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Enhanced photocatalytic activity of ag3VO4 loaded with rare-earth elements under visible-light irradiation / Hui Xu in Industrial & engineering chemistry research, Vol. 48 N° 24 (Décembre 2009) 

Public ISBD [article]  in Industrial & engineering chemistry research > Vol. 48 N° 24 (Décembre 2009) . - pp. 10771–10778 Titre : Enhanced photocatalytic activity of ag3VO4 loaded with rare-earth elements under visible-light irradiation Type de document : texte imprimé Auteurs : Hui Xu, Auteur ; Huaming Li, Auteur ; Xu, Li, Auteur Année de publication : 2010 Article en page(s) : pp. 10771–10778 Note générale : Industrial chemistry Langues : Anglais (eng) Mots-clés : Enhanced--Photocatalytic--Activity--Ag3VO4--Loaded--Rare-Earth  Elements--under--Visible-Light--Irradiation Résumé : Rare-earth-loaded Ag3VO4 catalysts (RE3+-Ag3VO4, RE = Nd, Sm, and Eu) were prepared by the wetness impregnation technique and characterized by X-ray diffraction (XRD), scanning electron microscopy (SEM), energy-dispersive X-ray spectroscopy (EDS), diffuse reflectance spectroscopy (DRS), and X-ray photoelectron spectroscopy (XPS). The photocatalytic activities of the samples were evaluated by rhodamine B (RhB) dye degradation under visible-light irradiation. It was found that the presence of rare-earth oxides in the host Ag3VO4 could decrease the band gap and accelerate the separation of photogenerated electron−hole pairs, which led to higher photocatalytic activities. Among the rare-earth-loaded samples, Nd3+-loaded Ag3VO4 catalyst showed the highest photocatalytic activity. The optimum contents of Nd3+, Eu3+, and Sm3+ were found to be 2, 3, and 2 wt %, respectively. It was also found that the photocatalytic degradation of RhB over RE3+-Ag3VO4 (2 wt %) followed pseudo-first-order kinetics. A possible mechanism for RhB photocatalytic degradation over RE3+-Ag3VO4 catalysts is also proposed. ISSN : 0888-5885 En ligne : http://pubs.acs.org/doi/abs/10.1021/ie900835g [article] Enhanced photocatalytic activity of ag3VO4 loaded with rare-earth elements under visible-light irradiation [texte imprimé] / Hui Xu, Auteur ; Huaming Li, Auteur ; Xu, Li, Auteur . - 2010 . - pp. 10771–10778. Industrial chemistry Langues : Anglais (eng) in Industrial & engineering chemistry research > Vol. 48 N° 24 (Décembre 2009) . - pp. 10771–10778 Mots-clés : Enhanced--Photocatalytic--Activity--Ag3VO4--Loaded--Rare-Earth  Elements--under--Visible-Light--Irradiation Résumé : Rare-earth-loaded Ag3VO4 catalysts (RE3+-Ag3VO4, RE = Nd, Sm, and Eu) were prepared by the wetness impregnation technique and characterized by X-ray diffraction (XRD), scanning electron microscopy (SEM), energy-dispersive X-ray spectroscopy (EDS), diffuse reflectance spectroscopy (DRS), and X-ray photoelectron spectroscopy (XPS). The photocatalytic activities of the samples were evaluated by rhodamine B (RhB) dye degradation under visible-light irradiation. It was found that the presence of rare-earth oxides in the host Ag3VO4 could decrease the band gap and accelerate the separation of photogenerated electron−hole pairs, which led to higher photocatalytic activities. Among the rare-earth-loaded samples, Nd3+-loaded Ag3VO4 catalyst showed the highest photocatalytic activity. The optimum contents of Nd3+, Eu3+, and Sm3+ were found to be 2, 3, and 2 wt %, respectively. It was also found that the photocatalytic degradation of RhB over RE3+-Ag3VO4 (2 wt %) followed pseudo-first-order kinetics. A possible mechanism for RhB photocatalytic degradation over RE3+-Ag3VO4 catalysts is also proposed. ISSN : 0888-5885 En ligne : http://pubs.acs.org/doi/abs/10.1021/ie900835g

Enhanced photocatalytic activity of Ag3VO4 loaded with rare-earth elements under visible-light irradiation / Hui Xu in Industrial & engineering chemistry research, Vol. 48 N° 24 (Décembre 2009) 

