Titanium dioxide is the most popular photocatalyst to degrade organic pollutants in air, as well as in water. The principal drawback preventing its commercial application lies in its limited absorption of the visible light (400–700 nm), while it is active under UV irradiation (≤387 nm). Supporting noble metals in the form of nanoparticles on TiO2 increases its activity in the visible range. However, both the synthesis of noble metal nanoparticles and their deposition on TiO2 are multi-step processes that often require organic solvents. Here, we deposit Ag nanoparticles from AgNO3 on the surface of micrometric TiO2 with H2O as a solvent and under ultrasound irradiation at 30 W cm−2. Ultrasound increases the surface amount of Ag on TiO2 with heterogeneous size distribution of Ag nanoparticles, which are bigger and overlaid (1–20 nm vs. 0.5–3 nm) compared to the sample obtained in traditional conditions (TEM images). While this change in morphology had no effect on acetone photodegradation under UV light, the 5%, 10%, and 20% Ag-TiO2 degraded 17%, 20% and 24% acetone under visible light, respectively. The 10% by weight Ag-TiO2 sample obtained in absence of ultrasound only degraded 14% acetone in 6 h, while the bare TiO2 was not active.

Ultrasound assisted synthesis of Ag-decorated TiO2 active in visible light

Cerrato, G.;
2018

Abstract

Titanium dioxide is the most popular photocatalyst to degrade organic pollutants in air, as well as in water. The principal drawback preventing its commercial application lies in its limited absorption of the visible light (400–700 nm), while it is active under UV irradiation (≤387 nm). Supporting noble metals in the form of nanoparticles on TiO2 increases its activity in the visible range. However, both the synthesis of noble metal nanoparticles and their deposition on TiO2 are multi-step processes that often require organic solvents. Here, we deposit Ag nanoparticles from AgNO3 on the surface of micrometric TiO2 with H2O as a solvent and under ultrasound irradiation at 30 W cm−2. Ultrasound increases the surface amount of Ag on TiO2 with heterogeneous size distribution of Ag nanoparticles, which are bigger and overlaid (1–20 nm vs. 0.5–3 nm) compared to the sample obtained in traditional conditions (TEM images). While this change in morphology had no effect on acetone photodegradation under UV light, the 5%, 10%, and 20% Ag-TiO2 degraded 17%, 20% and 24% acetone under visible light, respectively. The 10% by weight Ag-TiO2 sample obtained in absence of ultrasound only degraded 14% acetone in 6 h, while the bare TiO2 was not active.
ULTRASONICS SONOCHEMISTRY
40
Pt A
282
288
www.elsevier.com/inca/publications/store/5/2/5/4/5/1
Ag-TiO2, Ultrasound, One-step deposition, Ag nanoparticles, Visible light photocatalysis, Micrometric TiO2
Stucchi, M.; Bianchi, C.L.; Argirusis, C.; Pifferi, V.; Neppolian, B.; Cerrato, G.; Boffito, D.C.
File in questo prodotto:
File Dimensione Formato  
UltrasSonoc_2018_Ag-TiO2 active in visible light.pdf

non disponibili

Descrizione: pdf editoriale
Tipo di file: PDF EDITORIALE
Dimensione 766.29 kB
Formato Adobe PDF
766.29 kB Adobe PDF   Visualizza/Apri   Richiedi una copia
Ultrasound Ag_final version.pdf

embargo fino al 10/07/2019

Descrizione: file postprint
Tipo di file: POSTPRINT (VERSIONE FINALE DELL’AUTORE)
Dimensione 1.78 MB
Formato Adobe PDF
1.78 MB Adobe PDF Visualizza/Apri

I documenti in IRIS sono protetti da copyright e tutti i diritti sono riservati, salvo diversa indicazione.

Utilizza questo identificativo per citare o creare un link a questo documento: http://hdl.handle.net/2318/1668857
Citazioni
  • ???jsp.display-item.citation.pmc??? 9
  • Scopus 62
  • ???jsp.display-item.citation.isi??? 61
social impact