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Abstract
The bromamine acid (BA) removal is investigated in the electro-Fenton and Fenton systems. The BA is an important dye intermediate with difficult biodegradation. So removing BA with advanced oxidation processes may provide common information on anthraquinone dye wastewater treatment. BA has a typical quinonoid structure. It means that the degradation of BA may be coupled with a series of quinone–hydroquinone conversion reactions in these two systems. As a result, two distinct degradation processes for BA are shown in the electro-Fenton and Fenton systems. For a Fenton system, the BA degradation is divided into two phases: the BA quickly transforms into a hydroquinone structure (BAH) in the first few minutes probably due to the formation of a ternary HQ–Fe–H2O2 complex, and then the BAH is oxidized by the •OH; While, in the electro-Fenton system, the BAH is not accumulated during its degradation. Fenton reaction is the main reaction in the electro-Fenton system.
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