改性零价铁降解多溴二苯醚的研究进展
Research progress on the degradation of polybrominated diphenyl ethers by modified zero valent iron
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摘要: 多溴二苯醚（PBDEs）是一类持久性有机污染物（POPs），其无害降解技术是一个研究热点.PBDEs的降解方法包括生物降解、光降解、电解降解、零价铁（ZVI）还原降解、Fenton试剂氧化降解等.其中，零价铁因其优良的还原性能，被逐渐应用于PBDEs等POPs的还原降解，但零价铁因比表面积小、易团聚、易氧化等缺点，需通过改性以改善其降解效果.本文重点从减小铁颗粒粒径、应用搭载系统、加入活性金属、添加表面活性剂、使用辅助手段（超声或微波等）等5个方面综述了改性零价铁降解PBDEs的研究进展，讨论了各改性方法的优缺点，介绍了卤代有机污染物脱卤产物的后续降解方法，并展望了今后的研究重点.Abstract: Green degradation of polybrominated diphenyl ethers (PBDEs), a class of persistent organic pollutants (POPs), is a research hot spot. The degradation methods of PBDEs include biodegradation, photolysis degradation, electrolysis degradation, zero valent iron (ZVI) reductive degradation and Fenton reagent oxidative degradation etc. Because of its excellent reductive capability, ZVI has been gradually applied to the reductive dehalogenation of PBDEs and other POPs. However, since there are so many weakness for the conventional ZVI, such as the limited specific surface area, easy aggregation and oxidation, modification of ZVI is needed to improve its degradation efficiency. Five modification approaches for ZVI were reviewed on the research progress of PBDEs degradation, such as reducing iron particle size, using carriers, supplementing with active metals, adding surfactants, and employing auxiliary means (ultrasound or microwave) etc. Advantages and disadvantages for each modification method were discussed. Moreover, the subsequent degradation methods of the dehalogenated products were also introduced, and perspective on the future research focus of modified ZVI were also discussed.
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Key words:
- zero valent iron /
- modification /
- polybrominated diphenyl ethers /
- degradation
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