Synthesis of TiO2 photocatalysts in supercritical CO2 via a non-hydrolytic route.
Nanoscaled TiO2 powders with narrow size dispersion were prepared in supercritical carbon dioxide via non-hydrolytic acylation/deacylation of titanium alkoxide precursors with or without tris-fluorination. The microstructures of these powders were characterized by spectroscopic (FTIR, TGA, and XRD), microscopic (SEM or TEM), and surface area (BET) measurements. Photocatalytic oxidation of 1-octanol on these calcined TiO2 powders and on commercial T805 TiO2 suspended in aerated supercritical carbon dioxide revealed relative reactivity controlled by the powder microstructures. Calcined TiO2 prepared from titanium(IV) isopropoxide and trifluoroacetic anhydride was effectively dispersed in aerated supercritical carbon dioxide under stirring and exhibited high photocatalytic oxidation activity.
Guo
Guangqing
G
Department of Chemistry, North Carolina State University, Raleigh, North Carolina 27606, USA.
Whitesell
James K
JK
Fox
Marye Anne
MA
D020003:1-Octanol / Q000737:chemistry / Q000528:radiation effects; D000089:Acetic Anhydrides; D002245:Carbon Dioxide / Q000737:chemistry*; D002384:Catalysis; D005463:Fluoroacetates; D008027:Light; D049329:Nanostructures / Q000737:chemistry / Q000528:radiation effects; D009942:Organometallic Compounds; D010084:Oxidation-Reduction; D010316:Particle Size; D010777:Photochemistry; D011312:Pressure; D013499:Surface Properties; D013997:Time Factors; D014025:Titanium / Q000737:chemistry* / Q000528:radiation effects; D014269:Trifluoroacetic Acid / Q000737:chemistry
D000089:Acetic Anhydrides; D005463:Fluoroacetates; D009942:Organometallic Compounds; D002245:Carbon Dioxide; C009495:titanium dioxide; C017958:trifluoroacetic anhydride; C102815:titanium isopropoxide; D014025:Titanium; D014269:Trifluoroacetic Acid; D020003:1-Octanol