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Nano TiO 2 /Fe 3 O 4 composite particles with different molar ratios of TiO 2 to Fe 3 O 4 were prepared via sol‐gel method. X‐ray diffraction, transmission electron microscopy, and vibration sample magnetometry were used to characterize the TiO 2 /Fe 3 O 4 particles. The photocatalytic activity of the particles was tested by degrading methyl blue solution under UV illumination (254 nm). The results indicate that with the content of TiO 2 increasing, the photocatalytic activity of the composite particles enhances, while the magnetism of the particles decreases. When the molar ratio of TiO 2 to Fe 3 O 4 is about 8, both the photocatalytic activity and magnetism of the TiO 2 /Fe 3 O 4 particles are relatively high, and their photocatalytic activity remains well after repeated use.
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Li et al. (2009) studied this question.
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