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In order to solve the difficulty of separation and recycling of TiO 2  and its lower utilization of solar radiation, a new type of TiO 2  photocatalyst, which was sensitized by polypyrrole (PPy) and carried by self-made modified Fe 3 O 4 , named PPy-TiO 2 /M-Fe 3 O 4 , was fabricated successfully by combining suspension dispersion and  in situ  polymerization. The structure of photocatalyst and Fe 3 O 4  was characterized using X-ray diffraction, the Fourier transmission infrared spectrometer, and scanning electron microscopy. Light response property was tested by ultraviolet-visible diffuse reflectance spectra. Photocatalytic activity was evaluated with methyl orange as the degradation substance under different light radiation. Magnetic recovery property was investigated by using vibrating sample magnetometer and gravimetric analysis methods. The results showed that due to sensitization of PPy, the light response scope of PPy-TiO 2 /M-Fe 3 O 4  was broadened to 451 nm and the degradation rate of methyl orange had been increased by 32.5% under the same conditions. Meanwhile, the recovery rate of PPy-TiO 2 /M-Fe 3 O 4  remained above 97.9% after five cycles.

Synthesis of magnetic photocatalyst and sensitization properties of polypyrrole