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Method for synthesizing nano-silver colloid with green coffee bean extract as reducing agent

A technology of green coffee beans and nano-silver glue is applied in the fields of botanical equipment and methods, chemicals for biological control, biocides, etc., which can solve problems such as short preparation time, and achieve simple operation, good stability, Environmentally green friendly effect

Inactive Publication Date: 2015-12-09
YANGZHOU UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0004] The present invention aims at inventing a method for preparing nano-silver with a smaller size by using the green reduction method, and the preparation time is short. problem, the prepared nano-silver has better antibacterial effect

Method used

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  • Method for synthesizing nano-silver colloid with green coffee bean extract as reducing agent
  • Method for synthesizing nano-silver colloid with green coffee bean extract as reducing agent
  • Method for synthesizing nano-silver colloid with green coffee bean extract as reducing agent

Examples

Experimental program
Comparison scheme
Effect test

Embodiment example 1

[0032] Weigh 0.1275g of silver nitrate and put it in a beaker, and dissolve it completely with 15ml of deionized water. The prepared solution was wrapped in tin foil and kept away from light for later use.

[0033] Weigh 0.4030g of green coffee bean extract as reducing agent and dissolve in 20ml of deionized water. Stir well to ensure complete dissolution.

[0034] The green coffee bean extract was added dropwise into the silver nitrate solution, and the reaction was carried out at room temperature, and the dropping rate was kept at 1 drop / second. Continue to stir for 10 minutes after dropping to ensure that the silver nitrate has reacted completely. Get nano silver glue.

[0035] The prepared nano-silver colloid Ag1 is scanned under a low-power and high-power transmission electron microscope, figure 1 It is the result of low power transmission electron microscope, Figure 4 High magnification transmission electron microscope image.

[0036] The synthesized nano-silver c...

Embodiment example 2

[0039] Weigh 0.2550g of silver nitrate and put it in a beaker, and dissolve it completely with 15ml of deionized water. The prepared solution was wrapped in tin foil and kept away from light for later use.

[0040] Weigh 0.8060 g of green coffee bean extract and dissolve it in 20 ml of deionized water as a reducing agent. Stir well to ensure complete dissolution.

[0041] The green coffee bean extract was added dropwise into the silver nitrate solution, and the reaction was carried out at room temperature, and the dropping rate was kept at 1 drop / second. Continue to stir for 10 minutes after dropping to ensure that the silver nitrate has reacted completely. Get nano silver glue.

[0042] The prepared nano-silver colloid Ag2 is scanned under a low power transmission electron microscope, figure 2 It is the result of transmission electron microscopy.

[0043] The synthesized nano-silver colloid Ag2 is scanned with an ultraviolet-visible absorption spectrometer, Figure 5 I...

Embodiment example 3

[0045] Weigh 0.5100g of silver nitrate and put it in a beaker, and dissolve it completely with 15ml of deionized water. The prepared solution was wrapped in tin foil and kept away from light for later use.

[0046] Weigh 1.6120g of green coffee bean extract as reducing agent and dissolve in 20ml of deionized water. Stir well to ensure complete dissolution.

[0047] The green coffee bean extract was added dropwise into the silver nitrate solution, and the reaction was carried out at room temperature, and the dropping rate was kept at 1 drop / second. Continue to stir for 10 minutes after dropping to ensure that the silver nitrate has reacted completely. Get nano silver glue.

[0048] The prepared nano-silver colloid Ag3 is scanned under a low-magnification transmission electron microscope, image 3 It is the result of transmission electron microscopy.

[0049] The synthesized nano-silver colloid Ag3 is scanned with an ultraviolet-visible absorption spectrometer, Figure 5 I...

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Abstract

The invention relates to a method for synthesizing nano-silver colloid with a green coffee bean extract as a reducing agent. The method comprises the following steps that an oxidizing agent for a reaction is prepared; silver salt is dissolved in deionized water and stirred till the silver salt is completely dissolved, and the prepared oxidizing agent is used in a standby manner; the reducing agent for the reaction is prepared; a plant extract is dissolved in deionized water and stirred till the plant extract is completely dissolved, and the prepared reducing agent is used in a standby manner; the nano silver colloid with the small particle size is synthesized; and the prepared reducing agent is dripped in the oxidizing agent, dripping and stirring are carried out at the same time, stirring is continuously carried out for ten minutes after dripping is finished, and the complete reaction can be ensured. The method for synthesizing the nano-silver colloid with the green coffee bean extract as the reducing agent is low in cost, easy to operate and environment-friendly. Compared with nano-silver prepared through a traditional method, the prepared nano-silver is smaller in size and better in antibacterial effect.

Description

technical field [0001] The invention relates to a method for synthesizing nano-silver colloid by using green coffee bean extract as a reducing agent, and belongs to the technical field of nano-silver colloid preparation. Background technique [0002] Antibacterial materials refer to a new class of functional materials that have powerful functions of killing or inhibiting microorganisms (bacteria, fungi, yeast, algae, viruses, etc.) within a certain period of time. Antibacterial materials have been widely used in people's daily life and in the development of industry and agriculture. Especially in recent years, the environment is extremely deteriorating, and people's demand for powerful antibacterial materials is also increasing. At present, more antibacterial materials refer to adding certain antibacterial substances, that is, antibacterial agents, so that the material has the ability to inhibit or kill microorganisms attached to its own surface or adjacent to it. Antimicr...

Claims

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Application Information

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IPC IPC(8): B22F9/24A01N59/16A01P1/00A01P3/00B82Y40/00
Inventor 朱沛志张文静
Owner YANGZHOU UNIV
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