Mechanistic studies of photoinduced degradation of Orange G using LC/MS (original) (raw)

RSC Advances, 2011

Abstract

ABSTRACT Photocatalytic degradation of Orange G dye was carried out with UV light in the presence of TiO2 mixed with 20% chromium oxide as a catalyst. The conditions for maximum dyedegradation were optimized in terms of catalyst amount, dye concentration, pH and time. The dyedegradation followed pseudo first-order kinetics. LC-MS/MS was used to track the numerous intermediate products formed during the course of dyedegradation. Major intermediate products confirmed were substituted phenols, aromatic hydroxyl amine, nitrosohydroxylaromatic amines and dicarboxylaromatic compounds. These intermediates along with some minor products were correlated to suggest a possible degradation pathway of Orange G. The dyedegradation occurred mainly by three pathways, namely the hydroxylation of the aromatic ring, desulfonation and oxidative cleavage of the azo bond.

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