Abstract :
Among advanced oxidation processes (AOP), the photochemically enhanced Fenton reaction (photo-Fenton) may
be particularly effective for the treatment of industrial waste water, and the possibility to use solar light is an additional
advantage of this process. In the present work, a Fe3þ-exchanged zeolite Y was tested as a heterogeneous photo-Fenton
catalyst for the degradation of the model organic pollutant, 2,4-xylidine. The performance of the catalyst was investigated
using a bench photochemical reactor as well as solar reactors. The incident solar radiant powers (determined by
ferrioxalate actinometry) showed linear correlations with the outputs of a Si-photodiode and a bolometer mounted on
the solar unit, and could therefore be easily estimated from the on-line observation of the sensor outputs. The
experimental design methodology was used for planning the experiments under normalized conditions and for modeling
the rates of 2,4-xylidine oxidation as a function of the concentrations of the additives (Fe3þ-exchanged zeolite catalyst
and hydrogen peroxide). Although a direct quantitative comparison between both reactors is difficult (different
geometries and volumes, different spectral distribution of the radiation sources), the performance of the solar reactor
appears to compare favorably with that of the bench photochemical reactor.
2004 Published by Elsevier Ltd.
