Hydrophilicity and surface heterogeneity of TiO2-doped silica materials for membrane applications
Articolo
Data di Pubblicazione:
2016
Abstract:
Silica materials containing different amount of titania (namely from 0 to 33%) were prepared, characterized
and tested to evaluate their hydrophilic features in order to design a good membrane material for
water purification. XRD, HRTEM, nitrogen gas-volumetric adsorption at 77 K were applied to obtain a
complete structural and morphological description of the systems. Material stability in alkaline solutions
was clearly enhanced by adding TiO2 to the silica material. Adsorption microcalorimetry and microgravimetric
measurements were used to study water and toluene adsorption, respectively, in order to
assess the hydrophilic and hydrophobic behaviors of the materials using polar (water) and non-polar
(toluene) probe molecules. Microcalorimetric data allowed to describe also the energetic features of
the water adsorption giving interesting information on the microscopic environment of the adsorption
sites. The analysis procedure applied in this study can constitute a valid approach to determine a priori
the behaviors of membrane materials.
Tipologia CRIS:
03A-Articolo su Rivista
Keywords:
Chemical stability; Hydrophilicity; Membrane material; Microcalorimetry; Water adsorption; Materials Science (all); Mechanics of Materials; Chemistry (all); Condensed Matter Physics
Elenco autori:
Boffa, Vittorio*; Parmeggiani, Laura; Nielsen, Asbjørn Haaning; Magnacca, Giuliana
Link alla scheda completa:
Pubblicato in: