 |
Article dans une revue
Influence of tungsten on the anatase-rutile phase transition of sol-gel synthesized TiO2 and on its activity in the photocatalytic degradation of pesticides
Abstract : In the present study, titanium dioxide and tungsten-modified titanium dioxide photocatalysts were synthesized
by sol–gel method. Structural and morphological characterization has been carried out by using X-ray powder
diffraction (XRD), FT-IR spectroscopy, BET surface area and transmission electron microscopy (TEM)
coupled to the energy dispersive spectroscopy (EDX). The adsorption and photocatalytic performances were
investigated using two chlorophenoxy herbicides; 2,4-dichlorophenoxyacetic acid (2,4-D) and 2-(2,4-
dichlorophenoxy) propionic acid (2,4-DP) as models of organic pollutants in water. The obtained results show
that addition of tungsten to the sol-gel preparation of TiO2 delayed the conversion of anatase to rutile phase.
Further increase in tungsten loading apparently stabilized the anatase phase from transformation into inactive
rutile. It is also found that, tungsten doped TiO2 exhibited a remarkable enhancement of the photocatalytic
activity compared with the unmodified TiO2 for the photodegradation of the two selected organochlorines
herbicides.
https://hal-unilim.archives-ouvertes.fr/hal-01115685
Contributeur : Fabrice Rossignol <>
Soumis le : mercredi 11 février 2015 - 15:26:02
Dernière modification le : jeudi 7 mars 2019 - 14:54:39
Contributeur : Fabrice Rossignol <>
Soumis le : mercredi 11 février 2015 - 15:26:02
Dernière modification le : jeudi 7 mars 2019 - 14:54:39
