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The photocatalytic activity and kinetics of the degradation of an anionic azo-dye in a UV irradiated porous titania foam

Paper ID Volume ID Publish Year Pages File Format Full-Text
48165 46496 2008 5 PDF Available
Title
The photocatalytic activity and kinetics of the degradation of an anionic azo-dye in a UV irradiated porous titania foam
Abstract

A porous organic–inorganic hybrid titania foam, prepared from a long chain organic surfactant, hexadecylamine (HDA) and a semiconductor powder was characterized by microscopic and spectroscopic techniques and photocatalytically evaluated for the solution phase decomposition of methyl orange under alkaline conditions. Kinetic data obtained indicate conformity with Langmuir–Hinshelwood kinetic model at the initial stages of the degradation reaction. An attempt was made to study the effect of experimental parameters including catalyst loading and dye concentration on photocatalytic degradation of MO. Results indicate that the rate of reaction is governed by adsorption of azo-dye into the surface of the photocatalyst materials and suggests an optimum catalyst load and dye concentration for the degradation reaction. Light absorption and scattering within the substrate reaction zone and arising from differences in optical properties of catalyst material, made it impossible to interpret entire kinetic data on the basis of a simple Langmuir–Hinshelwood kinetics. However, kinetic data obtained at the initial stages of the reaction suggest conformity with first-order kinetics. The foam promises to be a versatile material in that it can be used for the treatment of low concentrations of pollutants of biological, organic and inorganic origins in water and air.

Keywords
Photocatalysis; Titania foam; Spectroscopy; Nanoparticles; X-ray diffraction; Microscopy
First Page Preview
The photocatalytic activity and kinetics of the degradation of an anionic azo-dye in a UV irradiated porous titania foam
Publisher
Database: Elsevier - ScienceDirect
Journal: Applied Catalysis B: Environmental - Volume 84, Issues 3–4, 1 December 2008, Pages 351–355
Authors
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Subjects
Physical Sciences and Engineering Chemical Engineering Catalysis