零价铁活化过硫酸铵氧化降解苯酚的研究

Research on the oxidation degradation of phenol by activating ammonium persulfate with zero-valent iron

利用零价铁活化过硫酸铵产生硫酸根自由基降解苯酚,研究了pH、铁粉投加量、过硫酸铵浓度对苯酚降解率的影响。结果表明:在零价铁/过硫酸铵体系中,当苯酚初始浓度为0.2 mmol/L、过硫酸铵浓度为2.0 mmol/L、零价铁加入量为0.24 g/L、pH=2.8、温度为20℃、反应75 min后,苯酚去除率可达到95.1%;分子探针实验证实零价铁活化过硫酸铵降解苯酚是硫酸根自由基参与的氧化反应。

Zero-valent iron has been used for activating ammonium persulfate, producing sulphate radical in order to degrade phenol. The effects of pH,dosage of iron powder,and the concentration of ammonium persulfate on the degradation rate of phenol are studied. The results show that in zero-valent iron/ammonium persulfate systems,the phenol removing rate can reach 95.1% ,when the initial concentration of phenol is 0.2 mmol/L, concentration of ammonium persulfate 2.0 mmol/L,zero-valent iron dosage 0.24 g/L,pH 2.8, temperature 20 ℃, and reaction time 75 min. Molecular probe experiments indicate that the process of the degradation of phenol by activating ammonium persulfate with zero-valent iron is an oxidation reaction participated by sulphate radical.