Facile and economic method for the preparation of core-shell magnetic mesoporous silica

Document Type: Research Article

Authors

1 Department of Chemical Engineering, School of Chemical and Petroleum Engineering, Shiraz University, Shiraz 7193616511, Iran

2 Institute for Applied Surfactant Research and School of Chemical, Biological & Materials Engineering, University of Oklahoma, Norman, Oklahoma 73019, United States.

Abstract

In this work core-shell structure Fe3O4@SiO2@meso-SiO2 microsphere has been successfully prepared. An inorganic magnetic core has been coated with multi-shell structure, dense nonporous silica as an inner layer and mesoporous silica as an outer layer. The dense silica shell can enhance the stability and minimize the negative effect of acidic condition on the inner core. And the porous outer shell can provide high surface area and enhance the loading of a functionalized group. Cetyltrimethylammonium bromide (CTAB) has been used as a pore-forming agent and a modified methodology was adopted to improve the extraction condition of this kind of surfactant. The as-prepared microspheres were characterized by field emission scanning electron microscope (FESEM), X-ray power diffraction (XRD), Fourier transform infrared spectroscopy (FTIR), vibration sample magnetometer(VSM), N2 adsorption-desorption, and particle size analyser (PSA). The resulted materials possessing uniform core-shell structure, and well preserved structural stability. Additionally, they can be collected readily by using an external magnetic field. The prepared material has considerable potential applications in various fields including catalysis, drug delivery, and water treatment.

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