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  • 1 Department of Chemical and Materials Engineering, National Kaohsiung University of Applied Sciences, 415 Chien Kung Road, Kaohsiung, Taiwan
  • | 2 Department of Civil and Environmental Engineering, University of Utah, 122 South Central Campus Dr., 104 CME, Salt Lake City, UT, USA, hong@civil.utah.edu
  • | 3 Department of Environmental Engineering, Da-Yeh University, 112, Shan-Jiau Road, Da-Tsuen, Chang-Hua, Taiwan, noodle623@hotmail.com
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Abstract

This study utilized Fenton, Fenton-like, photo-Fenton, photo-Fenton-like, sono-Fenton, and sono-Fenton-like systems for the decolorization of Reactive Red 2 (RR2) dye. Fe2+ and Fe3+ were used to catalyze the actions of oxidants H2O2 and Na2S2O8. Pseudo-first order rate constants (k) were obtained by fitting the decolorization kinetics of RR2. With added oxidant at 0.3 mM and iron ion at 0.03 mM, the k values of H2O2/Fe2+, H2O2/Fe3+, Na2S2O8/Fe2+, and Na2S2O8/Fe3+ were 13, 0.67, 6.2, and 0.080 r−1, in order. Higher oxidant and iron concentrations resulted in faster decolorization in Fenton and Fenton-like systems. Additionally, decolorization was accelerated by ultraviolet (UV) and ultrasound (US) irradiation. When ethanol was used as a scavenger for the generated hydroxyl and sulfate radicals, it significantly inhibited the decolorization process in photo-Fenton and photo-Fenton-like systems. The k values obtained for the UV/H2O2/Fe2+, UV/Na2S2O8/Fe2+, UV/H2O2/Fe2+/C2H5OH, and UV/Na2S2O8/Fe2+/C2H5OH systems were 23, 14, 0.36, and 0.69 h−1, in order.

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