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Preparation method of nano-silver with stable particle size

A nano-silver, particle size technology, applied in nanotechnology, energy and wastewater treatment, etc., can solve the problems affecting the yield and purification efficiency of nano-silver, and achieve significant low-cost advantages and industrial promotion prospects, controllable process, and reaction process. quick effect

Active Publication Date: 2020-12-11
NORTHEASTERN UNIV
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  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

[0003] At present, the biosynthesis methods of nano-silver mainly include microbial reduction method and plant reduction method. Some bacteria, fungi, etc. Reductant, but this method may have other by-products, affecting the yield and purification efficiency of nano-silver

Method used

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  • Preparation method of nano-silver with stable particle size
  • Preparation method of nano-silver with stable particle size
  • Preparation method of nano-silver with stable particle size

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Experimental program
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Embodiment 1

[0028] A preparation method of nano-silver with stable particle size, the specific operation steps are:

[0029] Step 1: Put 10mL of 0.2mol / L sodium citrate solution, 15mL of 0.1mol / L polyethylene glycol solution, 5mL of 0.05mol / L sodium tripolyphosphate solution and 40mL of 0.05mol / L sodium hydroxide solution into Mix in a three-necked flask, adopt the hydrothermal reaction method, and stir in a constant temperature water bath at 100°C for 5 minutes;

[0030] Step 2: Add 20 mL of 0.01 mol / L silver nitrate solution dropwise, and continue stirring in a constant temperature water bath at 100°C for 30 minutes after the dropwise addition to obtain a mother solution containing nano-silver;

[0031] Step 3: The mother liquor is washed with water several times and centrifuged at 8000 r / min for 20 minutes to obtain pure nano-silver with an average particle size of 19.6 nm.

[0032] The nano-silver SEM picture that present embodiment 1 prepares is as follows figure 1 As shown, the XR...

Embodiment 2

[0034] Step 1: 12.5 mL of 0.25 mol / L sodium citrate solution, 10 mL of 0.15 mol / L polyethylene glycol solution, 5 mL of 0.05 mol / L sodium tripolyphosphate solution and 40 mL of 0.05 mol / L sodium hydroxide solution Mix in a three-necked flask, adopt hydrothermal reaction method, and stir in a constant temperature water bath at 80°C for 5 minutes;

[0035] Step 2: Add 25 mL of 0.02 mol / L silver nitrate solution dropwise, and continue stirring in a constant temperature water bath at 80°C for 30 minutes after the dropwise addition to obtain a mother solution containing nano-silver;

[0036] Step 3: The mother liquor is washed with water several times and centrifuged at 8000 r / min for 20 minutes to obtain pure nano-silver with an average particle size of 21.2 nm.

[0037] The nano-silver SEM picture that present embodiment 2 prepares is as follows figure 2 shown.

Embodiment 3

[0039] Step 1: Mix 15 mL of 0.3 mol / L sodium citrate solution, 12.5 mL of 0.2 mol / L polyethylene glycol solution, 6.25 mL of 0.05 mol / L sodium tripolyphosphate solution and 0.1 mol / L sodium hydroxide solution 40mL was placed in a three-necked flask and mixed, using the hydrothermal reaction method, stirring in a constant temperature water bath at 80°C for 5min;

[0040] Step 2: Add 30 mL of 0.03 mol / L silver nitrate solution dropwise, and continue stirring in a constant temperature water bath at 80°C for 30 minutes after the dropwise addition to obtain a mother solution containing nano-silver;

[0041] Step 3: The mother liquor is washed with water several times and centrifuged at 9000 r / min for 15 minutes to obtain pure nano-silver with an average particle size of 18.8 nm.

[0042] The nano-silver SEM picture that present embodiment 3 prepares is as follows image 3 shown.

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Abstract

The invention discloses a preparation method of nano-silver with a stable particle size and belongs to the technical field of nano-material preparation. The preparation method comprises the followingsteps of firstly, weighing a sodium citrate solution, a polyethylene glycol solution, a sodium tripolyphosphate solution and a sodium hydroxide solution in proportion, putting into a reaction container, and performing stirring in a constant-temperature water bath; then dropwise adding a silver nitrate solution into the reaction container, and after dropwise adding, continuing to stir and react inthe constant-temperature water bath to obtain mother liquor containing nano-silver; and finally, washing the mother liquor for multiple times and performing centrifuging at a high speed to obtain purenano-silver with the average particle size of 20nm. The nano-silver prepared through the combined action of two protective agents is uniform in particle size, the high utilization rate of raw materials and high-purity synthesis of the nano-silver are achieved, and the preparation method has the remarkable low-cost advantage and industrial popularization prospects.

Description

technical field [0001] The invention belongs to the technical field of nanomaterial preparation, and in particular relates to a method for jointly preparing nano silver with a stable particle size by using two protective agents. Background technique [0002] In the past few decades, nano-silver has been widely used in various fields such as medical treatment, furniture, clothing, and energy due to its unique scale structure and performance advantages (antibacterial, catalytic, photoelectric, etc.). The biological and chemical preparation methods of multi-morphology and multi-size nano-silver have also been researched and reported. [0003] At present, the biosynthesis methods of nano-silver mainly include microbial reduction method and plant reduction method. Some bacteria, fungi, etc. Reductant, but this method may have other by-products, affecting the yield and purification efficiency of nano-silver. [0004] In the chemical synthesis of nano-silver, at present, a single...

Claims

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Application Information

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IPC IPC(8): B22F9/24B82Y40/00
CPCB22F9/24B82Y40/00Y02W10/37
Inventor 李海波王铭帅李英华莫凡李哲孔宇邓宁灿
Owner NORTHEASTERN UNIV
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