Method for preparing silver nano granules by reducing plant extract

A plant extract, silver nanoparticle technology, applied in the field of plant extract reduction to prepare silver nanoparticles, can solve the problems of slow reaction, need several hours to dozens of hours, etc., achieve high dispersibility and stability, improve The reduction reaction rate and the effect of simple process

Inactive Publication Date: 2010-12-15
XIAMEN UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

In the process of preparing silver nanoparticles by the biological reduction method, there is a problem that the reaction is relatively slow. For example, when the microbial reduction method is used, under the condition of a low silver ion concentration, it often takes dozens of hours of reaction time and requir...

Method used

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  • Method for preparing silver nano granules by reducing plant extract

Examples

Experimental program
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Effect test

Embodiment 1

[0016] Cinnamomum camphora leaves were dried in a blast drying oven at 60°C and then pulverized. Weigh 0.25g of Cinnamomum camphora leaf powder and add it into 50mL of deionized water, leaching at room temperature for 6h, filter and separate and remove leaf powder residue to obtain Cinnamomum camphora leaf extract, add 25mL of extract to a 50mL Erlenmeyer flask, and add 0.5mol / L silver ammonia solution 50μL, after shaking well, microwave continuous treatment at 420W power for 15s. Observing the reaction product with a transmission electron microscope (TEM), the obtained silver nanoparticles are all nearly spherical particles, most of the particle diameters are distributed in the range of 8-35nm, and the average particle diameter is 19.4nm.

Embodiment 2

[0018] Cinnamomum camphora leaves were dried in a blast drying oven at 60°C and then pulverized. Weigh 1g of Cinnamomum camphora leaf powder and add it to 50mL deionized water, leaching at room temperature for 6h, filter and separate and remove leaf powder residue to obtain Cinnamomum camphora leaf extract, add 25mL extract to a 50mL Erlenmeyer flask, and add 0.5mol / 100 μL of L silver ammonia solution, shake well and microwave treatment, under 700W power, with 5s as a treatment cycle, intermittent microwave treatment for three cycles. Observing the reaction product with a transmission electron microscope (TEM), the obtained silver nanoparticles are all nearly spherical particles, most of the particle diameters are distributed in the range of 9-27nm, and the average particle diameter is 18.3nm.

Embodiment 3

[0020] Cinnamomum camphora leaves were dried in a blast drying oven at 60°C and then pulverized. Weigh 2.5g of Cinnamomum camphora leaf powder and add it into 50mL deionized water, leaching at room temperature for 6h, filter and separate and remove the leaf powder residue to obtain Cinnamomum camphora leaf extract, add 25mL of extract to a 50mL Erlenmeyer flask, and add 0.5mol / L silver ammonia solution 250μL, shake well, microwave treatment, continuous treatment at 280W power for 30s. Observing the reaction product with a transmission electron microscope (TEM), the obtained silver nanoparticles are all nearly spherical particles, most of the particle diameters are distributed in the range of 11-29nm, and the average particle diameter is 18.1nm.

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Abstract

The invention discloses a method for preparing silver nano granules by reducing a plant extract, and relates to silver nano granules. The method for preparing the silver nano granules by reducing the plant extract is a method for quickly reducing Ag+ into Ag0 nano granules by using the plant extract with the aid of microwave. The method comprises the following steps of: drying plant leaves, and crushing the plant leaves into powder for later use; mixing and extracting the plant leaf powder and water, removing plant powder residue from the mixture, and taking the obtained plant extract as a reducing agent; and mixing the plant extract and silver salt solution, and reducing the mixture to obtain the silver nano granules. The method is simple, and can effectively improve the reduction reaction rate and obtain the nano silver granules with high dispersibility and stability besides many advantages of a biological reduction method for preparing the silver nano granules.

Description

technical field [0001] The invention relates to a silver nano particle, in particular to a method for preparing the silver nano particle by reducing a plant extract. Background technique [0002] As a noble metal nanomaterial with excellent performance, silver nanoparticles have been widely used in many fields such as chemical industry, electronics, biomedicine, etc. The partial oxidation of chemical and alcohols has excellent catalytic properties, silver nanoparticles have good antibacterial and bactericidal effects, and are widely used in the field of medical and health care. The preparation methods of silver nanoparticles have always been based on physical and chemical methods. The research on these two methods is relatively sufficient, and the technology is relatively mature. However, the production cost of the physical method is high, and some chemical reagents required by the chemical method are easy to use. pollute the environment. In recent years, with the increasi...

Claims

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Application Information

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IPC IPC(8): B22F9/24
Inventor 李清彪王惠璇林文爽王慧林丽芹杨欣孙道华黄加乐
Owner XIAMEN UNIV
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