Highlight► The catalysts composite TiO 2 /MgZnAl-5, was more efficient than TiO 2 P25.► The effects of different molar ratios zinc on the photocatalysts were investigated.► Synergistic effect between constituents of TiO 2 /MgZnAl-5 increases the photocatalysis.► TiO 2 /MgZnAl-5 exhibited the adsorption of light displacing the greater wavelength.► The catalyst composite TiO 2 /MgZnAl-5 can be reused for five consecutive cycles.
AbstractPage 2 of 34 A c c e p t e d M a n u s c r i p t 2 A series of TiO 2 /MgZnAl photocatalysts, were successfully synthesized from ternary (Mg, Zn and Al) layered double hydroxides impregnated with TiO 2 nanoparticles by the co-precipitation method at variable pH with different Zn 2+ /Mg 2+ molar ratios . The composite photocatalysts were calcined at 500 °C resulting in the incorporation of oxide zinc, in the calcined MgZnAl LDH structure. Synergistic effect between ZnO and TiO 2 lead to significant enhancement of TiO 2 /MgZnAl photocatalytic activity. Composite photocatalysts were characterized by ICP-MS, N 2 adsorption/desorption, XRD, SEM, EDS, IR and UV-Vis DRS. Phenol in aqueous solution (50 mg/L) was used as a model compound for evoluation of UV-Vis (filter cutoff for λ > 300 nm) photocatalytic activity . The most efficient phocatalyst composite was obtained at a 5% Zn 2+ /Mg 2+ molar ratio , in the catalyst identified as TiO 2 /MgZnAl-5. This composite catalyst had high photocatalytic activity, completely destroying phenol and removing 80% of total organic carbon in solution after 360 min.The TiO 2 /MgZnAl-5 catalyst remained relatively stable, presenting a 15% decrease in phenol degradation efficiency after five consecutive photocatalytic cycles.
The new magnetic photocatalysts HT/TiO2/Fe and HT-DS/TiO2/Fe, modified with the anionic surfactant sodium dodecylsulfate (DS) were successfully synthesized in this work. Titanium dioxide (anatase) followed by iron oxide were deposited on the hydrotalcite support. Several catalyst samples were prepared with different amounts of titanium and iron. The photocatalysts were characterized by infrared and Raman spectroscopy, X-ray diffraction, scanning electron microscopy. Photocatalytic performance was analyzed by UV-visible radiation (filter cutoff, λ > 300 nm) of an aqueous solution (24 mg/L) of methylene blue (MB). The most efficient catalyst was obtained at an iron oxide:TiO2 molar ratio of 2:3. This catalyst showed high photocatalytic activity, removing 96% of the color and 61% of total organic carbon from the MB solution after 120 min. It was easily removed from solution after use because of its magnetic properties. The reuse of the HT-DS/TiO2/Fe23 catalyst was viable and the catalyst was structurally stable for at least four consecutive photocatalytic cycles.
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