caa a22 4500 445388560 CHVBK 20180317143039.0 cr unu---uuuuu 170323e20111201xx s 000 0 eng 10.1007/s11144-011-0346-8 doi (NATIONALLICENCE)springer-10.1007/s11144-011-0346-8 Decolorization of C.I. reactive red 198 in UV/oxidant and UV/TiO2/oxidant systems [Elektronische Daten] [Ming-Ching Wu, Chung-Hsin Wu] In this study, UV/oxidant and UV/TiO2/oxidant systems were employed to treat textile wastewater. The parent compound was C.I. reactive red 198 (RR198). The selected oxidants were H2O2, Na2S2O8, NaBrO3, and NaIO4. The effects of oxidant dosage (1-24mM), wavelength of UV (254 and 365nm) and radical scavenger addition (C2H5OH) were determined in UV/oxidant systems. The experimental results revealed that all oxidants effectively decolorized RR198 under 254nm irradiation; however, only Na2S2O8 and NaIO4 can decolorize RR198 under 365nm irradiation. The decolorization rates fit a pseudo-first order reaction model. Under 254nm irradiation and 6mM oxidant addition, the decolorization rate constants (k) of H2O2, Na2S2O8, NaBrO3, and NaIO4 for RR198 were 10.24, 17.93, 13.37, and 11.90h−1. Under 365nm irradiation, 1g/L TiO2 and 1mM NaIO4 addition, the k values of the UV/TiO2, UV/NaIO4, and UV/TiO2/NaIO4 systems were 0.50, 0.52, and 11.67h−1. The inhibition of RR198 decolorization by the addition ethanol indicates that the primary decolorization pathway involves hydroxyl radicals in UV/H2O2 and UV/Na2S2O8 systems, and that oxidation by other radicals is probably important in UV/NaBrO3 and UV/NaIO4 systems. Akadémiai Kiadó, Budapest, Hungary, 2011 Decolorization nationallicence TiO2 nationallicence H2O2 nationallicence Na2S2O8 nationallicence NaBrO3 nationallicence NaIO4 nationallicence Wu Ming-Ching Department of Technology Management, The Open University of Kaohsiung, 436 Daye North Road, Kaohsiung, Taiwan aut Wu Chung-Hsin Department of Chemical and Materials Engineering, National Kaohsiung University of Applied Sciences, 415 Chien Kung Road, Kaohsiung, Taiwan aut Reaction Kinetics, Mechanisms and Catalysis Springer Netherlands 104/2(2011-12-01), 281-290 1878-5190 104:2<281 2011 104 11144 https://doi.org/10.1007/s11144-011-0346-8 text/html Onlinezugriff via DOI 1 research-article jats NATIONALLICENCE 856 40 https://doi.org/10.1007/s11144-011-0346-8 text/html Onlinezugriff via DOI NATIONALLICENCE 700 1- Wu Ming-Ching Department of Technology Management, The Open University of Kaohsiung, 436 Daye North Road, Kaohsiung, Taiwan aut NATIONALLICENCE 700 1- Wu Chung-Hsin Department of Chemical and Materials Engineering, National Kaohsiung University of Applied Sciences, 415 Chien Kung Road, Kaohsiung, Taiwan aut NATIONALLICENCE 773 0- Reaction Kinetics, Mechanisms and Catalysis Springer Netherlands 104/2(2011-12-01), 281-290 1878-5190 104:2<281 2011 104 11144 Metadata rights reserved Springer special CC-BY-NC licence nationallicence BK010053 XK010053 XK010000 NATIONALLICENCE NATIONALLICENCE NL-springer