Nano-silver composite textile catalyst and application thereof

A nano-catalyst and nano-silver technology, applied in catalytic reactions, organic compound/hydride/coordination complex catalysts, physical/chemical process catalysts, etc., can solve harsh conditions, unsuitable for large-scale applications, post-processing hazards and other problems, to achieve the effect of easy preparation, good catalytic effect and low price

Active Publication Date: 2016-09-07
HENAN UNIVERSITY
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, this method has harsh conditions and dangerous post-processing, and is not suitable for large-scale applications.

Method used

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  • Nano-silver composite textile catalyst and application thereof
  • Nano-silver composite textile catalyst and application thereof
  • Nano-silver composite textile catalyst and application thereof

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0013] Embodiment 1: Preparation and standard of nano-silver composite textile catalyst

[0014] The nano-silver composite textile catalyst was prepared by a one-step in situ growth synthesis method. White cotton textiles were first washed in deionized water and dried. Take 43 grams of washed cotton and place it in a mixed aqueous solution of silver nitrate and 3-aminopropyltriethoxysilane (water temperature: 60°C, AgNO 3 Concentration 2.72mM), soak for 10 minutes; take out the sample and wash it with deionized water, then put the sample in 5mM sodium borohydride aqueous solution at room temperature, soak for 10 minutes, it can be observed that the cotton cloth gradually changes from white to yellow, It shows the formation of nano-silver particles on the textile, and then the nano-silver composite textile catalyst can be obtained through the subsequent washing and drying process.

[0015] Such as figure 1 As shown, in the synthesized nano-silver composite textile, the nano-...

Embodiment 2

[0016] Example 2: Nano-silver composite textile catalyzes the reduction reaction of nitro compounds

[0017] Using the nano-silver composite textile in Example 1 as a catalyst, we first tried to catalyze the reduction reaction of nitrophenol. Specifically: take 0.2mmol 4-nitrophenol, 1mmolNaBH 4 and 2cm 2 The nano-silver composite textile catalyst was mixed in THF / H at room temperature 2 In O (1ml / 1ml) solution, it can be found by tracking the reaction that 4-nitrophenol can be reduced to 4-aminophenol in 3 hours; at the same time, our negative control test shows that in the absence of adding nano-silver composite textile The catalyst is in the reaction system (other reaction conditions are the same), and no reaction occurs.

[0018] Table 1: Cases of nitro reduction reaction catalyzed by nano-silver composite textile

[0019]

[0020] Reaction conditions: 0.2mmol substrate, 1mmol NaBH 4 and 2cm 2 Nanosilver composite textile catalyst in THF / H 2 O (1ml / 1ml) mixture w...

Embodiment 3

[0022] Example 3: Recycling of nano-silver composite textile catalysts to catalyze the reduction reaction of nitro compounds

[0023] The biggest advantage of nano-silver composite textile catalyst is that it can be recycled. In order to demonstrate its feasibility, we choose 2-methyl-5-nitro-1H-indole as the substrate for research (because of its reduction product and substrate easily separated and purified by chromatography). We take the standard reaction conditions in Example 2 as experimental conditions, we first detect the silver overflow content in the reaction solution after the nano-silver composite textile catalytic reaction finishes by inductively coupled plasma analysis method (ICP-MS), find that only 60ppb Silver appears in the reaction solution, its content is very low.

[0024] On the other hand, under the above reaction conditions, we evaluated the cyclic catalytic times of the nano-silver composite textile catalyst. We controlled the reaction time at 7 hours. ...

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Abstract

The invention discloses a nano-silver composite textile catalyst and an application thereof. The nano catalyst is prepared by loading nano-silver to the surface of a textile material. Nano-silver particles are loaded on the surfaces of textile fibers by virtue of an in-situ growth method, and the particle size of the nano-silver particles is between 1-50nm; the nano-silver composite textile material shows a good catalytic effect, and can quickly reduce a nitro-compound and an ester compound under a room temperature condition, thereby effectively solving the problem of a severe condition for a reduction reaction of the ester compound at present; and the nano-silver composite textile catalyst is easy to prepare, can be used repeatedly, is low in price, and can be used for large-scale production. The nano-silver composite textile catalyst can quickly reduce an aromatic nitro-compound into aromatic amine at room temperature, and can reduce the ester compound into alcohol by taking an aqueous solvent as a reaction medium at room temperature. The nano-silver composite textile catalyst disclosed by the invention can also be recycled.

Description

technical field [0001] The invention discloses a nano-silver composite textile catalyst and its application. Background technique [0002] Nanoparticle materials have begun to be used in catalytic reactions due to their ultra-high surface area / volume ratio and unique catalytic active sites. However, although nanocatalysts have very good catalytic performance, dispersed nanomaterials are very easy to agglomerate in the reaction solution and cannot be used effectively; at the same time, after the end of the chemical process, the recovery of the catalyst is a great challenge. In the recovery process, centrifugation is often used, which will cause the aggregation of nanoparticles, thereby rapidly reducing the secondary catalytic performance of nanoparticles. We can see that it is very challenging to develop simple and affordable nanocatalysts and their recovery technology. Among them, dispersing and loading nanocatalysts on solid supports is an effective method. Existing solid...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): B01J31/06C07C209/36C07C211/46C07B31/00C07C213/02C07C215/76C07C213/00C07C215/68C07C215/86C07C217/84C07C211/52C07D209/08C07C29/147C07C33/22C07C37/055C07C39/11C07C269/06C07C271/16
CPCB01J31/06B01J35/006B01J35/0093B01J35/06B01J2231/64C07B31/00C07C29/147C07C37/0555C07C209/325C07C213/00C07C213/02C07C269/06C07D209/08C07C215/76C07C215/68C07C211/46C07C215/86C07C217/84C07C211/52C07C33/22C07C39/11C07C271/16
Inventor 刘洪均冯伟
Owner HENAN UNIVERSITY
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