A new synthesis of a CoFe 2 O 4 -ZnS magnetic nanocomposite has been achieved and used as an efficient photocatalyst in the degradation of methyl orange in water under UV irradiation. The photocatalyst is magnetically recoverable from the reaction medium and suitable for multiple uses with sustained catalytic activity. Experimental section 2.1 Synthesis of CoFe 2 O 4 -ZnS nanocompositeInitially, a magnetic core of CoFe 2 O 4 NPs was prepared by ultrasonication-assisted co-precipitation and then a layer of

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A combined sonochemical co-precipitaion method has been developed for the synthesis of a CoFe(2)O(4)-Cr(2)O(3)-SiO(2) magnetic nanocomposite. The synthesis involved the pre-synthesis of CoFe(2)O(4)-Cr(2)O(3) nanoparticles, which were subsequently coated with SiO(2) by treatment with tetraethyl orthosilicate. It was observed that the as-prepared CoFe(2)O(4)-Cr(2)O(3)-SiO(2) nanocomposite exhibits photoluminescence properties without the addition of any external fluorescent marker. The fluorescent magnetic nanoparticles (FMNPs) had a typical diameter of 30 ± 5 nm and a saturation magnetization of 5.1 emu g(-1) at room temperature. This as-prepared nanocomposite was used for staining cultured HeLa cells for fluorescence imaging.