Zeolite-supported TiO 2 and Fe-doped TiO 2 /zeolite photocatalysts were synthesized, aiming at improving the adsorption properties of the microporous support towards polluting dyes and the photocatalytic performance of TiO 2 in the treatment of the adsorbed organics. The TiO 2 /HY zeolite catalyst exhibited the best performance in the photocatalytic degradation of methylene blue, MB, over 10 wt% TiO 2 /HY under UV light at 254 nm. The addition of Fe species in the synthesis mixture led to Fe-TiO 2 /HY catalyst. The combination of adequate zeolite, good titanium dioxide dispersion, and Fe doping led to a remarkable performance in the degradation of the model dye. Over a 10 wt% Fe-doped TiO 2 /HY catalyst a total removal of MB (>98%) was achieved after 60 min under very mild conditions and simple visible light irradiation.
In the present study, three compositions of W-doped titania nano-photocatalyst are synthesized via the sol-gel method. The powders obtained were characterized by X-ray diffraction, Raman spectroscopy and UV-visible diffuse reflectance spectroscopy. The photocatalytic performances of the different photocatalysts are tested with respect to the degradation of Diuron in water solutions under simulated solar light and visible light irradiation. The WTiO catalyst exhibits better photoactivity than the pure TiO even under simulated solar light and visible light. This improvement in activity was attributed to photoelectron/hole separation efficiency.
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