模拟太阳光条件下草酸钠-Fenton试剂降解苯酚

Degradation of Phenol by Sodium Oxalate-Fenton Reagent under Simulated Sunlight

采用氙灯模拟自然条件下的太阳光,研究了苯酚在草酸钠-Fenton反应体系作用下的降解规律.对光源、H2O2、C2O42-、Fe2+的初始浓度以及pH值对苯酚的去除率的影响进行了探讨.结果表明,C2O42-能有效强化Fenton试剂对苯酚的作用,在初始pH值为4、过氧化氢浓度为0.735 1 mmol/L、草酸钠浓度为0.074 63 mmol/L、亚铁离子浓度为0.053 6 mmol/L时,溶液中0.595 2 mmol/L苯酚在90 m in的降解率可达76.5%,其降解过程符合一级动力学方程.GC-MS分析表明,苯酚降解的中间产物主要为苯醌和有机酸.

Degradation of phenol irradiated with a xenon lamp was studied in the presence of sodium oxalate- Fenton reagent. Effects of light, the initial concentrations of H2O2, C2O4^2- , Fe^2＋ and pH value on the reactions were investigated. The result shows that C2O4^2- can effectively intensify the effect of the Fenton reagent, and under the following conditions, that is, pH =4.0, c（H2O2） =0.735 1 mmoL/L, c（Na2C2O4） = 0.074 63 mmol/L, c（Fe^2＋） =0.053 6 mmol/L, the degradation rate of phenol with a mass concentration of 0. 595 2 mmol/L was 76.5% under simulated sunlight irradiation for 90 min and the degradation course obeyed the one order kinetic equation. The main intermediates were also identified by GC-MS, and they were organic acid and benzoquinone.