To combine silica and magnetite to form a magnetic composite material become necessary to increase the surface area and the adsorptive properties of the material, due to the mesoporous nature of silicon oxide and to prevent the aggregation of iron oxide nano particles that always reduces it's surface area.
I think there are some papers could help you in your synthesis. Watch "experimental" or "synthesis"
Article Highly stable- silica encapsulating magnetite nanoparticles ...
Article Fe 3 O 4 /SiO 2 nanoparticles coated with polydopamine as a ...
Article Chainlike assembly of magnetite coated with SiO2 nanostructu...
you can use sol-gel method for this purpose and also you can use impregnation technique to improve your catalyst and limiting the aggregation.
You can refer few articles, may be helpful to you.
Article Synthesis of magnetite/silica nanocomposites from natural sa...
You will find a detailed and accurate description of the synthesis steps in this article.
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