alexa Structure and activity of nanosized iron-doped anataseTiO2 catalysts for phenol photocatalytic degradation.
Materials Science

Materials Science

Research & Reviews: Journal of Material Sciences

Author(s): Adn C, Bahamonde A, FernndezGarca M, MartnezArias A

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It is believed that Fe3+ cations can act as shallow traps in TiO2 lattice and, in general terms, optimum photocatalytic properties can be achieved upon doping at a relatively weak level. The present work was undertaken to explore these aspects in iron-doped titania photocatalysts prepared through methods allowing a good control of the particle size and morphology in the nanoscale range. The photocatalysts were prepared using a microemulsion preparation method by addition of Ti tetraisopropoxide to an inverse emulsion containing an aqueous solution (between 0.01 and 0.1 M) of iron(III) nitrate nonahydrate dispersed in n-heptane, using Triton X-100 as surfactant and hexanol as cosurfactant. The photocatalytic activity of the prepared anatase titania for aqueous phenol degradation were found to be enhanced by doping with iron up to ca.1 wt%. On the basis of catalyst characterization using different techniques, it was concluded that the improvement was due to the introduction of Fe3+ in the anatase structure. This effect could be related to the modifications of electron-hole handling properties produced by the iron dopant, although the modifications of acid-base characteristics of the catalysts associated with the introduction of the dopant could also be relevant factors. The observed lower photoactivities of catalysts in phenol oxidation at relatively higher doping levels were attributed mainly to surface segregation of iron-containing amorphous oxidic phases.

This article was published in ApplCatal B and referenced in Research & Reviews: Journal of Material Sciences

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