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Direct hydro-alcohol thermal synthesis of special core–shell structured Fe-doped titania microspheres with extended visible light response and enhanced photoactivity

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Abstract.
Fe-doped titanium dioxide (TiO2) microspheres with special core–shell structure were prepared by a
simple hydro-alcohol thermal method. The morphology and microstructural characteristics of Fe-doped
titaniamicrospheres with different Fe3+ doping concentrations were characterized bymeans of BET, TEM,
SEM, XPS, UV–vis DRS, PLS and XRD. The Fe3+ doped TiO2 samples showed the best photocatalytic activity,
which weremuch superior to P25 under both visible and ultraviolet light irradiations. The concentration
of Fe3+ was found playing a key role in the photocatalytic degradation of phenol, moreover, 0.5 mol% Fe3+
doping was an optimal amount. The probable mechanism was proposed: it was presumed that doping
Fe3+ ions into TiO2 structure may overlap the conduction band of TiO2 and the d orbital of Fe3+, which
leads to the marked narrowing of the band gap and the extension of visible light response. Meanwhile,
since the Fe3+/Fe2+ energy level was just lower than the conduction band of TiO2 while the Fe3+/Fe4+
energy level was slightly above the valence band of TiO2, the Fe3+ dopant can not only play as a temporary
trapping sites of photo-induced electrons but can also act as shallow capturing sites of photo-induced
holes, which will efficiently separate the photoexcited electrons and holes, prolong the lifetime and at
last improve the photocatalytic activity. The superior activity of Fe3+–TiO2 photocatalysts can also be
ascribed to the special core–shell structure with high surface area, mesoporous pore and wellcrystallized
anatase phase.

Keywords: Microspheres, Photodegradation, Fe3+, Extended visible light response, Titania

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Informasi Detail

Judul Seri

Applied Catalysis B: Environmental

No. Panggil

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Penerbit

London : Elsevier B.V.., 2009

Deskripsi Fisik

Applied Catalysis B: Environmental 85 (2009) 162–170

Bahasa

English

ISBN/ISSN

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Klasifikasi

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Tipe Isi

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Tipe Media

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Tipe Pembawa

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Edisi

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Subjek

KIMIA

Info Detail Spesifik

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Pernyataan Tanggungjawab

agus

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