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Decolorization of reactive blue 171 dye using ozonation and UV/H 2 O 2 and elucidation of the degradation mechanism
Author(s) -
Patil Namata N.,
Shukla Sanjeev R.
Publication year - 2015
Publication title -
environmental progress and sustainable energy
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.495
H-Index - 66
eISSN - 1944-7450
pISSN - 1944-7442
DOI - 10.1002/ep.12171
Subject(s) - chemistry , ozone , degradation (telecommunications) , benzene , nuclear chemistry , mineralization (soil science) , reactive dye , fourier transform infrared spectroscopy , environmental chemistry , photochemistry , organic chemistry , chemical engineering , dyeing , telecommunications , computer science , engineering , nitrogen
In this report, the degradation of a commercially important dye C. I. Reactive Blue 171 (RB 171) has been investigated using peroxidation under UV light and ozone. The effect of operational conditions such as the dye concentration, operating pH and use of the oxidants such as ozone and UV/H 2 O 2 was studied. Complete decolorization of RB 171 (50 mg/L) was obtained using ozonation, while UV/H 2 O 2 showed poor decolorization efficiency. The COD removal by ozone was fair enough at 33%, whereas with UV/H 2 O 2 it was lower than 2%. Characterization using TLC, FTIR and HPLC indicated degradation of the organic bonds of the dye. To the best of our knowledge, for the first time a possible fate of metabolism of intact dye molecule by ozone has been proposed using GC/MS analysis, which showed the production of benzene and aliphatic/aromatic sulfonate derivatives. Phytotoxicity studies revealed extensive reduction in toxicity of RB 171 with ozone. It may be concluded that the ozonation is a promising way of rapid decolorization along with effective mineralization. © 2015 American Institute of Chemical Engineers Environ Prog, 34: 1652–1661, 2015