Two magnetic core-shell type photocatalytic systems are presented: first, Zn0.35Ni0.65Fe2,O4-SiO2-TiO2, showed high activity in the photooxidation of oxalate, and the other, Fe3O4-Fe2O3-polyaniline: P2W18O62(6-), was tested in the reaction of SO2 photooxidation.
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