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The SnO2 spheres-like
nanoparticles have been successfully synthesized by a microwave
solvothermal method, in which SnCl2·2H2O,
poly(vinylpyrrolidone) PVP, H2O2 and NaOH as raw
materials. The as-synthesized products have been characterized by X-ray diffraction, scanning electron microscope, and
UV/Vis/NIR spectrophotometer. Photocatalytic activities of the samples have
been evaluated by the degradation of rhodamine B (RhB) under UV-light illumination.
Results showed that these products with diameter about 1 - 2 μm, and when the reaction time prolong, the surface of the SnO2 spheres will change to rough and then smooth when the time even longer. The
product with nanorods on its surface shows the higher photocatalytic activity
and red shift in the UV-vis absorption, which are relative to the unique
structure. At last we studied the electron transfer reactions during
photo-oxidation of RhB.