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Magnetically-responsive loaded Janus hierarchical-pore SiO2 composite microspheres and preparation method thereof

A magnetically responsive, composite microsphere technology, applied in the field of multifunctional materials, can solve the problems of high-efficiency preparation of materials and hindered application, and achieve the effect of interface catalytic degradation, high dispersion and loading, and green process

Active Publication Date: 2018-04-20
SHAANXI NORMAL UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

However, under acidic conditions due to Fe 3 o 4 A certain degree of reaction will occur, so there is no report on the successful preparation of magnetic materials by the emulsion method under acidic conditions, which leads to the high-efficiency preparation and application of some materials.
At the same time, in order to realize the greening, simplification and high efficiency of the preparation process, the use of unmodified Fe 3 o 4 Preparation of magnetic materials from particle emulsion systems is still a challenge

Method used

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  • Magnetically-responsive loaded Janus hierarchical-pore SiO2 composite microspheres and preparation method thereof
  • Magnetically-responsive loaded Janus hierarchical-pore SiO2 composite microspheres and preparation method thereof
  • Magnetically-responsive loaded Janus hierarchical-pore SiO2 composite microspheres and preparation method thereof

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Experimental program
Comparison scheme
Effect test

Embodiment 1

[0036] 1. Add 75mg Fe 3 o 4 Nanoparticles (particle size 2-50nm) are ultrasonically dispersed in 15mL of distilled water with pH=1, then take 9mL of the dispersion and add it to 1mL of vinyltriethoxysilane solution containing 0.15g of small molecule stabilizer, and stir evenly , the resulting mixed solution was placed on top of ammonia water with a mass concentration of 25% and left to react for 24 hours at room temperature to form a brown floc, which was centrifuged, washed with tetrahydrofuran, and dried at 80°C to obtain magnetic hierarchical pores with C=C double bonds on the surface SiO 2 microspheres, denoted as hierarchically porous SiO 2 @Fe 3 o 4 Microspheres. Depend on figure 1 It can be seen that the obtained sample is spherical and has obvious porous structure. Depend on figure 2 It can be seen that the microsphere responds to the external magnetic field.

[0037] 2. Mix 50mL of an aqueous solution containing 2g of cysteine ​​hydrochloride with 20mL of an...

Embodiment 2

[0042] 1. Add 75mg Fe 3 o 4 Nanoparticles (particle size 2-50nm) are ultrasonically dispersed in 15mL of distilled water with pH=1, then take 9mL of the dispersion and add it to 1mL of vinyltriethoxysilane solution containing 0.20g of small molecule stabilizer, and stir evenly , the resulting mixed solution was placed on top of ammonia water with a mass concentration of 25% and left to react for 24 hours at room temperature to form a brown floc, which was centrifuged, washed with tetrahydrofuran, and dried at 80°C to obtain magnetic hierarchical pores with C=C double bonds on the surface SiO 2 microspheres, denoted as hierarchically porous SiO 2 @Fe 3 o 4 Microspheres.

[0043] 2. Mix 50mL of an aqueous solution containing 2g of cysteine ​​hydrochloride with 20mL of an ethanol solution containing 0.4g of benzoin dimethyl ether, and then add 0.2g of the hierarchically porous SiO obtained in step 1. 2 @Fe 3 o 4 Microspheres, mixed evenly, irradiated under ultraviolet lig...

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Abstract

The invention discloses magnetically-responsive loaded Janus hierarchical-pore SiO2 composite microspheres and a preparation method thereof. The magnetically-responsive loaded Janus hierarchical-poreSiO2 composite microspheres is obtained by uniformly dispersing Fe3O4 nanoparticles in hierarchical-pore passages of hierarchical-pore SiO2 with an emulsion method, and then loading active componentssuch as Au nanoparticles, Ag nanoparticles and the like into the hierarchical-pore passages thereof. In the process of preparing a magnetic porous material by the emulsion method, the Fe3O4 nanoparticles are not required to be modified, and under a condition of low pH, the Fe3O4 nanoparticles can be sufficiently dispersed into an emulsion system and effectively enter the pore passages of the hierarchical-pore SiO2, so that high dispersion and loading of the magnetic nanoparticles are achieved. The magnetically-responsive loaded Janus hierarchical-pore SiO2 composite microspheres can be used asa solid surfactant and a solid catalyst for stabilizing a Pickering emulsion formed by a contaminant-containing aqueous phase and a common organic solvent as an oil phase so as to achieve interfacialcatalytic degradation of contaminants, and can also be recycled.

Description

technical field [0001] The invention belongs to the technical field of multifunctional materials, in particular to a magnetically responsive loaded Janus multi-level porous SiO 2 Composite microsphere and its preparation method. Background technique [0002] Over the years, the research on the preparation of smart materials has attracted great interest in the field of science and technology. The reason is that such materials are stimuli responsive to changes in external conditions such as light, heat, electric field, magnetic field and chemical environment. As an important part of magnetically responsive materials, magnetic nanoparticles can be easily separated from multiphase or complex systems with the help of external magnetic fields without adding chemical components (without changing the properties of the system itself). Therefore, the industrial application of magnetic nanoparticles is extremely wide, such as: new magneto-optical materials, recyclable catalysts, adsor...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): B01J13/14H01F1/00B01J23/89B01J35/10
CPCB01J13/14H01F1/0054B01J23/8906B01J35/33B01J35/60
Inventor 彭军霞李景芬曾龙龙杜冠群吕洁丽
Owner SHAANXI NORMAL UNIV
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