Degradation of organic pollutants by photo/electro-Fenton sacrificial anode system
- Received Date: 09/12/2009
- Accepted Date: 24/10/2009
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Key words:
- photo/electro-Fenton /
- visible light /
- hydroxyl radical /
- orange Ⅱ
Abstract: In this study, the degradation of organic pollutants (i.e. orange Ⅱ and 2,4-dichiprophenol (2,4-DCP)) was studied by sacrificial anode Fenton reaction, employing iron as anode and graphite as cathode under the irradiation of visible light (λ＞450 nm) and the addition of electricity. The results showed that the optimum conditions for the degradation of orange Ⅱ were additional voltage of 3 V, pH value of 3.0, and hydrogen peroxide concentration of 5×10-5 mol/L. Under these conditions, the mineralized rate for orange Ⅱ was 78% in 10 hours, and the degradation rate for 2,4-DCP was 91.4% in 210 min.In order to investigate the degradation mechanism of the target compound, the electrochemical characteristics of the electrode were determined by in situ cyclic voltammetry, and the variations of hydrogen peroxide and hydroxyl radical during the degradation were traced by enzyme catalysis method and fluorescence spectrometry. The results showed that the degradation process mainly involved hydroxyl radical course.
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