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Preparation method and application of Au-Hg-rGO nano composite material

A technology of nanocomposite materials and gold nanoparticles, applied in the direction of nanocarbon, material electrochemical variables, graphene, etc., can solve the problems of insufficient detection minimum concentration and limited detection range, and achieve high friendliness and high sensitivity , The effect of simple preparation process

Inactive Publication Date: 2020-06-09
YANCHENG INST OF TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, the detection range is limited, and the minimum detection concentration has not been improved enough

Method used

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  • Preparation method and application of Au-Hg-rGO nano composite material
  • Preparation method and application of Au-Hg-rGO nano composite material
  • Preparation method and application of Au-Hg-rGO nano composite material

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0030] 1g of chloroauric acid powder was dissolved in a 100mL brown volumetric flask to obtain a chloroauric acid solution with a mass fraction of 1%, and a little citric acid-sodium citrate powder was weighed with an analytical balance to make a pH=5 buffer solution, and the chlorine Put 1mL of gold acid into 100mL of citric acid-sodium citrate buffer solution with a pH value of 5, stir and mix well, then quickly add 1mL of 10mg mL -1 Sodium borohydride (freshly prepared), then stirred for 4 hours to obtain gold nanoparticles. Then add the prepared gold nanoparticles into 100 μL of 1 mM mercury sulfate solution, stir for 30 minutes to obtain gold-mercury nanoparticles, put 10 mg of graphene oxide material into 10 mL of deionized water, and then sonicate for 1 hour to make the graphene The material is uniformly dispersed in deionized aqueous solution to obtain a suspension of graphene. Then take 10 mL of the above-mentioned gold-mercury nanoparticles and add them to the solut...

Embodiment 2

[0032] The Au-Hg / rGO nanocomposite material obtained in Example 1, acetic acid-sodium acetate, H 2 o 2 , TMB solution, the color changed from light brown to blue-green, proving that the nanocomposite can be used for H 2 o 2 detection.

[0033] Take 100 μL of the prepared Au-Hg / rGO nanoparticles and put them into a colorimetric tube, take out the acetic acid-sodium acetate with a pipette, prepare a buffer solution with pH=5, take 1.7 mL of it into the colorimetric tube, Slightly oscillate, let stand for a while, then add 100μL, 1mM TMB as a chromogenic substrate, then add 100μL, 1M H 2 o 2 , vibrate and shake well, and after 10 minutes of standing still, the color of the solution changes from light brown to blue-green, and its absorbance is measured.

Embodiment 3

[0034] XPS characterization of embodiment 3 Au-Hg / rGO nanocomposite

[0035] XPS was used to determine the surface composition of nanocomposites such as figure 1 shown. Depend on figure 1 (a) It can be seen that the characteristic peak of gold appears at 80-90eV, which proves that we have successfully prepared gold nanoparticles. from figure 1 (b) It can be seen that there is a characteristic peak of mercury at about 102eV, showing that the material contains metallic mercury, figure 1 (c) is the XPS spectrum of C element. figure 1 (d) is the XPS spectrum of O element. figure 1 (e) is the total spectrum of Au, C, Hg, and O elements. It can be seen from the XPS test results that we have successfully prepared Au-Hg / rGO nanocomposites.

[0036] TEM characterization of Au-Hg / rGO nanocomposites, the results are as follows figure 2 shown.

[0037] This picture is a TEM picture scanned under the condition of 100nm scale, by figure 2 We can see that the Au-Hg nanocomposite ...

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Abstract

The invention discloses a preparation method and application of an Au-Hg-rGO nano composite material. The preparation method comprises the following steps: preparing a chloroauric acid solution and acitric acid-sodium citrate buffer solution; uniformly mixing the chloroauric acid solution with a citric acid-sodium citrate buffer solution, quickly adding newly prepared sodium borohydride, and heating and stirring to obtain gold nanoparticles; adding a mercury sulfate solution into the gold nanoparticle solution, and stirring to obtain gold-mercury nanoparticles; putting graphene oxide into deionized water, and carrying out ultrasonic treatment for 1 hour to obtain a 1mg / mL graphene suspension; and adding gold-mercury nanoparticles into the graphene suspension, carrying out ultrasonic stirring and uniform mixing, then carrying out stirring with a magnetic stirrer, and carrying out ultraviolet irradiation for 1 to 3 h so as to obtain the Au-Hg / rGO nano composite material. The nano composite material has good catalytic performance on hydrogen peroxide, the linear range is 5-100 [mu] M, the detection limit is 3.25 [mu] M (S / N = 3), and the nano composite material has a good applicationprospect.

Description

technical field [0001] The invention relates to the field of nanocomposite materials, in particular to a preparation method and application of an Au-Hg-rGO nanocomposite material. Background technique [0002] Hydrogen peroxide (H 2 o 2 ) and water can be mixed in any proportion. Under the condition of low concentration, it can be used as a medical disinfectant, has oxidizing properties, and can also be used to remove a small amount of odor. and environmental engineering and many other fields play an important role. However, as an air pollutant, hydrogen peroxide is one of the formation factors of acid rain, and when the concentration is relatively high, it will bring some harm to the human body. At present, the methods for detecting hydrogen peroxide include titration, spectrophotometry, chemiluminescence, fluorescence measurement and electrochemical methods, but they all have their own shortcomings. How to detect hydrogen peroxide quickly and sensitively is worthwhile i...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): G01N27/26C01B32/184
CPCC01B32/184G01N27/26
Inventor 孔粉英姚磊王伟
Owner YANCHENG INST OF TECH
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