Magnetic nano composite and preparation method and application thereof

A magnetic nano-composite technology, used in magnetic objects, magnetic materials, alkali metal compounds, etc., can solve the problems of incomplete conductive polymers and poor acid resistance, and achieve high magnetic responsiveness, high separation efficiency, and reusability. Good results

Active Publication Date: 2016-12-21
北京畅吸医疗器械有限公司
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  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0005] CN104324706A synthesized a class of conductive polymer-based magnetic nanocomposites (Fe 3 o 4 / PANI and Fe 3 o 4 / PPy), and use it for the selective adsorption of silver ions; however, the acid resistance of this type of magnetic nanocomposites is poor, which may be caused by the incomplete coating of the magnetic core by the conductive polymer, which limits the Application of this kind of magnetic nanocomposite in acidic solution

Method used

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  • Magnetic nano composite and preparation method and application thereof
  • Magnetic nano composite and preparation method and application thereof
  • Magnetic nano composite and preparation method and application thereof

Examples

Experimental program
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Effect test

Embodiment 1

[0065] A preparation method of a magnetic nanocomposite, the steps are as follows:

[0066] (1) Under the protection of nitrogen, add 9mmol ferric chloride hexahydrate, 5mmol ferrous sulfate heptahydrate and 120mL distilled water into a 250mL four-necked bottle, stir and dissolve at room temperature, raise the temperature of the solution to 50°C, and then add 3.3mL Concentrated ammonia water (28wt%), after the addition, the temperature of the solution was raised to 80°C, stirred for 1 hour, and cooled to room temperature to obtain solution A;

[0067] (2) Add 1.7mL tetraethyl orthosilicate to solution A, stir at room temperature for 4 hours; magnetically separate, keep the solid, wash the solid repeatedly with distilled water until the supernatant is neutral, magnetically separate, keep the solid, and place the solid in Dry in a vacuum oven at 40°C for 6 hours to obtain Fe 3 o 4 / SiO 2 ;

[0068] (3) Under nitrogen protection, add 0.6g Fe to a 250mL four-necked bottle 3 o...

Embodiment 2

[0072] A preparation method of a magnetic nanocomposite, the steps are as follows:

[0073] (1) Under the protection of argon, add 10mmol ferric nitrate nonahydrate, 5mmol ferrous sulfate heptahydrate and 67mL distilled water into a 250mL four-necked bottle, stir and dissolve at room temperature, raise the temperature of the solution to 60°C, and then add 5mL concentrated ammonia water (28wt%), after the addition, the temperature of the solution was raised to 90°C, stirred and reacted for 0.5h, and then lowered to room temperature to obtain solution A;

[0074] (2) Add 1.9mL methyl orthosilicate to solution A, stir at room temperature for 2 hours; magnetically separate, keep the solid, wash the solid repeatedly with distilled water until the supernatant is neutral, magnetically separate, keep the solid, and place the solid in Dry in a vacuum oven at 60°C for 4 hours to obtain Fe 3 o 4 / SiO 2 ;

[0075] (3) Under nitrogen protection, add 0.6g Fe to a 250mL four-necked bottl...

Embodiment 3

[0085] A magnetic nanocomposite is used for the selective separation of gold ions, the steps are as follows:

[0086](1) Take an appropriate amount of standard solutions of gold (III), magnesium (II), copper (II), zinc (II), arsenic (V), cadmium (II) and lead (II) respectively, mix them together, Prepare a mixed solution with a pH of 5 whose ion concentration is 90 mg / L, and divide the above mixed solution into 10 mL aliquots.

[0087] (2) Add 1, 2, 4, 8, 12, and 16 mg of magnetic nanocomposite sample S-1 to each equal portion of the mixed solution, and disperse evenly with ultrasonic waves, then place it in an oscillator and oscillate at room temperature for 2 hours. 100r / min, magnetic separation, the supernatant was taken for ICP-OES detection, and the adsorption amount of various ions was calculated.

[0088] (3) The magnetic adsorbent recovered after the adsorption separation is respectively placed in the mixed eluent of hydrochloric acid-thiourea (hydrochloric acid 5wt%,...

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Abstract

The invention provides a magnetic nano composite and a preparation method and an application thereof; the polymer-coated Fe3O4 / SiO2 magnetic nano composite has a multi-shell type structure, and Fe3O4 / SiO2 is dispersed in a pyrrole and thiophene copolymer substrate. The synthesis method comprises that a Fenton-like reagent (FeCl3+H2O2) is used as an oxidant, a chemical oxidation method is adopted, an aqueous solution is used as a reaction medium, and the novel pyrrole and thiophene copolymer-coated Fe3O4 / SiO2 magnetic nano composite Fe3O4 / SiO2 / cPPyTh is synthesized; the synthesis method is simple and environmentally friendly. The Fe3O4 / SiO2 / cPPyTh magnetic nano composite has the surface containing N and S, has the advantages of superparamagnetism, relatively high magnetic responsiveness, relatively large specific surface area and relatively good acid resistance, and has excellent adsorption performance and quite high selective separation efficiency on gold ions.

Description

technical field [0001] The invention relates to a magnetic nanocomposite and its preparation method and application, belonging to the technical field of magnetic nanocomposite materials and solid phase extraction materials preparation. Background technique [0002] As one of the precious metals, gold is widely used in the fields of catalysis, electronics, sensing, lithium battery and medicine (Chem.Soc.Rev.41(2012)2740–2779.); however, in the application process of gold, the Gold species leaked into the environment in the form of ions will not only cause a waste of gold resources, but also pose a threat to human health (Biochem. Biophys. Res. Commun. 397 (2010) 226–231.). In order to recover gold species from gold-bearing industrial wastewater, electronic waste, and metallurgical materials, various methods have been developed, such as liquid-liquid extraction, membrane separation, reduction-precipitation, ion exchange, and solid-phase extraction ( J. Mater. Chem. A3 (2015) ...

Claims

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Application Information

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IPC IPC(8): B01J20/26B01J20/28B01J20/30H01F1/00C22B7/00C22B11/02
CPCB01J20/0229B01J20/06B01J20/103B01J20/264B01J20/28009B01J20/28019C22B7/001C22B11/021H01F1/0018Y02P10/20
Inventor 盖利刚朱明英张伟班青
Owner 北京畅吸医疗器械有限公司
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