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Nano silver catalyst with thermosensitivity and magnetic property and preparation method thereof

A technology of magnetic nanoparticles and nano-silver, which is applied in the preparation of organic compounds, chemical instruments and methods, organic compounds/hydrides/coordination complex catalysts, etc. Activity, achieve repeated use, overcome the effects of not easy to recycle and easy to aggregate

Inactive Publication Date: 2014-05-07
SHAANXI NORMAL UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0004] The technical problem to be solved by the present invention is to overcome the problem that nano-silver is not easy to recycle and easy to aggregate in the catalytic process, and to provide a composite of nano-silver, magnetic nanoparticles and microgel, which is easy to realize the reusability of nano-silver. Avoid the agglomeration of nano-silver particles, improve its catalytic activity, and at the same time endow the catalyst with temperature sensitivity and magnetic properties, and provide a simple preparation method for the catalyst

Method used

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  • Nano silver catalyst with thermosensitivity and magnetic property and preparation method thereof
  • Nano silver catalyst with thermosensitivity and magnetic property and preparation method thereof
  • Nano silver catalyst with thermosensitivity and magnetic property and preparation method thereof

Examples

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Embodiment 1

[0023] 1. Preparation of ferroferromagnetic nanoparticle-loaded silver nanocomposites

[0024] Ultrasonic disperse 0.25g of ferroferric oxide magnetic nanoparticles with a particle size of 15-20nm in 79g of absolute ethanol, add 1g of aminopropyltrimethoxysilane dropwise, ferroferric oxide magnetic nanoparticles and absolute ethanol, aminopropyl The mass ratio of trimethoxysilane was 1:316:4, stirred at room temperature for 6 hours, and the product was separated magnetically three times by alternately using absolute ethanol and double-distilled water, and vacuum-dried at 70°C for 1.5 hours to obtain amino-modified ferric iron tetroxide Nanoparticles.

[0025] Ultrasonic disperse 0.025g of amino-modified iron ferric oxide nanoparticles in 90mL of absolute ethanol to prepare a 0.28mg / mL ferric oxide dispersion. mol / L silver ammonia solution (the mass fraction of ammonia water used is 25% to 28%), stir at room temperature for 1 hour, add dropwise 3mL of 0.03mol / L sodium hydroxid...

Embodiment 2

[0029] The step 1 of preparing the composite of ferroferromagnetic nanoparticles loaded with silver nanoparticles in this example is the same as that of Example 1. In step 2 of preparing a nano-silver catalyst with temperature sensitivity and magnetic properties, 0.02g ferroferric oxide magnetic nanoparticles loaded nano-silver composite, 0.3g N-isopropylacrylamide, 0.002g dodecyl Sodium sulfonate, 0.005g N,N'-methylenebisacrylamide, 0.10g 3-(methacryloyloxy)propyltrimethoxysilane are ultrasonically dispersed in 90g of double distilled water, other steps are the same as in Example 1 , prepared as a nano-silver catalyst with temperature sensitivity and magnetic properties (see Figure 5 ).

Embodiment 3

[0031] The step 2 of preparing the nano-silver catalyst with temperature sensitivity and magnetic properties in this embodiment is the same as that in embodiment 1. In preparation step 1 of the complex of nano-silver supported by ferroferric oxide magnetic nanoparticles, the silver ammonia solution with an initial concentration of silver nitrate of 0.75mol / L is the silver ammonia solution of 0.10mol / L with an equal volume of silver nitrate initial concentration Replacement, other steps are the same as in Example 1.

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Abstract

The invention discloses a nano silver catalyst with thermosensitivity and a magnetic property and a preparation method thereof. The core of the catalyst is a compound loaded with nano silver by ferroferric oxide magnetic nano particles and the shell of the catalyst is poly(N-isopropyl acrylamide-3-(methyl acryloyloxy) propyl trimethoxy silane); the particle size of the catalyst is 150-300nm and the saturation magnetization strength is 15-20emu / g, wherein the particle diameter of the ferroferric oxide magnetic nano particles is 15-20nm and the particle diameter of the nano silver is 9-12nm; the thickness of the poly(N-isopropyl acrylamide-3-(methyl acryloyloxy) propyl trimethoxy silane) is 20-50nm. The catalyst is prepared by an ethanol reduction method; the prepared catalyst integrates the catalytic property of the nano silver, the magnetic property of magnetic micro-particles and the thermosensitivity of micro-gel; the problem that the nano silver is not easy to recycle and is easy to collect in a catalysis process is solved; the catalytic activity is improved and the repeated utilization of the catalyst is realized.

Description

technical field [0001] The invention belongs to the technical field of catalysts, and in particular relates to a nano-silver catalyst with temperature sensitivity and magnetic properties, and a preparation method of the catalyst. Background technique [0002] Metal nanoparticles have become an efficient catalyst in the field of catalysis due to their unique properties such as small size and large specific surface area. Aggregation easily occurs, resulting in a decrease in catalytic activity. One of the methods to solve many unfavorable factors of nano-metals is to use carriers to load nano-metals, which can not only effectively increase the specific surface area of ​​nano-metals, but also stabilize nanoparticles and prevent aggregation. In order to solve the low utilization rate of nano-metals, people often combine metal nanoparticles with catalytic properties with substances with magnetic properties (such as ferric oxide, ferric oxide, nano-nickel, cobalt, etc.) performan...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): B01J31/28B01J35/02C07C213/02C07C215/76
Inventor 张颖范颖兰赵甲郭建武
Owner SHAANXI NORMAL UNIV