Degradation of tetrabromobisphenol A and toxicity controlling by ferrate(VI) oxidizing technology

Abstract:

The work is to investigate the degradation of TBBPA and its toxicity controlling by ferrate(Ⅵ) oxidizing technology. The effects of oxidant dosage and solution pH on TBBPA degradation was evaluated through the beaker tests. The variation and controlling of the acute and chronic toxicity was investigated, and the possible degradation mechanism was proposed. The results of the experiments showed that, TBBPA could be effectively degraded by ferrate(Ⅵ) oxidation. When the concentrations of ferrate(Ⅵ) and TBBPA were both 0.15 mg/L, TBBPA could be thoroughly degraded under different pH (6.0-9.0) conditions. The acute and chronic toxicity of water samples, enhanced at the initial reaction stage due to the accumulation of more toxic organic intermediates, could be impressively controlled by ferrate(Ⅵ) oxidizing technology with the prolonging of the reaction time. The optimum pH was 8.0, under which condition the acute and chronic toxicity were decreased to 0.02 TU and 10.5 TU respectively. The analysis of mechanism showed that the degradation pathway of TBBPA mainly included the addition reaction, the beta scission, the deprotonating reaction and the debromination reaction.