8.
Graphene oxide ‐ Fe
3O
4 ‐ NH
3+H
2PW
12O
40 ‐ magnetic nanocomposite (GO/Fe
3O
4/HPW) was prepared by linking amino ‐ functionalized Fe
3O
4 nanoparticles (Fe
3O
4 ‐ NH
2) on the graphene oxide (GO), and then grafting 12 ‐ tungstophosphoric acid (H
3PW
12O
40) on the graphene oxide ‐ magnetite hybrid (GO ‐ Fe
3O
4 ‐ NH
2). The obtained GO/Fe
3O
4/HPW nanocomposite was well characterized with different techniques such as FT ‐ IR, TEM, SEM, XRD, EDX, TGA ‐ DTA, AGFM, ICP and BET measurements. The used techniques showed that the graphene oxide layers were well prepared and the various stages of preparation of the GO/Fe
3O
4/HPW nanocomposites successfully completed. This new nanocomposite displayed excellent performance as a heterogeneous catalyst in the oxidation of alcohols with H
2O
2. The as ‐ prepared GO/Fe
3O
4/HPW catalyst was more stable and recyclable at least five times without significantly reducing its catalytic activity.
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