A low-energy photo-Fenton process was carried out in this study to investigate the effect of pH, temperature, Fe2+ and H2O2 dosages on the decolorization of Rhodamine B dyeing wastewater. Experimental results indicated that the decolorization efficiency of Rhodamine B by UV light illumination only and UV/H2O2 (H2O2 of 30 to 90 mg/L) were insufficient. Decolorization efficiency was remarkably enhanced to more than 83% by the photo-Fenton process at pH 5.5 and the rate constants obtained by the pseudo first-order kinetic model were in the range of 13.6-14.7?10-3 min-1. The optimal reaction condition was found at pH 3, H2O2 30 mg/L, Fe2+ 8 mg/L and 30oC leading to the 98.3% decolorized efficiency of Rhodamine B. In conclusion, the photo-Fenton process can effectively decolorize the Rhodamine B in short reaction time under proper condition. However, additional H2O2 and Fe2+ dosages and the reaction temperature up to 30oC were worthless to enhance the decolorization of Rhodamine B.
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Author Name: Y. S. Ma, C. N. Chang, C. R. Chao
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Keywords: Decolorization, Photo-Fenton Process, Pseudo First-order Kinetic, Rate Constants, Rhodamine B
ISSN: 2324-6995
EISSN: 2324-7029
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