Details

Autor(en) / Beteiligte

• Bettini, Luca Giacomo
• Dozzi, Maria Vittoria
• Foglia, Flavio Della
• Chiarello, Gian Luca
• Selli, Elena
• Lenardi, Cristina
• Piseri, Paolo
• Milani, Paolo

Titel

Mixed-phase nanocrystalline TiO sub(2) photocatalysts produced by flame spray pyrolysis

Ist Teil von

• Applied catalysis. B, Environmental, 2015-11, Vol.178, p.226-232

Erscheinungsjahr

2015

Quelle

Alma/SFX Local Collection

Beschreibungen/Notizen

• Titanium dioxide nanostructured powders with different structural properties and improved photocatalytic performance were synthesized by flame spray pyrolysis (FSP) under systematically varied FSP operation conditions, starting from organic solutions containing titanium(IV) isopropoxide (TTIP) as Ti precursor. The primary particle size, crystalline phase, specific surface area, porosity and morphology of the so obtained photocatalyst powders were investigated by means of Raman spectroscopy, XRD, BET, SEM and UV-vis absorption analysis. An increase of the molar ratio between the dispersion oxygen gas and the TTIP fed into the flame was demonstrated to lead to TiO sub(2) materials with decreased primary particles size, from ca. 21 to 7 nm, with a higher brookite content and an increased BET surface area, from ca. 70 up to 250 m super(2) g super(-1). The photocatalytic activity of the as-synthesized TiO sub(2) powders was investigated employing formic acid decomposition in aqueous suspension as test reaction. With the TiO sub(2) powders synthesized with high O sub(2)/TTIP flux molar ratio a formic acid photomineralization rate was attained significantly overcoming that obtained with commercial P25 TiO sub(2).