Effect of metal ion addition on structural characteristics and photocatalytic activity of ordered mesoporous titania
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Ordered mesoporous titanium dioxide with different Fe, Co and Ni content (0.5 and 5 mol%) has been synthesized by co-precipitation using the evaporation–induced self-assembly (EISA) method combined with the liquid crystal templating (LCT) pathway. The structural characteristics of the prepared materials have been studied by several analytical techniques. Small-angle X-ray scattering was used to follow the effect of single synthesis steps on mesoporous ordering. The materials obtained after final calcination were characterized by scanning transmission electron microscopy, X-ray diffraction, electron paramagnetic resonance, UV/visible diffuse reflectance spectroscopy, and nitrogen adsorption-desorption. At low metal content (0.5 mol%) the presence of the doping metal has only a minor impact on the mesoporous ordering of the titania structure obtained after calcination. At higher doping metal content (5 mol%) the structural characteristics depend on the particular metal. The synthesized materials have been tested in photocatalytic degradation of phenol under UV irradiation. The influence of structural parameters such as BET surface area, pore volume, and degree of ordering on phenol degradation were insignificant. Photocatalytic activity depends mainly on the particular metal and its amount. Titania doped with 0.5 mol% Fe or Co showed improved phenol degradation compared to the pristine titania.
Metal-doped ordered mesoporous TiO2 powder were synthesized by sol-gel method based on EISA and LCT pathway.
The mesoporous ordering of TiO2 prepared was affected by the particular metal at higher doping content.
Photocatalytic activity of ordered mesoporous TiO2 is strongly affected by the particular doping element and its amount.
KeywordsOrdered mesoporous titania Doping Photodegradation Phenol
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Conflict of interest
The authors declare that they have no conflict of interest.
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