The increasing interest for addressing photocatalyst materials towards an effective application with sunlight is an important topic in materials science. We present here a novel investigation of tungsten trioxide (WO3) coatings fabricated by pulsed laser deposition (PLD) with the aim of providing a nanostructured photocatalyst capable of working with concentrated sunlight and exhibiting good stability in acidic environment. This is important since: (1) acidic pH is common in industrial wastewaters and (2) acidic pH is also known to enhance photo-Fenton reactions. Samples produced by PLD were deposited on glass slides with area of 19 cm2 and then thermally annealed at different temperatures (200, 400 and 600 °C) for 8 h to investigate the growth mechanism of WO3. Material characterization was performed by scanning electron microscopy (SEM), X-Ray diffraction (XRD) and micro-Raman, revealing the growth of a crystalline monoclinic phase of WO3 with a highly structured surface featuring nanoflakes in a flower-shape like structure with an energy bandgap of 2.6 eV. To study its photocatalytic properties, the catalyst annealed at the temperature of 600 °C evolved into a complete WO3 oxide presenting monoclinic phase and was investigated under labscale artificial visible light in both direct photocatalysis and in presence of H2O2 as a radical source (photo-Fenton-like process) using 10 ppm solutions of the Methylene Blue (MB) dye as a model pollutant. The study was then replicated in higher volume scale under concentrated solar light from a parabolic dish concentrator (PDC) apparatus to demonstrate application. Results highlighted high surface adsorption of 15%, 54% total MB degradation on direct photocatalysis and 85% in the photo-Fenton-like mode after 120 min of experiment.

Pulsed laser deposition of nanostructured tungsten oxide films: A catalyst for water remediation with concentrated sunlight / Fendrich, Murilo; Popat, Yaksh; Orlandi, Michele; Quaranta, Alberto; Miotello, Antonio. - In: MATERIALS SCIENCE IN SEMICONDUCTOR PROCESSING. - ISSN 1369-8001. - 119:(2020), p. 105237. [10.1016/j.mssp.2020.105237]

Pulsed laser deposition of nanostructured tungsten oxide films: A catalyst for water remediation with concentrated sunlight

Fendrich, Murilo;Popat, Yaksh;Orlandi, Michele;Quaranta, Alberto;Miotello, Antonio
2020-01-01

Abstract

The increasing interest for addressing photocatalyst materials towards an effective application with sunlight is an important topic in materials science. We present here a novel investigation of tungsten trioxide (WO3) coatings fabricated by pulsed laser deposition (PLD) with the aim of providing a nanostructured photocatalyst capable of working with concentrated sunlight and exhibiting good stability in acidic environment. This is important since: (1) acidic pH is common in industrial wastewaters and (2) acidic pH is also known to enhance photo-Fenton reactions. Samples produced by PLD were deposited on glass slides with area of 19 cm2 and then thermally annealed at different temperatures (200, 400 and 600 °C) for 8 h to investigate the growth mechanism of WO3. Material characterization was performed by scanning electron microscopy (SEM), X-Ray diffraction (XRD) and micro-Raman, revealing the growth of a crystalline monoclinic phase of WO3 with a highly structured surface featuring nanoflakes in a flower-shape like structure with an energy bandgap of 2.6 eV. To study its photocatalytic properties, the catalyst annealed at the temperature of 600 °C evolved into a complete WO3 oxide presenting monoclinic phase and was investigated under labscale artificial visible light in both direct photocatalysis and in presence of H2O2 as a radical source (photo-Fenton-like process) using 10 ppm solutions of the Methylene Blue (MB) dye as a model pollutant. The study was then replicated in higher volume scale under concentrated solar light from a parabolic dish concentrator (PDC) apparatus to demonstrate application. Results highlighted high surface adsorption of 15%, 54% total MB degradation on direct photocatalysis and 85% in the photo-Fenton-like mode after 120 min of experiment.
2020
Fendrich, Murilo; Popat, Yaksh; Orlandi, Michele; Quaranta, Alberto; Miotello, Antonio
Pulsed laser deposition of nanostructured tungsten oxide films: A catalyst for water remediation with concentrated sunlight / Fendrich, Murilo; Popat, Yaksh; Orlandi, Michele; Quaranta, Alberto; Miotello, Antonio. - In: MATERIALS SCIENCE IN SEMICONDUCTOR PROCESSING. - ISSN 1369-8001. - 119:(2020), p. 105237. [10.1016/j.mssp.2020.105237]
File in questo prodotto:
File Dimensione Formato  
1-s2.0-S1369800120311720-main.pdf

Solo gestori archivio

Tipologia: Versione editoriale (Publisher’s layout)
Licenza: Tutti i diritti riservati (All rights reserved)
Dimensione 2.68 MB
Formato Adobe PDF
2.68 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: https://hdl.handle.net/11572/268947
Citazioni
  • ???jsp.display-item.citation.pmc??? ND
  • Scopus 11
  • ???jsp.display-item.citation.isi??? 9
social impact