Scheda di dettaglio – i prodotti della ricerca
| Dato | Valore |
|---|---|
| Title | UV-induced photocatalytic degradation of azo dyes by organic-capped ZnO nanocrystals immobilized onto substrates |
| Abstract | ZnO nanocrystals (mean particle size: 6 nm) with different surface organic coating and commercial ZnO powder (mean particle size: 200 nm) have been immobilized onto transparent substrates and comparatively examined as photocatalysts for the UV-induced degradation of two azo dyes, Methyl Red and Methyl Orange, in water. The effects of the pH, of the catalyst surface status, and of the dye chemical structure on the course of the photocatalysis are discussed. Reasonable degradation pathways for both target molecules are proposed on the basis of the structural identification of several by-products. The results demonstrate that surfactant-capped ZnO nanocrystals exhibit more versatile performances than those of conventional ZnO-based photocatalysts, because the surface organic coating makes the oxide resistant to photocorrosion and to pH changes. Surface-protected ZnO nanocrystals can be regarded as a valuable alternative to standard TiO2 photocatalysts. |
| Source | Applied catalysis. B, Environmental (Print) 60, pp. 1–11 |
| Journal | Applied catalysis. B, Environmental (Print) |
| Editor | Elsevier, Amsterdam ;, Paesi Bassi |
| Year | 2005 |
| Type | Articolo in rivista |
| Authors | COMPARELLI R., FANIZZA E., CURRI M.L., COZZOLI P.D., MASCOLO G., AGOSTIANO A. |
| Text | 167544 2005 UV induced photocatalytic degradation of azo dyes by organic capped ZnO nanocrystals immobilized onto substrates COMPARELLI R., FANIZZA E., CURRI M.L., COZZOLI P.D., MASCOLO G., AGOSTIANO A. Dipartimento di Chimica, Universita` di Bari, via Orabona 4, I 70126 Bari, Italy b CNR IPCF Sez Bari c/o Dip. di Chimica, Universita` di Bari, via Orabona 4, I 70126 Bari, Italy c CNR IRSA Sez. Bari, Via F. De Blasio 5, I 70123 Bari, Italy ZnO nanocrystals mean particle size 6 nm with different surface organic coating and commercial ZnO powder mean particle size 200 nm have been immobilized onto transparent substrates and comparatively examined as photocatalysts for the UV induced degradation of two azo dyes, Methyl Red and Methyl Orange, in water. The effects of the pH, of the catalyst surface status, and of the dye chemical structure on the course of the photocatalysis are discussed. Reasonable degradation pathways for both target molecules are proposed on the basis of the structural identification of several by products. The results demonstrate that surfactant capped ZnO nanocrystals exhibit more versatile performances than those of conventional ZnO based photocatalysts, because the surface organic coating makes the oxide resistant to photocorrosion and to pH changes. Surface protected ZnO nanocrystals can be regarded as a valuable alternative to standard TiO2 photocatalysts. 60 UV induced photocatalytic degradation of azo dyes by organic capped ZnO nanocrystals immobilized onto substrates Comparelli_et_al_Appl_Cat_B_II_2005.pdf Articolo in rivista Elsevier 0926 3373 Applied catalysis. B, Environmental Print Applied catalysis. B, Environmental Print Appl. catal., B Environ. Print Applied catalysis. Print roberto.comparelli COMPARELLI ROBERTO FANIZZA ELISABETTA marialucia.curri CURRI MARIA LUCIA giuseppe.mascolo MASCOLO GIUSEPPE MD.P01.011.001 Strutture ad alta organizzazione gerarchica realizzate mediante approcci di tipo biologico e chimico, per lo studio e la progettazione di materiali e sistemi ibridi di interesse fotochimico TA.P07.002.002 Sviluppo di nuovi processi di controllo dell inquinamento idrico. |