The chemical degradation of C.I. Acid Brown 349 in aqueous solution using hydrogen peroxide and sodium hypochlorite and its implications for biodegradation

The use of hydrogen peroxide and sodium hypochlorite for the oxidation of a 1 × 10−4 M aq solution of C.I. Acid Brown 349 was investigated. The influence of Fe2+ concentration ranging from 0 to 50 mg L−1 and various doses of oxidant at different pH values and temperatures was investigated. High decolorisation (∼100%) was obtained under optimal reaction conditions. A tentative mechanistic pathway for the oxidative degradation of the dye in aqueous solution is postulated; in addition, the thermal degradation of the in air was discussed.