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Titolo:
Preparation characterization and photocatalytic activity of polycrystalline ZnO/TiO2 systems. 2. Surface, bulk characterization, and 4-nitrophenol photodegradation in liquid-solid regime
Autore:
Marci, G; Augugliaro, V; Lopez-Munoz, MJ; Martin, C; Palmisano, L; Rives, V; Schiavello, M; Tilley, RJD; Venezia, AM;
Indirizzi:
Univ Palermo, Dipartimento Ingn Chim Proc & Mat, I-90128 Palermo, Italy Univ Palermo Palermo Italy I-90128 im Proc & Mat, I-90128 Palermo, Italy Univ Rey Juan Carlos, Escuela Super Ciencias Expt & Tecnol, Madrid 28933, Spain Univ Rey Juan Carlos Madrid Spain 28933 pt & Tecnol, Madrid 28933, Spain Univ Salamanca, Dept Quim Inorgan, E-37008 Salamanca, Spain Univ Salamanca Salamanca Spain E-37008 Inorgan, E-37008 Salamanca, Spain Univ Wales, Sch Engn, Div Mat Engn, Cardiff CF2 1XH, S Glam, Wales Univ Wales Cardiff S Glam Wales CF2 1XH n, Cardiff CF2 1XH, S Glam, Wales CNR, ICTPN, I-90100 Palermo, Italy CNR Palermo Italy I-90100CNR, ICTPN, I-90100 Palermo, Italy
Titolo Testata:
JOURNAL OF PHYSICAL CHEMISTRY B
fascicolo: 5, volume: 105, anno: 2001,
pagine: 1033 - 1040
SICI:
1520-6106(20010208)105:5<1033:PCAPAO>2.0.ZU;2-7
Fonte:
ISI
Lingua:
ENG
Soggetto:
ELECTRON-SPIN-RESONANCE; TITANIUM-DIOXIDE; COUPLED SEMICONDUCTORS; PARTICULATE SYSTEMS; TIO2 CATALYSTS; AQUEOUS-MEDIUM; SOLAR-ENERGY; ZINC-OXIDES; DECOMPOSITION; DEGRADATION;
Tipo documento:
Article
Natura:
Periodico
Settore Disciplinare:
Physical, Chemical & Earth Sciences
Citazioni:
53
Recensione:
Indirizzi per estratti:
Indirizzo: Palmisano, L Univ Palermo, Dipartimento Ingn Chim Proc & Mat, Viale Sci, I-90128 Palermo, Italy Univ Palermo Viale Sci Palermo Italy I-90128 Palermo, Italy
Citazione:
G. Marci et al., "Preparation characterization and photocatalytic activity of polycrystalline ZnO/TiO2 systems. 2. Surface, bulk characterization, and 4-nitrophenol photodegradation in liquid-solid regime", J PHYS CH B, 105(5), 2001, pp. 1033-1040

Abstract

Electron spin resonance spectroscopy (ESR), Fourier transform infrared spectroscopy (FTIR), and monitoring of pyridine (py) and boric acid trimethyl ester (BATE) adsorption for determining surface acidity and basicity, respectively, were used to carry out further characterization of mixed ZnO/TiO2 polycrystalline solids prepared by different methods. Moreover, the powderswere tested in a batch photoreactor for a probe reaction, i.e., 4-nitrophenol photodegradation in aqueous medium. ESR results indicated the presence of signals attributable to Zn+ species in ZnO/TiO2 (anatase) solids, while in ZnO/TiO2 (rutile) samples the presence of zinc induced only the formation of signals probably due to Ti3+ centers. FT-IR spectra showed no significant differences of the surface hydroxylation degree of the various photocatalysts, whereas the surface acidic properties generally decrease by increasing the amount of ZnO, Coupling of ZnO and TiO2 semiconducting powders was not so beneficial, as expected on the basis of the intrinsic electronic properties, to enhance the photoreactivity for the studied reaction, although some of the powders showed photoactivities slightly higher than those of bare TiO2 and ZnO. Nevertheless, some of the samples (the mixed particles ZnO/TiO2 (rutile)) appear promising from an application point of view because no filtration tvas needed after the occurrence of the photoreactivity teststo separate them from the solution because they decanted easily. The mineralization of 4-nitrophenol was checked by determining the total organic carbon (TOC) and a complete photooxidation occurred in few hours in the presence of some of the samples.

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Documento generato il 03/04/20 alle ore 04:31:12