032] (2) Magnetic halloysite nanotube composites (HNTs / Fe 3 o 4 ) preparation

[0033] 0.66 g of activated HNTs and 0.33 g of ferric nitrate nonahydrate were dissolved in 25 g of absolute ethanol and dispersed ultrasonically for 60 minutes; then the mixture was evaporated to constant weight in a water bath at 60 °C; ...

Embodiment 2

[0048] 1. A magnetic composite catalyst Ag / HNTs / Fe 3 o 4 The preparation method is characterized in that it is carried out according to the following steps:

[0049] (1) Halloysite nanotubes (HNTs) activation method

[0050] The massive halloysite nanotubes were ground and pulverized, 50 mL of concentrated nitric acid was placed in 212.5 mL of distilled water, 19 g of ground halloysite nanotubes were placed in the above solution, and refluxed at 80 °C for 12.5 h, the obtained The product was washed with double distilled water to neutrality, and dried at 60 °C to constant weight; finally, the dried halloysite nanotubes were calcined in a calciner at 225 °C for 2.25 h.

[0051] (2) Magnetic halloysite nanotube composites (HNTs / Fe 3 o 4 ) preparation

[0052] 0.71 g of activated HNTs and 0.38 g of ferric nitrate nonahydrate were dissolved in 27.5 g of absolute ethanol and dispersed ultrasonically for 60 min; then the mixture was evaporated to constant weight in a water b...

Embodiment 3

[0060] 1. A magnetic composite catalyst Ag / HNTs / Fe 3 o 4 The preparation method is characterized in that it is carried out according to the following steps:

[0061] (1) Halloysite nanotubes (HNTs) activation method

[0062] Blocky halloysite nanotubes were ground and pulverized, 50 mL of concentrated nitric acid was placed in 225 mL of distilled water, 18 g of ground halloysite nanotubes were placed in the above solution, and refluxed at 80 °C for 13 h to obtain The product was washed with double distilled water to neutrality, and dried at 60 °C to constant weight; finally, the dried halloysite nanotubes were calcined in a calciner at 250 °C for 2.5 h.

[0063] (2) Magnetic halloysite nanotube composites (HNTs / Fe 3 o 4 ) preparation

[0064] 0.76 g of activated HNTs and 0.40 g of ferric nitrate nonahydrate were dissolved in 30 g of absolute ethanol and dispersed ultrasonically for 60 min; then the mixture was evaporated to constant weight in a water bath at 60 °C. T...

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Abstract

The invention relates to a preparation method of magnetic composite catalyst Ag / HNTs / Fe3O4, and belongs to the technical field of environmental function material preparation; a simple and effective chemical reduction method is used to prepare a Fe3O4 / Halloysite Nanotubes (HNTs / Fe3O4) magnetic composite material, then a silver nitrate solution and ammonia are mixed into a fresh silver ammonia solution as an oxidizing agent, glucose is used as a reducing agent, Ag nanoparticles are deposited on the magnetic composite material by a silver mirror reaction to prepare the magnetic composite catalyst Ag / HNTs / Fe3O4, and the magnetic composite catalyst Ag / HNTs / Fe3O4 is used for catalytic degradation of p-nitrophenol in a water solution.

Description

technical field [0001] The invention relates to a magnetic composite catalyst Ag / HNTs / Fe 3 o 4 The preparation method belongs to the technical field of environmental functional material preparation. Background technique [0002] Nitroaromatic compounds are toxic and biodegradable organic pollutants, widely used in the production of raw materials and intermediate products of explosives, pharmaceuticals, pesticides, pigments, dyes, wood preservatives, rubber additives and other fields. Among them, p-nitrophenol (4-NP) is an important member of nitroaromatic compounds due to its high chemical stability, water solubility, persistence, and biotoxicity. Therefore, 4-NP has been listed as a priority pollutant by the US Environmental Protection Agency. Due to the high stability and high solubility of 4-NP in aqueous solution, it is difficult to remove them from surface water and groundwater by traditional purification methods. So it is urgent to find an effective way to remo...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): B01J23/89
Inventor 潘建明甘梦颖张云雷瞿琴朱文静
Owner JIANGSU UNIV
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