【摘要】 为更好的了解类Fenton体系降解对氯苯酚(4-CP)过程Fe2+的来源,考察了过程中Fe2+的变化并分析了两种Fe3+还原途径.Fe2+的生成分成3个阶段:缓慢增加、快速增加和停止增加;Fe3+还原存在两种途径:H2O2的还原作用(A)和中间产物对苯二酚对Fe3+的还原(B).实验数据拟合表明Fe3+被对苯二酚还原的速率与溶液中Fe3+的浓度的平方成正比,与对苯二酚浓度成正比,反应速率常数为4.96×105(mol/L)-2.s-1.降解过程中,两种还原途径交互起作用.反应启动时,A途径起着关键作用并导致B途径的产生;降解12 min后,B途径居主导地位,20 min后,A途径的作用可忽略不计.更多还原

【Abstract】 To better understand the source of Fe²⁺ during the degradation of 4-chlorophenol（4-CP） by Fenton-like process better,change of Fe²⁺ was measured during the whole course and two reduction pathways of Fe³⁺ were analyzed.Formation of Fe²⁺ was divided into three phases: slow phase,fast phase and the phase in which no Fe²⁺ formed.Fe³⁺ is not only reduced by hydrogen peroxide（pathway A） but by the intermediate-hydroquinone（pathway B）.The experimental data showed that the reduction rate of Fe³⁺ by hydroquinone was first order to the concentration of 4-CP and second order to the concentration of Fe³⁺.The rate constant is 4.96×10⁵（mol/L）^-2·s^-1.These two pathways interact during the degradation of 4-CP.At the time when the reaction starts,pathway is very important and gives rise to pathway B.But after 12 min,pathway pathnay B becomes dominant and pathway A can be neglected after 20 min.更多还原