2,4-二氯苯氧乙酸臭氧化过程中过氧化氢的生成
CIESC Journal
• 能源和环境工程 • 上一篇 下一篇
陈岚;权宇珩
华北电力大学环境学院,河北 保定 071003
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Formation of hydrogen peroxide during ozonation of 2,4-dichlorophenoxyacetic acid in aqueous solution
CHEN Lan;QUAN Yuheng
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Abstract:
The method of degradation of 2,4-dichlorophenoxyacetic acid by ozonation in a cylindrical bubbling tower reactor was proposed.It was revealed that hydrogen peroxide was detected during the ozonation of 2,4-dichlorophenoxyacetic acid.Hydrogen peroxide is useful to decompose ozone in aqueous solution to form hydroxyl radicals.Therefore,hydrogen peroxide has an effect on the 2,4-dichlorophenoxyacetic acid degradation.In order to understand the formation of hydrogen peroxide during ozonation of 2,4-dichlorophenoxyacetic acid,the effect of various experimental parameters on the concentration of hydrogen peroxide was investigated.The experimental results showed that the formation of hydrogen peroxide depended on 2,4-dichlorophenoxyacetic acid in aqueous solution.The yield of hydrogen peroxide produced by ozone decomposition was relatively small and could be neglected.The reaction of H2O2 decay simultaneously took place in reaction solution with the reaction of H2O2 formation.The change of concentration of hydrogen peroxide in aqueous solution indicated an accumulation phase and a consumption phase.As the pH level decreased,the formation rate of hydrogen peroxide also decreased.On the other hand,with the increase of pH level,the decay rate of hydrogen peroxide increased.It is shown that hydrogen peroxide was mainly formed by the direct oxidation of ozone molecule with 2,4-dichlorophenoxyacetic acid.The decay of hydrogen peroxide was induced by the excess hydroxyl radical in aqueous solution.
陈岚;权宇珩.
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