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Preparation method and application of Fe3O4@PPy@Au magnetic composite microspheres

A technology of magnetic composite microspheres and magnetic nanoparticles, applied in the field of environmental analysis, to achieve the effect of simple process, easy access to raw materials, and high dispersion

Inactive Publication Date: 2016-07-13
HENAN UNIVERSITY
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

Although there are not many "hot spots" in the general substrate, the enhancement provided is quite significant

Method used

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  • Preparation method and application of Fe3O4@PPy@Au magnetic composite microspheres
  • Preparation method and application of Fe3O4@PPy@Au magnetic composite microspheres
  • Preparation method and application of Fe3O4@PPy@Au magnetic composite microspheres

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Effect test

Embodiment 1

[0020] a kind of Fe 3 o 4 The preparation method of PPyAu magnetic composite microspheres comprises the following steps: (1) 1gFe 3 o 4 Disperse magnetic nanoparticles in 85ml of distilled water, add 0.7g of polyvinylpyrrolidone, stir evenly with ultrasonic, then add 3ml of pyrrole and 35ml of absolute ethanol, stir evenly, add 5ml of hydrochloric acid (12mol / L) to react for 20min, wash with distilled water after magnetic separation , get Fe 3 o 4 PPy magnetic composite microspheres; (2) the Fe prepared in step (1) 3 o 4 PPy magnetic composite microspheres were added to 1450ml24mmol / L chloroauric acid solution, ultrasonically dispersed evenly, then magnetically separated, washed with distilled water, and dried at 60°C to obtain Fe coated with chloroauric acid 3 o 4 PPy magnetic composite microspheres; (3) Fe coated with chloroauric acid obtained in step (2) 3 o 4 PPy magnetic composite microspheres were dispersed in 15L of distilled water, and 3L of NaBH with a concen...

Embodiment 2

[0024] a kind of Fe 3 o 4 The preparation method of PPyAu magnetic composite microspheres comprises the following steps: (1) 1gFe 3 o 4 Disperse magnetic nanoparticles in 50ml of distilled water, add 0.429g of polyvinylpyrrolidone, stir evenly with ultrasonic, then add 2ml of pyrrole and 30ml of absolute ethanol, stir evenly, add 7ml of hydrochloric acid (10mol / L) to react for 15min, wash with distilled water after magnetic separation , get Fe 3 o 4 PPy magnetic composite microspheres; (2) the Fe prepared in step (1) 3 o 4 Add PPy magnetic composite microspheres to 3500ml20mmol / L chloroauric acid solution, ultrasonically disperse evenly, then wash with distilled water after magnetic separation, and dry at 55°C to obtain Fe coated with chloroauric acid 3 o 4 PPy magnetic composite microspheres; (3) Fe coated with chloroauric acid obtained in step (2) 3 o 4 PPy magnetic composite microspheres were dispersed in 10L of distilled water, and 2.5L of NaBH with a concentratio...

Embodiment 3

[0028] a kind of Fe 3 o 4 The preparation method of PPyAu magnetic composite microspheres comprises the following steps: (1) 1gFe 3 o 4 Disperse magnetic nanoparticles in 90ml of distilled water, add 1.428g of polyvinylpyrrolidone, stir evenly with ultrasonic, then add 4ml of pyrrole and 40ml of absolute ethanol, stir evenly, add 3ml of hydrochloric acid (12mol / L) to react for 25min, wash with distilled water after magnetic separation , get Fe 3 o 4 PPy magnetic composite microspheres; (2) the Fe prepared in step (1) 3 o 4 Add PPy magnetic composite microspheres to 2500ml30mmol / L chloroauric acid solution, ultrasonically disperse evenly, then wash with distilled water after magnetic separation, and dry at 65°C to obtain Fe coated with chloroauric acid 3 o 4 PPy magnetic composite microspheres; (3) Fe coated with chloroauric acid obtained in step (2) 3 o 4 PPy magnetic composite microspheres were dispersed in 20L of distilled water, and 4.5L of NaBH with a concentratio...

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Abstract

The invention discloses a preparation method and an application of Fe3O4@PPy@Au magnetic composite microspheres. Fe3O4 nanoparticles are synthesized firstly and covered with PPy layers, then synthesis is controlled with a two-step method for seed growing, and accordingly, the surface coated particles are relatively complete; used raw materials are easily available, a process is simple, ultrasonic-assisted synthesis is used, and high dispersity of the composite microspheres is guaranteed; sizes of the Au particles on the surfaces are controlled very well by controlling potassium carbonate and ascorbic acid; the prepared Fe3O4@PPy@Au magnetic nanoparticles have magnetism of Fe3O4 and Raman enhancement performance of the nano-Au particles. The Fe3O4@PPy@Au magnetic nanoparticles are taken as an SERS (surface-enhanced Raman spectroscopy) substrate and dispersed in a crystal violet solution with certain concentration, crystal violet can be enabled to be adsorbed and enriched to the surfaces of the magnetic particles initiatively, and Raman characteristic peaks of the crystal violet can be detected within short time through SERS enhancement.

Description

technical field [0001] The invention belongs to the field of environmental analysis, in particular to a Fe 3 o 4 Preparation method and application of PPyAu magnetic composite microspheres. Background technique [0002] In recent years, the wanton use of pesticides has posed a serious threat to the ecological environment and human health. Pesticide residues enter water bodies and can accumulate in the human body, leading to endocrine disorders, reproductive and immune dysfunction, and even cancer, seriously threatening human health. At present, my country attaches great importance to the problem of excessive pesticide residues in water bodies. However, traditional methods such as chromatography / mass spectrometry require cumbersome processes such as extraction, concentration, and purification. Although trace pesticide residues can be detected, rapid detection cannot be achieved. Surface Raman Enhanced Resonance Spectroscopy (SERS) has become a potential pesticide residue an...

Claims

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Application Information

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IPC IPC(8): C08G73/06C08L79/04C08K3/22C08K3/08G01N21/65
CPCC08G73/0611C08K3/08C08K3/22C08K2003/0831C08K2003/2275C08K2201/011G01N21/658C08L79/04
Inventor 王永强郑海红虞勇程琳
Owner HENAN UNIVERSITY
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