【摘要】 为探明Fenton处理对氯酚(4-CP)过程中Fe2+再生的途径,考察了反应过程Fe2+的浓度变化,同时对4-CP降解中间产物和Fe3+之间的氧化还原反应进行了研究.Fenton氧化对氯酚过程中Fe2+的浓度基本不变;而在·OH捕获剂丙醇的存在下,反应开始后1minFe2+的浓度急剧下降到10%.研究结果表明:H2O2、·OH、HO2·与O2-·等自由基对Fe2+的再生净贡献较小,4-CP降解的中间产物对Fe3+的还原是Fe2+再生的主要途径.Fenton处理4-CP产生的中间产物有对苯二酚和对苯醌.对苯二酚能够快速还原Fe3+,使Fe2+得到再生;而对苯醌还原Fe3+的作用很微弱.这一研究有助于更好地了解Fenton氧化过程中Fe2+的再生.更多还原

【Abstract】 To understand the pathways of Fe2+ regeneration du ring the Fenton oxidation of p-chlorophenol（4-CP）, the change of the conce ntration of Fe2+ and the reduction of Fe3+ by the intermediates were studied.Fe2+ remained almost unchanged during the oxidation of 4-CP by t he Fenton process.But in the presence of 1-propanol,the scavenger of ·OH, Fe 2+ sharply decreased to 10% at the end of the first minute. Analysis of the rate constants of Fe2+ and Fe3+ with H₂O₂, ·OH, HO₂· and O -_<sub>2· suggested that the net contribution of these radicals to Fe2+ regeneration was small and the reduction of Fe3+ by the intermediates o f 4-CP oxidation was the main pathway of Fe2+ regeneration. Hydroquinone and benzoquinone were identified as the intermediates by HPLC. Hydroquinone cou ld reduce Fe3+ quickly but benzoquinone could hardly reduce Fe3+.Hyd roquinone was oxidized to form benzoquinone by Fe3+ and the ratio of hydro quinone to Fe3+ was 1∶2.This study is helpful to better understand the re generation of Fe2+ in the Fenton process.更多还原