Preparation method and application of cellulose hydrogel-based nano-silver/silver chloride

A hydrogel-based, cellulose technology is applied in the field of preparation of cellulose hydrogel-based nano-silver/silver chloride, which can solve the problems of large particle size of nano-silver particles, and achieve mild conditions, low preparation cost, and equipment. request simple effects

Active Publication Date: 2020-11-24
HUNAN NORMAL UNIVERSITY
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

This method uses cellulose as the substrate, so that the nano-silver particles are evenly distributed on the cellulose substrate, but the part...

Method used

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  • Preparation method and application of cellulose hydrogel-based nano-silver/silver chloride
  • Preparation method and application of cellulose hydrogel-based nano-silver/silver chloride
  • Preparation method and application of cellulose hydrogel-based nano-silver/silver chloride

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Embodiment 1

[0055] The green preparation of cellulose hydrogel-based nano-silver / silver chloride of the present invention comprises the following steps:

[0056] (1) Preparation of cellulose solution

[0057] i. DMAC heat activation: add DMAC to an appropriate amount of cotton, and heat activate it at 160 °C for 40 minutes to obtain activated cotton.

[0058] ii. Pressing with a hydraulic press: press the activated cotton at 200°C for 1 min to obtain absorbent cotton.

[0059] iii. Stirring at high temperature: at 100 ℃, put 1g of absorbent cotton in 99g of 8.5 wt% LiCl / DMAC polar solution, stir for 3 hours, cool down to room temperature, continue to stir until dissolved, and set aside to obtain a clear cellulose solution.

[0060] (2) Add 50 g of cellulose solution and 0.6 g of tannic acid in 30 mL of DMAC to the three-necked flask, and add the DMAC solution of tannic acid dropwise into the three-necked flask under stirring at 25 °C, and the mixture Stir at 25 °C for 2 h to obtain reac...

Embodiment 2

[0069] The cellulose hydrogel-based nano silver / silver chloride prepared in Example 1 was used to reduce aromatic nitro compounds.

[0070] The cellulose hydrogel-based nano-silver / silver chloride prepared in Example 1 was dispersed in deionized water to prepare a 2 mg / mL catalyst suspension. Add 0.5 mL of the prepared catalyst to 3 mL of 0.2 mM p-nitrophenol, p-nitroaniline, and o-nitrophenol nitrate respectively, pass nitrogen gas for 20 minutes, then transfer the reaction solution to a cuvette, add 0.3 mL, 0.05 MNbH 4 , react at room temperature. The results of ultraviolet tracking reaction are as follows: Figure 11 , Figure 12 and Figure 13 . exist Figure 11 The catalytic reaction process was monitored by recording the characteristic absorption band of 4-NP at 400 nm as a function of reaction time. The intensity of the absorption peak at 400nm gradually decreases with time, and after about 5 minutes (without any stirring), the absorption peak completely disappea...

Embodiment 3

[0074] The cellulose hydrogel-based nano silver / silver chloride prepared in Example 1 was used to degrade organic dyes.

[0075] The cellulose hydrogel-based nano-silver / silver chloride prepared in Example 1 was dispersed in deionized water to prepare a 2 mg / mL catalyst suspension. Add 0.5 mL (2 mg / mL) of the prepared catalyst to 3 mL of 0.2 mM methyl orange, Congo red, alizarin yellow, and rhodamine-B respectively, pass nitrogen gas for 20 minutes, and then transfer the reaction solution to a cuvette , add 0.3 mL, 0.02M, 0.1 M, 0.2M NaBH 4 , react at room temperature. Ultraviolet tracking of the reaction results. The results of ultraviolet tracking reaction are as follows: Figure 16 , Figure 17 , Figure 18 and Figure 19 . It can be seen from the figure that methyl orange, Congo red, alizarin yellow and rhodamine-B were all reduced after about 4 min, 7 min, 13 min and 3 min (without any stirring).

[0076] Since sewage generally contains a variety of organic dyes, ...

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Abstract

The invention discloses a preparation method and application of cellulose hydrogel-based nano-silver/silver chloride. The method comprises the following steps: (1) under a stirring condition, dropwiseadding a tannic acid solution into a cellulose solution to form a reaction solution I, continuously stirring for 1-3 hours, adjusting the pH value of the reaction solution, heating, then adding glutaraldehyde, and continuously stirring to obtain a reaction solution II; and (2) dropwise adding an AgNO3 solution into the reaction solution II, continuously stirring to obtain a reaction solution III,dropwise adding the reaction solution III into violently stirred deionized water to obtain floccule turbid liquid, performing suction filtration, and washing to obtain a filter cake, namely the silver/silver chloride@cellulose nano composite material. The silver/silver chloride@cellulose nano composite material prepared by the method disclosed by the invention not only is uniform in nano silver and silver chloride distribution, less in agglomeration and smaller in average particle size, but also shows higher catalytic efficiency, and can reduce p-nitrophenol, o-nitrophenol, p-nitroaniline andvarious organic dyes in a short time.

Description

technical field [0001] The invention belongs to the field of preparation of noble metal catalysts, and in particular relates to a preparation method and application of cellulose hydrogel-based nano silver / silver chloride. Background technique [0002] Supported noble metal catalysts consist of noble metal active centers and supports. The noble metal is the active center. According to the type of noble metal, the supported catalyst is divided into Pd-based catalyst, Pt-based catalyst, Au-based catalyst, Ag-based catalyst and so on. Due to the superior cost advantage of silver and the unique optical and electronic properties of AgNPs, Ag-based catalysts have attracted wide attention in the catalytic community. However, like most metal nanoparticles, there is a serious aggregation problem due to the high surface energy of AgNPs, which reduces the specific surface area-volume ratio and thus affects the catalytic performance. In order to overcome this problem, AgNPs are usually...

Claims

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Application Information

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IPC IPC(8): C08J3/075C08J3/20C08J5/18C08L1/08C08K3/08C08K3/16B01J31/06B01J31/26B01J37/03C07C213/02C07C215/76
CPCC08J3/075C08J3/20C08J5/18B01J31/06B01J31/26B01J35/0013B01J35/023B01J37/036C07C213/02C08J2301/08C08K2003/0806C08K3/16B01J2231/641C07C2531/06C07C2531/26C07C215/76Y02P10/20
Inventor 喻宁亚张效敏张明珠
Owner HUNAN NORMAL UNIVERSITY
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