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Preparation method for Fe3O4-PAMAM-ZnO-TiO2 core-shell-shell-structured nanoparticles

A technology of fe3o4-pamam-zno-tio2 and nanoparticles, applied in chemical instruments and methods, organic compound/hydride/coordination complex catalysts, physical/chemical process catalysts, etc., can solve the problem of photocatalyst magnetic recovery performance and Reduced catalytic activity, difficulty in obtaining magnetically loaded photocatalysts, and difficulty in epitaxial growth of crystal shells, etc., to avoid the decline in specific surface area, reduce direct contact area, and avoid high-temperature roasting

Inactive Publication Date: 2016-04-20
SHANDONG UNIV OF TECH
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  • Abstract
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Problems solved by technology

However, the heat treatment process for preparing the inorganic spacer layer will oxidize the magnetic core, reduce the saturation magnetic susceptibility, and make the TiO 2 The specific surface area decreases, the number of active hydroxyl groups decreases, and the magnetic recovery performance and catalytic activity of the photocatalyst decrease
The preparation of the polymer isolation layer does not require high heat treatment, but the bridging effect of the linear 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 oscillation and grinding, the magnetic The dispersion of particles is still significantly reduced; and, polymers and inorganic minerals have completely different crystal structures, and epitaxial growth of complete TiO on the surface of hydrophobic polymers 2 The crystal shell is very difficult, so it is difficult to obtain a magnetically supported photocatalyst with a single particle dispersion and a complete core-shell structure

Method used

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  • Preparation method for Fe3O4-PAMAM-ZnO-TiO2 core-shell-shell-structured nanoparticles

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Experimental program
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Effect test

Embodiment 1

[0020] 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 ferric chloride and ferric chloride is 2, and the amount of ferric salt mixed solution is the ratio of the amount of substance of the 6 generation PAMAM dendrimer of the ester group with ferric iron and the initial terminal group added as 200:1 as the standard, nitrogen gas was introduced at room temperature and stirred mechanically for 4 hours to fully coordinate the iron ions and dendrimers, then adjust the temperature of the water bath to 90°C, and after the stirring speed increased to 800r / min, the d...

Embodiment 2

[0023] 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 ferric chloride and ferric chloride is 2, and the amount of ferric salt mixed solution is the ratio of the amount of substance of the 6 generation PAMAM dendrimer of the ester group with ferric iron and the initial terminal group added as The ratio of 120:1 is the standard. After nitrogen gas is introduced at room temperature and mechanically stirred for 4 hours, the iron ions and dendrimers are fully coordinated. Then the temperature of the water bath is adjusted to 90°C. After the stirring speed is inc...

Embodiment 3

[0026] 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 substance between iron and ferrous sulfate is 2, and the amount of ferric salt mixed solution is 80:1 with the ratio of the amount of substance of the 5th generation PAMAM dendrimer whose terminal group is initially added to the carboxyl group. As a standard, nitrogen gas was introduced at room temperature and mechanically stirred for 4 hours to fully coordinate the iron ions and dendrimers, then the temperature of the water bath was raised to 80°C, the stirring speed was raised to 800r / min, and the dropwise ...

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Abstract

The invention relates to a method for preparing paramagnetic Fe3O4-PAMAM-ZnO-TiO2 core-shell-shell-structured nanoparticles by taking polyamide-amine(PAMAM) dendrimers as a template and a separation layer in a low-temperature aqueous solution. The method is characterized in that firstly, the PAMAM dendrimers are firstly taken as the template, and a paramagnetic Fe3O4-PAMAM nanoparticle colloidal solution is prepared by adopting a coprecipitation method; secondly, the PAMAM dendrimers are added to wrap Fe3O4-PAMAM nanoparticles; thirdly, under the alkaline condition, soluble zinc salt is added to generate a ZnO shell layer; fourthly, a titanium tetrachloride solution is added to generate a TiO2 shell layer, and then the paramagnetic Fe3O4-PAMAM-ZnO-TiO2 core-shell-shell-structured nanoparticles with the complete ZnO shell layer and TiO2 shell layer are prepared. The nanoparticles can be dispersed into a solution in a single particle mode and have the higher photocatalytic activity and magnetic recovery rate.

Description

technical field [0001] The present invention relates to a kind of Fe 3 o 4 -PAMAM-ZnO-TiO 2 The invention discloses a method for preparing nanoparticles with a core-shell-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 focus is o...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): B01J31/38
CPCB01J31/38B01J35/396B01J35/23B01J35/39
Inventor 丛日敏于怀清王卫伟张红松
Owner SHANDONG UNIV OF TECH
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