Adsorption and aggregation of Fe(III)-hydroxy complexes during the photodegradation of phenol using the
Mst Shamsun Nahar1, Kiyoshi Hasegawa, Shigehiro Kagaya
1Department of Chemical and Biochemical Engineering, University of Toyama, 3190 Gofuku, Toyama 930-8555, Japan. msnahar@yahoo.com
Abstract:
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.
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