摘要：

选用工业生产中废弃的铁刨花作为零价铁（ZVI）供体，通过催化活化过一硫酸盐（PMS），研究其对Cu-EDTA的降解破络特性。考察了PMS初始浓度、铁刨花投加量、pH、水质离子对Cu-EDTA破络的影响。在此基础上，进一步分析了体系中的活性物质及反应后生成铁泥的特性。结果表明：当铁刨花投加量为10 g/L，PMS初始浓度为4.5 mmol/L，pH=3时，Cu的去除率达到99.64%，pH对反应无显著影响；CO₃ ^2-和Cl^-对Cu的去除呈现出一定的抑制效果，且CO₃ ^2-的抑制效果强于Cl^-，腐殖酸（HA）无显著抑制效果；自由基抑制实验结合电子顺磁共振（EPR）表征结果表明体系中同时存在SO₄ ^‧-和‧OH；反应后所生成铁泥的EPR表征结果表明，铁刨花表面被腐蚀，生成了纳米级别的铁（氢）氧化物，提高了对Cu的去除率。

关键词: 高级氧化, 铁刨花, 过一硫酸盐, Cu-EDTA

Abstract:

The iron scraps from industrial production were used as zero valent iron（ZVI） source to activate peroxymonosulfate（PMS）. The performance of Cu-EDTA degradation by iron scraps activated PMS was studied. The effects of initial PMS concentration，iron scraps doses，pH and water matrices on the breakdown of Cu-EDTA were investigated. Then，the reactive species in iron scraps/PMS system were identified and the characterization of the iron sludge generated in the reaction process was conducted. The results showed that when the dosage of iron scraps was 10 g/L，the initial PMS concentration was 4.5 mmol/L，the removal rate of Cu was 99.64% at pH=3. The pH had no significant effect on reaction. However，the CO₃ ^2- and Cl^- had some inhibition effect on Cu removal，and the inhibition effect caused by former was more obvious than the latter. HA had no obvious influence on Cu removal. Scavenger experiments combined with EPR identification confirmed that SO₄ ^·- and ·OH both existed in the system and contributed to Cu-EDTA removal. The characterization of iron sludge showed that the surface of iron scraps was corroded to generate nano scale iron（hydro）oxides，which enhanced the removal of Cu.

Key words: advanced oxidation processes, iron scraps, peroxymonosulfate, Cu-EDTA

中图分类号: 

• X703.1