Photocatalytic decomposition of perfluorooctanoic acid by iron and niobium co-doped titanium dioxide.
The photocatalytic decomposition of perfluorooctanoic acid (PFOA) in aqueous solution using Fe and Nb co-doped TiO(2) (Fe:Nb-TiO(2)) prepared by sol-gel method was investigated. The photocatalytic activity of Fe:Nb-TiO(2) towards PFOA degradation was compared to that of pure TiO(2) synthesized using the same method, and that of the commercially available TiO(2) photocatalyst, Aeroxide TiO(2) P25 (AO-TiO(2) P25). The photocatalysts were characterized by XRD, DRS, BET-N(2) adsorption isotherm, and SEM-EDX techniques and the data were correlated to the photocatalytic activity. Fe:Nb-TiO(2) showed the highest activity compared to the undoped TiO(2) and the commercially available TiO(2). Such activity was attributable to the effects of co-doping both on the physico-chemical properties and surface interfacial charge transfer mechanisms. Perfluorocarboxylic acids (PFCAs) with shorter carbon chain length and fluoride ions were identified as photocatalytic reaction intermediates and products.
Department of International Development Engineering, Tokyo Institute of Technology, 2-12-1 Ookayama, Meguro-ku, Tokyo 152-8550, Japan. mjhuertas@us.es
Carl Renan
CR
Estrellan
Chris
C
Salim
Hirofumi
H
Hinode
D002210:Caprylates / Q000737:chemistry*; D002384:Catalysis; D005466:Fluorocarbons / Q000737:chemistry*; D008401:Gas Chromatography-Mass Spectrometry; D007202:Indicators and Reagents; D007501:Iron / Q000737:chemistry*; D009556:Niobium / Q000737:chemistry*; D010777:Photochemistry; D012996:Solutions; D014025:Titanium / Q000737:chemistry*; D014961:X-Ray Diffraction
D002210:Caprylates; D005466:Fluorocarbons; D007202:Indicators and Reagents; D012996:Solutions; D009556:Niobium; C009495:titanium dioxide; C023036:perfluorooctanoic acid; D014025:Titanium; D007501:Iron