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A superparamagnetic Fe 3 o 4 -pamam-tio 2 Preparation method of core-shell structured nanoparticle photocatalyst

A technology of fe3o4-pamam-tio2 and nanoparticles, applied in the direction of organic compound/hydride/coordination complex catalysts, physical/chemical process catalysts, chemical instruments and methods, etc., can solve the problem of specific surface area reduction and magnetic particle dispersion In order to achieve the effects of slowing down oxidation and dissolution, reducing direct contact, and avoiding high-temperature aggregation

Inactive Publication Date: 2019-11-01
SHANDONG UNIV OF TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

However, the heat treatment process 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
In addition, due to the bridging effect of linear polymers, the magnetic cores are prone to aggregation during the coating process, which increases the particle size and increases the hydrophobicity of the particle surface. After ultrasonic oscillation and grinding, the dispersion of the magnetic particles remains significantly decreased; and, polymers and inorganic minerals have completely different crystal structures, 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 monodisperse, magnetically supported photocatalyst with a complete core-shell structure

Method used

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  • A superparamagnetic Fe <sub>3</sub> o <sub>4</sub> -pamam-tio <sub>2</sub> Preparation method of core-shell structured nanoparticle photocatalyst

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Embodiment 1

[0021] Step (1): Superparamagnetic Fe 3 o 4 -Preparation of PAMAM nanoparticle colloidal solution: to a concentration of 1×10 -5 The 6th generation PAMAM dendrimer aqueous solution whose mol / L end group is hydroxyl is fed with nitrogen gas and mechanically stirred for 60 minutes, then the iron salt mixture is added, and the concentration of ferric chloride in the iron salt mixture is 1 mol / L , the concentration ratio of ferric chloride to ferric chloride is 2, and the addition amount of ferric salt mixture is Fe 3+ The ratio of substance to PAMAM dendrimers is 200:1 as the standard, and nitrogen gas is introduced at room temperature and stirred for 8 hours, then the temperature of the water bath is adjusted to 70°C, the stirring speed is increased to above 800 rpm, and the dropwise concentration is 1 ×10 -3 mol / L sodium hydroxide aqueous solution to pH 12, and continued stirring for 60 min to obtain superparamagnetic Fe 3 o 4 - PAMAM nanoparticle colloidal solution.

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Embodiment 2

[0026] Step (1): Superparamagnetic Fe 3 o 4 -Preparation of PAMAM nanoparticle colloidal solution: to a concentration of 1×10 -5 mol / L end group is the 6th generation PAMAM dendrimer aqueous solution of ester group, feeds nitrogen into the aqueous solution and mechanically stirs for 40 minutes, then adds the iron salt mixed solution, and the iron trichloride concentration in the iron salt mixed solution is 1 mol / L L, the concentration ratio of ferric trichloride and ferric chloride is 2, the addition amount of ferric salt mixture is Fe 3+ The ratio of substance to PAMAM dendrimers is 120:1 as the standard, and nitrogen gas is introduced at room temperature and stirred for 6 hours, then the temperature of the water bath is adjusted to 80°C, the stirring speed is increased to above 800 rpm, and the concentration of dripping is 1 ×10 -2 mol / L sodium hydroxide aqueous solution to a pH of 11, and continued stirring for 50 min to obtain superparamagnetic Fe 3 o 4 - PAMAM nanop...

Embodiment 3

[0031] Step (1): Superparamagnetic Fe 3 o 4 -Preparation of PAMAM nanoparticle colloidal solution: to a concentration of 1×10 -4 The 5th generation PAMAM dendrimer aqueous solution whose mol / L end group is a carboxyl group is fed with nitrogen gas and mechanically stirred for 30 minutes, then the iron salt mixture is added, and the concentration of ferric chloride in the iron salt mixture is 1 mol / L , the concentration ratio of ferric chloride and ferric chloride is 1.5, and the addition amount of ferric salt mixture is Fe 3+ The ratio of substance to PAMAM dendrimers is 80:1 as the standard, nitrogen gas is introduced at room temperature and stirred for 5 hours, then the temperature of the water bath is adjusted to 90°C, the stirring speed is increased to above 800 rpm, and the concentration of dripping is 1 ×10 -3 mol / L sodium hydroxide aqueous solution to a pH of 11, and continued stirring for 40 min to obtain superparamagnetic Fe 3 o 4 - PAMAM nanoparticle colloidal ...

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Abstract

The invention relates to a method for preparing a superparamagnetic Fe in a low-temperature aqueous solution using polyamide-amine (PAMAM) dendrimers as a template and an isolation layer. 3 o 4 ‑PAMAM‑TiO 2 A method for core‑shell structured nanoparticle photocatalysts. It is characterized in that: firstly, using PAMAM dendrimers as templates, the superparamagnetic Fe 3 o 4 ‑PAMAM nanoparticle colloidal solution; PAMAM dendrimers with different terminal groups are added to Fe 3 o 4 ‑PAMAM nanoparticles are coated to form a dendritic molecular isolation layer; finally, TiCl is added dropwise 4 Anhydrous ethanol solution, through atmospheric pressure reaction and hydrothermal reaction, to obtain a complete TiO 2 Shell Fe 3 o 4 ‑PAMAM‑TiO 2 Core‑shell nanoparticles; after washing and redispersion, superparamagnetic Fe 3 o 4 ‑PAMAM‑TiO 2 Core-shell structured nanoparticle photocatalysts.

Description

technical field [0001] The invention relates to a superparamagnetic Fe 3 o 4 -PAMAM-TiO 2 The invention discloses a method for preparing a core-shell structure nano particle photocatalyst, belonging to the technical field of material preparation. Background technique [0002] With the development of modern industry, waste and residual chemical substances have caused serious threats to the environment and ecological safety, and people have to find effective ways to deal with these organic wastes. 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 on how to effectively degrade various organic pollutants in water and air. . Nano-TiO 2 It has excellent photocatalytic activity, is cheap and non-toxic, has a band gap of 3.2eV, and exhibits excellent catalytic activity under ultraviolet light irradiation, and is considere...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): B01J31/38
Inventor 丛日敏于怀清杨思一
Owner SHANDONG UNIV OF TECH
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