Abstract
The heterogeneous catalytic degradation of a model azo dye, acid red 1 (AR1), initiated by zero valent iron nanoparticles (ZVINP), and its synergic effect with ultrasound (US) have been investigated in the present study. The treatment of AR1 using ZVINP at pH 3 showed maximum efficiency in terms of colour removal (53.0%) and mineralization (48.5% TOC reduction) after 25 min of reaction. However, the coupling of this system with US showed an enhanced efficiency against the decolourization and mineralization of AR1. More than 95% colour removal was achieved within 5 min in the case of US/ZVINP system. Around 55% TOC reduction suggests the conversion of the parent molecules in to aromatic transformed products, and it is further supported by LC-Q-TOF analysis. The remarkably higher efficiency in the coupled system is attributed to the synergic effect of ZVINPs and ultrasound. The highest degradation rates observed at highly acidic (pH 3) and alkaline pH (pH 9) suggests that different mechanisms are operating at both pH. The products identified gave some insight into the mechanism. The ZVINPs prepared in the present study was easily recoverable (and reusable) and hence may be considered as an effective replacement for the conventional Fenton’s reagent.
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Acknowledgements
Shoniya Thomas is thankful to the Council of Scientific and Industrial Research (CSIR), New Delhi, India, for financial support. C.T. Aravindakumar is thankful to BRNS, Mumbai, KSCSTE, Thiruvanthapuram and DST (under Purse & FIST programme) for financial support.
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Thomas, S., Abraham, S.V., Aravind, U.K. et al. Enhanced degradation of acid red 1 dye using a coupled system of zero valent iron nanoparticles and sonolysis. Environ Sci Pollut Res 24, 24533–24544 (2017). https://doi.org/10.1007/s11356-017-0080-5
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DOI: https://doi.org/10.1007/s11356-017-0080-5