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Method for preparing nano-silver by utilizing persimmon tannin as reductant

A nano-silver and reducing agent technology, applied in the field of nano-materials, can solve the problems of environmental hazards, high production costs, and high requirements for equipment, and achieve the effects of good stability, mild reaction, and wide source of raw materials

Inactive Publication Date: 2014-02-05
SUZHOU ZHENGYECHANG INTELLIGENT TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

The physical method has high requirements on instruments and equipment, and the production cost is expensive
Chemical methods often use hydrazine hydrate, formaldehyde, polyols, organic amines, etc. as reducing agents. Although these reducing agents have high activity, they are harmful to the environment, and the prepared nano-silver is prone to agglomeration

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0014] 1, a kind of preparation method adopting persimmon tannin as the nano-silver of reducing agent, it is characterized in that the preparation method comprises the following steps:

[0015] (1) Preparation of persimmon tannins: After cleaning immature natural persimmons with deionized water, put them into a food grinder to crush them into juice, add a certain amount of deionized water, and then perform ultrasonic extraction on the mixed juice , ultrasonic power 80%, ultrasonic time 40min, ultrasonic temperature 30°C, material-liquid ratio 1:5, vacuum filter the mixed juice after ultrasonic treatment, and dry to obtain persimmon tannin;

[0016] (2) Preparation of nano-silver: Mix persimmon tannin aqueous solution with a mass percentage of 1% and silver ammonia solution with a volume molar concentration of 10mmol / L at a volume ratio of 5:1, adjust the pH value to 9, and mix it at 60°C Stirring for 30 minutes under temperature conditions, the nano-silver solution can be obta...

Embodiment 2

[0020] 1, a kind of preparation method adopting persimmon tannin as the nano-silver of reducing agent, it is characterized in that the preparation method comprises the following steps:

[0021] (1) Preparation of persimmon tannins: After cleaning immature natural persimmons with deionized water, put them into a food grinder to crush them into juice, add a certain amount of deionized water, and then perform ultrasonic extraction on the mixed juice , ultrasonic power 80%, ultrasonic time 50min, ultrasonic temperature 40°C, material-liquid ratio 1:5, vacuum filter the mixed juice after ultrasonic treatment, and dry to obtain persimmon tannin;

[0022] (2) Preparation of nano-silver: Mix persimmon tannin aqueous solution with a mass percentage of 1% and silver ammonia solution with a volume molar concentration of 20mmol / L at a volume ratio of 10:1, adjust the pH value to 10, and mix it at 70°C Stirring for 60 minutes under the temperature condition, the nano-silver solution can be...

Embodiment 3

[0026] 1, a kind of preparation method adopting persimmon tannin as the nano-silver of reducing agent, it is characterized in that the preparation method comprises the following steps:

[0027] (1) Preparation of persimmon tannins: After cleaning immature natural persimmons with deionized water, put them into a food grinder to crush them into juice, add a certain amount of deionized water, and then perform ultrasonic extraction on the mixed juice , ultrasonic power 80%, ultrasonic time 60min, ultrasonic temperature 50°C, material-liquid ratio 1:10, vacuum filter the mixed juice after ultrasonic treatment, and dry to obtain persimmon tannin;

[0028] (2) Preparation of nano-silver: Mix persimmon tannin aqueous solution with a mass percentage of 1% and silver ammonia solution with a volume molar concentration of 30mmol / L at a volume ratio of 15:1, adjust the pH value to 11, and mix it at 80°C Stirring for 90 minutes under the temperature condition, the nano-silver solution can b...

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Abstract

The invention relates to a method for preparing nano-silver by utilizing persimmon tannin as reductant. The method includes firstly, preparing persimmon tannin by an ultrasonic extraction method, mixing 1% of persimmon tannin water solution with 10-30mmol / L of silver ammonia solution by volume ratio of 5:1to 15:1, adjusting the pH (potential of hydrogen) value within 9-11, stirring for 10-120min at the temperature of 60-80 DEG C, and finally obtaining nano-silver solution with particle size ranging from 1nm to 50nm. The method adopting the persimmon tannin as capturing agent and reductant for silver ions has no demand for other stabilizer and protective agent and has the advantages of rich raw material resources, mild reaction, environment friendliness and the like.

Description

technical field [0001] The invention belongs to the field of nanometer materials, in particular to a method for preparing nanometer silver using persimmon tannin as a reducing agent. Background technique [0002] my country is the origin and main producing country of persimmon, which is distributed in 23 provinces, municipalities and autonomous regions. The output is extremely large, accounting for 70% of the world's total output. The tannin content in astringent persimmon fruit is between 0.13% and 1.54%. A fruit with the highest content. Persimmon tannin is a natural polymer polyphenolic compound, which has important applications in heavy metal ion adsorption, antibacterial, and leather tanning agents. For example, the Chinese invention patent of persimmon tannin adsorption material adsorption and recovery of heavy metals (CN201210043670.2) dissolves cowhide collagen fibers and persimmon powder in water, reacts, adds glutaraldehyde or formaldehyde, filters after reaction a...

Claims

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Application Information

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IPC IPC(8): B22F9/24
Inventor 赵兵
Owner SUZHOU ZHENGYECHANG INTELLIGENT TECH
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