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A Comparative Study of Ozonation, Homogeneous Catalytic Ozonation, and Photocatalytic Ozonation for C.I. Reactive Red 194 Azo Dye Degradation
Author(s) -
Yıldırım A. Özlem,
Gül Şermin,
Eren Orkide,
Kuşvuran Erdal
Publication year - 2011
Publication title -
clean – soil, air, water
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.444
H-Index - 66
eISSN - 1863-0669
pISSN - 1863-0650
DOI - 10.1002/clen.201000192
Subject(s) - mineralization (soil science) , catalysis , chemistry , photocatalysis , homogeneous , degradation (telecommunications) , nuclear chemistry , reactive dye , inorganic chemistry , photochemistry , organic chemistry , telecommunications , physics , dyeing , computer science , nitrogen , thermodynamics
In this study, the decolorization, dearomatization, and mineralization efficiencies of different advanced oxidation processes (AOPs; namely O 3 , O 3 /Fe(II), O 3 /Fe(II)/UVA, and O 3 /TiO 2 /UVA) were investigated for the azo dye C.I. Reactive Red 194 (RR194). The effects of pH (3–11), amount of TiO 2 (0.05–1 g/L), and concentration of Fe(II) (0.1–1.6 mM) were investigated for the applied methods. The decolorization and mineralization efficiencies of the photocatalytic ozonation system (O 3 /TiO 2 /UVA) were increased by decreasing the pH of the dye solution in contrast to the ozonation system (O 3 ). Decolorization of RR194 was increased in the photocatalytic ozonation system with an increasing amount of catalyst however, a decreasing was occurred for the homogeneous catalytic system (O 3 /Fe(II)) when increasing the concentration of catalyst. The decolorization efficiency of the homogeneous catalytic system (O 3 /Fe(II)) was enhanced when combined with UVA light. In our study, the most efficient method for dearomatization and mineralization was the O 3 /TiO 2 /UVA among the applied AOPs.