Fe(II)活化O2高级氧化降解罗丹明B染料

基于传统Fenton体系中H₂O₂利用率低，修复费用高，对环境副作用大的缺点，通过向溶液中投加三聚磷酸钠（STPP），形成Fe（Ⅱ）-STPP配合物，氧气替代H₂O₂作为氧化剂，构建Fe（Ⅱ）/O₂/STPP的新型高级氧化体系，研究了该反应体系对模拟罗丹明B染料废水的降解性能.结果表明该体系对于罗丹明B具有良好的降解效果，并且在较广泛pH值（5-9）条件下罗丹明B降解率均在70%以上，废水中常见金属阳离子对降解效果基本没有影响.通过自由基掩蔽实验证明体系中对罗丹明B起降解作用的主要是·OH.该新型高级氧化体系更加绿色、可持续，在难降解染料等废水的处理中具有广泛的应用前景.

Study on degradation of rhodamine B by advanced oxidation based on O2 activation by Fe(II)

Traditional Fenton system has the disadvantages of low H₂O₂ utilization efficiency, high remediation cost and great environmental side effect. A new type of advanced oxidation system Fe(Ⅱ)/O₂/sodium tripolyphosphate (STPP) was proposed to ease these disadvantages. Oxygen gas was used,as the oxidant to replace H₂O₂.STPP, an inorganic ligand, has the ability to form complexation with Fe(Ⅱ), which could greatly activates O₂ to form reactive oxygen species. This studyinvestigated the degradation rhodamine B decreased by > 70%at pH between 5~9. No remarkable effect was observed on the degradation of rhodamine B by common metal ions. The results of scavenger experiments show that×OH was the main reactive oxygen species for contaminant degradation. This new reaction system is more green sustainable, and has a wide application prospect in refractory wastewater treatment.