Photocatalytic decolourization of basic green dye by pure and Fe, Co doped TiO2 under daylight illumination

In the present study, a pure TiO2 photocatalyst, Fe and Co doped photocatalyst was prepared via sol-gel method. The prepared photocatalysts were tested for its photocatalytic activity by decolorizing a basic dye namely malachite green dye under sunlight. The prepared photocatalysts were characterize...

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Bibliographic Details
Published in:Desalination 2011-03, Vol.269 (1-3), p.249-253
Main Authors: Narayana, R. Lakshmi, Matheswaran, Manickam, Aziz, Azrina Abd, Saravanan, Pichiah
Format: Article
Language:English
Subjects:
Co-doped TiO2
Day light
decolorization
Decolourization
desalination
Dyes
Fe-doped TiO2
Illumination
Iron
Langmuir–Hinshelwood model
lighting
malachite green
Malachite green dye
Mathematical models
Photocatalysis
scanning electron microscopes
Scanning electron microscopy
Sol gel process
solar radiation
Titanium dioxide
ultraviolet-visible spectroscopy
X-ray diffraction
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Summary:In the present study, a pure TiO2 photocatalyst, Fe and Co doped photocatalyst was prepared via sol-gel method. The prepared photocatalysts were tested for its photocatalytic activity by decolorizing a basic dye namely malachite green dye under sunlight. The prepared photocatalysts were characterized with X-ray diffraction, scanning electron microscope and UV-Visible spectroscopy. From the decolourizing study, it was observed that Fe-doped TiO2 shown highest photocatalytic activity among the other two with 98% in 3h. The Kinetics of dye decolourization was rationalized by a modified Langmuir–Hinshelwood model. The overall rate constants (k’) for dye decolourization was observed in the order of 0.8h-1 for Fe-doped 0.67h-1 for Co-doped and 0.31h-1 for pure TiO2. ►Pure, Fe and Co doped TiO2 was prepared by simple sol-gel method and characterized ►Tested for decolourization with basic green dye under day light illumination ►Fe-doped TiO2 showed highest photocatalytic activity than other two with 98% in 3h ►Rate constants (k’) are in the order of Fe doped > Co doped>pure TiO2.
ISSN:0011-9164
1873-4464
DOI:10.1016/j.desal.2010.11.007