Kinetics and Excitation-emission Fluorescence of Photocatalytic Degradation of Natural Organic Matters by Nitrogen-doped TiO2
This paper researches the kinetic characteristics of nitrogen-doped TiO2 with different dosage and initial concentration of humic acid (HA) when used for photocatalytic degradation of nature organic matters under visible light.The results indicate that the HA photocatalytic degradation was in line with the apparent first-order reaction kinetics.HA degrading rate was the highest when N-TiO2 concentration was 200mg/L; the removal of HA was 88.9％ after 5h radiation.Fluorescence spectroscopy was shown to be a powerful tool for monitoring of the photocatalytic degradation of nature organic matters.Peaks were blue-shifted or red-shifted along the excitation and emission axis for 5-10nm with the remarkable decreasing fluorescence intensity,with the reduction to more than 90％ after 2h.
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