Abstract:

The debromination effect and influencing factors of 2,4,6-TBP in UV/SO₃^2-system were examined,and the debromination process,degradation mechanism and degradation pathway of 2,4,6-TBP in reduction system were analyzed.Results showed that：the degradation effect of UV/SO₃^2-reduction system on 2,4,6-TBP was significantly higher than that of UV system alone.Na₂SO₃ concentration,pH and reaction temperature had significant effects on the degradation effect of reduction system.With the increase of Na₂SO₃ concentration,pH and reaction temperature,the degradation effect of UV/SO₃^2- system 2,4,6-TBP increased gradually.The quasi-first-order kinetic equation could describe the degradation process of the target pollutant in the reduction system at different Na₂SO₃ concentrations and reaction temperatures.The addition of hydrated electron capture agent could effectively inhibit the debromination reaction of 2,4,6-TBP.The reduction rate and bromide ion yield of the pollutants in the UV/SO₃^2- system were higher than that of the UV system alone.2,4,6-TBP was degraded into low toxicity substances by hydration electrons in the reduction system.

Key words: halogenated organic compound, 2,4,6-tribromophenol, hydrated electron, reduction system of UV/SO₃^2-