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Preparation of superparamagnetic Fe3O4-PAMAM-ZnO / TiO2 nanoparticles with core-shell composite structure

A technology of fe3o4-pamam-zno and nanoparticles, applied in organic compound/hydride/coordination complex catalysts, chemical/physical processes, special compound water treatment, etc., can solve crystal shell difficulties and increase particle size , the increase of hydrophobicity on the surface of the particles, etc., to avoid the decrease of the specific surface area, reduce the direct contact area, and the effect of simple and easy process

Inactive Publication Date: 2016-05-04
SHANDONG UNIV OF TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

The heat treatment process of preparing the inorganic isolation layer will oxidize the magnetic core and reduce the saturation magnetic susceptibility; make TiO 2 The specific surface area decreases and the number of active hydroxyl groups decreases, which reduces the recyclability and catalytic activity of the photocatalyst; the preparation of the linear polymer isolation layer does not require high heat treatment, but the bridging effect of the polymer will lead to the aggregation of the magnetic core during the coating process , the particle size increases, and the hydrophobicity of the particle surface increases. After ultrasonic vibration and grinding, the dispersion of magnetic particles is still significantly reduced; moreover, polymers and inorganic minerals have completely different crystal structures. Epitaxial growth of complete TiO 2 The crystal shell is very difficult, so it is difficult to obtain a monodisperse, magnetically supported photocatalyst with a complete core-shell structure

Method used

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  • Preparation of superparamagnetic Fe3O4-PAMAM-ZnO / TiO2 nanoparticles with core-shell composite structure

Examples

Experimental program
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Effect test

Embodiment 1

[0019] Step (1): The surface of Fe fully coated with PAMAM dendrimers 3 o 4 -Preparation of PAMAM nanoparticle colloidal solution: to a concentration of 1×10 -5 The mol / L end group of the 6th generation PAMAM dendrimer aqueous solution with ester group was fed with nitrogen gas and stirred for 30 minutes, then added the iron salt mixed solution, the concentration of ferric chloride in the iron salt mixed solution was 0.1mol / L, trichloro The ratio of the amount of substance of iron oxide and ferric chloride is 2, and the amount of ferric salt mixed solution is 120:1 as a standard with the ratio of the amount of substance of ferric iron and PAMAM dendrimers, and nitrogen gas is fed under room temperature and After mechanical stirring for 4 hours, the iron ions and the dendrimers are fully coordinated, then the temperature of the water bath is adjusted to 90°C, the stirring speed is increased to above 800r / min, and the aqueous sodium hydroxide solution with a concentration of 0....

Embodiment 2

[0022] Step (1): The surface of Fe fully coated with PAMAM dendrimers 3 o 4 -Preparation of PAMAM nanoparticle colloidal solution: to a concentration of 1×10 -5 The mol / L end group of the 6th generation PAMAM dendrimer aqueous solution with hydroxyl group was fed with nitrogen gas and stirred for 30 minutes, then the iron salt mixture was added, the concentration of ferric chloride in the iron salt mixture was 0.1mol / L, and the trichloride The ratio of the amount of iron to ferrous sulfate is 2, and the amount of the ferric salt mixture is based on the ratio of 100:1 to the ratio of ferric iron to PAMAM dendrimers. Nitrogen gas is introduced at room temperature and stirred mechanically. After 4 hours, fully coordinate the iron ions with the dendrimers, then adjust the temperature of the water bath to 90°C, increase the stirring speed to above 800r / min, and add dropwise an aqueous sodium hydroxide solution with a concentration of 0.1mol / L until the pH is 11. After continuous ...

Embodiment 3

[0025] Step (1): The surface of Fe fully coated with PAMAM dendrimers 3 o 4 -Preparation of PAMAM nanoparticle colloidal solution: to a concentration of 1×10 -5 The mol / L terminal group of the 5th generation PAMAM dendrimer aqueous solution with carboxyl group was fed with nitrogen gas and stirred for 30 minutes, then the iron salt mixture was added, the concentration of ferric chloride in the iron salt mixture was 0.1mol / L, and the trichloride The ratio of the amount of iron to ferrous sulfate is 2, and the amount of ferric salt mixture is based on the ratio of 60:1 to the ratio of ferric iron to PAMAM dendrimers. Nitrogen gas is introduced at room temperature and stirred mechanically. After 4 hours, fully coordinate the iron ions and the dendrimers, then adjust the temperature of the water bath to 80°C, increase the stirring speed to above 800r / min, and add dropwise an aqueous sodium hydroxide solution with a concentration of 0.1mol / L until the pH is 10. After continuous s...

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Abstract

The present invention relates to a method for preparing superparamagnetic Fe3O4-PAMAM-ZnO / TiO2 nanoparticles with a core-shell composite structure by using a polyamide-amine (PAMAM) dendrimer as a template and a spacer layer in a low temperature aqueous solution. The method is characterized by comprising the following steps: first preparing a superparamagnetic Fe3O4-PAMAM nanoparticle colloidal solution by using a PAMAM dendrimer as a template, then adding a right amount of PAMAM dendrimer to wrap the Fe3O4-PAMAM nanoparticles, under alkaline condition adding a solution of soluble zinc salt and a titanium tetrachloride solution at the same time; conducting atmospheric reaction and a hydrothermal reaction to obtain the superparamagnetic Fe3O4-PAMAM-ZnO / TiO2 nanoparticles with core-shell composite structure and with a complete ZnO / TiO2 composite shell layer. The particles can be dispersed in the form of individual particle in solution, and has high photocatalytic activity and magnetic recovery rate.

Description

technical field [0001] The invention relates to a superparamagnetic Fe 3 o 4 -PAMAM-ZnO / TiO 2 The invention discloses a method for preparing nanoparticles with a core-composite shell structure, belonging to the technical field of material preparation. Background technique [0002] The development of modern industry has improved the living standards of human beings, but industrial waste and residual chemical substances have caused serious threats to the environment and ecological security, making the living environment of human beings continue to deteriorate. Today, green development has become a national strategy, among which water treatment, air treatment and soil remediation technologies have become the focus of the development of the environmental protection industry. Photocatalysis is an advanced technology for degrading organic waste through oxidation reaction. It has achieved good results in oxidative degradation of azo dyes and pesticides. The current research focu...

Claims

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Application Information

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IPC IPC(8): B01J31/38B01J31/40C02F1/32
CPCC02F1/32B01J31/38B01J31/4084C02F2101/308C02F2305/10B01J35/50B01J35/39B01J35/40B01J35/33
Inventor 丛日敏于怀清张红松
Owner SHANDONG UNIV OF TECH
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