Adsorption and aggregation of Fe(III)-hydroxy complexes during the photodegradation of phenol using the iron-added-TiO(2) combined system.
The behavior of Fe(III) aquacomplexes in TiO(2) suspensions in the degradation of phenol has been investigated. The most active Fe(OH)(2+) species adsorbed on the surface of TiO(2) retards the conversion of Fe(OH)(2+) into oligomers and therefore increases the percentage of Fe(OH)(2+) with irradiation time, with a consequent enhancement in the catalytic cycle of Fe(III)/Fe(II) and excited charge traps by Fe(III) in the iron-TiO(2) system. The influence of iron addition on TiO(2) was obtained when the regeneration of [Fe(OH)(2+)] remained continuous with irradiation time. In an optimum TiO(2) suspension (0.5g/L) with the addition of 0.1mM Fe(III), the measured k(obs) values for phenol degradation were enhanced for the higher adsorption of Fe(OH)(2+) on the reactive surface of TiO(2) at a specified irradiation time.
Department of Chemical and Biochemical Engineering, University of Toyama, 3190 Gofuku, Toyama 930-8555, Japan. msnahar@yahoo.com
Mst Shamsun
MS
Nahar
Kiyoshi
K
Hasegawa
Shigehiro
S
Kagaya
Shigeyasu
S
Kuroda
D000327:Adsorption; D002384:Catalysis; D005290:Ferric Compounds / Q000032:analysis*; D017665:Hydroxyl Radical; D007501:Iron / Q000737:chemistry*; D008027:Light; D016877:Oxidants; D010636:Phenols / Q000737:chemistry* / Q000528:radiation effects*; D010777:Photochemistry; D013056:Spectrophotometry, Ultraviolet; D014025:Titanium / Q000032:analysis*
D005290:Ferric Compounds; D016877:Oxidants; D010636:Phenols; C009495:titanium dioxide; C021024:ferric hydroxide; D017665:Hydroxyl Radical; D014025:Titanium; D007501:Iron