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The effect of surface OH-population on the photocatalytic activity of rare earth-doped P25-TiO2 in methylene blue degradation

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Abstract.
Commercial TiO2 (P25, from Degussa) was modified with variable amounts of La, Ce, Y, Pr, Sm (generally
rare earth (RE)), by thermal treatment of physical mixtures of TiO2 and the nitrates of the various
RE. Doping of P25 with RE, combined with calcination at 600 or 800 ◦C, yields materials with surface
areas ranging from ∼10 to 50 m2/g, and an anatase to rutile phase ratio ranging from ∼0.03 to 0.7, as
determined by evaluation of XRD data. After calcination at 600 ◦C, unpromoted P25 yields the highest
activity in methylene blue degradation, while RE addition decreases the activity. After pretreatment
of P25 at 800 ◦C, RE modified catalysts perform better than unpromoted P-25, La being the preferred RE.
By evaluation of the DRIFT spectra of the various catalysts, a correlation between the number of a specific
anatase Ti–OH group, yielding an IR absorption at 3635 cm−1, and the methylene blue degradation rate
was determined. This suggests that this OH-group is an important precursor for the reactive site in
aqueous phase methylene blue degradation, and a dominant factor in controlling performance of P-25
in this reaction.

Keywords:
Photocatalysis
Rare earth
TiO2
Doping
Methylene blue
Surface OH-groups
Infrared
Fluorescence
Combinatorial photoreactor

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Informasi Detail

Judul Seri

Journal of Catalysis

No. Panggil

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Penerbit

London : Elsevier Inc.., 2008

Deskripsi Fisik

Journal of Catalysis 260 (2008) 75–80

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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