Documents disponibles écrits par cet auteur

Enhanced photocatalytic activity by silver metal ion exchanged naY zeolite photocatalysts for the degradation of organic contaminants and dyes in aqueous medium / Rajesh J. Tayade in Industrial & engineering chemistry research, Vol. 47 N°20 (Octobre 2008) 

Public ISBD [article]  in Industrial & engineering chemistry research > Vol. 47 N°20 (Octobre 2008) . - P. 7545-7551 Titre : Enhanced photocatalytic activity by silver metal ion exchanged naY zeolite photocatalysts for the degradation of organic contaminants and dyes in aqueous medium Type de document : texte imprimé Auteurs : Rajesh J. Tayade, Editeur scientifique ; Praveen K. Surolia, Editeur scientifique ; Manoj Lazar, Editeur scientifique Année de publication : 2008 Article en page(s) : P. 7545-7551 Note générale : Chemical engineering Langues : Anglais (eng) Mots-clés : Photocatalytic  Zeolite-based  photocatalyst  X-ray  diffraction  (XRD)  Scanning  electron  microscopy  (SEM)  TiO2 Résumé : Zeolite-based photocatalyst have been prepared using TiO2-coated NaY zeolite by post-synthesis modification with silver metal ion exchange. The characterization of the catalysts was carried out by X-ray diffraction (XRD), scanning electron microscopy (SEM), Inductively coupled plasma-optical emission spectrophotometry (ICP), Diffuse reflectance spectroscopy (DRS), Fourier transform infrared spectroscopy (FTIR), and N2 adsorption techniques. The presence of metal ions and TiO2 on zeolite surface was observed by UV-visible diffuse reflectance spectroscopy. It was found that the structure of the support materials is retained after the silver metal ion exchange. The photocatalytic activity of the catalysts was studied by degradation of aqueous nitrobenzene, acetophenone, methylene blue, and malachite green in the presence of UV light. The highest photocatalytic activity was obtained for silver metal ion exchanged photocatalysts coated with TiO2 (2%, w/w) as compared to other silver exchanged NaY zeolite catalysts. This study demonstrated that the Ag metal ion exchanged TiO2-coated NaY is a better catalyst as compared to the TiO2-coated NaY photocatalysts. En ligne : http://pubs.acs.org/doi/abs/10.1021/ie800441c [article] Enhanced photocatalytic activity by silver metal ion exchanged naY zeolite photocatalysts for the degradation of organic contaminants and dyes in aqueous medium [texte imprimé] / Rajesh J. Tayade, Editeur scientifique ; Praveen K. Surolia, Editeur scientifique ; Manoj Lazar, Editeur scientifique . - 2008 . - P. 7545-7551. Chemical engineering Langues : Anglais (eng) in Industrial & engineering chemistry research > Vol. 47 N°20 (Octobre 2008) . - P. 7545-7551 Mots-clés : Photocatalytic  Zeolite-based  photocatalyst  X-ray  diffraction  (XRD)  Scanning  electron  microscopy  (SEM)  TiO2 Résumé : Zeolite-based photocatalyst have been prepared using TiO2-coated NaY zeolite by post-synthesis modification with silver metal ion exchange. The characterization of the catalysts was carried out by X-ray diffraction (XRD), scanning electron microscopy (SEM), Inductively coupled plasma-optical emission spectrophotometry (ICP), Diffuse reflectance spectroscopy (DRS), Fourier transform infrared spectroscopy (FTIR), and N2 adsorption techniques. The presence of metal ions and TiO2 on zeolite surface was observed by UV-visible diffuse reflectance spectroscopy. It was found that the structure of the support materials is retained after the silver metal ion exchange. The photocatalytic activity of the catalysts was studied by degradation of aqueous nitrobenzene, acetophenone, methylene blue, and malachite green in the presence of UV light. The highest photocatalytic activity was obtained for silver metal ion exchanged photocatalysts coated with TiO2 (2%, w/w) as compared to other silver exchanged NaY zeolite catalysts. This study demonstrated that the Ag metal ion exchanged TiO2-coated NaY is a better catalyst as compared to the TiO2-coated NaY photocatalysts. En ligne : http://pubs.acs.org/doi/abs/10.1021/ie800441c

