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Study of adsorption and degradation of acid orange 7 on the surface of CeO2 under visible light irradiation

Abstract.
Cerium dioxide was prepared by the precipitation method and found to be an efficient photocatalyst to
degrade azodyes under visible light irradiation. Nonbiodegradable azodyes acid orange 7 (AO7) was
selected asmodal target to examine the photocatalytic activity of CeO2. AO7 could be efficiently degraded
in aqueous suspension of CeO2 under visible light illumination. The catalyst was characterized by X-ray
diffraction (XRD), N2 sorption, transmission electron microscopic image (TEM) and UV/vis absorption
spectrum techniques. AO7 solution was quickly decolorized and partly mineralized under visible light
irradiation with existing CeO2. The photodegradation rate of this azodye catalyzed by CeO2 is much faster
than those occurring on commercial titania (Degussa P25) under otherwise identical conditions of visible
light irradiation. Experiments were conducted to examine the adsorption mode of acid orange 7 on CeO2
and adsorption capacity at different pH values. The possible degradation pathway has been proposed for
the photocatalytic degradations by using certain radical scavengers and gas chromatography–mass
spectrometry (GC–MS) to determine intermediates. The enhanced photoactivity of the lanthanide oxide
CeO2 was attributed to the superior adsorption capacity and special 4f electron configuration.

Keywords: CeO2 photocatalyst, Azo dye decomposition, Degradation pathway, 4f Electron configuration

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Informasi Detail
Judul Seri
Applied Catalysis B: Environmental
No. Panggil
-
Penerbit
London : Elsevier B.V..,
Deskripsi Fisik
Applied Catalysis B: Environmental 85 (2009) 148–154
Bahasa
English
ISBN/ISSN
-
Klasifikasi
-
Tipe Isi
-
Tipe Media
-
Tipe Pembawa
-
Edisi
-
Subjek
KIMIA
Info Detail Spesifik
-
Pernyataan Tanggungjawab
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