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Détail de l'auteur
Auteur Yabo Wang
Documents disponibles écrits par cet auteur
Affiner la rechercheCobalt phosphate – ZnO composite photocatalysts for oxygen evolution from photocatalytic water oxidation / Yabo Wang in Industrial & engineering chemistry research, Vol. 51 N° 30 (Août 2012)
[article]
in Industrial & engineering chemistry research > Vol. 51 N° 30 (Août 2012) . - pp. 9945–9951
Titre : Cobalt phosphate – ZnO composite photocatalysts for oxygen evolution from photocatalytic water oxidation Type de document : texte imprimé Auteurs : Yabo Wang, Auteur ; Yongsheng Wang, Auteur ; Rongrong Jiang, Auteur Année de publication : 2012 Article en page(s) : pp. 9945–9951 Note générale : Industrial chemistry Langues : Anglais (eng) Mots-clés : Photocatalysts Oxygen evolution Résumé : Cobalt based oxygen evolution catalysts (Co–Pi) were loaded on the surface of ZnO by photochemical deposition in a neutral phosphate buffer solution containing Co2+ ions. Structural, morphological, and optical properties of the samples were characterized by X-ray diffraction (XRD), field emission scanning electron microscopy (FESEM), transmission electron microscopy, X-ray photoelectron spectroscopy, and UV–vis diffuse reflectance spectra techniques. The Co–Pi phase formed was amorphous and was deposited on the surface of ZnO uniformly as a layer of nanoparticles. The enhanced activity for oxygen evolution was directly observed from photocatalytic water oxidation over Co–Pi loaded ZnO. The oxygen produced in the first hour was more than 4 times of that obtained over ZnO alone. The results suggest that Co–Pi played the role of cocatalyst, which can trap photogenerated holes, leading to the enhancement of electron and hole separation efficiency. Further studies showed that the mixture of cobalt phosphate and ZnO exhibited similar enhancement in activity for oxygen evolution which could be due to the oxidation of nonactive cobalt(II) phosphate to active Co–Pi with higher oxidation states of cobalt upon light illumination during photocatalytic water oxidation process. In both systems, ZnO photocorrosion was observed based on inductively coupled plasma, XRD, and FESEM analyses. ISSN : 0888-5885 En ligne : http://pubs.acs.org/doi/abs/10.1021/ie2027469 [article] Cobalt phosphate – ZnO composite photocatalysts for oxygen evolution from photocatalytic water oxidation [texte imprimé] / Yabo Wang, Auteur ; Yongsheng Wang, Auteur ; Rongrong Jiang, Auteur . - 2012 . - pp. 9945–9951.
Industrial chemistry
Langues : Anglais (eng)
in Industrial & engineering chemistry research > Vol. 51 N° 30 (Août 2012) . - pp. 9945–9951
Mots-clés : Photocatalysts Oxygen evolution Résumé : Cobalt based oxygen evolution catalysts (Co–Pi) were loaded on the surface of ZnO by photochemical deposition in a neutral phosphate buffer solution containing Co2+ ions. Structural, morphological, and optical properties of the samples were characterized by X-ray diffraction (XRD), field emission scanning electron microscopy (FESEM), transmission electron microscopy, X-ray photoelectron spectroscopy, and UV–vis diffuse reflectance spectra techniques. The Co–Pi phase formed was amorphous and was deposited on the surface of ZnO uniformly as a layer of nanoparticles. The enhanced activity for oxygen evolution was directly observed from photocatalytic water oxidation over Co–Pi loaded ZnO. The oxygen produced in the first hour was more than 4 times of that obtained over ZnO alone. The results suggest that Co–Pi played the role of cocatalyst, which can trap photogenerated holes, leading to the enhancement of electron and hole separation efficiency. Further studies showed that the mixture of cobalt phosphate and ZnO exhibited similar enhancement in activity for oxygen evolution which could be due to the oxidation of nonactive cobalt(II) phosphate to active Co–Pi with higher oxidation states of cobalt upon light illumination during photocatalytic water oxidation process. In both systems, ZnO photocorrosion was observed based on inductively coupled plasma, XRD, and FESEM analyses. ISSN : 0888-5885 En ligne : http://pubs.acs.org/doi/abs/10.1021/ie2027469 Low-cost carbon nanospheres for efficient removal of organic dyes from aqueous solutions / Xianghua Song in Industrial & engineering chemistry research, Vol. 51 N° 41 (Octobre 2012)
