Abstract: The affecting factors on phenol removal by Fe(Ⅱ)-EDTA/K2S2O8 process were studied，and the oxidation mechanism and reaction kinetics were analyzed. The results showed that the forms of iron ion and oxidant，the addition of chelant and ultraviolet have obviously effect on the oxidation of phenol. When EDTA dosage was 0.5 mmol/L，Fe(Ⅱ)dosage was 1.0 mmol/L，K2S2O4 dosage was 2.0 mmol/L，and initial pH values was 7.0，the phenol（C0=100 mg/L）degradation rate reached 71.48% at 60 ℃ for 60 min by Fe(Ⅱ)-EDTA/K2S2O8 process，under the same condition，ultraviolet radiation could increase the degradation rate to 89.38%. Mechanism and kinetics analysis showed that phenol was mainly degraded through the complex reaction with Fe4+ in Fe(Ⅱ)-EDTA/K2S2O8 process.

Key words: EDTA, Fe(Ⅱ), potassium persulfate, reaction kinetics

摘要： 考察了Fe(Ⅱ)-EDTA/K2S2O8体系降解苯酚的影响因素，并对体系中苯酚的降解机理和反应动力学进行了初步分析。结果表明，铁离子、氧化剂形态以及紫外光辐照、螯合剂的存在对氧化体系作用效果影响显著。EDTA剂量为0.5 mmol/L、Fe(Ⅱ)剂量为1.0 mmol/L、K2S2O8剂量为2.0 mmol/L、溶液初始pH值为7.0、温度为60 ℃的条件下反应60 min，浓度为100 mg/L的苯酚降解率为71.48%，同样条件下紫外光辐照时降解率可达89.38%。降解机理与动力学分析表明，苯酚在Fe(Ⅱ)-EDTA/K2S2O8体系中降解途径以与Fe4+络合降解为主。

关键词: 乙二胺四乙酸二钠, Fe(Ⅱ), K2S2O8, 反应动力学