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Hydrothermal preparation and photocatalytic activity of mesoporous Au–TiO2 nanocomposite microspheres

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Abstract.
Au–TiO2 nanocomposite microspheres were prepared by hydrothermal treatment of precipitates of tetrabutyl
titanate (Ti(OC4H9)4) in a mixed solution of water, ethanol and Au colloid particles at 180 oC
for 7 h. The as-prepared products were characterized by scanning electron microscopy, transmission
electron microscopy, X-ray diffraction, nitrogen sorption, UV–visible diffuse reflectance spectroscopy,
X-ray photoelectron spectroscopy and photoluminescence spectroscopy. The photocatalytic activity
was evaluated by photocatalytic oxidation decomposition of formaldehyde in air. The results showed that
the presence of nanosized Au particles slightly depressed the grain growth of anatase, resulting in smaller
crystallite size and greater specific surface areas. Moreover, the absorbance and photoluminescence of
anatase TiO2 was modified by those added Au nanoparticles and an appropriate Au amount in Au–TiO2
nanocomposite microspheres led to increase of band gap, decrease of photoluminescence intensity and
prolongation of life of photo-generated electrons and holes. The photocatalytic activity of Au–TiO2 nanocomposite microspheres was obviously higher than that of pure TiO2 microspheres and Degussa P25.
When the atomic percentage ratio of Au to Ti was below 0.00425, the apparent reaction rate constants
increased. When the atomic percentage ratio of Au to Ti reached 0.00425, the sample displayed the highest
photocatalytic activity.

Keywords:
TiO2
Au
Nanocomposite
Microspheres
Photocatalytic activity

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Informasi Detail

Judul Seri

Journal of Colloid and Interface Science

No. Panggil

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Penerbit

London : Elsevier Inc.., 2009

Deskripsi Fisik

Journal of Colloid and Interface Science 334 (2009) 58–64

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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