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Graphene-heme and nanogold ternary composite material, preparation method and application

A composite material and heme technology, applied in the field of graphene-heme and nano-gold ternary composite materials and preparation, can solve the problems of complex preparation steps, low efficiency, poor catalytic activity, etc., and achieve high degradation efficiency and cost. Low effect, simple preparation method

Inactive Publication Date: 2014-02-05
XIAMEN UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

It can be used as a peroxidase, but the efficiency is not high (Analytical chemistry, 1992, 64:517-522)
Gold nanoparticles have good biocompatibility and can be used as peroxidases, but their catalytic activity is poor (Chemical Communications, 2010, 46:8017-8019)
Any binary compound of the above three has a synergistic effect (Angewandte Chemie, 2012, 124: 3888-3891; Nanotechnology, 2007, 18: 265704; Advanced Materials, 2013, 25: 2594-2599), but the catalytic decomposition activity is still Not ideal, and the preparation steps are complicated, and the experiment is not easy to repeat, which also limits its use

Method used

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  • Graphene-heme and nanogold ternary composite material, preparation method and application
  • Graphene-heme and nanogold ternary composite material, preparation method and application
  • Graphene-heme and nanogold ternary composite material, preparation method and application

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Experimental program
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Effect test

Embodiment 1

[0028] Embodiment 1, the preparation of graphene-heme and nano-gold ternary composite material

[0029] Weigh 3g of natural graphite powder and 3g of sodium nitrate into a round bottom flask, mix well with 70mL of concentrated sulfuric acid in an ice bath, slowly add 9g of potassium permanganate in batches while stirring, and keep the temperature of the mixture below 20°C. After the potassium permanganate and the solution are fully mixed, transfer the above solution to an oil bath at 35±5°C for 30 minutes until a viscous mixture is formed. Then gradually add 140mL of pure water, and raise the temperature to 95±5°C to continue the reaction for 5h. Finally, 500 mL of pure water was added to terminate the reaction. At the same time, 20 mL of hydrogen peroxide solution with a mass fraction of 30% was added to remove unreacted potassium permanganate. At this time, the mixture changed from brown to bright yellow, and the above solution was cooled to room temperature. After suction ...

Embodiment 2

[0030] Embodiment 2, the characterization of graphene-heme and nano-gold ternary composite material

[0031] Get the ternary composite material solution 3mL of the above-mentioned prepared graphene-heme and nano-gold, and analyze it with an ultraviolet spectrophotometer, and the analysis results are shown in figure 1 . Take 10 μL of the ternary composite material and drop it on the copper grid for the analysis of transmission electron microscope (TEM) and energy spectrum (EDS). The results are shown in figure 2 and 4 . Take 100mL composite material solution and drop it on the silicon chip, carry out XRD analysis after drying, its result is shown in image 3 .

Embodiment 3

[0032] Embodiment 3, the high-efficiency enzyme performance description of graphene-heme and nano-gold ternary composite material

[0033] Prepare a TMB solution with a concentration of 100 μmol / L, a hydrogen peroxide solution with a concentration of 100 μmol / L, and a composite material dispersion with a concentration of 120 μg / mL, and then mix 100 μL, 200 μL, and 100 μL respectively, and finally carry out equal time intervals. Ultraviolet Spectrum Scanning. It can be known from the scanning curve that the TMB oxidation product has a characteristic absorption peak at 652nm. Figure 5 , so that we can use this absorption peak to monitor the decomposition rate of hydrogen peroxide, fix TMB, the concentration of hydrogen peroxide remains unchanged, use graphene-heme, nano gold, graphene-heme composite materials, graphene-nano Gold composite material, nano-gold-heme composite material instead of graphene-heme-nano-gold composite material can prove the high efficiency of this tern...

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Abstract

The invention discloses a graphene-heme and nanogold ternary composite material, a preparation method and an application, and relates to a hydrogen peroxide catalyst. The ternary composite material comprises the following components by percentage: 40-50 percent of graphene, 20-30 percent of heme and 20-40 percent of nanogold, wherein the total amount of the components is 100 percent. The preparation method comprises the following steps: adding sodium nitrate, sulfuric acid and potassium permanganate into graphite powder serving as a raw material, mixing and reacting until a thick mixture is formed; adding water into the mixture, continuously reacting, adding water and then ending the reaction to obtain a graphite oxide mixed liquid; adding a hydrogen peroxide solution, removing unreacted potassium permanganate, performing suction filtration, washing, centrifuging and drying to obtain the graphene oxide; mixing the obtained graphene oxide and the heme into an aqueous solution, heating, and filtering and drying the obtained solution to obtain the graphene-heme and nanogold ternary composite material; then dissolving in water, and adding chloroauric acid and ascorbic acid to obtain the product. The ternary composite material can be used as a hydrogen peroxide degradation reagent for degrading the hydrogen peroxide in the water.

Description

technical field [0001] The invention relates to a hydrogen peroxide catalyst, in particular to a graphene-heme and nano-gold ternary composite material, a preparation method and application thereof. Background technique [0002] h 2 o 2 As an important chemical product, it has multiple functions such as sterilization, bleaching, oxidation and disinfection. It is widely used. Therefore, the efficient catalytic decomposition of hydrogen peroxide is widely used in biopharmaceutical, food science, industrial analysis, environmental monitoring and clinical chemistry etc. are of great significance. Graphene is a two-dimensional single atomic layer material, sp 2 Carbon atoms are closely arranged in a honeycomb shape (Science, 2004, 306: 666-669; Nature Materials, 2007, 6: 183-191). It has a very large specific surface area (Nano Letters, 2008, 8: 3498-3502) and a central π-electron system (Nature, 2006, 442: 282-286). Heme is the main stable structure on the (hemoglobin) mole...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): B01J31/22B01J23/52B01J21/18C02F1/72
Inventor 翁建吕欣聪
Owner XIAMEN UNIV
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