Fe0 catalyzed photo-Fenton process to detoxify the biodegraded products of azo dye Mordant Yellow 10. (June 2018)

• Record Type: Journal Article
• Authors: Brindha, R.; Muthuselvam, P.; Senthilkumar, S.; Rajaguru, P.
• Is Part Of: Chemosphere. Volume 201(2018)
• Page Start: 77
• Page End: 95
• Publication Date: 2018-06
• Subjects: Fe catalyst -- Detoxification -- Photo-Fenton -- Degradation -- Azo dye; Pollution -- Periodicals; Pollution -- Physiological effect -- Periodicals; Environmental sciences -- Periodicals; Atmospheric chemistry -- Periodicals; 551.511
• DOI: 10.1016/j.chemosphere.2018.02.151
• Languages: English
• ISSNs: 0045-6535

Abstract

Abstract: Inspired by the efficiency of the photo-Fenton process on oxidation of organic pollutants, we herein present the feasibility of visible light driven photo-Fenton process as a post treatment of biological method for the effective degradation and detoxification of monoazo dye Mordant Yellow 10 (MY10). Anaerobic degradation of MY10 by Pseudomonas aeroginosa formed aromatic amines which were further degraded in the subsequent Fe catalyzed photo-Fenton process carried out at pH 3.0, with iron shavings and H2 O2 under blue LED light illumination. LC-MS and stoichiometric analysis confirmed that reductive azo bond cleavage was the major reaction in anaerobic bacterial degradation of MY10 producing 4-amino benzene sulfonic acid (4-ABS) and 5-amino salicylic acid (5-ASA) which were further degraded into hydroxyl amines, nitroso and di/tri carboxylic acids by the photo-Fenton process. Toxicity studies with human small cell lung cancer A549 cells provide evidence that incorporation of Fe 0 catalyzed photo-Fenton step after anaerobic bacterial treatment improved the mineralization and detoxification of MY10 dye. Graphical abstract: Image 1 Highlights: Fe 0 catalyzed photo-Fenton approach was employed as secondary treatment for azo dye degradation. Monoazo dye MY10 was degraded into aromatic amines in primary anaerobic bacterial treatment. Aromatic amines were mineralized in photo-Fenton oxidation. Plausible degradation routes of the integrated sequential approach were elucidated. Detoxification efficiency of Fe 0 catalyzed photo-Fenton approach was revealed.