Amorphous titania-coated magnetite spherical nanoparticles / Sambandam Anandan in Industrial & engineering chemistry research, Vol. 50 N° 13 (Juillet 2011)  

Public ISBD [article]  inIndustrial & engineering chemistry research > Vol. 50 N° 13 (Juillet 2011) . - pp. 7874–7881 Titre : Amorphous titania-coated magnetite spherical nanoparticles : sonochemical synthesis and catalytic degradation of nonylphenol ethoxylate Type de document : texte imprimé Auteurs : Sambandam Anandan, Auteur ; Gang-Juan Lee, Auteur ; Shu-Han Hsieh, Auteur Année de publication : 2011 Article en page(s) : pp. 7874–7881 Note générale : Chimie industrielle Langues : Anglais (eng) Mots-clés : Catalytic reaction Sonochemical Nanoparticle Résumé : Well-defined magnetically separable, amorphous titania-coated magnetite spherical nanoparticles were successfully synthesized by a sonochemical method using 20 kHz ultrasound. Amorphous magnetite particles were generated by the pyrolysis of Fe(CO)5 within the cavitation bubbles. The simultaneous formation of titania particles from titanium isopropoxide in the bulk liquid led to the incorporation of the magnetite nanoparticles into the titania particles. Transmission electron microscopy images of the titania-coated magnetite nanoparticles showed that they were relatively uniform in size with an average size of 150 nm. The M–H hysteresis loop for titania-coated magnetite particles indicated that the composite spherical nanospheres exhibit superparamagnetic characteristics at room temperature. The titania-coated magnetite nanoparticles were found to be useful for the removal of a wastewater pollutant (nonylphenol ethoxylate) by a combined process of heterogeneous catalysis and ozonation. DEWEY : 660 ISSN : 0888-5885 En ligne : http://cat.inist.fr/?aModele=afficheN&cpsidt=24332111 [article] Amorphous titania-coated magnetite spherical nanoparticles : sonochemical synthesis and catalytic degradation of nonylphenol ethoxylate [texte imprimé] / Sambandam Anandan, Auteur ; Gang-Juan Lee, Auteur ; Shu-Han Hsieh, Auteur . - 2011 . - pp. 7874–7881. Chimie industrielle Langues : Anglais (eng) in Industrial & engineering chemistry research > Vol. 50 N° 13 (Juillet 2011) . - pp. 7874–7881 Mots-clés : Catalytic reaction Sonochemical Nanoparticle Résumé : Well-defined magnetically separable, amorphous titania-coated magnetite spherical nanoparticles were successfully synthesized by a sonochemical method using 20 kHz ultrasound. Amorphous magnetite particles were generated by the pyrolysis of Fe(CO)5 within the cavitation bubbles. The simultaneous formation of titania particles from titanium isopropoxide in the bulk liquid led to the incorporation of the magnetite nanoparticles into the titania particles. Transmission electron microscopy images of the titania-coated magnetite nanoparticles showed that they were relatively uniform in size with an average size of 150 nm. The M–H hysteresis loop for titania-coated magnetite particles indicated that the composite spherical nanospheres exhibit superparamagnetic characteristics at room temperature. The titania-coated magnetite nanoparticles were found to be useful for the removal of a wastewater pollutant (nonylphenol ethoxylate) by a combined process of heterogeneous catalysis and ozonation. DEWEY : 660 ISSN : 0888-5885 En ligne : http://cat.inist.fr/?aModele=afficheN&cpsidt=24332111

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Removal of orange II dye in water by visible light assisted photocatalytic ozonation using Bi2O3 and Au /Bi2O3 nanorods / Sambandam Anandan in Industrial & engineering chemistry research, Vol. 49 N° 20 (Octobre 2010)  

Public ISBD [article]  inIndustrial & engineering chemistry research > Vol. 49 N° 20 (Octobre 2010) . - pp. 9729–9737 Titre : Removal of orange II dye in water by visible light assisted photocatalytic ozonation using Bi2O3 and Au /Bi2O3 nanorods Type de document : texte imprimé Auteurs : Sambandam Anandan, Auteur ; Gang-Juan Lee, Auteur ; Pei-Kuan Chen, Auteur Année de publication : 2011 Article en page(s) : pp. 9729–9737 Note générale : Chimie industrielle Langues : Anglais (eng) Mots-clés : Ozonization Photocatalysis Visible radiation Dyes Résumé : This paper presents the results of visible light assisted photocatalytic ozonation and other related oxidation processes for the removal of Orange II dye from water using Bi2O3 and Au/Bi2O3 nanorods prepared using microwave irradiation which was found effective compared to Bi2O3 particles prepared by conventional heat treatment method at 90 °C. Particularly, in the photocatalytic ozonation using Au/Bi2O3 nanorods, a fourfold increase in the rate was observed as compared to that in the absence of Au/Bi2O3. This is because tuning semiconductor materials into nanosize could create high quantum confinement of electron and hole to increase the illumination efficiency. In addition, the deposition of nanomaterial can also be employed to enhance the mechanical strength of devices. That is, deposited Au nanoparticles act as electron traps to impede electron/hole recombination. DEWEY : 660 ISSN : 0888-5885 En ligne : http://cat.inist.fr/?aModele=afficheN&cpsidt=23325792 [article] Removal of orange II dye in water by visible light assisted photocatalytic ozonation using Bi2O3 and Au /Bi2O3 nanorods [texte imprimé] / Sambandam Anandan, Auteur ; Gang-Juan Lee, Auteur ; Pei-Kuan Chen, Auteur . - 2011 . - pp. 9729–9737. Chimie industrielle Langues : Anglais (eng) in Industrial & engineering chemistry research > Vol. 49 N° 20 (Octobre 2010) . - pp. 9729–9737 Mots-clés : Ozonization Photocatalysis Visible radiation Dyes Résumé : This paper presents the results of visible light assisted photocatalytic ozonation and other related oxidation processes for the removal of Orange II dye from water using Bi2O3 and Au/Bi2O3 nanorods prepared using microwave irradiation which was found effective compared to Bi2O3 particles prepared by conventional heat treatment method at 90 °C. Particularly, in the photocatalytic ozonation using Au/Bi2O3 nanorods, a fourfold increase in the rate was observed as compared to that in the absence of Au/Bi2O3. This is because tuning semiconductor materials into nanosize could create high quantum confinement of electron and hole to increase the illumination efficiency. In addition, the deposition of nanomaterial can also be employed to enhance the mechanical strength of devices. That is, deposited Au nanoparticles act as electron traps to impede electron/hole recombination. DEWEY : 660 ISSN : 0888-5885 En ligne : http://cat.inist.fr/?aModele=afficheN&cpsidt=23325792

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