Method for high-sensitivity detection of mercury ions by using novel Au/C nano-composite sensor

A nano-composite, sensitive detection technology, applied in the measurement of color/spectral properties, material analysis by observing the influence of chemical indicators, and analysis by chemical reaction of materials, etc., can solve the problems of complicated detection and so on.

Pending Publication Date: 2022-05-13
QINGHAI UNIVERSITY
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  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

The instruments used are UV-2550 ultraviolet-visible spectrophotometer; AB204-S electronic analytical balance; PB-20 precision acid density meter; SHHW21-60 electric heating constant temperature water bath box, the detection is complicated

Method used

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  • Method for high-sensitivity detection of mercury ions by using novel Au/C nano-composite sensor
  • Method for high-sensitivity detection of mercury ions by using novel Au/C nano-composite sensor
  • Method for high-sensitivity detection of mercury ions by using novel Au/C nano-composite sensor

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Experimental program
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Effect test

Embodiment 1

[0025] The present invention comprises the following steps:

[0026] (1) Ultrasonic oscillation: weigh a certain amount of carboxylated carbon nanotubes, add absolute ethanol to them, and put the resulting solution into the ultrasonic machine for oscillation, so that the carboxylated carbon nanotubes are completely dispersed in absolute ethanol;

[0027] (2) Reduction: The dispersed solution is placed on a magnetic stirrer in step (1), and a chloral auremic acid solution and sodium borohydride solution are added to it, and the gold ions contained in the chloral argonic acid solution are reduced to gold nanoparticles to obtain Au / C nanoparticles;

[0028] (3) Detection: The prepared Au / C nanoparticles are ultrasonically dispersed to obtain an Au / C nanoparticle solution, and the cosmetic solution to be measured is added to the Au / C nanoparticle solution, and the color change of the Au / C nanoparticle solution is observed to determine whether the mercury ion to be measured is containe...

Embodiment 2

[0036] In the embodiment was prepared a buffer solution with a pH range of 2.6-12. Buffer solutions of different pHs are used to adjust the pH of the reaction system and select the pH that is most conducive to the reaction.

[0037] The steps are as follows: Add 70 μL of Au / C nanocomposite dispersion (1 mg / mL) with a gold content of 8% to the centrifuge tube, add 3780 μL of buffer with different pH, 40 μL of TMB ethanol solution (20 mM), 70 μL H 2 O 2 （2 M）、40 μLHgCl 2 Solution (0.1 mM). Shake at 35 °C with a thermostatic shock box for 10 min, after which the absorbance at 652 nm is measured with a spectrophotometer.

[0038] The results show that when the pH is 2.6-5.0, the absorbance of the solution rises, and when the pH = 5.0, the absorbance reaches the maximum value, indicating that the acidic conditions are more conducive to the reaction; when the pH is 5.0-7.0, the absorbance of the solution gradually decreases; when the pH is 8.0-12.0, the absorbance of the solution is bas...

Embodiment 3

[0040]In the present embodiment, the Au / C nanocomposites with gold content of 2%, 4%, 6%, 8%, 10% were set up as five experimental groups, and a group of pure carbon nanotubes was set up as a control group for experimental exploration.

[0041] The steps are as follows: Take 70 μL of dispersion (1 mg / mL) of Au / C nanocomposites with different gold content into the centrifuge tube, add 3780 μL of buffer pH=5.0, 40 μL of TMB ethanol solution (20 mM), 70 μL H 2 O 2 （2 M）、40 μLHgCl 2 Solution (0.1 mM). Shake at 35 °C with a thermostatic shock box for 10 min, after which the absorbance at 652 nm is measured with a spectrophotometer.

[0042] The results show that the absorbance of the pure carbon nanotubes in group 1 is the lowest, and the absorbance of the solutions in groups 2-6 is higher than that of group 1, and the absorbance of 5 experimental solutions is the highest, which is significantly higher than that of other groups. The experimental results show that the catalytic activi...

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Abstract

The invention belongs to the field of heavy metal ion detection, and particularly relates to a method for high-sensitivity detection of mercury ions by using a novel Au/C nano-composite sensor. Comprising the steps that a dispersion solution is prepared through ultrasonic concussion, a chloroauric acid solution and a sodium borohydride solution are added into the dispersion solution, gold ions contained in the chloroauric acid solution are reduced into gold nanoparticles, and Au/C nanoparticles are prepared; adding a to-be-detected cosmetic solution into the Au/C nanoparticle solution, judging whether the to-be-detected cosmetic solution contains mercury ions or not by observing the color change of the Au/C nanoparticle solution, and judging the content of the mercury ions by using a colorimetric method. The method has portability on mercury ion detection and is extremely important in household detection, the novel Au/C nano-composite sensor is constructed for colorimetric detection of mercury ions for the first time, and the detection line and the detection range are relatively low. The method for detecting the heavy metal element mercury ions is supplemented again, and certain practical significance is achieved.

Description

Technical field [0001] The present invention belongs to the field of heavy metal ion detection, specifically relates to a new Au / C nanocomposite sensor for mercury ion high sensitivity detection method. Background [0002] Mercury (Hg) is the only liquid metal at room temperature, which is very harmful to animals and the ecological environment. Because mercury can inhibit the formation of melanin in cells and has a certain degree of whitening effect, many cosmetics are added with a certain amount of mercury to enhance the use of cosmetics. The addition of mercury elements, although to improve the performance of cosmetics themselves, but the long-term accumulation of these substances, will have a serious impact on our health, and mercury elements will be enriched in the food chain, the harm caused to the organism and the environment can not be ignored. At present, there are many methods for detecting mercury in heavy metal elements, and the traditional methods are atomic absorp...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): G01N21/31G01N21/78
CPCG01N21/31G01N21/78
Inventor 陈冠瑾王玉儒陈梓元于淑曼许婷王蕙娇
Owner QINGHAI UNIVERSITY
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