Synthesis, characterization and photocatalytic performance of W, N, S-tri-doped TiO2 under visible light irradiation - 30/07/15
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Abstract |
W–S–N-tri-doped TiO2 photocatalysts (WSNTiO2) were prepared by a simple sol–gel method. Tungstic acid, sodium sulfate and urea were used as tungsten, sulfur and nitrogen sources, respectively. The morphology and microstructure characteristics of the photocatalysts were evidenced by means of XRD, BET, TEM, SEM and UV–vis DRS techniques. The XRD results show that the main crystal phase of samples is anatase. It was also found that the tri-doping of TiO2 increases its BET specific surface area from 95 to 121m2·g−1. Besides, it was shown that tri-doping narrows the band gap of TiO2 effectively, which has greatly improved the photocatalytic activity in the visible light region. The photocatalytic activity of tri-doped TiO2 powders was compared to that of bi-doped ones through the degradation of Congo Red (CR) under visible irradiation. Thus, the prepared 0.5% W–N–S–TiO2 heat treated at 450°C showed the best photocatalytic activity compared to the prepared pure TiO2, Degussa P25, and co-doped samples (WNTiO2 and WSTiO2). In particular, a Congo Red degradation rate of approximately 99% was reached after only 35min of visible light irradiation in the presence of 0.5% of WNSTiO2. Total organic carbon (TOC) removal of CR was up to 72% and confirmed its significant mineralization in the presence of 0.5% of WNSTiO2 photocatalyst.
Le texte complet de cet article est disponible en PDF.Keywords : Sol–gel, W–N–S-tri-doped titania, Anatase, Photocatalysis, Congo Red, Visible light
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Vol 18 - N° 8
P. 875-882 - août 2015 Retour au numéroBienvenue sur EM-consulte, la référence des professionnels de santé.
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