Water is a molecule always present in the reaction environment in photocatalytic and biomedical applications of TiO2 and a better understanding of its interaction with the surface of TiO2 nanoparticles is crucial to develop materials with improved performance. In this contribution, we first studied the nature and the surface structure of the exposed facets of three commercial TiO2 samples (i.e., TiO2 P25, SX001, and PC105) by electron microscopy and IR spectroscopy of adsorbed CO. The morphological information was then correlated with the water adsorption properties, investigated at the molecular level, moving from multilayers of adsorbed H2O to the monolayer, combining medium- and near-IR spectroscopies. Finally, we assessed in a quantitative way the surface hydration state at different water equilibrium pressures by microgravimetric measurements.

Morphology, surface structure and water adsorption properties of TiO2 nanoparticles: A comparison of different commercial samples

Mino L.;Santalucia R.;Cerrato G.;Spoto G.;Martra G.
2020

Abstract

Water is a molecule always present in the reaction environment in photocatalytic and biomedical applications of TiO2 and a better understanding of its interaction with the surface of TiO2 nanoparticles is crucial to develop materials with improved performance. In this contribution, we first studied the nature and the surface structure of the exposed facets of three commercial TiO2 samples (i.e., TiO2 P25, SX001, and PC105) by electron microscopy and IR spectroscopy of adsorbed CO. The morphological information was then correlated with the water adsorption properties, investigated at the molecular level, moving from multilayers of adsorbed H2O to the monolayer, combining medium- and near-IR spectroscopies. Finally, we assessed in a quantitative way the surface hydration state at different water equilibrium pressures by microgravimetric measurements.
25
20
4605
4617
CO adsorption; FT-IR spectroscopy; Lewis acidity; NIR spectroscopy; OH groups; Surface hydration
Mino L.; Negri C.; Santalucia R.; Cerrato G.; Spoto G.; Martra G.
File in questo prodotto:
File Dimensione Formato  
Molecules-2020_Cerrato.pdf

accesso aperto

Descrizione: pdf editoriale
Tipo di file: PDF EDITORIALE
Dimensione 3.22 MB
Formato Adobe PDF
3.22 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/2318/1768523
Citazioni
  • ???jsp.display-item.citation.pmc??? 4
  • Scopus 13
  • ???jsp.display-item.citation.isi??? 11
social impact