Photocatalytic degradation of nitrobenzene in an aqueous system by transition-metal-exchanged ETS-10 zeolites / Praveen K. Surolia in Industrial & engineering chemistry research, Vol. 49 N° 8 (Avril 2010) 

Public ISBD [article]  in Industrial & engineering chemistry research > Vol. 49 N° 8 (Avril 2010) . - pp 3961–3966 Titre : Photocatalytic degradation of nitrobenzene in an aqueous system by transition-metal-exchanged ETS-10 zeolites Type de document : texte imprimé Auteurs : Praveen K. Surolia, Auteur ; Rajesh J. Tayade, Auteur ; Raksh V. Jasra, Auteur Année de publication : 2010 Article en page(s) : pp 3961–3966 Note générale : Industrial Chemistry Langues : Anglais (eng) Mots-clés : Photocatalytic  Nitrobenzene  Nitrobenzene  Metal-Exchanged  Zeolites Résumé : Engelhard titanosilicate ETS-10 was synthesized using Degussa P25 as the titanium source. Metal-exchanged microporous titanium silicate M−ETS-10 (M = Fe, Co, Ni, Cu, and Ag) samples were prepared by ion exchange with respective metal salt solutions. The synthesized samples were characterized by powder X-ray diffraction, BET surface area, thermogravimetric analysis (TGA), scanning electron microscopy (SEM), and UV−vis diffuse reflectance measurements (DRS). The photocatalytic activity of these samples was investigated for the decomposition of nitrobenzene (NB). The pristine ETS-10 and transition-metal-ion-exchanged ETS-10 samples were found to be active photocatalysts that can decompose nitrobenzene under UV irradiation. Results demonstrated that silver-ion-exchanged ETS-10 shows the highest photocatalytic activity for degradation and mineralization of nitrobenzene. ISSN : 0888-5885 En ligne : http://pubs.acs.org/doi/abs/10.1021/ie901603k [article] Photocatalytic degradation of nitrobenzene in an aqueous system by transition-metal-exchanged ETS-10 zeolites [texte imprimé] / Praveen K. Surolia, Auteur ; Rajesh J. Tayade, Auteur ; Raksh V. Jasra, Auteur . - 2010 . - pp 3961–3966. Industrial Chemistry Langues : Anglais (eng) in Industrial & engineering chemistry research > Vol. 49 N° 8 (Avril 2010) . - pp 3961–3966 Mots-clés : Photocatalytic  Nitrobenzene  Nitrobenzene  Metal-Exchanged  Zeolites Résumé : Engelhard titanosilicate ETS-10 was synthesized using Degussa P25 as the titanium source. Metal-exchanged microporous titanium silicate M−ETS-10 (M = Fe, Co, Ni, Cu, and Ag) samples were prepared by ion exchange with respective metal salt solutions. The synthesized samples were characterized by powder X-ray diffraction, BET surface area, thermogravimetric analysis (TGA), scanning electron microscopy (SEM), and UV−vis diffuse reflectance measurements (DRS). The photocatalytic activity of these samples was investigated for the decomposition of nitrobenzene (NB). The pristine ETS-10 and transition-metal-ion-exchanged ETS-10 samples were found to be active photocatalysts that can decompose nitrobenzene under UV irradiation. Results demonstrated that silver-ion-exchanged ETS-10 shows the highest photocatalytic activity for degradation and mineralization of nitrobenzene. ISSN : 0888-5885 En ligne : http://pubs.acs.org/doi/abs/10.1021/ie901603k

TiO2 - coated cenospheres as catalysts for photocatalytic degradation of methylene blue, p - nitroaniline, n - decane, and n - tridecane under solar irradiation / Praveen K. Surolia in Industrial & engineering chemistry research, Vol. 49 N° 19 (Octobre 2010) 

