Abstract
The heterostructures of three-dimensional CdS urchin-like microspheres separately decorated with hematite α-Fe2O3 or magnetite Fe3O4 nanoparticles were successfully synthesized via a two-step solvothermal deposition. Each CdS urchin-like microspheres had an average diameter of 2μm, which was composed of nanorods with average diameters of 10nm. α-Fe2O3 and Fe3O4 nanoparticles, with diameters of about 20nm and 30nm, respectively, anchored on the nanorods of CdS urchins. The photoluminescence behaviors of CdS urchins were conserved in both CdS/α-Fe2O3 and CdS/Fe3O4 heteronanostructures, and CdS/Fe3O4 heteronanostructure displayed ferromagnetic properties of the Fe3O4 nanoparticles, which makes it easily magnetically separated from the dispersion after photocatalysis and hence reused. Furthermore, the CdS/α-Fe2O3 heteronanostructure exhibited superior photocatalytic performances under visible light irradiation over pure CdS urchins and both the heteronanostructures showed improved photocatalytic recycled activities.
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