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A method for detecting the concentration and rate of silver ions released during the dissolution of nano-silver

A dissolution process and detection method technology, applied in the direction of material excitation analysis, Raman scattering, etc., can solve the problem of inability to continuously detect the concentration of silver ions, the inability to obtain the release rate of nano-silver dissolved silver ions, and the inability to promote the study of nano-silver dissolution kinetics, etc. problems, achieve the effect of low cost, high sensitivity and simple operation

Active Publication Date: 2019-09-20
SOUTHEAST UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, the biggest defect of this method is that it cannot continuously detect the concentration of silver ions released during the dissolution of nano-silver, and can only roughly indicate the trend of silver ion release through scattered points.
More importantly, this method cannot obtain the release rate of silver ions during the dissolution process of nano-silver, and cannot advance the research on the dissolution kinetics of nano-silver.

Method used

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  • A method for detecting the concentration and rate of silver ions released during the dissolution of nano-silver
  • A method for detecting the concentration and rate of silver ions released during the dissolution of nano-silver
  • A method for detecting the concentration and rate of silver ions released during the dissolution of nano-silver

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Experimental program
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Embodiment 1

[0062] A method for detecting the concentration and rate of releasing silver ions during the dissolving process of nano-silver, comprising:

[0063] Step 10) Centrifuge the nano-silver colloid solution coated with sodium citrate and redissolve it to remove the existing silver ions in the solution. Specifically: take 1 mL of nano-silver colloid solution coated with spherical sodium citrate, centrifuge at room temperature and 7000 rcf for 15 minutes, then remove the supernatant; then redissolve the obtained precipitate to 9.9 mL with a mass concentration of 0.08% in the sodium citrate solution.

[0064] Step 20) After reconstitution, centrifuge for a short time and quickly mix it with Raman labeled molecules. Specifically: after the solution obtained in step 10) is ultrasonicated for 30 seconds, it is mixed with 0.1 mL molar concentration of 10 -3 mol / L Raman labeled molecule (Nile Blue A) solution was mixed.

[0065] Step 30) taking the sample solution to be tested obtained ...

Embodiment 2

[0077] A method for detecting the concentration and rate of releasing silver ions during the dissolving process of nano-silver, comprising:

[0078]Step 10) Centrifuge the nano-silver colloid solution coated with sodium citrate and redissolve it to remove the existing silver ions in the solution. Specifically: take 1 mL of silver nanoparticle colloid solution coated with spherical sodium citrate, centrifuge at room temperature and 7000 rcf for 18 minutes, then remove the supernatant; then redissolve the obtained precipitate to 9.9 mL with a mass concentration of 0.05 % sodium citrate solution.

[0079] Step 20) After reconstitution, centrifuge for a short time and quickly mix it with Raman labeled molecules. Specifically: after the solution obtained in step 10) is ultrasonicated for 20 seconds, it is mixed with 0.1 mL molar concentration of 10 -3 mol / L Raman marker molecule (Nile blue A) solution mixed, the sample solution to be tested obtained

[0080] Step 30) taking the ...

Embodiment 3

[0092] A method for detecting the concentration and rate of releasing silver ions during the dissolving process of nano-silver, comprising:

[0093] Step 10) Centrifuge the nano-silver colloid solution coated with sodium citrate and redissolve it to remove the existing silver ions in the solution. Specifically: take 1 mL of the silver nanoparticle colloid solution coated with sodium citrate, centrifuge at room temperature and 7000 rcf for 20 minutes, and then remove the supernatant. The obtained precipitate was redissolved in 9.9 mL of 0.1% sodium citrate solution.

[0094] Step 20) After reconstitution, centrifuge for a short time and quickly mix it with Raman labeled molecules. Specifically: after the solution obtained in step 10) is ultrasonicated for 100 seconds, it is mixed with 0.1 mL molar concentration of 10 -3 mol / L Raman labeling molecule (Nile Blue A) solutions were mixed to obtain a sample solution to be tested.

[0095] Step 30) taking the sample solution to be...

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Abstract

The invention discloses a method for detecting the concentration and a speed of silver ions released in the nano-silver dissolution process. According to the method, step 10), a nano-silver colloidal solution coated with sodium citrate is centrifuged and redissolved, and existing silver ions in the solution are removed; step 20), the nano-silver colloidal solution without the silver ions is mixed with a Raman labeled molecule solution, and a to-be-detected sample solution is obtained; the volume rate of the nano-silver colloidal solution coated with sodium citrate to the to-be-detected sample solution is 1:10; step 30), the to-be-detected sample solution is taken and put in a closed quartz colorimetric dish, and a microscopy Raman platform is used for Raman testing; step 40), Raman data obtained in the step 30) are subjected to baseline correction, curve fitting and data processing, and the changing curve of the concentration of the silver ions released by silver nanoparticles along with time and the changing curve of the release speed of the silver ions along with time are obtained by the aid of mathematic plotting software. The content of the silver ions released in the dissolution process of nano-silver can be continuously detected with the detection method.

Description

technical field [0001] The invention relates to a method for detecting the concentration and rate of silver ions, in particular to a method for detecting the concentration and rate of silver ions released during the dissolving process of nano-silver. Background technique [0002] When a beam of light interacts with an object, there are a very small number of photons in the scattered light that are different in frequency from the incident light. These photons are called Raman scattered light, and this phenomenon is called Raman scattering phenomenon. The same substance, irradiated with incident light of different frequencies, produces different Raman scattered light, but the difference between the frequency of Raman scattered photons and the frequency of incident photons, that is, the Raman shift, is the same, and it is related to the corresponding vibrational excited state and Corresponds to the energy level difference of the vibrational ground state. In short, the Raman s...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): G01N21/65
Inventor 顾宁邹捷萌柏婷婷郭志睿
Owner SOUTHEAST UNIV
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