简介:为了破坏冶炼废水中重金属有机螯合物,例如Cu-EDTA配离子废水,研究一种破络并预处理的新方法。该方法基于铁碳微电解反应原理,.OH在酸性有氧气存在的条件下产生,并在铁碳表面攻击吸附的有机基团导致螯合物的破坏,从而使铜离子将从有机物中剥离下来,然而EDTA将被.OH降解。研究pH值、温度、微电解反应时间、Fe/C质量比对铜离子脱除率及总有机碳(TOC)残余含量的影响,通过扫描电子显微镜分析(SEM)、能谱分析(EDS)、红外光谱分析(FTIR)研究处理前、后样品的表面官能团变化及形貌推断铁碳微电解反应的机理。并进行工业条件优化,得到最佳工艺条件:pH值为2,温度为常温,Fe/C质量比≥0.02,时间为60min,有氧气存在。在该条件下TOC浓度为200mg/L、铜离子浓度为60mg/L的废水反应完成后TOC和Cu残余浓度分别减低到40.66和1.718mg/L;羟基自由基降解反应机理合理解释了该实验现象。
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