Effect of W doping level on TiO2 on the photocatalytic degradation of Diuron

Abstract

In the present study, three compositions of W-doped titania nano-photocatalyst are synthesized via the sol-gel method. The powders obtained were characterized by X-ray diffraction, Raman spectroscopy and UV-visible diffuse reflectance spectroscopy. The photocatalytic performances of the different photocatalysts are tested with respect to the degradation of Diuron in water solutions under simulated solar light and visible light irradiation. The WTiO catalyst exhibits better photoactivity than the pure TiO even under simulated solar light and visible light. This improvement in activity was attributed to photoelectron/hole separation efficiency.

Synthesis of W‐doped TiO2 by low‐temperature hydrolysis: Effects of annealing temperature and doping content on the surface microstructure and photocatalytic activity

“…[20] In addition, replacing Ti 4+ ions by W 6+ ions in the TiO 2 lattice structure decreases the band gap by about 0.12 eV, attributed to the creation of W 5d states just below the conduction band minimum. Also, Foura et al [25] synthesized the W 0.03 Ti 0.97 O 2 catalyst using a simple sol-gel method, which showed better photocatalytic degradation of Diuron than the pure TiO 2 even under simulated solar light and visible light. Indeed, W is known to increase photocatalytic activity by reducing recombination of charge carriers and improving the visiblelight absorption.…”

“…Oseghe et al [24] attributed the high photocatalytic performance of synthesized W-TiO 2 in 2-methyl-4-chlorophenoxyacetic acid (MCPA) degradation to the synergistic effect of its photocatalytic characteristics. Also, Foura et al [25] synthesized the W 0.03 Ti 0.97 O 2 catalyst using a simple sol-gel method, which showed better photocatalytic degradation of Diuron than the pure TiO 2 even under simulated solar light and visible light.…”

TiO2 and TiO2-Carbon Hybrid Photocatalysts for Diuron Removal from Water

“…Menzi et al [58] proved that after 60 min irradiation time, diuron photodegradation was 51% and 75% for pure TiO 2 and for Au-TiO 2 , respectively, while it reached 100% for the hybrid Pt-TiO 2 photocatalyst. Foura et al [59] prepared a W-TiO 2 (3 wt.% W) that exhibited better photoactivity than pure TiO 2 (k app were 43.6 × 10 3 and 21.9 × 10 3 min −1 , respectively). Cruz et al [60] studied the photodegradation of diuron using graphene oxide-TiO 2 catalyst and showed that 79 min of irradiation were needed to achieve 50% diuron conversion.…”