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Method for detecting cyanide ions based on gold nanorods

A technology of gold nanorods and cyanide ions, which is applied in the detection field of cyanide ions, can solve the problems of cumbersome reaction and secondary pollution, and achieve the effects of good stability, uniform size, and simple and convenient preparation process

Active Publication Date: 2016-08-10
YANCHENG INST OF TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, in the preparation process of the gold-core-silver-shell probe, it is necessary to wrap the silver shell on the surface of the gold core, the reaction is cumbersome, and formaldehyde is used, causing secondary pollution to the environment

Method used

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  • Method for detecting cyanide ions based on gold nanorods
  • Method for detecting cyanide ions based on gold nanorods
  • Method for detecting cyanide ions based on gold nanorods

Examples

Experimental program
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Effect test

Embodiment 1

[0024] Take 0.25mL of HAuCl with a concentration of 0.01M 4 Mix and stir the aqueous solution with 10mL cetyltrimethylammonium bromide aqueous solution with a concentration of 0.1M, quickly add 0.6mL freshly prepared 0.01M sodium borohydride ice water solution, stir for 2min, and stand at room temperature for 2h to obtain brown gold The nano seed solution is ready for use; take 40mL of cetyltrimethylammonium bromide aqueous solution with a concentration of 0.1M, and add 2.0mL of HAuCl with a concentration of 0.01M 4 aqueous solution and 0.25mL silver nitrate aqueous solution with a concentration of 0.01M, while adding a small amount of hydrochloric acid to adjust the pH to 1.5, after mixing thoroughly, add 0.32mL ascorbic acid with a concentration of 0.1M to the solution, and stir vigorously for 30s until the solution is colorless; finally, Add 0.1 mL of pre-prepared gold nano-seeding solution to the colorless solution, stir for 10 s, and leave the mixed solution at room tempe...

Embodiment 2

[0029] Take 0.25mL of HAuCl with a concentration of 0.01M 4 Mix and stir the aqueous solution with 10mL cetyltrimethylammonium bromide aqueous solution with a concentration of 0.1M, quickly add 0.6mL freshly prepared 0.01M sodium borohydride ice water solution, stir for 2min, and stand at room temperature for 2h to obtain brown gold The nano seed solution is ready for use; take 40mL of cetyltrimethylammonium bromide aqueous solution with a concentration of 0.1M, and add 2.0mL of HAuCl with a concentration of 0.01M 4 aqueous solution and 0.25mL silver nitrate aqueous solution with a concentration of 0.01M, while adding a small amount of hydrochloric acid to adjust the pH to 1.5, after mixing thoroughly, add 0.32mL ascorbic acid with a concentration of 0.1M to the solution, and stir vigorously for 30s until the solution is colorless; finally, Add 0.1 mL of pre-prepared gold nano-crystal seed solution to the colorless solution, stir for 10 s, and leave the mixed solution to stand...

Embodiment 3

[0034] The standard curve was obtained according to the method described in Example 1, except that the pH of the solution was changed to 1, and the aspect ratio of the obtained gold nanorods was 5:1.

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Abstract

The invention discloses a method for detecting cyanide ions based on gold nanorods, comprising the following steps: preparing gold nanorod solution, reacting the gold nanorod solution with a series of cyanide ion standard solutions, drawing a working curve through linear variations of ultraviolet absorption spectrum and / or two-photon excited fluorescent spectrum to obtain a linear equation with one unknown, measuring a sample by a corresponding scanning method, and taking a spectral value of the sample to the linear equation with one unknown for the standard working curve to calculate a sample concentration value. The preparation process of the gold nanorods is simple and convenient and is nontoxic and environment-friendly, the synthesized gold nanorods are uniform in size and good in stability and can react sensitively and quickly with cyanide ions in a water environment, cyanide ions in the water environment can be detected quickly and sensitively by using both ultraviolet spectrophotometry and two-photon excited fluorescence method, and lowest detection limit of ultraviolet spectrophotometry is up to 0.5 MuM, with lowest detection limit of the two-photon excited fluorescence method up to 0.01 MuM.

Description

technical field [0001] The invention relates to a method for detecting cyanide ions, in particular to a method for detecting changes in optical properties based on the reaction between gold nanorods and cyanide ions. Background technique [0002] The traditional methods for detecting cyanide ion include gas chromatography, electrochemical method and fluorescence method. Although these methods have high detection sensitivity and good reproducibility, the operation is cumbersome and requires expensive large-scale instruments and professional operators, making it difficult to achieve real-time and rapid detection of cyanide ions in water. Visual colorimetry is an important means to realize real-time and rapid detection of cyanide. The existing cyanide colorimetric method mainly uses the nucleophilic reaction between cyanide and organic receptors with conjugated systems and luminescent groups, so that the conjugated system of the organic receptors changes, and then produces a c...

Claims

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Application Information

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IPC IPC(8): G01N21/33G01N21/64G01N1/38
CPCG01N1/38G01N21/33G01N21/6402
Inventor 姜翠凤庞绍平李朝刘学然杨子润
Owner YANCHENG INST OF TECH
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