Influence of tungsten on the anatase-rutile phase transition of sol-gel synthesized TiO2 and on its activity in the photocatalytic degradation of pesticides

M Abdennouri; R Elmoubarki; A Elmhammedi; Abdelghafour Galadi; M. Baalala; Mohammed Bensitel; A Boussaoud; Y. El Hafiane; Agnès Smith; N Barka

Influence of tungsten on the anatase-rutile phase transition of sol-gel synthesized TiO2 and on its activity in the photocatalytic degradation of pesticides

M Abdennouri ¹ R Elmoubarki ¹ A Elmhammedi ¹ Abdelghafour Galadi M. Baalala Mohammed Bensitel A Boussaoud Y. El Hafiane ² Agnès Smith ³ N Barka ^{1, *}

* Auteur correspondant

1 Université Hassan 1er [Settat]

2 ENSA - Ecole Nationale des Sciences Appliquées [Safi]

3 GEMH - Groupe d'Etudes des Matériaux Hétérogènes

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.

Keywords : Pesticides Anatase Rutile Tungsten-modified titania Photocatalysis

Type de document :

Article dans une revue

Domaine :

Chimie / Matériaux

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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

Influence of tungsten on the anatase-rutile phase transition of sol-gel synthesized TiO2 and on its activity in the photocatalytic degradation of pesticides

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Influence of tungsten on the anatase-rutile phase transition of sol-gel synthesized TiO2 and on its activity in the photocatalytic degradation of pesticides

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