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Preparation method of nanosilver-graphene composite material

A composite material and graphene technology, applied in the field of nanomaterials, achieves the effects of short time consumption, good safety and high efficiency

Inactive Publication Date: 2015-02-18
SUZHOU ZHENGYECHANG INTELLIGENT TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

There is no direct use of persimmon tannin in the preparation of nano-silver-graphene composites in one step

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0016] Crush immature natural persimmons through a 60-mesh sieve, add deionized water and enzyme with a mass fraction of 0.1‰, and perform ultrasonic extraction. The ultrasonic power is 80w, the ultrasonic time is 10min, the ultrasonic temperature is 30°C, the pH value of enzymatic hydrolysis is 5, and the ratio of solid to liquid The ratio is 1:5, and the treated extract is vacuum filtered and dried to obtain persimmon tannins. The enzyme is a mixture of cellulase and pectinase with a mass ratio of 1:1.

[0017] Mix 100ml of persimmon tannin aqueous solution with a mass percentage of 1%, 5ml of 10g / L silver ammonia solution and 1ml of 0.01g / L graphene oxide solution, sonicate at 40°C for 24h, and use deionized water to After the reaction product is washed and suction-filtered several times, it is vacuum-dried to obtain the nano-silver-graphene composite material.

Embodiment 2

[0019] Crush immature natural persimmons through a 60-mesh sieve, add deionized water and an enzyme with a mass fraction of 0.3‰, and perform ultrasonic extraction. The ultrasonic power is 100w, the ultrasonic time is 30min, the ultrasonic temperature is 40°C, the pH value of the enzymatic hydrolysis is 6, and the ratio of solid to liquid The ratio is 1:10, and the treated extract is vacuum filtered and dried to obtain persimmon tannins. The enzyme is a mixture of cellulase and pectinase with a mass ratio of 1:1.

[0020] Mix 80ml of 5% persimmon tannin aqueous solution by mass, 5ml of 5g / L silver ammonia solution and 1ml of 0.02g / L graphene oxide solution, ultrasonicate at 60°C for 14h, and use deionized water to After the reaction product is washed and suction-filtered several times, it is vacuum-dried to obtain the nano-silver-graphene composite material.

Embodiment 3

[0022] Crush immature natural persimmons through a 60-mesh sieve, add deionized water and an enzyme with a mass fraction of 0.5‰, and perform ultrasonic extraction. The ultrasonic power is 120w, the ultrasonic time is 60min, the ultrasonic temperature is 50°C, the pH value of the enzymatic hydrolysis is 6, and the ratio of solid to liquid The ratio is 1:20, and the treated extract is vacuum filtered and dried to obtain persimmon tannins. The enzyme is a mixture of cellulase and pectinase with a mass ratio of 1:1.

[0023] Mix 10ml of 5% persimmon tannin aqueous solution by mass, 1ml of 1g / L silver ammonia solution and 1ml of 0.05g / L graphene oxide solution, ultrasonicate for 4 hours at 80°C, and use deionized water to After the reaction product is washed and suction-filtered several times, it is vacuum-dried to obtain the nano-silver-graphene composite material.

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Abstract

The invention relates to a preparation method of a nanosilver-graphene composite material. The preparation method comprises the following steps: extracting persimmon tannin by an enzyme and ultrasonic-assisted extraction process, mixing 0.01%-10% by mass of a persimmon tannin aqueous solution and 0.01-100 g / L of a silver ammonia solution with 0.01-0.05 g / L of a graphene oxide solution according to a volume ratio of (100 to 10 to 1) to (1 to 1 to 1), ultrasonically processing at 40-80 DEG C for 1-24 hours, washing a reaction product by de-ionized water for multiple times, performing suction filtration, and drying in vacuum to obtain the nanosilver-graphene composite material. Compared with a conventional solvent extraction process, the enzyme and ultrasonic-assisted extraction process adopted for extracting persimmon tannin has the characteristics of no high temperature, good safety, short time and high efficiency; meanwhile, the nanosilver-graphene composite material is prepared in one step by adopting graphene oxide and silver ammonia as raw materials and environment-friendly persimmon tannin as a reducing agent.

Description

technical field [0001] The invention belongs to the technical field of nanometer materials, in particular to a preparation method of nanometer silver-graphene composite material. Background technique [0002] In 2004, Andre Geim and Konstantin Novoselov, physicists at the University of Manchester in the United Kingdom, successfully separated graphene with single-layer atomic arrangement from graphite by tearing scotch tape. Therefore, he won the Nobel Prize in Physics in 2010 (Science, 2004, 306(5696):666-669). Graphene consists of carbon atoms with sp 2 The hybrid orbitals form a hexagonal honeycomb lattice, and its structural unit is a carbon six-membered ring, which is a two-dimensional material with a thickness of only a single layer of carbon atoms. Graphene is the basic structural unit that constitutes carbon-based materials. It can be wrapped to form zero-dimensional Fullerenes, rolled into one-dimensional carbon nanotube, and stacked layer by layer to form three-d...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): B22F9/24B22F1/02
Inventor 赵兵
Owner SUZHOU ZHENGYECHANG INTELLIGENT TECH
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