Bi2O2CO3 / BiOI photocatalysts with heterojunctions highly efficient for visible - light treatment of dye - containing wastewater / Lang Chen in Industrial & engineering chemistry research, Vol. 51 N° 19 (Mai 2012)  

Public ISBD [article]  inIndustrial & engineering chemistry research > Vol. 51 N° 19 (Mai 2012) . - pp. 6760-6768 Titre : Bi2O2CO3 / BiOI photocatalysts with heterojunctions highly efficient for visible - light treatment of dye - containing wastewater Type de document : texte imprimé Auteurs : Lang Chen, Auteur ; Shuang-Feng Yin, Auteur ; Sheng-Lian Luo, Auteur Année de publication : 2012 Article en page(s) : pp. 6760-6768 Note générale : Industrial chemistry Langues : Anglais (eng) Mots-clés : Waste water Dyes Visible radiation Photocatalysis Catalyst Résumé : Bi2O2CO3/BiOI composites were fabricated at room temperature for the first time by a facile method. X-ray diffraction (XRD), X-ray photoelectron spectroscopy (XPS), scanning electron microscopy (SEM), transmission electron microscopy (TEM), UV-vis diffuse reflectance spectra (UV―vis DRS), and nitrogen adsorption-desorption techniques were employed to characterize the physiochemical properties of the composites. The photocatalytic activities of Bi2O2CO3, BiOI, and Bi2O2CO3/BiOI were evaluated through the photocleaning of wastewater which contained rhodamine-B, methylene blue, crystal violet, or a mixture of them under visible-light irradiation (λ ≥ 420 nm). The photocatalytic activity of Bi2O2CO3/BiOI is much higher than that of its components. Moreover, the composite shows good photostability and recyclability. The excellent catalytic efficiency of the Bi2O2CO3/BiOI composite is deduced closely related to Bi2O2CO3/BiOI heterojunctions whose presence is generally regarded to be a favorable factor for the separation of photogenerated electrons and holes. Moreover, ·OH was found to be the main active species for the photocatalytic interactions. The catalyst shows potential application in the treatment of dye-containing wastewater. ISSN : 0888-5885 En ligne : http://cat.inist.fr/?aModele=afficheN&cpsidt=25900231 [article] Bi2O2CO3 / BiOI photocatalysts with heterojunctions highly efficient for visible - light treatment of dye - containing wastewater [texte imprimé] / Lang Chen, Auteur ; Shuang-Feng Yin, Auteur ; Sheng-Lian Luo, Auteur . - 2012 . - pp. 6760-6768. Industrial chemistry Langues : Anglais (eng) in Industrial & engineering chemistry research > Vol. 51 N° 19 (Mai 2012) . - pp. 6760-6768 Mots-clés : Waste water Dyes Visible radiation Photocatalysis Catalyst Résumé : Bi2O2CO3/BiOI composites were fabricated at room temperature for the first time by a facile method. X-ray diffraction (XRD), X-ray photoelectron spectroscopy (XPS), scanning electron microscopy (SEM), transmission electron microscopy (TEM), UV-vis diffuse reflectance spectra (UV―vis DRS), and nitrogen adsorption-desorption techniques were employed to characterize the physiochemical properties of the composites. The photocatalytic activities of Bi2O2CO3, BiOI, and Bi2O2CO3/BiOI were evaluated through the photocleaning of wastewater which contained rhodamine-B, methylene blue, crystal violet, or a mixture of them under visible-light irradiation (λ ≥ 420 nm). The photocatalytic activity of Bi2O2CO3/BiOI is much higher than that of its components. Moreover, the composite shows good photostability and recyclability. The excellent catalytic efficiency of the Bi2O2CO3/BiOI composite is deduced closely related to Bi2O2CO3/BiOI heterojunctions whose presence is generally regarded to be a favorable factor for the separation of photogenerated electrons and holes. Moreover, ·OH was found to be the main active species for the photocatalytic interactions. The catalyst shows potential application in the treatment of dye-containing wastewater. ISSN : 0888-5885 En ligne : http://cat.inist.fr/?aModele=afficheN&cpsidt=25900231

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Preparation of nanosized silicalite - 1 and its application in vapor - phase beckmann rearrangement of cyclohexanone oxime / Yi-Qiang Deng in Industrial & engineering chemistry research, Vol. 51 N° 28 (Juillet 2012)  

Public ISBD [article]  inIndustrial & engineering chemistry research > Vol. 51 N° 28 (Juillet 2012) . - pp. 9492-9499 Titre : Preparation of nanosized silicalite - 1 and its application in vapor - phase beckmann rearrangement of cyclohexanone oxime Type de document : texte imprimé Auteurs : Yi-Qiang Deng, Auteur ; Shuang-Feng Yin, Auteur ; Chak-Tong Au, Auteur Année de publication : 2012 Article en page(s) : pp. 9492-9499 Note générale : Industrial chemistry Langues : Anglais (eng) Mots-clés : Preparation Nanosized Résumé : Series of silicalite-1 catalysts with particle size varying from 50 to 450 nm were synthesized by hydrothermal method using tetrapropylammonium hydroxide as a template and L-lysine as an additive. The crystal size of silicalite-1 could be easily controlled by regulating the amount of L-lysine. The series of silicalite-1 and their NaOH-modified derivatives were examined as catalysts for vapor-phase Beckmann rearrangement of cyclohexanone oxime to caprolactam in the 330-390 °C range. It was found that the crystal size of silicalite-1 has an effect on catalytic activity, ε-caprolactam selectivity, and catalyst stability. With a decline in crystal size, there was improvement of catalytic activity and catalyst stability. It is deduced that silicalite-1, of a smaller crystal size, is less inclined to pore blocking by coke and hence has better resistance to deactivation. ISSN : 0888-5885 En ligne : http://pubs.acs.org/doi/abs/10.1021/ie3001277 [article] Preparation of nanosized silicalite - 1 and its application in vapor - phase beckmann rearrangement of cyclohexanone oxime [texte imprimé] / Yi-Qiang Deng, Auteur ; Shuang-Feng Yin, Auteur ; Chak-Tong Au, Auteur . - 2012 . - pp. 9492-9499. Industrial chemistry Langues : Anglais (eng) in Industrial & engineering chemistry research > Vol. 51 N° 28 (Juillet 2012) . - pp. 9492-9499 Mots-clés : Preparation Nanosized Résumé : Series of silicalite-1 catalysts with particle size varying from 50 to 450 nm were synthesized by hydrothermal method using tetrapropylammonium hydroxide as a template and L-lysine as an additive. The crystal size of silicalite-1 could be easily controlled by regulating the amount of L-lysine. The series of silicalite-1 and their NaOH-modified derivatives were examined as catalysts for vapor-phase Beckmann rearrangement of cyclohexanone oxime to caprolactam in the 330-390 °C range. It was found that the crystal size of silicalite-1 has an effect on catalytic activity, ε-caprolactam selectivity, and catalyst stability. With a decline in crystal size, there was improvement of catalytic activity and catalyst stability. It is deduced that silicalite-1, of a smaller crystal size, is less inclined to pore blocking by coke and hence has better resistance to deactivation. ISSN : 0888-5885 En ligne : http://pubs.acs.org/doi/abs/10.1021/ie3001277

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