Public ISBD [article]  in Industrial & engineering chemistry research > Vol. 49 N° 19 (Octobre 2010) . - pp. 8908–8919 Titre : TiO2 - coated cenospheres as catalysts for photocatalytic degradation of methylene blue, p - nitroaniline, n - decane, and n - tridecane under solar irradiation Type de document : texte imprimé Auteurs : Praveen K. Surolia, Auteur ; Rajesh J. Tayade, Auteur ; Raksh V. Jasra, Auteur Année de publication : 2010 Article en page(s) : pp. 8908–8919 Note générale : Chimie industrielle Langues : Anglais (eng) Mots-clés : Catalysts  Photocatalytic  degradation Résumé : Fly ash cenosphere particles generated in coal-fired thermal power plants were coated with TiO2 using the sol−gel technique. Thus prepared photocatalysts were used for the degradation of methylene blue (MB), nitro-aromatic compound p-nitroaniline (PNA), and photocatalytic oxidation of n-decane and n-tridecane from aqueous solution under solar light irradiation. The morphology, composition, and crystallinity of both pristine and TiO2-coated cenospheres were studied. The UV−visible spectroscopic analysis was used to monitor the progress of the reaction for MB and PNA. The decrease in the amount of n-decane and n-tridecane was determined by gas chromatographic analysis. The decrease in the concentration for a 25 ppm initial concentration of MB and PNA was observed to be 99 and 26%, respectively, after 3 h of reaction time. This demonstrates that MB is more amenable toward degradation and mineralization as it acts as a sensitizer. Decreases up to 51 and 36% for n-decane and n-tridecane were observed with initial amounts of 3−12 mL, respectively, after 6 h. The coated cenosphere catalyst could be recovered by filtration and reused. The coating was found to be stable even after three uses of the catalyst in the photocatalytic degradation reaction of MB and PNA. The mineralization of dye and nitro-aromatic compound was confirmed by the chemical oxygen demand analysis. Cenospheres, because of their light weight, would make the catalyst particles float on the aqueous surface and hence could be directly activated by sunlight. ISSN : 0888-5885 En ligne : http://pubs.acs.org/doi/abs/10.1021/ie100388m [article] TiO2 - coated cenospheres as catalysts for photocatalytic degradation of methylene blue, p - nitroaniline, n - decane, and n - tridecane under solar irradiation [texte imprimé] / Praveen K. Surolia, Auteur ; Rajesh J. Tayade, Auteur ; Raksh V. Jasra, Auteur . - 2010 . - pp. 8908–8919. Chimie industrielle Langues : Anglais (eng) in Industrial & engineering chemistry research > Vol. 49 N° 19 (Octobre 2010) . - pp. 8908–8919 Mots-clés : Catalysts  Photocatalytic  degradation Résumé : Fly ash cenosphere particles generated in coal-fired thermal power plants were coated with TiO2 using the sol−gel technique. Thus prepared photocatalysts were used for the degradation of methylene blue (MB), nitro-aromatic compound p-nitroaniline (PNA), and photocatalytic oxidation of n-decane and n-tridecane from aqueous solution under solar light irradiation. The morphology, composition, and crystallinity of both pristine and TiO2-coated cenospheres were studied. The UV−visible spectroscopic analysis was used to monitor the progress of the reaction for MB and PNA. The decrease in the amount of n-decane and n-tridecane was determined by gas chromatographic analysis. The decrease in the concentration for a 25 ppm initial concentration of MB and PNA was observed to be 99 and 26%, respectively, after 3 h of reaction time. This demonstrates that MB is more amenable toward degradation and mineralization as it acts as a sensitizer. Decreases up to 51 and 36% for n-decane and n-tridecane were observed with initial amounts of 3−12 mL, respectively, after 6 h. The coated cenosphere catalyst could be recovered by filtration and reused. The coating was found to be stable even after three uses of the catalyst in the photocatalytic degradation reaction of MB and PNA. The mineralization of dye and nitro-aromatic compound was confirmed by the chemical oxygen demand analysis. Cenospheres, because of their light weight, would make the catalyst particles float on the aqueous surface and hence could be directly activated by sunlight. ISSN : 0888-5885 En ligne : http://pubs.acs.org/doi/abs/10.1021/ie100388m