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Fe3O4-poly-dopamine-Au nano-composite material as well as preparation method and application thereof

A nanocomposite material, polydopamine nanotechnology, applied in chemical instruments and methods, organic compound/hydride/coordination complex catalyst, color/spectral characteristic measurement, etc., can solve the problem of low catalyst utilization rate

Inactive Publication Date: 2015-01-07
QUFU NORMAL UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

At present, there are two problems in the use of nano-gold catalysts: firstly, the fixation and recycling of the catalyst; and the low utilization rate of the catalyst

Method used

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  • Fe3O4-poly-dopamine-Au nano-composite material as well as preparation method and application thereof
  • Fe3O4-poly-dopamine-Au nano-composite material as well as preparation method and application thereof
  • Fe3O4-poly-dopamine-Au nano-composite material as well as preparation method and application thereof

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preparation example Construction

[0023] The present invention also provides a kind of Fe 3 o 4 - Preparation of polydopamine-Au nanocomposites, see figure 1 , which includes the following steps:

[0024] Step 1: Fe with a diameter of 200-250 nm 3 o 4 Nano-magnetic beads are dispersed into a buffer solution with a pH of 8.5, and stirred, wherein the concentration of the buffer solution is maintained at 8-12 mmol / L;

[0025] Step 2: adding dopamine hydrochloride to the reaction system, and reacting for 3 to 24 hours to obtain the initial Fe 3 o 4 - polydopamine nanoparticles, wherein the Fe 3 o 4 The mass ratio of the nano magnetic beads to the dopamine hydrochloride is 1:0.8~1:1.2;

[0026] Step 3: the initial Fe 3 o 4 - the polydopamine nanoparticles are dispersed into the buffer solution with a pH of 8.5 again, and step 2 is repeated 1 to 2 times to obtain Fe 3 o 4 - polydopamine particles;

[0027] Step 4: the Fe 3 o 4 - Polydopamine particles are prepared into a dispersion with a mass concen...

Embodiment 1

[0035] 0.325g anhydrous FeCl 3 Disperse with 0.2g sodium citrate in 20mL ethylene glycol, stir for 1 hour to completely dissolve the solid; then add 1.2g sodium acetate and stir for 30 minutes. The mixture was added to a hydrothermal reaction kettle with a volume of 50 mL, put into an oven, and kept at 200° C. for 12 hours, and was taken out when the reaction kettle was cooled to room temperature. The black precipitate at the bottom of the reaction kettle is Fe 3 o 4 Nano-magnetic beads, using a magnet for magnetic separation, the obtained Fe 3 o 4 Wash with water and ethanol three times respectively, and dry under vacuum at 50°C for 12 hours. Weigh 40mg Fe 3 o 4 Nano-magnetic beads, dispersed into a Tris (10mmol / L) buffer solution with a pH of 8.5; add 40mg of dopamine under rapid stirring, and the dopamine can be 3 o 4 A thin film was formed on the surface of the nano-magnetic beads independently, and the mixture was stirred rapidly at room temperature for 8 hours. ...

Embodiment 2

[0037] Weigh 2 mg of Fe with different PDA thicknesses 3 o 4 -PDA nanoparticles were dispersed in 25mL deionized water, ultrasonicated for 5 minutes to form a uniform dispersion, and 75μL 1g / L HAuCl was added under rapid stirring 4 Aqueous solution, after reacting at 90°C for 30 minutes, HAuCl 4 Gold nanoparticles can be formed under the reducing action of dopamine. Then use a magnet to separate, wash with water three times, and dry in vacuum at 50°C for 12 hours to obtain Fe 3 o 4 - Polydopamine-Au nanocomposites.

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Abstract

The invention provides a Fe3O4-poly-dopamine-Au nano-composite material. Au nano-particles are deposited on the surfaces of Fe3O4 nano-magnetic beads covering poly-dopamine, wherein the diameter of the Au nano-particles is 10-30 nm; the thickness of poly-dopamine is 20-55 nm, and the diameter of Fe3O4 magnetic beads is 200-250 nm. The invention also provides a preparation method of the Fe3O4-poly-dopamine-Au nano-composite material and an application of the Fe3O4-poly-dopamine-Au nano-composite material in detection of catalysis of p-nitrophenol. According to the composite material, because nanogold is distributed on the surface layer of the Fe3O4-poly-dopamine-Au nano-composite material, the catalytic efficiency is improved; in addition, the Fe3O4 magnetic beads have the characteristics of high biocompatibility and environmental protection, and is convenient to synthesize and easy to separate, so that a nanogold catalyst can be repeatedly used.

Description

technical field [0001] The invention belongs to the field of nano new materials, in particular to a Fe 3 o 4 -Polydopamine-Au nanocomposite material and its preparation method and application. Background technique [0002] Composite nanomaterials are new-purpose materials obtained by coupling or synergistically recombining two or more substances with completely different physical and chemical properties. In addition to the properties of its own parts, the properties realized by it can also show many novel characteristics, breaking through the limitations of a single part's performance. Nanocomposite materials have significant application prospects in the research and development of new functional materials, biomedicine, environmental protection and pollution control. [0003] Due to its small size effect, surface effect, and controllable particle size, gold nanoparticles have been widely used in biomedical engineering, electronics, and catalytic engineering. Loading nano...

Claims

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Application Information

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IPC IPC(8): B01J31/28G01N21/33
Inventor 渠凤丽赵岩
Owner QUFU NORMAL UNIV
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