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| Hydrothermal synthesis of TiO2/PPY/Fe3O4 and its photocatalytic activity and magnetic recovery |
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Abstract Hard magnetic composite photocatalytic particles—titania (photoactive shell)/polypyrole (intermediate layer)/ ferroferric oxide (magnetic core) (TiO2/PPY/Fe3O4TPF) were prepared by hydrothermal methods. The prepared composite particles were characterized with X-ray diffraction (XRD), transmission electron microscopy (TEM), Fourier transform infrared spectroscopy (FT-IR), vibrating sample magnetometer (VSM) and Zetasizer. The photocatalytic activity of the catalysts were evaluated by photocatalytic degradation of phenol,and the magnetic recovery rate were studied by self-made recovery equipment. The results indicated that the samples were mix-crystal TiO2with anatase phase (95.2%) and rutile phase (4.8%), and its particle size was 4~7nm; PPY could promote TiO2loading on the surface of the magnetic core, as a result, TiO2was strongly loaded on the surface of PPY/ Fe3O4. The catalyst TPF with the mass ratio of TiO2:PPY:Fe3O4of 30:2.1:1exhibited good shell/shell/core structure and superparamagnetism, and its magnetic induction intensity was 40emu/g. The degradation of phenol followed psudo-first-order reaction kinetics and the reaction rate constants (K) of pure TiO2, P25, TPF were 0.0279, 0.0264, 0.0252, respectively, after recycling for 5times, the activity of TPF reduced a little (K=0.020), and the average recovery was 90.35%. The magnetic composite photocatalyst had high activity and magnetic recyclability, which showed good application foreground.
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Received: 18 October 2011
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