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DatoValore
TitlePHOTOCATALYTIC DEGRADATION OF METHYL-RED BY TIO2: COMPARISON OF THE EFFICIENCY OF IMMOBILIZED NANOPARTICLES VS CONVENTIONAL SUSPENDED CATALYST
AbstractThe photocatalytic efficiency of supported TiO2 nanoparticles (mean size 6 nm), immobilized onto the inner walls of a cylindrical glass photoreactor was compared versus the performance of conventional TiO2 Degussa P25 catalyst. For this purpose the degradation of methyl red dye was used as evaluation test. The obtained results showed that the TiO2 Degussa P25 catalyst is more efficient than the supported nanoparticles. The poorer performance of the nanosized catalyst can be ascribed to the fact that the immobilization procedure turns out, in spite of the extremely high surface to volume ratio, in an overall reduction of active surface area available for target molecule adsorption, due to the low porosity of the supported catalyst layer. The kinetics of the investigated processes were monitored and a study on the reaction products and intermediates was carried out in order to evaluate possible difference in the reaction pathway in presence of immobilized nanoparticles versus suspended catalyst. The results demonstrate that the mechanisms of parent dye degradation in presence of supported TiO2 nanoparticles are the same as those occurring in presence of TiO2 Degussa P25 catalyst. The present work describe the results obtained on the feasibility of scaling up the colloidal nanocrystal-based photocatalysis experiment: the comparison with a well standardized degradation method performed with a known material can allow a realistic evaluation of the advantages and the limits of the investigated nanoparticle towards the ultimate technology transfer. © 2006 Elsevier B.V. All rights reserved.
SourceJournal of hazardous materials (Print) 142, pp. 130–137
JournalJournal of hazardous materials (Print)
EditorElsevier, New York ;, Paesi Bassi
Year2007
TypeArticolo in rivista
DOI10.1016/j.jhazmat.2006.07.068
AuthorsMASCOLO G., COMPARELLI R., CURRI M.L., LOVECCHIO G., LOPEZ A., AGOSTIANO A.
Text42145 2007 10.1016/j.jhazmat.2006.07.068 PHOTOCATALYTIC DEGRADATION OF METHYL RED BY TIO2 COMPARISON OF THE EFFICIENCY OF IMMOBILIZED NANOPARTICLES VS CONVENTIONAL SUSPENDED CATALYST MASCOLO G., COMPARELLI R., CURRI M.L., LOVECCHIO G., LOPEZ A., AGOSTIANO A. a Istituto di Ricerca Sulle Acque, Consiglio Nazionale delle Ricerche, Via F. De Blasio 5, I 70123 Bari, Italy b CNR IPCF, Bari Division c/o Dip. di Chimica, Universit`a di Bari, via Orabona 4, I 70126 Bari, Italy c Dipartimento di Chimica, Universit`a di Bari, via Orabona 4, I 70126 Bari, Italy The photocatalytic efficiency of supported TiO2 nanoparticles mean size 6 nm , immobilized onto the inner walls of a cylindrical glass photoreactor was compared versus the performance of conventional TiO2 Degussa P25 catalyst. For this purpose the degradation of methyl red dye was used as evaluation test. The obtained results showed that the TiO2 Degussa P25 catalyst is more efficient than the supported nanoparticles. The poorer performance of the nanosized catalyst can be ascribed to the fact that the immobilization procedure turns out, in spite of the extremely high surface to volume ratio, in an overall reduction of active surface area available for target molecule adsorption, due to the low porosity of the supported catalyst layer. The kinetics of the investigated processes were monitored and a study on the reaction products and intermediates was carried out in order to evaluate possible difference in the reaction pathway in presence of immobilized nanoparticles versus suspended catalyst. The results demonstrate that the mechanisms of parent dye degradation in presence of supported TiO2 nanoparticles are the same as those occurring in presence of TiO2 Degussa P25 catalyst. The present work describe the results obtained on the feasibility of scaling up the colloidal nanocrystal based photocatalysis experiment the comparison with a well standardized degradation method performed with a known material can allow a realistic evaluation of the advantages and the limits of the investigated nanoparticle towards the ultimate technology transfer. © 2006 Elsevier B.V. All rights reserved. 142 Photocatalytic degradation of methyl red by TiO2 Comparison of the efficiency of immobilized nanoparticles versus conventional suspended catalyst 2007_J_Haz_Mat.pdf Articolo in rivista Elsevier 0304 3894 Journal of hazardous materials Print Journal of hazardous materials Print J. hazard. mater. Print Journal of hazardous materials. Print antonio.lopez LOPEZ ANTONIO giuseppe.mascolo MASCOLO GIUSEPPE TA.P07.002.002 Sviluppo di nuovi processi di controllo dell inquinamento idrico.