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Preparation method and applications of ferriferrous oxide-polyaniline-gold nano composite material

A technology of nanocomposite material and ferric tetroxide, applied in the field of preparation of nanocomposite materials, can solve the problems of operating cost, reaction conditions, high equipment requirements, ineffective degradation, slow degradation speed, etc. The effect of reducing operating costs and fast degradation

Inactive Publication Date: 2015-10-14
TIANJIN UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Although the above method has a certain effect on the removal of 4-NP, it has limitations, such as ineffective degradation, slow degradation rate and secondary pollution, etc.
In addition, there are higher requirements for operating costs, reaction conditions, equipment, etc.

Method used

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  • Preparation method and applications of ferriferrous oxide-polyaniline-gold nano composite material
  • Preparation method and applications of ferriferrous oxide-polyaniline-gold nano composite material
  • Preparation method and applications of ferriferrous oxide-polyaniline-gold nano composite material

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0035] Step 1: Preparation of Fe with a particle size of 200-350 nm by solvothermal method 3 o 4 Nanoparticles, the steps are as follows: 1gFeCl 3 ·6H 2 O and 0.4g of trisodium citrate were added to 30mL of ethylene glycol, after the dissolution was complete, 2.4g of anhydrous sodium acetate was added under stirring, and after stirring for 30min, the mixed solution was transferred to a 50mL polytetrafluoroethylene autoclave. The reactor was reacted in a thermostat at 200° C. for 9 h. After the reaction, cool naturally to room temperature and separate with a magnet to obtain black Fe 3 o 4 Nanoparticles were washed 3 times with distilled water and absolute ethanol respectively, and dried in vacuum for later use;

[0036] Step 2: Preparation of Fe 3 o 4 -PANI core-shell structure composite material: take the Fe prepared in step 1 3 o 4 Dissolve 0.2 g of nanoparticles in 200 mL of water, stir evenly, add 0.2 g of PVP, stir and sonicate for 30 minutes to prepare a mixed s...

Embodiment 2

[0045] Compared with Example 1, the difference is only that step 2 prepares Fe 3 o 4 -PANI core-shell structure composite material, namely: take the Fe that step 1 makes 3 o 4 Dissolve 0.2 g of nanoparticles in 200 mL of water, stir evenly, add 0.2 g of PVP, stir and sonicate for 30 minutes, and stir the mixed solution at room temperature for 3 hours. Then add 0.2g of aniline monomer and 1g of citric acid in sequence, stir and sonicate for 15min. After stirring for 10 minutes in an ice bath, 0.5 g of ammonium peroxodisulfate (APS) was added, stirred for 9 hours in an ice bath, and the product was repeatedly washed with distilled water and absolute ethanol.

[0046] Because, compared with embodiment 1, embodiment 2 increases the amount of aniline monomer, so that the polyaniline layer coated on the surface of ferric oxide becomes thicker, which can be compared Figure 4 and Figure 5 Fe 3 o 4 -The partial enlarged figure of PANI draws, can obviously find out Fe in embodi...

Embodiment 3

[0048] Compared with Example 1, the only difference is that in Step 8, Step 7 is repeated 3 times.

[0049] Compared with Example 1, Example 3 increased the number of repetitions of step 7, so that the reduction reaction occurred many times, so the final obtained Fe 3 o 4 -PANI-Au II The loading of gold on the surface of the nanocomposite increases, and the gold shell becomes denser. Figure 8 and Figure 7 The comparison chart is consistent with the results.

[0050] Figure 9 It is the UV-vis figure of the catalyzed p-nitrophenol obtained in Example 3 of the present invention. It can be seen from the figure that the composite material prepared by the present invention has the characteristics of sensitivity and rapidity in catalyzing p-nitrophenol.

[0051] Figure 10 For the Fe that the embodiment of the present invention 3 obtains 3 o 4 -PANI-Au II (black) and Fe 3 o 4 -PANI-Au I (twill) Reuse times map. The figure illustrates that encapsulating the gold shell...

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Abstract

The invention discloses a preparation method a ferriferrous oxide-polyaniline-gold nano composite material. According to the preparation method, nano Fe3O4 is synthesized via solvothermal method, and is taken as the core of the composite material; Fe3O4 is uniformly dispersed into a PVP aqueous solution; aniline monomer, citric acid, and initiator ammonium peroxydisulfate are added respectively under ice bath and continuous stirring so as to form polyaniline on the surface of nano Fe3O4 from aniline via polymerization, and obtain a Fe3O4-PANI core-shell structure composite material; assembling of prepared gold nanosol with Fe3O4-PANI is realized via electrostatic attraction; and finally seed-mediated growth is adopted, and gold shell is prepared from gold seed with methanol and a reductive gold salt solution so as to obtain the ferriferrous oxide-polyaniline-gold nano composite material. The preparation method of ferriferrous oxide-polyaniline-gold nano composite material is low in cost, simple in technology, and excellent in performance; and the ferriferrous oxide-polyaniline-gold nano composite material is sensitive and rapid, and can be recycled in catalyzing pollutant p-nitrophenol.

Description

technical field [0001] The invention relates to a preparation method and application of a nanocomposite material that rapidly catalyzes p-nitrophenol Background technique [0002] In recent years, the pollution of phenol and phenolic compounds to water bodies has aroused widespread concern, and my country has listed it as one of the pollutants that need priority control in water. Among them, p-nitrophenol (4-NP) is a class of highly toxic, refractory, and most difficult to treat compounds. Therefore, the purification of wastewater containing phenols and aromatic hydrocarbons is a technical problem in my country and the world. The reduction product of 4-NP, p-aminophenol (4-AP), has relatively low toxicity and is an important chemical and pharmaceutical intermediate. The conversion of 4-NP to 4-AP can not only realize the degradation of 4-NP, but also effectively produce 4-AP. At present, commonly used 4-NP removal methods include: adsorption, microbial degradation, photoca...

Claims

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Application Information

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IPC IPC(8): B01J31/28C02F1/30C02F101/38
Inventor 李方陈东升薛涛
Owner TIANJIN UNIV
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