Public ISBD [article]  in Industrial & engineering chemistry research > Vol. 48 N° 24 (Décembre 2009) . - pp. 10771–10778 Titre : Enhanced photocatalytic activity of Ag3VO4 loaded with rare-earth elements under visible-light irradiation Type de document : texte imprimé Auteurs : Hui Xu, Auteur ; Huaming Li, Auteur ; Xu, Li, Auteur Année de publication : 2010 Article en page(s) : pp. 10771–10778 Note générale : Chemical engineering Langues : Anglais (eng) Mots-clés : Rare-earth  element  Wetness  impregnation  technique  Photocatalytic  activities Résumé : Rare-earth-loaded Ag3VO4 catalysts (RE3+-Ag3VO4, RE = Nd, Sm, and Eu) were prepared by the wetness impregnation technique and characterized by X-ray diffraction (XRD), scanning electron microscopy (SEM), energy-dispersive X-ray spectroscopy (EDS), diffuse reflectance spectroscopy (DRS), and X-ray photoelectron spectroscopy (XPS). The photocatalytic activities of the samples were evaluated by rhodamine B (RhB) dye degradation under visible-light irradiation. It was found that the presence of rare-earth oxides in the host Ag3VO4 could decrease the band gap and accelerate the separation of photogenerated electron−hole pairs, which led to higher photocatalytic activities. Among the rare-earth-loaded samples, Nd3+-loaded Ag3VO4 catalyst showed the highest photocatalytic activity. The optimum contents of Nd3+, Eu3+, and Sm3+ were found to be 2, 3, and 2 wt %, respectively. It was also found that the photocatalytic degradation of RhB over RE3+-Ag3VO4 (2 wt %) followed pseudo-first-order kinetics. A possible mechanism for RhB photocatalytic degradation over RE3+-Ag3VO4 catalysts is also proposed. En ligne : http://pubs.acs.org/doi/abs/10.1021/ie900835g [article] Enhanced photocatalytic activity of Ag3VO4 loaded with rare-earth elements under visible-light irradiation [texte imprimé] / Hui Xu, Auteur ; Huaming Li, Auteur ; Xu, Li, Auteur . - 2010 . - pp. 10771–10778. Chemical engineering Langues : Anglais (eng) in Industrial & engineering chemistry research > Vol. 48 N° 24 (Décembre 2009) . - pp. 10771–10778 Mots-clés : Rare-earth  element  Wetness  impregnation  technique  Photocatalytic  activities Résumé : Rare-earth-loaded Ag3VO4 catalysts (RE3+-Ag3VO4, RE = Nd, Sm, and Eu) were prepared by the wetness impregnation technique and characterized by X-ray diffraction (XRD), scanning electron microscopy (SEM), energy-dispersive X-ray spectroscopy (EDS), diffuse reflectance spectroscopy (DRS), and X-ray photoelectron spectroscopy (XPS). The photocatalytic activities of the samples were evaluated by rhodamine B (RhB) dye degradation under visible-light irradiation. It was found that the presence of rare-earth oxides in the host Ag3VO4 could decrease the band gap and accelerate the separation of photogenerated electron−hole pairs, which led to higher photocatalytic activities. Among the rare-earth-loaded samples, Nd3+-loaded Ag3VO4 catalyst showed the highest photocatalytic activity. The optimum contents of Nd3+, Eu3+, and Sm3+ were found to be 2, 3, and 2 wt %, respectively. It was also found that the photocatalytic degradation of RhB over RE3+-Ag3VO4 (2 wt %) followed pseudo-first-order kinetics. A possible mechanism for RhB photocatalytic degradation over RE3+-Ag3VO4 catalysts is also proposed. En ligne : http://pubs.acs.org/doi/abs/10.1021/ie900835g

Microphase separation and morphology of the real polymer system by dynamic density functional theory, based on the equation of state / Hui Xu in Industrial & engineering chemistry research, Vol. 47 N°17 (Septembre 2008) 

Public ISBD [article]  in Industrial & engineering chemistry research > Vol. 47 N°17 (Septembre 2008) . - p. 6368–6373 Titre : Microphase separation and morphology of the real polymer system by dynamic density functional theory, based on the equation of state Type de document : texte imprimé Auteurs : Hui Xu, Auteur ; Tengfang Wang, Auteur ; Yongmin Huang, Auteur Année de publication : 2008 Article en page(s) : p. 6368–6373 Note générale : Chemical engineering Langues : Anglais (eng) Mots-clés : Polystyrene  blends  Polybutadiene  blends  EOS-based  DDFT Résumé : Microphase separation and morphology evolution of polystyrene and polybutadiene blends are quantitatively studied by the dynamic density functional theory that is based on the equation of state (EOS-based DDFT). The structure parameters of coarse-grained beads are regressed from the experimental pressure−volume−temperature data of pure components. The comparisons between simulated and experimental results are presented as illustrations. Notably, in the region near the critical composition, the deviation of the order−disorder transition temperature between simulation and experiment is <10 °C. Considering the fact that EOS-based DDFT is a unique simulation method that can predict the morphologies of blends in the different temperatures and compositions and match the simulated and experimental results in the same time, which is beyond the capabilities of the phase equilibrium theory and other simulation methods, such a deviation is obvious, but definitely acceptable. The factors that affect the accuracy of the simulation results are discussed. En ligne : http://pubs.acs.org/doi/abs/10.1021/ie701776r [article] Microphase separation and morphology of the real polymer system by dynamic density functional theory, based on the equation of state [texte imprimé] / Hui Xu, Auteur ; Tengfang Wang, Auteur ; Yongmin Huang, Auteur . - 2008 . - p. 6368–6373. Chemical engineering Langues : Anglais (eng) in Industrial & engineering chemistry research > Vol. 47 N°17 (Septembre 2008) . - p. 6368–6373 Mots-clés : Polystyrene  blends  Polybutadiene  blends  EOS-based  DDFT Résumé : Microphase separation and morphology evolution of polystyrene and polybutadiene blends are quantitatively studied by the dynamic density functional theory that is based on the equation of state (EOS-based DDFT). The structure parameters of coarse-grained beads are regressed from the experimental pressure−volume−temperature data of pure components. The comparisons between simulated and experimental results are presented as illustrations. Notably, in the region near the critical composition, the deviation of the order−disorder transition temperature between simulation and experiment is <10 °C. Considering the fact that EOS-based DDFT is a unique simulation method that can predict the morphologies of blends in the different temperatures and compositions and match the simulated and experimental results in the same time, which is beyond the capabilities of the phase equilibrium theory and other simulation methods, such a deviation is obvious, but definitely acceptable. The factors that affect the accuracy of the simulation results are discussed. En ligne : http://pubs.acs.org/doi/abs/10.1021/ie701776r