氧基氯化铁非均相活化过一硫酸盐降解金橙Ⅱ

采用部分热分解法制备了氧基氯化铁（FeOCl），用于活化过一硫酸盐（PMS）降解难降解偶氮染料金橙Ⅱ（AO7）.利用X射线光电子能谱分析（XPS）、扫描电镜（SEM）和X射线衍射光谱（XRD）对其进行了表征；通过实验评估FeOCl/PMS体系对AO7的降解效果并分析了影响AO7去除率的各种因素.结果表明：FeOCl活化PMS降解AO7效果良好，矿化率达44%.在中性条件下，当FeOCl投加量50mg/L、PMS浓度1.0mmol/L、AO7浓度0.05mmol/L时，AO7可在30min内完全降解.随PMS投加量、FeOCl投加量、Cl^-浓度和反应初始pH值的增大，AO7的脱色效果提高.FeOCl还具有良好的重复利用性.此外，通过自由基淬灭实验、EPR测试和XPS分析了反应的主要活性物种和反应机理：由PMS活化产生的SO₄^-·和·OH对污染物进行降解，其中主要活性物种为SO₄^-·.

Degradation of AO7 by PMS activated by FeOCl

FeOCl was prepared by the partial thermal decomposition method, and then used to activate PMS to degrade refractory azo dye AO7.The synthesized FeOCl was characterized by XPS, SEM and XRD.The degradation of AO7 was evaluated in the FeOCl/PMS system, and various factors affecting the removal rate of AO7 was investigated. The results showed that AO7 was rapidly degraded in the FeOCl/PMS system, and mineralization rate has reached to 44%. AO7 could be completely degraded in 30min at neutral condition with 50mg/L FeOCl, 1.0mmol/L PMS and 0.05mmol/L AO7. The decolorization of AO7 increased with the increase of PMS concentration, FeOCl dosage, Cl^- concentration and the initial pH. FeOCl also exhibited a fine reusability. The main active species and reaction mechanism were verified by the radical quenching experiment, EPR test and XPS analysis. The SO₄^-· and ·OH produced by the activation of PMS contributed to the degradation of pollutants, and SO₄^-· played the dominant role.