Degradation of Reactive Yellow 86 with photo-Fenton process drivenby solar light
Hideyuki Katsumata , Syunya Koike , Satoshi Kaneco , Tohru Suzuki , Kiyohisa Ohta
DOI:
Received September 11, 2009,Revised December 18, 2009, Accepted , Available online
Volume 22,2010,Pages 1455-1461
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The decolorization of Reactive Yellow 86 (RY 86), one of reactive azo dyes, was investigated in the presence of Fenton reagent under
solar light irradiation. The decolorization rate was strongly influenced by pH, initial concentrations of H2O2 and Fe(II), and so on. An
initial concentration of 40 mg/L was decolored more than 90% after 20 min under optimum conditions. The activation energy of the
solar photo-Fenton reaction was 1.50 kJ/mol for RY 86 in the temperature range of 10–60°C. In the kinetic study, the rate constant
of RY 86 with OH radicals could be estimated to be 1.7 1010 L/(mol sec). The decolorization e ciency of RY 86 under solar light
irradiation was comparable to the artificial light irradiation. The decrease of TOC as a result of mineralization of RY 86 was observed
during photo-Fenton process. The rate of RY 86 mineralization was about 83% under UV irradiation after 24 hr. The formation of
chloride, sulfate, nitrate and ammonium ions as end-products was observed during the photocatalytic process. The decomposition of
RY 86 gave two kinds of intermediate products. The degradation mechanism of RY 86 was proposed on the base of the identified
intermediates.