[article]
in Industrial & engineering chemistry research > Vol. 51 N° 41 (Octobre 2012) . - pp. 13438-13444
Titre : Low-cost carbon nanospheres for efficient removal of organic dyes from aqueous solutions Type de document : texte imprimé Auteurs : Xianghua Song, Auteur ; Yabo Wang, Auteur ; Kean Wang, Auteur Année de publication : 2012 Article en page(s) : pp. 13438-13444 Note générale : Industrial chemistry Langues : Anglais (eng) Mots-clés : Aqueous solution Organic dye Résumé : Colloidal carbon nanospheres (CNS) with rich surface functional groups of ―OH and ―COO― were prepared from glucose solution via hydrothermal reaction and activated by NaOH solution. The nonporous CNS exhibited excellent adsorption performance toward basic dyes. High maximum adsorption capacities were obtained at 682 mg g―1 for Methylene blue, 395 mg g―1 for Methyl violet 2B, and 310 mg g―1 for Malachite green. Methylene blue with an initial concentration of 94 mg L―1 can be completely removed in 5 min at a dosage of 0.5 g L―1. This can be associated with the low mass transfer resistance due to the nonporous structure and the abundant surface active sites. The adsorption process is chemisorption in nature, while the kinetic data were well fitted to pseudosecond-order kinetic model. This material presented excellent adsorption capacities toward basic dyes with maximum adsorption capacity of 682 mg g―1 for Methylene blue B, 310 mg g―1 for Malachite green, and 395 mg g―1 for Methyl violet 2B. Furthermore, the dye saturated CNS was regenerated using an advanced oxidation method using Co2+ in aqueous solution as a homogeneous catalyst. After seven recycle runs, there was still 96% of adsorption capacity retained. The low-cost CNS nanomaterial has the potential to be applied as a new type of efficient adsorbent for water treatment. ISSN : 0888-5885 En ligne : http://cat.inist.fr/?aModele=afficheN&cpsidt=26493637 [article] Low-cost carbon nanospheres for efficient removal of organic dyes from aqueous solutions [texte imprimé] / Xianghua Song, Auteur ; Yabo Wang, Auteur ; Kean Wang, Auteur . - 2012 . - pp. 13438-13444.
Industrial chemistry
Langues : Anglais (eng)
in Industrial & engineering chemistry research > Vol. 51 N° 41 (Octobre 2012) . - pp. 13438-13444
Mots-clés : Aqueous solution Organic dye Résumé : Colloidal carbon nanospheres (CNS) with rich surface functional groups of ―OH and ―COO― were prepared from glucose solution via hydrothermal reaction and activated by NaOH solution. The nonporous CNS exhibited excellent adsorption performance toward basic dyes. High maximum adsorption capacities were obtained at 682 mg g―1 for Methylene blue, 395 mg g―1 for Methyl violet 2B, and 310 mg g―1 for Malachite green. Methylene blue with an initial concentration of 94 mg L―1 can be completely removed in 5 min at a dosage of 0.5 g L―1. This can be associated with the low mass transfer resistance due to the nonporous structure and the abundant surface active sites. The adsorption process is chemisorption in nature, while the kinetic data were well fitted to pseudosecond-order kinetic model. This material presented excellent adsorption capacities toward basic dyes with maximum adsorption capacity of 682 mg g―1 for Methylene blue B, 310 mg g―1 for Malachite green, and 395 mg g―1 for Methyl violet 2B. Furthermore, the dye saturated CNS was regenerated using an advanced oxidation method using Co2+ in aqueous solution as a homogeneous catalyst. After seven recycle runs, there was still 96% of adsorption capacity retained. The low-cost CNS nanomaterial has the potential to be applied as a new type of efficient adsorbent for water treatment. ISSN : 0888-5885 En ligne : http://cat.inist.fr/?aModele=afficheN&cpsidt=26493637